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Description
Technical data for the drill bit for metal, Ø31 mm, with reduced shank
| Technical data | |
|---|---|
| Working diameter of drill d | Ø31 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 Ø31 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 | 144 | 72 |
| KCast iron | 10-18 | 0.25 | 103 | 51 |
May be useful
Cutting parameters calculator
Ø31 mm HSS reduced-shank metal drill bit – a tool for demanding industrial machining
An industrial tool with a diameter of Ø31 mm and a reduced shank made of high-speed steel (HSS) is a solution for the most demanding production applications. The shank reduced to 12.7 mm in diameter (half an inch) allows direct mounting in standard drill holders. The product is designed for industrial plants, toolrooms, and workshops involved in steel fabrication and machinery overhaul.
Key specifications of the Varel Ø31 mm reduced-shank drill bit
- 1/2-inch reduced shank – allows direct mounting in drill presses and magnetic drills without adapter sleeves
- IT11 tolerance compliant with ISO 286-1 – drilled holes achieve an accuracy of ±130 µm, suitable for workshop and assembly joints
- Ground surface – provides precise guidance and reduces drilling resistance by 25 percent compared with roll-forged drill bits
- Machining materials up to 35 HRC – effective in S235 and S355 structural steels, gray cast iron, and aluminum alloys
- Varel brand tool – guaranteed manufacturing quality and machining precision
The reduced-shank design eliminates problems fitting large-diameter tools to standard machines. The smooth working surface effectively dissipates heat during intensive use, ensuring stable performance in series production and industrial repairs.
Frequently asked questions
The Ø31 mm drill bit performs well in S235 and S355 structural steels with a maximum hardness of 35 HRC, as well as in cast iron, aluminum, and brass. It should not be used in hardened steels exceeding 35 HRC or in high-chromium stainless steel grades.
Large-diameter drill bits generate considerable heat during cutting, which can lead to overheating and loss of sharpness. Using an emulsion or oil extends tool life by up to 60 percent and ensures better hole quality.
For S235 steel, we recommend a range of 155-220 rpm; for S355 steel, set 110-170 rpm. Exceeding these values causes excessive tool heating and a rapid loss of cutting performance.
Product accessories
Countersink countersink 35/90 DIN 335 C HSS
Reference: 0000009536 In stock > 10 items
€34.74
€42.73 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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