Precision Twist Drill Bits Manufacturer

Twist Drill

Precision Twist Drill Bits Manufacturer | HSS, Cobalt & Carbide Drills

Precision twist drill bits are essential cutting tools for clean, accurate, and efficient hole making in metalworking and industrial fabrication.

Our twist drill range is developed to support a wide variety of drilling needs, including HSS twist drills for general-purpose work, cobalt twist drills for harder materials, and extended-length options for deeper or harder-to-reach holes. Available configurations include jobber length, taper length, extra-long, stub length, reduced shank and aircraft extension drill bits. Buyers can select the required diameter, overall length, flute length, point angle, finish and packaging for wholesale or OEM orders.

SINOLITE supplies HSS twist drill bits for industrial distributors, tool brands, wholesalers and professional metalworking applications. Our range covers HSS-R roll-forged drills, HSS-G fully ground drills and HSS-E cobalt drill bits in metric and fractional sizes.

Quick specification: metric diameters from 1 mm to 32 mm, fractional diameters from 1/64 inch to 1-1/2 inches, 118° or 135° points, and DIN 338, DIN 340, DIN 1869, DIN 1897 and NAS 907 options depending on the product series.

HSS Twist Drill Bit Sizes and Specifications

Twist Drill Type	Material and Process	Available Size Range	Standard and Length	Point and Finish	Recommended Use
HSS-R Twist Drill Bits	Roll-forged high-speed steel	1–20 mm; 1/64–1/2 inch	DIN 338 jobber length; DIN 340 long series	118° point; black oxide, bright or titanium-coated	General workshop drilling, mild steel, aluminum, plastic and wood
HSS-G Twist Drill Bits	Fully ground high-speed steel	1–20 mm; fractional sizes available	DIN 338 and DIN 340	135° split point; bright, black or black-and-gold finish	Accurate holes in steel, alloy steel, cast iron and aluminum
HSS-E Cobalt Drill Bits	HSS-E with 5–8% cobalt	1/64–1/2 inch; metric options available	Jobber and taper length	Fully ground flute; 135° split point	Stainless steel, harder steel, alloy steel and cast iron
Reduced Shank Drill Bits	Fully ground or milled HSS-G	13–32 mm; 33/64–1-1/2 inches	151 mm or 6-inch overall length	135° split point	Large-diameter holes using machines with limited chuck capacity
Extra-Long Twist Drill Bits	Fully ground HSS-G	2–13 mm	DIN 1869; overall lengths from 125–295 mm	135° split point	Deep holes and difficult-to-reach drilling positions
Stub Drill Bits	Fully ground HSS-G	1–13 mm; fractional sizes available	DIN 1897 screw-machine length	135° split point	Rigid, accurate drilling on machines with restricted working space
Aircraft Extension Drill Bits	Fully ground industrial HSS-G	1/16–1/2 inch	NAS 907; 6-inch and 12-inch lengths	135° split point	Deep-reach holes in sheet metal, fabricated parts and assemblies

Why Choose Our Precision Twist Drill Bits for Industrial Metal Drilling

· Reliable cutting performance for metal, alloy, and stainless steel drilling
· Multiple material options to match different drilling conditions
· Stable geometry for smoother drilling and better hole consistency
· Suitable for general-purpose use, CNC tooling, maintenance, and repair work
· OEM and bulk supply support for distributors and industrial buyers

Production, OEM and Bulk Supply Capability

Established in 2005, SINOLITE has more than 20 years of experience supplying cutting tools and machine tool accessories to overseas markets. Our product and supply-chain system covers more than 5,000 SKUs, helping distributors consolidate different twist drill sizes, materials and packaging formats into one purchasing program.

Expanded packing facilities support OEM and ODM orders, including:

· Custom brand and logo marking
· Individual PVC tubes and plastic boxes
· Metal drill indexes and multi-piece drill bit sets
· Blister cards, color boxes and bulk packaging
· Custom labels, barcodes and multilingual instructions
· Mixed-size and market-specific assortments

Quality Control and Product Standards

Available twist drill series are manufactured according to relevant dimensional standards such as DIN 338, DIN 340, DIN 1869, DIN 1897 and NAS 907. Buyers requiring specific quality certificates, material documentation, compliance declarations or third-party inspection should list these requirements in the RFQ so document availability can be confirmed before production.

If you are looking for Metal Cutting Tools Manufacturer with reliable performance and flexible sourcing support, Sinolite is ready to supply the products your market needs. Send us your required diameter range, length, material, and quantity. We will recommend the most suitable twist drill solution for your market.