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Description
Technical data for the drill bit for metal, Ø39 mm, with reduced shank
| Technical data | |
|---|---|
| Working diameter of drill d | Ø39 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 Ø39 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 | 114 | 57 |
| KCast iron | 10-18 | 0.25 | 82 | 41 |
May be useful
Cutting parameters calculator
Ø39 mm HSS reduced-shank metal drill bit – an efficient tool for heavy industry
Specialized Ø39 mm high-speed steel (HSS) drill bit with a reduced shank is a tool designed for the most demanding machining applications. The shank, reduced to a diameter of 12.7 mm (half an inch), fits directly into standard chucks without adapter sleeves. This solution is intended for heavy industry plants, repair shops, and technical departments of manufacturing companies.
Technical specifications of the Varel Ø39 mm 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 (±130 µm)
- Ground surface – low roughness
Reduced-shank technology effectively meets the needs of facilities equipped with standard drilling machines. The smooth working surface obtained by precision grinding minimizes friction and temperature during cutting, ensuring tool reliability in continuous production and emergency repairs.
Frequently asked questions
The Ø39 mm HSS drill bit performs well in S235 and S355 structural steels with a maximum hardness of 35 HRC, as well as in gray cast iron, aluminum, and brass. We advise against use in heat-treated steels with a hardness exceeding 35 HRC and in austenitic stainless steel grades.
Drill bits with diameters close to 40 mm generate extreme amounts of heat during operation. Proper cooling and lubrication can extend drill bit service life by up to 60 percent and significantly improve the dimensional accuracy and surface finish of the holes produced.
When machining S235 steel, we suggest a range of 115-180 rpm, while for S355 the range is 70-130 rpm. Higher spindle speeds lead to excessive heat generation and rapid loss of the tool's cutting properties.
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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