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Description
Technical data for the drill bit for metal, Ø40 mm, with reduced shank
| Technical data | |
|---|---|
| Working diameter of drill d | Ø40 mm |
| Overall length l1 | 152 mm |
| Flute length l2 | 65 mm |
| Shank diameter - 1.2" | 12.7 mm |
- 1/2 inch reduced shank – mounting without adapters
- Drilling in steels up to 35 HRC
- High-quality HSS steel
- IT11 tolerance (±130 µm)
- Ground surface – low roughness
Cutting data for the Ø40 mm HSS NWKa drill bit
| Material | Cutting speed Vc [m/min] | Feed per revolution f [mm] | Spindle speed n [rpm] | Total feed rate [mm/min] |
|---|---|---|---|---|
| PSteel | 14-25 | 0.25 | 111 | 56 |
| KCast iron | 10-18 | 0.25 | 80 | 40 |
May be useful
Cutting parameters calculator
Ø40 mm HSS reduced-shank metal drill bit – a professional tool for large holes
Industrial 40 mm diameter drill bit with a reduced shank made of high-speed steel (HSS) is a tool developed for the most demanding machining processes. The shank, reduced to a diameter of 12.7 mm (half an inch), allows direct mounting in standard industrial holders without additional components. The tool is intended for heavy manufacturing plants, industrial toolrooms, and shops specializing in steel structures and machinery repairs.
Specifications of the 40 mm diameter Varel reduced-shank drill bit
- 1/2 inch reduced shank – mounting without adapters
- Drilling in steels up to 35 HRC
- High-quality HSS steel
- IT11 tolerance (±160 µm)
- Ground surface – low roughness
The reduced-shank design eliminates compatibility issues between larger tools and standard workshop equipment. The ground surface finish effectively dissipates heat from the cutting zone, ensuring stable operation during extended use in series production and industrial repairs.
Frequently asked questions
This drill bit is intended for machining S235 and S355 structural steels with a maximum hardness of 35 HRC, as well as gray cast iron, aluminum alloys, and brass. We do not recommend use in steels hardened above 35 HRC or in austenitic stainless steel grades.
For 40 mm diameter drill bits, coolant use is practically essential. Proper use of a machining emulsion or oil extends drill bit life by up to 60 percent and provides significantly higher dimensional accuracy and surface quality of the holes produced.
For S235 structural steel, we recommend a speed range of 110-175 rpm, while for S355 steel the range is 65-125 rpm. Exceeding these parameters leads to excessive tool heat buildup and rapid loss of its cutting ability.
Product accessories
Countersink 45/90 DIN 335 C HSS cone countersink
Reference: 0000009863 In stock > 10 items
€52.63
€64.74 brutto
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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