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Description
Technical data for the drill bit for metal, Ø33 mm, with reduced shank
| Technical data | |
|---|---|
| Working diameter of drill d | Ø33 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 Ø33 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 | 135 | 68 |
| KCast iron | 10-18 | 0.25 | 96 | 48 |
May be useful
Cutting parameters calculator
Ø33 mm HSS reduced-shank metal drill bit – a professional tool for large holes
High-performance Ø33 mm HSS drill bit with a reduced shank is a tool designed for demanding industrial applications. The 12.7 mm (half-inch) diameter shank fits directly into standard drill chucks without specialized adapters. The tool is designed for metal manufacturing plants, repair shops, and professional industrial toolrooms.
Advantages of the 33 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 (±130 µm)
- Ground surface – low roughness
A reduced shank effectively resolves compatibility issues between large tools and standard workshop equipment. The ground surface finish limits heat buildup during operation, allowing the tool to maintain its cutting performance even under intensive production use.
Frequently asked questions
The drill bit works effectively in S235 and S355 structural steels with a maximum hardness of 35 HRC, as well as in gray cast iron, aluminum, and brass. We do not recommend use in steels hardened above 35 HRC or in austenitic stainless steel grades.
Dry drilling at such large diameters is strongly discouraged. Proper use of a coolant emulsion or oil extends drill bit life by up to 60 percent and provides significantly better hole dimensional accuracy and surface finish.
For S235 structural steel, we recommend a setting of 145-210 rpm; for S355 steel, use 100-160 rpm. Excessive speeds cause the tool to overheat and rapidly lose its cutting ability.
Product accessories
Tapered countersink 37/90 DIN 335 C HSS
Reference: 0000004108 In stock > 10 items
€32.11
€39.49 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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