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Certified Fractional Inch Size Drill Bits
Premium high-speed steel construction delivers exceptional hardness for metal drilling.
Precision spiral flute design enables fast, efficient chip removal during drilling.
Precision ground split point eliminates walking for accurate hole positioning.
Standard round shank fits most drill chucks for universal compatibility.
Fully CNC precision ground for consistent quality and dimensional accuracy.
Trusted by Global Brands
OEM Partner for Industry Leaders
Customization & Packaging
Complete OEM/ODM solutions tailored to your brand requirements
Build Your Own Brand with CustomFractional Inch Size Drill Bits
- Material: HSS4241 / HSS54341 / HSS6542 (M2) / M35 Co5% / M42 Co8%
- Surface Finish: Black Oxide / Silver / Titanium Coated / Amber / Titanium Coated with Black
- Shank Type Customization Straight shank / Reduced shank
- OEM / ODM support with custom laser logo engraving
Application Notes
Discover the versatile applications and material compatibility of our products
Drilling Aluminum Alloy
- •Twist drill bits provide smooth drilling in aluminum alloy with clean hole finishing and efficient chip removal for daily metalworking applications.
Drilling PVC
- •Designed for stable PVC drilling, twist drill bits help reduce cracking and support clean, accurate holes in plastic materials.
Drilling Wood
- •Suitable for wood drilling applications, delivering fast penetration, smooth cutting, and stable hole accuracy in softwood and hardwood materials.
Real Factory & Application Videos
Watch real manufacturing and field applications to verify quality, performance, and supply capability
How To Choose Twist Drills For Bulk Purchase Without Losing Cost?
Factory Direct Twist Drills With Strict Quality Control, Stable Batch Consistency
Which Factory Offers More Stable Quality For High-Hardness Twist Drills?
Cobalt-Alloyed (M35/M42) Twist Drills For Hardened Stainless Steel
Have You Found The Right Supplier For Stainless Steel Cutting Twist Drills?
Polished Flutes For Low-Friction Chip Flow, No Aluminum Clogging
Our Production Process
From raw materials to finished products, every step is meticulously controlled to ensure superior quality and precision.
Raw Material Cutting
Heat Treatment
Coarse Grinding
Shank Grinding
Flute Edge Grinding
Fine Grinding
Double Angle
Angle Grinding
Sharping Edge
International Certifications
Our products meet the highest international standards and are certified by leading quality organizations worldwide.
RoHS Certificate
• Expiry Date:2027.10.05
ISO 9001:2015
• Expiry Date:2028.10.05
SGS Audit Report
• Expiry Date:2028.01.05
Product Spec Table
| SKU | Key Specs | Material / Coating | Packaging |
|---|---|---|---|
| 1/64"/0.5mm | 12mm Flute Length / 34mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/64"/1.0mm | 12mm Flute Length / 34mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 1/16"/1.5mm | 20mm Flute Length / 43mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 5/64"/2.0mm | 24mm Flute Length / 49mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/32"/2.5mm | 30mm Flute Length / 57mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 7/64"/3.0mm | 33mm Flute Length / 61mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 9/34"/3.5mm | 39mm Flute Length / 70mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 5/32"/4.0mm | 43mm Flute Length / 75mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 11/64"/4.5mm | 47mm Flute Length / 80mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/16"/5.0mm | 52mm Flute Length / 86mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 7/32"/5.5mm | 57mm Flute Length / 93mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 15/64"/6.0mm | 57mm Flute Length / 93mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 1/4"/6.5mm | 63mm Flute Length / 101mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 17/64"/7.0mm | 69mm Flute Length / 109mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 9/32"/7.5mm | 169mm Flute Length / 101mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 5/16"/8.0mm | 75mm Flute Length / 117mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 21/64"/8.5mm | 75mm Flute Length / 117mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 11/32"/9.0mm | 81mm Flute Length / 125mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/8"/9.5mm | 81mm Flute Length / 125mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 25/64"/10.0mm | 87mm Flute Length / 133mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 13/32"/10.5mm | 87mm Flute Length / 133mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 27/26"/11mm | 94mm Flute Length / 142mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 7/16"/11.5mm | 94mm Flute Length / 142mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 15/32"/12mm | 101mm Flute Length / 151mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 31/64"/12.5mm | 101mm Flute Length / 151mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 1/2"/13.0mm +mm | 101mm Flute Length / 151mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 17/32"/13.5mm | 108mm Flute Length / 160mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 9/16"/14.0mm | 108mm Flute Length / 160mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 37/64"/14.5mm | 114mm Flute Length / 169mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 19/32"/15.0mm | 114mm Flute Length / 169mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 39/64"/15.5mm | 120mm Flute Length / 178mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 5/8"/16.0mm | 120mm Flute Length / 178mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 21/32"/16.5mm | 125mm Flute Length / 184mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 43/64"/17.0mm | 125mm Flute Length / 184mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 11/16"/17.5mm | 130mm Flute Length / 191mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 45/64"/18.0mm | 130mm Flute Length / 191mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 47/64"/18.5mm | 135mm Flute Length / 198mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/4"/19.0mm | 135mm Flute Length / 198mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 49/64"/19.5mm | 140mm Flute Length / 205mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 25/32"/20.0mm | 140mm Flute Length / 205mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
Frequently Asked Questions
Everything you need to know about our products, customization options, and ordering process.
What Are Fractional Drill Bit Sizes?
Fractional drill bit sizes are measured in inch fractions, commonly used for standard imperial drilling and hardware fitting work.
What Are Fractional Bits?
Fractional bits are drill bits marked with inch fraction measurements, matching imperial fastener and hole standard sizes.
What Is 2.5 Mm To Inches Fraction Drill Bit?
2.5 mm converts to a near 3/32 inch fractional drill bit, suitable for general light metal and wood drilling applications.
What Size Is A 1 4 20 Drill Fractional?
The standard fractional drill size for 1/4-20 thread is 13/64 inch, perfectly matched for tapping and thread making.
What Are Fractional Drill Bit Sizes?
Fractional drill sizes follow imperial inch grading, covering common small to large sizes for mechanical and construction use.
What Size Drill Bit For A 1/4-20 Hole?
Use a 13/64 inch fractional drill bit to pre-drill accurate holes for standard 1/4-20 screw tapping and installation.
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Trusted by businesses worldwide
See what our global partners say about our premium drilling tools and cutting solutions.
"We Source Certified Fractional Inch Size Drill Bits For North American Hardware Chain Sales. All Inch Specs Comply With Local Market Standards, Supporting One-Stop Bulk Procurement. Complete Certification And Stable Supply Make Us Willing To Develop Long-Term Exclusive Cooperation."
Robert Collins
Hardware Chain Purchaser
US
"We Mainly Import Fractional Inch HSS Drill Bits For Local Distribution. Strict Size Tolerance And Complete Inspection Documents Help Us Pass Customs And Market Checks Easily. The Supplier Is Professional And Trustworthy, We Will Keep Continuous Annual Orders."
Fiona Campbell
Building Hardware Importer
Canada
"We Adopt Fractional Inch Drill Bits For Legacy Machinery Assembly And Factory Daily Maintenance. Standard Inch Sizing Fits Old Equipment Perfectly, And Tough HSS Steel Withstands Frequent Use. We Are Happy To Stay As Your Long-Term Fixed Procurement Client."
Lars Johansen
Industrial Maintenance Supervisor
Norway
"We Source Certified Fractional Inch Size Drill Bits For North American Hardware Chain Sales. All Inch Specs Comply With Local Market Standards, Supporting One-Stop Bulk Procurement. Complete Certification And Stable Supply Make Us Willing To Develop Long-Term Exclusive Cooperation."
Robert Collins
Hardware Chain Purchaser
US
"We Mainly Import Fractional Inch HSS Drill Bits For Local Distribution. Strict Size Tolerance And Complete Inspection Documents Help Us Pass Customs And Market Checks Easily. The Supplier Is Professional And Trustworthy, We Will Keep Continuous Annual Orders."
Fiona Campbell
Building Hardware Importer
Canada
"We Adopt Fractional Inch Drill Bits For Legacy Machinery Assembly And Factory Daily Maintenance. Standard Inch Sizing Fits Old Equipment Perfectly, And Tough HSS Steel Withstands Frequent Use. We Are Happy To Stay As Your Long-Term Fixed Procurement Client."
Lars Johansen
Industrial Maintenance Supervisor
Norway
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