# Hole Saws — B2B Industrial Specification Monograph | Newtech Sources Co., Ltd.

> Bi-metal M42 hole saws, contractor kits, high-carbon steel wood cutters, and TCT metal cutters.

## 1. Category Procurement & Engineering Summary
- **Manufacturer**: Newtech Sources Co., Ltd. (Founded 1998, Guangzhou, China · Tax ID / USCC: 914401067124673119)
- **Canonical Category Hub**: https://newtech-sources.com/products/category/hole-saws
- **Active Series in Category**: 13 published industrial product series
- **Engineering Tolerance Benchmark**: Engineered to DIN 8039 / DIN 338 / ASME B94.11M flute concentricity and shank dimensional tolerances
- **OEM / ODM Policy**: Process-by-requirement custom dimensions, alloy/bond formulation, laser marking, and private-label packaging
- **Quality Verification**: 100% Pre-Shipment Dimensional & Visual Inspection prior to dispatch
- **Port of Loading**: Flexible FOB & mixed-container consolidation from any port in China
- **Direct RFQ Endpoint**: https://newtech-sources.com/contact | Email: sales@newtech-sources.com
- **Parent Summary Index**: https://newtech-sources.com/llms.txt

## 2. Quick Comparison Matrix

| Model / SKU | Product Series | Dimensional / Key Summary | MOQ | Canonical URL |
| --- | --- | --- | --- | --- |
| NT-HLS-101 | M42 8% Cobalt Bi-Metal Variable-Pitch (4/6 TPI) Heavy-Duty Hole Saw | 22mm (7/8") to 102mm (4") (22mm (7/8"), 35mm (1-3/8"), 51mm (2"), 76mm (3"), 102mm (4")) | 100 Pcs | https://newtech-sources.com/products/m42-8-percent-cobalt-bi-metal-hole-saw-heavy-duty |
| NT-HLS-112 | TCT Tungsten Carbide Tipped Heavy-Duty Metal & Stainless Steel Hole Saw | 22mm (7/8") to 75mm (3") (22mm (7/8"), 30mm (1-3/16"), 35mm (1-3/8"), 50mm (2"), 75mm (3")) | 100 Pcs | https://newtech-sources.com/products/tct-carbide-tipped-metal-stainless-steel-hole-saw |
| NT-HLS-106 | Integrated Bi-Metal Hole Saw with Welded Hex Shank & Ejection Spring | 20mm (25/32") to 50mm (2") (20mm (25/32"), 25mm (1"), 32mm (1-1/4"), 50mm (2")) | 150 Pcs | https://newtech-sources.com/products/integrated-bi-metal-hole-saw-with-welded-hex-shank |
| NT-HLS-108 | High-Carbon Steel (HCS) Wood, Drywall & PVC Hole Saw Cutter | 51mm (2") to 127mm (5") (51mm (2"), 64mm (2-1/2"), 76mm (3"), 102mm (4"), 127mm (5")) | 300 Pcs | https://newtech-sources.com/products/high-carbon-steel-wood-drywall-hole-saw-cutter |
| NT-HLS-113 | TCT Tungsten Carbide Tipped Woodworking & Heavy Timber Hole Saw | 51mm (2") to 102mm (4") (51mm (2"), 64mm (2-1/2"), 76mm (3"), 102mm (4")) | 100 Pcs | https://newtech-sources.com/products/tct-carbide-tipped-woodworking-and-timber-hole-saw |
| NT-HLS-110 | Integrated High-Carbon Steel Hole Saw with Fixed Round Shank | 32mm (1-1/4") to 76mm (3") (32mm (1-1/4"), 51mm (2"), 64mm (2-1/2"), 76mm (3")) | 200 Pcs | https://newtech-sources.com/products/integrated-carbon-steel-woodworking-hole-saw |
| NT-HLS-109 | Industrial Hole Saw Quick-Lock Arbors, Mandrels & HSS Pilot Bits | Heavy-duty hole saw arbor mandrels featuring hardened alloy steel drive pin | 100 Pcs | https://newtech-sources.com/products/hole-saw-quick-lock-arbors-mandrels-pilot-drills |
| NT-HLS-107 | Sheet Metal Thin-Gauge Bi-Metal Hole Saw with Safety Depth Stop Collar | 20.4mm (M20 Electrical / 13/16") to 40.5mm (M40 Electrical / 1-19/32") (20.4mm (M20 Electrical / 13/16"), 25.4mm (M25 Electrical / 1"), 32.5mm (M32 Electrical / 1-9/32"), 40.5mm (M40 Electrical / 1-19/32")) | 150 Pcs | https://newtech-sources.com/products/sheet-metal-thin-gauge-bi-metal-hole-saw-with-depth-stop |
| NT-HLS-102 | 9-Piece M42 Bi-Metal Hole Saw Set for Electricians & Plumbers | 6 Saws (19–57mm) + 2 Arbors + 1 Adapter | 50 Sets | https://newtech-sources.com/products/9-piece-m42-bi-metal-hole-saw-set-electrician-plumber |
| NT-HLS-111 | Multi-Blade 7-in-1 Concentric Nest Hole Saw Cutter Set | 7 Blades (25–63mm) + Aluminum Disc Base | 200 Sets | https://newtech-sources.com/products/multi-blade-7-in-1-concentric-nest-hole-saw-cutter |
| NT-HLS-105 | 13-Piece Master M42 Bi-Metal Hole Saw Complete Industrial Case Set | 9 Saws + Complete Accessories in Industrial Case | 40 Sets | https://newtech-sources.com/products/13-piece-master-m42-bi-metal-hole-saw-case-set |
| NT-HLS-103 | 10-Piece M42 Bi-Metal Hole Saw Contractor Kit with Ejection Springs | 6 Saws (22–64mm) + Complete Accessories | 50 Sets | https://newtech-sources.com/products/10-piece-m42-bi-metal-hole-saw-contractor-kit |
| NT-HLS-104 | 12-Piece M42 Bi-Metal Hole Saw Master Technician Assortment Set | 8 Saws (19–76mm) + 2 Arbors + Spare Drill + Hex Key | 40 Sets | https://newtech-sources.com/products/12-piece-m42-bi-metal-hole-saw-master-technician-kit |

## 3. Detailed Technical Specifications (13 Series)

### 3.1 M42 8% Cobalt Bi-Metal Variable-Pitch (4/6 TPI) Heavy-Duty Hole Saw (NT-HLS-101)
- **Canonical URL**: https://newtech-sources.com/products/m42-8-percent-cobalt-bi-metal-hole-saw-heavy-duty
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/m42-8-percent-cobalt-bi-metal-hole-saw-heavy-duty.txt
- **Model / SKU**: NT-HLS-101
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 100 Pcs
- **Direct RFQ**: https://newtech-sources.com/contact?product=M42%208%25%20Cobalt%20Bi-Metal%20Variable-Pitch%20(4%2F6%20TPI)%20Heavy-Duty%20Hole%20Saw%20(NT-HLS-101)

**Overview**: Constructed with premium Matrix II M42 high-speed steel containing 8% cobalt, electron-beam welded to a tough alloy steel backing. The 4/6 variable tooth pitch delivers aggressive cutting action while dramatically dampening harmonic chatter and vibration. Features a 38mm (1-1/2") or 44mm (1-3/4") cutting depth and deep side slots for fast core slug ejection. 100% pre-shipment tested. Compatible with standard A1/A4 and A2/A10 arbor mandrels. FOB delivery from any port in China.

**Engineering Highlights**:
- M42 high-speed steel with 8% cobalt ensures prolonged edge sharpness in stainless steel
- 4/6 TPI variable tooth pitch suppresses vibration and increases cutting speed by 30%
- Solid heavy-gauge steel backing cap resists thread distortion under high feed torque
- Wide angled slug ejection slots for rapid plug removal without sticking
- Diameter range from 14mm (9/16") up to 210mm (8-1/4")

**Target Materials & Applications**: Stainless steel sheet 304/316, structural carbon steel, and pipework, Cast iron, brass, bronze, aluminum, and sheet metal fabrication, Wood, plastic composites, PVC pipes, and fiberglass panels

**Technical Specifications**:
| size | depth | model | thread |
| --- | --- | --- | --- |
| 22mm (7/8") | 38mm (1-1/2") | NT-HLS-101-022 | 1/2"-20 |
| 35mm (1-3/8") | 38mm (1-1/2") | NT-HLS-101-035 | 5/8"-18 |
| 51mm (2") | 38mm (1-1/2") | NT-HLS-101-051 | 5/8"-18 |
| 76mm (3") | 38mm (1-1/2") | NT-HLS-101-076 | 5/8"-18 |
| 102mm (4") | 38mm (1-1/2") | NT-HLS-101-102 | 5/8"-18 |

| Parameter | Specification |
| --- | --- |
| Tooth Material | M42 HSS (8% Cobalt) Electron-Beam Welded |
| Body Material | Alloy Spring Steel Backing |
| Tooth Geometry | 4/6 TPI Variable Pitch with Positive Rake |
| Cutting Depth | 38mm (1-1/2") & 44mm (1-3/4") |
| Thread Mount | 1/2"-20 (14–30mm) & 5/8"-18 (32–210mm) |

### 3.2 TCT Tungsten Carbide Tipped Heavy-Duty Metal & Stainless Steel Hole Saw (NT-HLS-112)
- **Canonical URL**: https://newtech-sources.com/products/tct-carbide-tipped-metal-stainless-steel-hole-saw
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/tct-carbide-tipped-metal-stainless-steel-hole-saw.txt
- **Model / SKU**: NT-HLS-112
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 100 Pcs
- **Direct RFQ**: https://newtech-sources.com/contact?product=TCT%20Tungsten%20Carbide%20Tipped%20Heavy-Duty%20Metal%20%26%20Stainless%20Steel%20Hole%20Saw%20(NT-HLS-112)

**Overview**: Engineered for high-volume metal fabrication where bi-metal hole saws wear out rapidly. The Triple-Chip Ground (TCG) tungsten carbide teeth slice through tough stainless steel 304/316, structural alloy plates, cast iron, and fiberglass reinforced plastics with minimal heat generation. Features a stepped cobalt center pilot drill with built-in ejection spring to expel slugs instantly upon breakthrough. 100% pre-shipment tested. Available in diameters from 14mm to 150mm. FOB delivery from any port in China.

**Engineering Highlights**:
- Micrograin tungsten carbide teeth deliver up to 10x the life of bi-metal in stainless steel
- Triple-chip tooth geometry balances cutting forces and reduces thermal buildup
- Spring-loaded stepped cobalt center drill automatically ejects metal core slugs
- Solid one-piece body with 3-flat shank prevents chuck slippage under high load
- Cuts up to 25mm (1") thick plate steel and pipes

**Target Materials & Applications**: Stainless steel tanks, pipework, and commercial kitchen fabrication, Heavy structural steel I-beams, truck chassis, and railway cars, Abrasive fiberglass reinforced plastics (FRP) and composite materials

**Technical Specifications**:
| size | model | maxDepth |
| --- | --- | --- |
| 22mm (7/8") | NT-HLS-112-022 | 25mm (1") |
| 30mm (1-3/16") | NT-HLS-112-030 | 25mm (1") |
| 35mm (1-3/8") | NT-HLS-112-035 | 25mm (1") |
| 50mm (2") | NT-HLS-112-050 | 25mm (1") |
| 75mm (3") | NT-HLS-112-075 | 25mm (1") |

| Parameter | Specification |
| --- | --- |
| Tooth Material | Micrograin Tungsten Carbide (TCT) |
| Tooth Geometry | Triple-Chip Ground (TCG) Multi-Angle Teeth |
| Max Plate Thickness | Up to 25mm (1") Steel |
| Shank | 10mm (3/8") with 3 Anti-Slip Flats |
| Diameter Range | 14mm – 150mm (9/16" – 6") |

### 3.3 Integrated Bi-Metal Hole Saw with Welded Hex Shank & Ejection Spring (NT-HLS-106)
- **Canonical URL**: https://newtech-sources.com/products/integrated-bi-metal-hole-saw-with-welded-hex-shank
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/integrated-bi-metal-hole-saw-with-welded-hex-shank.txt
- **Model / SKU**: NT-HLS-106
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 150 Pcs
- **Direct RFQ**: https://newtech-sources.com/contact?product=Integrated%20Bi-Metal%20Hole%20Saw%20with%20Welded%20Hex%20Shank%20%26%20Ejection%20Spring%20(NT-HLS-106)

**Overview**: Designed for maximum job-site speed and convenience, the integrated bi-metal hole saw eliminates the need for separate arbors, mandrels, and loose threaded parts. The heavy-duty hex shank is welded directly to the solid backing plate, guaranteeing perfect concentricity and zero arbor wobble. The built-in ejection spring automatically pushes out core slugs upon breakthrough. 100% pre-shipment tested. Available in individual blister cards or contractor sets. FOB delivery from any port in China.

**Engineering Highlights**:
- 1-piece integrated design requires no separate arbor or assembly tools
- Precision welded hex shank fits all standard 3-jaw and quick-release chucks
- Spring-loaded pilot bit automatically ejects metal and wood slugs
- Premium M3 / M42 bi-metal tooth edge for fast, clean cutting

**Target Materials & Applications**: High-speed electrical box knockouts and lighting retrofits, Sheet metal enclosure penetrations in ventilation systems, On-site plumbing installation and maintenance

**Technical Specifications**:
| size | model | shank |
| --- | --- | --- |
| 20mm (25/32") | NT-HLS-106-020 | 1/4" Hex |
| 25mm (1") | NT-HLS-106-025 | 1/4" Hex |
| 32mm (1-1/4") | NT-HLS-106-032 | 3/8" Hex |
| 50mm (2") | NT-HLS-106-050 | 3/8" Hex |

| Parameter | Specification |
| --- | --- |
| Design Type | 1-Piece Integrated Welded Shank |
| Shank | 1/4" or 3/8" Quick-Change Hex Shank |
| Tooth Material | HSS Bi-Metal with 4/6 TPI |
| Diameter Range | 16mm – 76mm (5/8" – 3") |
| Ejection Mechanism | Spring-Loaded Pilot Drill Core Ejector |

### 3.4 High-Carbon Steel (HCS) Wood, Drywall & PVC Hole Saw Cutter (NT-HLS-108)
- **Canonical URL**: https://newtech-sources.com/products/high-carbon-steel-wood-drywall-hole-saw-cutter
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/high-carbon-steel-wood-drywall-hole-saw-cutter.txt
- **Model / SKU**: NT-HLS-108
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 300 Pcs
- **Direct RFQ**: https://newtech-sources.com/contact?product=High-Carbon%20Steel%20(HCS)%20Wood%2C%20Drywall%20%26%20PVC%20Hole%20Saw%20Cutter%20(NT-HLS-108)

**Overview**: Engineered for high-efficiency, cost-effective hole cutting in interior decoration, ceiling spotlight installation, and timber framing. Induction-hardened sharp carbon steel teeth rip smoothly through plasterboard, drywall, softwoods, particleboard, and plastics without clogging. Features standard threaded base caps compatible with universal arbor mandrels. 100% pre-shipment inspected. Available in individual packaging or bulk contractor bundles. FOB delivery from any port in China.

**Engineering Highlights**:
- Induction-hardened carbon steel teeth deliver fast cuts in soft materials
- Wide gullet tooth spacing prevents sawdust buildup in resinous wood and drywall
- Standard universal threaded arbor connection
- Cost-effective solution for large-scale commercial drywall and residential jobs

**Target Materials & Applications**: Ceiling recessed can spotlight and speaker cutouts in drywall/plasterboard, Wooden furniture cable grommets and desk pass-through holes, PVC drainage piping and plastic electrical conduit penetrations

**Technical Specifications**:
| size | depth | model |
| --- | --- | --- |
| 51mm (2") | 25mm (1") | NT-HLS-108-051 |
| 64mm (2-1/2") | 25mm (1") | NT-HLS-108-064 |
| 76mm (3") | 25mm (1") | NT-HLS-108-076 |
| 102mm (4") | 25mm (1") | NT-HLS-108-102 |
| 127mm (5") | 32mm (1-1/4") | NT-HLS-108-127 |

| Parameter | Specification |
| --- | --- |
| Material Grade | 50# / 65Mn High-Carbon Steel (HCS) |
| Tooth Hardness | 52 – 56 HRC |
| Cutting Depth | 25mm (1") & 32mm (1-1/4") |
| Diameter Range | 19mm – 152mm (3/4" – 6") |

### 3.5 TCT Tungsten Carbide Tipped Woodworking & Heavy Timber Hole Saw (NT-HLS-113)
- **Canonical URL**: https://newtech-sources.com/products/tct-carbide-tipped-woodworking-and-timber-hole-saw
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/tct-carbide-tipped-woodworking-and-timber-hole-saw.txt
- **Model / SKU**: NT-HLS-113
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 100 Pcs
- **Direct RFQ**: https://newtech-sources.com/contact?product=TCT%20Tungsten%20Carbide%20Tipped%20Woodworking%20%26%20Heavy%20Timber%20Hole%20Saw%20(NT-HLS-113)

**Overview**: Engineered for timber framers, utility contractors, and remodeling professionals who encounter hard knots, abrasive glues, and nail-embedded timber. The brazed tungsten carbide teeth power through abrasive MDF, treated decking, dense hardwoods, and structural laminated beams where conventional bits instantly dull. Deep flute valleys ensure rapid chip ejection even in green or wet lumber. 100% pre-shipment tested. FOB delivery from any port in China.

**Engineering Highlights**:
- Heavy tungsten carbide teeth slice through nail-embedded wood and hard knots
- Wide-spaced gullets clear heavy wood chips rapidly without clogging
- Extended cutting depth accommodates thick timber studs and joists
- Compatible with universal 5/8"-18 threaded arbor mandrels

**Target Materials & Applications**: Timber framing, log homes, and heavy wood structural drilling, Utility pole wiring and plumbing pass-through holes in subfloors, Demolition lumber, reclaimed wood, and glue-laminated beams

**Technical Specifications**:
| size | depth | model |
| --- | --- | --- |
| 51mm (2") | 54mm (2-1/8") | NT-HLS-113-051 |
| 64mm (2-1/2") | 54mm (2-1/8") | NT-HLS-113-064 |
| 76mm (3") | 54mm (2-1/8") | NT-HLS-113-076 |
| 102mm (4") | 54mm (2-1/8") | NT-HLS-113-102 |

| Parameter | Specification |
| --- | --- |
| Tooth Material | Heavy-Duty Tungsten Carbide (TCT) |
| Cutting Depth | 50mm – 65mm (2" – 2-1/2") |
| Thread Connection | 5/8"-18 Standard Arbor Thread |
| Diameter Range | 32mm – 152mm (1-1/4" – 6") |

### 3.6 Integrated High-Carbon Steel Hole Saw with Fixed Round Shank (NT-HLS-110)
- **Canonical URL**: https://newtech-sources.com/products/integrated-carbon-steel-woodworking-hole-saw
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/integrated-carbon-steel-woodworking-hole-saw.txt
- **Model / SKU**: NT-HLS-110
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 200 Pcs
- **Direct RFQ**: https://newtech-sources.com/contact?product=Integrated%20High-Carbon%20Steel%20Hole%20Saw%20with%20Fixed%20Round%20Shank%20(NT-HLS-110)

**Overview**: A rugged, low-cost cutting solution engineered for DIY tool packages, furniture makers, and drywall installers. The fixed shank is factory-machined and pressed into the heavy carbon steel cup, ensuring rigid alignment without loose nuts or adapters. Deep chip gullets prevent pitch accumulation when boring through softwoods, particle boards, and PVC pipes. 100% pre-shipment inspected. FOB delivery from any port in China.

**Engineering Highlights**:
- Integrated 1-piece body and shank eliminates assembly complications
- Heat-treated carbon steel teeth for dependable cutting in softwoods and drywall
- Wide chip relief slots on sides for easy core plug removal
- Available in individual hanging cards or packaged master kits

**Target Materials & Applications**: Wooden furniture cable management grommet holes, Interior partition drywall and ceiling spotlight installations, PVC conduit and rainwater pipe penetrations

**Technical Specifications**:
| size | depth | model |
| --- | --- | --- |
| 32mm (1-1/4") | 25mm (1") | NT-HLS-110-032 |
| 51mm (2") | 25mm (1") | NT-HLS-110-051 |
| 64mm (2-1/2") | 25mm (1") | NT-HLS-110-064 |
| 76mm (3") | 25mm (1") | NT-HLS-110-076 |

| Parameter | Specification |
| --- | --- |
| Material | High Carbon Steel (HCS) |
| Shank | Integrated 10mm (3/8") Round Shank |
| Cutting Depth | 25mm (1") |
| Diameter Range | 25mm – 102mm (1" – 4") |

### 3.7 Industrial Hole Saw Quick-Lock Arbors, Mandrels & HSS Pilot Bits (NT-HLS-109)
- **Canonical URL**: https://newtech-sources.com/products/hole-saw-quick-lock-arbors-mandrels-pilot-drills
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/hole-saw-quick-lock-arbors-mandrels-pilot-drills.txt
- **Model / SKU**: NT-HLS-109
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 100 Pcs
- **Direct RFQ**: https://newtech-sources.com/contact?product=Industrial%20Hole%20Saw%20Quick-Lock%20Arbors%2C%20Mandrels%20%26%20HSS%20Pilot%20Bits%20(NT-HLS-109)

**Overview**: Essential accessories for all bi-metal and carbon steel hole saws. Manufactured from high-tensile 40Cr alloy steel and heat-treated for extreme torsional resistance. The small arbors (A1 / A4) fit 14mm–30mm hole saws with 1/2"-20 thread; the large arbors (A2 / A10) feature two sliding drive pins that engage directly into the hole saw back cap, transferring immense rotational torque without overtightening or seizing the thread. 100% pre-shipment inspected. FOB delivery from any port in China.

**Engineering Highlights**:
- Sliding dual drive pins absorb rotational torque, preventing arbor thread seizure
- Available in 3/8" (9.5mm) & 7/16" (11mm) hex shanks and SDS-Plus hammer shanks
- Precision-ground HSS M2 center pilot drill with 135° split point eliminates wandering
- Heavy set screw securely locks center drill against displacement during heavy cuts

**Target Materials & Applications**: Drive connection for 14mm to 210mm (9/16" to 8-1/4") hole saws, Heavy industrial drilling in structural steel, pipe flanges, and wood timbers, Contractor toolkits and replacement accessory programs

**Technical Specifications**:
| fit | model | shank | thread |
| --- | --- | --- | --- |
| 14mm – 30mm Saws | NT-HLS-109-A1 | 3/8" Hex (9.5mm) | 1/2"-20 |
| 32mm – 210mm Saws | NT-HLS-109-A2 | 7/16" Hex (11mm) | 5/8"-18 with Drive Pins |
| 14mm – 30mm Saws | NT-HLS-109-A4 | 1/4" Round Shank | 1/2"-20 |
| 32mm – 210mm Saws | NT-HLS-109-SDS | SDS-Plus Hammer Shank | 5/8"-18 with Drive Pins |

| Parameter | Specification |
| --- | --- |
| Material | Heat-Treated 40Cr High-Tensile Alloy Steel |
| Thread Sizes | 1/2"-20 UNF (Small Saws) & 5/8"-18 UNF (Large Saws) |
| Pilot Drill | 1/4" (6.35mm) HSS M2 Fully Ground Split Point |
| Available Shanks | 3/8" Hex, 7/16" Hex, SDS-Plus |

### 3.8 Sheet Metal Thin-Gauge Bi-Metal Hole Saw with Safety Depth Stop Collar (NT-HLS-107)
- **Canonical URL**: https://newtech-sources.com/products/sheet-metal-thin-gauge-bi-metal-hole-saw-with-depth-stop
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/sheet-metal-thin-gauge-bi-metal-hole-saw-with-depth-stop.txt
- **Model / SKU**: NT-HLS-107
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 150 Pcs
- **Direct RFQ**: https://newtech-sources.com/contact?product=Sheet%20Metal%20Thin-Gauge%20Bi-Metal%20Hole%20Saw%20with%20Safety%20Depth%20Stop%20Collar%20(NT-HLS-107)

**Overview**: Engineered specifically for electrical switchgear, automotive sheet metal, and HVAC technicians. Featuring a shallow 5mm (3/16") to 8mm (5/16") cutting depth combined with a wide raised safety collar that acts as a positive depth stop, preventing the cutter from punching through and slicing into electrical cables, hydraulic hoses, or underlying components. Fine 8 TPI teeth provide smooth, burr-free edges in sheet metal without snagging. 100% pre-shipment tested. FOB delivery from any port in China.

**Engineering Highlights**:
- Safety depth stop collar prevents over-penetration into internal cables and pipes
- Shallow cutting cup engineered specifically for sheet steel, brass, and aluminum
- Fine tooth pitch creates smooth, burr-free entry without grabbing thin sheet
- Ejection spring ensures immediate core slug expulsion

**Target Materials & Applications**: Electrical control cabinets, transformer enclosures, switchgear boxes, Automotive body panel modification, fleet vehicle outfitting, Thin stainless steel panels (up to 2mm / 14 gauge)

**Technical Specifications**:
| size | model |
| --- | --- |
| 20.4mm (M20 Electrical / 13/16") | NT-HLS-107-020 |
| 25.4mm (M25 Electrical / 1") | NT-HLS-107-025 |
| 32.5mm (M32 Electrical / 1-9/32") | NT-HLS-107-032 |
| 40.5mm (M40 Electrical / 1-19/32") | NT-HLS-107-040 |

| Parameter | Specification |
| --- | --- |
| Feature | Safety Depth Stop Collar |
| Cutting Depth | 6mm – 8mm (1/4" – 5/16") Shallow Cup |
| Tooth Material | M42 / M3 High-Speed Bi-Metal |
| Tooth Pitch | 8 TPI Fine Pitch for Thin Sheet |

### 3.9 9-Piece M42 Bi-Metal Hole Saw Set for Electricians & Plumbers (NT-HLS-102)
- **Canonical URL**: https://newtech-sources.com/products/9-piece-m42-bi-metal-hole-saw-set-electrician-plumber
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/9-piece-m42-bi-metal-hole-saw-set-electrician-plumber.txt
- **Model / SKU**: NT-HLS-102
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 50 Sets
- **Direct RFQ**: https://newtech-sources.com/contact?product=9-Piece%20M42%20Bi-Metal%20Hole%20Saw%20Set%20for%20Electricians%20%26%20Plumbers%20(NT-HLS-102)

**Overview**: Tailored specifically for electrical contractors, plumbers, and maintenance mechanics. This 9-piece kit contains the 6 most widely utilized conduit and pipe sizes (19mm/3/4", 22mm/7/8", 29mm/1-1/8", 38mm/1-1/2", 44mm/1-3/4", 57mm/2-1/4"), coupled with a 3/8" hex small arbor, a 7/16" pin-drive large arbor with HSS pilot drill, and an arbor adapter. Packed in an impact-resistant contractor case. 100% pre-shipment tested. FOB delivery from any port in China.

**Engineering Highlights**:
- 6 most popular trade sizes for electrical conduit and copper/PVC plumbing pipes
- M42 8% cobalt tooth construction provides long life in stainless and carbon steel
- Includes 2 industrial arbors with HSS pilot drills and thread adapter
- Heavy-duty blow-mold carrying case with custom foam/bracket organization

**Target Materials & Applications**: Electrical junction boxes, panel cutouts, and wire chase holes, Plumbing drain, supply line, and HVAC refrigerant piping penetrations, General MRO facilities maintenance and industrial field service

**Technical Specifications**:
| size | model | cuttingDepth |
| --- | --- | --- |
| 6 Saws (19–57mm) + 2 Arbors + 1 Adapter | NT-HLS-102-SET | 38mm (1-1/2") |

| Parameter | Specification |
| --- | --- |
| Set Piece Count | 9 Pieces Total |
| Tooth Material | M42 HSS (8% Cobalt) Bi-Metal |
| Hole Saw Sizes | 19, 22, 29, 38, 44, 57mm (3/4", 7/8", 1-1/8", 1-1/2", 1-3/4", 2-1/4") |
| Included Arbors | Small Hex Arbor (1/2"-20) & Large Pin-Drive Arbor (5/8"-18) |
| Packaging | Heavy-Duty Blow-Molded Contractor Case |

### 3.10 Multi-Blade 7-in-1 Concentric Nest Hole Saw Cutter Set (NT-HLS-111)
- **Canonical URL**: https://newtech-sources.com/products/multi-blade-7-in-1-concentric-nest-hole-saw-cutter
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/multi-blade-7-in-1-concentric-nest-hole-saw-cutter.txt
- **Model / SKU**: NT-HLS-111
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 200 Sets
- **Direct RFQ**: https://newtech-sources.com/contact?product=Multi-Blade%207-in-1%20Concentric%20Nest%20Hole%20Saw%20Cutter%20Set%20(NT-HLS-111)

**Overview**: A versatile space-saving cutting set for homeowners, maintenance staff, and carpenters. Features a heavy-duty die-cast aluminum alloy drive disc that accommodates 7 interchangeable concentric flexible saw bands ranging from 25mm (1") to 63mm (2-1/2"). Simply select the required diameter blade and insert it into the matching base groove. Cuts clean circular openings in wood, plasterboard, and plastics without requiring multiple bulky tools. 100% pre-shipment tested. FOB delivery from any port in China.

**Engineering Highlights**:
- 7 interchangeable concentric cutting blades nestled in one compact aluminum disc
- Blades: 25mm, 32mm, 38mm, 45mm, 50mm, 56mm, 63mm (1" to 2-1/2")
- Heavy die-cast alloy base with integral 3/8" round arbor shank and pilot bit
- Induction-hardened teeth slice cleanly through timber, plywood, and drywall

**Target Materials & Applications**: Woodworking, joinery, and wooden craft fabrication, Ceiling drywall and plywood partition electrical penetrations, Compact tool kits and residential maintenance sets

**Technical Specifications**:
| size | depth | model |
| --- | --- | --- |
| 7 Blades (25–63mm) + Aluminum Disc Base | 25mm (1") | NT-HLS-111-7IN1 |

| Parameter | Specification |
| --- | --- |
| Configuration | 7-in-1 Concentric Nested Blades |
| Base Material | Die-Cast Aluminum Alloy |
| Blade Material | Hardened 65Mn Spring Steel |
| Included Diameters | 25, 32, 38, 45, 50, 56, 63mm (1" – 2-1/2") |
| Cutting Depth | 25mm (1") |

### 3.11 13-Piece Master M42 Bi-Metal Hole Saw Complete Industrial Case Set (NT-HLS-105)
- **Canonical URL**: https://newtech-sources.com/products/13-piece-master-m42-bi-metal-hole-saw-case-set
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/13-piece-master-m42-bi-metal-hole-saw-case-set.txt
- **Model / SKU**: NT-HLS-105
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 40 Sets
- **Direct RFQ**: https://newtech-sources.com/contact?product=13-Piece%20Master%20M42%20Bi-Metal%20Hole%20Saw%20Complete%20Industrial%20Case%20Set%20(NT-HLS-105)

**Overview**: Our premier commercial installation hole saw kit. The 13-piece assortment equips field crews for virtually any penetration in sheet metal, structural steel, wood studs, and plastic composite materials. Featuring 9 precision M42 8% cobalt hole saws (19mm/3/4", 22mm/7/8", 25mm/1", 32mm/1-1/4", 38mm/1-1/2", 44mm/1-3/4", 51mm/2", 64mm/2-1/2", 76mm/3"), 2 industrial quick-release arbors, extra HSS center drill, and adapter. 100% pre-shipment tested. FOB delivery from any port in China.

**Engineering Highlights**:
- 9 industrial M42 bi-metal hole saws spanning 19mm (3/4") to 76mm (3")
- Superior 4/6 variable tooth pitch delivers aggressive cuts and chatter-free operation
- Heavy-duty pin-drive arbor ensures high torque without thread binding
- Complete contractor case with custom molded slots for each component

**Target Materials & Applications**: Commercial construction, fire safety piping, HVAC ducting, Electrical switchgear panels, heavy marine fabrication, Industrial plant maintenance and facility retrofits

**Technical Specifications**:
| size | model |
| --- | --- |
| 9 Saws + Complete Accessories in Industrial Case | NT-HLS-105-SET |

| Parameter | Specification |
| --- | --- |
| Set Count | 13 Pieces |
| Hole Saw Sizes | 19, 22, 25, 32, 38, 44, 51, 64, 76mm (3/4" – 3") |
| Cutting Depth | 38mm (1-1/2") |

### 3.12 10-Piece M42 Bi-Metal Hole Saw Contractor Kit with Ejection Springs (NT-HLS-103)
- **Canonical URL**: https://newtech-sources.com/products/10-piece-m42-bi-metal-hole-saw-contractor-kit
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/10-piece-m42-bi-metal-hole-saw-contractor-kit.txt
- **Model / SKU**: NT-HLS-103
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 50 Sets
- **Direct RFQ**: https://newtech-sources.com/contact?product=10-Piece%20M42%20Bi-Metal%20Hole%20Saw%20Contractor%20Kit%20with%20Ejection%20Springs%20(NT-HLS-103)

**Overview**: Engineered for high-throughput installation crews requiring zero downtime between cuts. This 10-piece set includes 6 heavy-duty M42 bi-metal hole saws (22mm/7/8", 29mm/1-1/8", 35mm/1-3/8", 44mm/1-3/4", 51mm/2", 64mm/2-1/2"), two quick-lock arbors with high-speed steel pilot bits, an ejection spring that automatically pops out wood and metal slugs upon breakthrough, and an Allen wrench. 100% pre-shipment tested. FOB delivery from any port in China.

**Engineering Highlights**:
- Spring-loaded pilot drill ejects plugs automatically for continuous drilling
- 6 core trade hole saws covering 22mm (7/8") to 64mm (2-1/2")
- Heavy-duty positive locking arbor pins eliminate chuck binding
- M42 8% cobalt teeth cut effortlessly through steel plates and timber alike

**Target Materials & Applications**: Commercial electrical switchgear and conduit installation, Water supply, hydronic heating, and drainage pipe cutouts, Commercial modular building and steel container home conversions

**Technical Specifications**:
| size | model | cuttingDepth |
| --- | --- | --- |
| 6 Saws (22–64mm) + Complete Accessories | NT-HLS-103-SET | 38mm (1-1/2") |

| Parameter | Specification |
| --- | --- |
| Set Count | 10 Pieces |
| Hole Saw Sizes | 22, 29, 35, 44, 51, 64mm (7/8", 1-1/8", 1-3/8", 1-3/4", 2", 2-1/2") |
| Accessories | 2 Arbors, Pilot Drill, Ejection Spring, Hex Key |

### 3.13 12-Piece M42 Bi-Metal Hole Saw Master Technician Assortment Set (NT-HLS-104)
- **Canonical URL**: https://newtech-sources.com/products/12-piece-m42-bi-metal-hole-saw-master-technician-kit
- **Markdown Datasheet**: https://newtech-sources.com/llms/products/12-piece-m42-bi-metal-hole-saw-master-technician-kit.txt
- **Model / SKU**: NT-HLS-104
- **Discipline**: Hole Saws
- **Minimum Order Quantity (MOQ)**: 40 Sets
- **Direct RFQ**: https://newtech-sources.com/contact?product=12-Piece%20M42%20Bi-Metal%20Hole%20Saw%20Master%20Technician%20Assortment%20Set%20(NT-HLS-104)

**Overview**: A comprehensive job-site solution for mechanical engineers, factory maintenance departments, and general contractors. Contains 8 precision M42 bi-metal hole saws ranging from 19mm (3/4") to 76mm (3"), accompanied by both small and large pin-drive arbors, a spare 1/4" HSS pilot bit, and an arbor adapter. Electron-beam welded M42 cutting edges handle tough structural metals without tooth stripping. 100% pre-shipment tested. FOB delivery from any port in China.

**Engineering Highlights**:
- 8 M42 bi-metal hole saws spanning from 19mm (3/4") up to 76mm (3")
- Includes both small (1/2"-20) and large heavy-duty pin-lock (5/8"-18) arbors
- Spare high-speed steel split-point pilot drill included in case
- Tough blow-mold carry case with secure latches and handle

**Target Materials & Applications**: Industrial plant maintenance, electrical room fit-outs, Plumbing supply, vent stacks, and sewer pipe installations, HVAC duct work, fire sprinkler line cutouts

**Technical Specifications**:
| size | model |
| --- | --- |
| 8 Saws (19–76mm) + 2 Arbors + Spare Drill + Hex Key | NT-HLS-104-SET |

| Parameter | Specification |
| --- | --- |
| Set Count | 12 Pieces |
| Hole Saw Sizes | 19, 22, 29, 35, 38, 51, 64, 76mm (3/4" – 3") |
| Tooth Material | M42 HSS 8% Cobalt |