产品规格
3.9mm HSS Jobber Drill
Roll-Forged HSS Jobber Drill (DIN 338)
Resilient Design for Demanding Tasks
This 3.9mm jobber drill is manufactured using a roll-forging process, which preserves the integrity of the material structure. This results in a highly resilient tool capable of withstanding the stresses of arduous drilling tasks, making it a reliable choice for handheld drill operations. Built to DIN 338 dimensional standards, it features a standard helix angle and robust core thickness for consistent performance.
Key Technical Specifications
- • Material: HSS (High-Speed Steel).
- • Point Angle: 118°.
- • Tolerance: h8 nominal diameter.
- • Drilling Depth: Recommended L₂ max of 37.2 mm.
- • Coating: Uncoated.
| Nominal ⌀ (DC) | 3.9 mm |
| Overall Length (L) | 75 mm |
| Flute Length (Lc) | 43 mm |
| Feed (Steel < 750 N/mm²) | 0.03 mm/rev |
Drilling Guidance
To ensure optimal tool life and accuracy, the maximum drilling depth is calculated as:
*Always ensure the drill is securely held in the chuck and consider the material properties when selecting your feed rate.
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