The VÖLKEL single-cut machine tap to JIS B-4430, Form C with a 35° spiral flute, is engineered for cutting American straight pipe threads NPS 1" x 11.5. The spiral flute lifts chips reliably from blind holes, ensuring clean flanks and stable processes in machinable, unalloyed and low-alloy steels up to 900 N/mm². Suitable for both hand and machine use.
Key benefits:
JIS B-4430 defines dimensions, tolerances and geometries for machine taps to ensure repeatable thread quality and interchangeability.
Form C with 35° spiral flute combines a medium lead with active chip lift. This keeps blind holes clear, protects cutting edges and produces clean thread flanks.
Which materials is it designed for?
Machinable, unalloyed and low-alloy steels up to 900 N/mm².
Is it suitable for blind holes?
Yes. The 35° spiral flute evacuates chips upward, ideal for blind holes.
Hand or machine use?
Both. Use a suitable hand tap holder (square 21 mm) or a tapping chuck on a machine.
What does “single-cut” mean?
Threads are produced in one pass without separate roughing and finishing taps, improving efficiency and accuracy.
Which lubrication is recommended?
Use appropriate cutting oil/coolant for better surface finish, chip control and tool life.
Questions about selection or use? Our team will be happy to assist – please use the contact form.
| Type of thread | american tapered pipe thread |
|---|---|
| Standard | JIS B-4430 |
| Form | Form C |
| Material | HSSE |
| Tolerance | medium |
| Size | NPS 1" x 11.5 |
| Overall length (L1) | 95 mm |
| Thread length (L2) | 45 mm |
| Core hole diameter (D1) | 30.6 mm |
| Shank diameter (D2) | 26.0 mm |
| Drive connector | 21.0 mm |
| EAN | 4022835997382 |
| Item number | 99738 |
| Type of flute | 35° Spiral Flute |
| Application | for blind holes |
| Thread standard | ANSI |
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