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Description
Technical data of machine tapping No 10-32 UNF
| Technical data | |
|---|---|
| thread diameter | No 10-32 |
| thread pitch P | 32 threads per inch |
| overall length l1 | 70 mm |
| flute length l2 | 13 mm |
| shank diameter d2 | 3.5 mm |
| square drive size a | 2.7 mm |
| tap drill diameter | 4.1 mm |
| Chamfer | C (2÷3) P |
| Cutting edge helix angle | 40° |
How a spiral flute tap evacuates chips from a blind hole
The 40° flute works like a screw conveyor
The flutes of this tap spiral to the right at an angle of 40° to the axis. The tap rotates clockwise and advances into the hole. The chip cut by the chamfer enters the flute, and the helix carries it upward like the auger in a meat grinder. The bottom of the hole stays clean, and the cutting edges do not encounter packed chips. The UNF No 10-32 tap has a reduced shank in accordance with DIN 374: diameter 3.5 mm, square 2.7 mm.
1
The 40° spiral flute carries chips upward from the chamfer.
2
The stepped chip exits the hole and breaks into short pieces.
3
The tap rotates clockwise to cut a right-hand thread.
4
Chamfer C: 2–3 incomplete threads on the tapered lead.
5
Clearance below the tap tip – min. 2 thread pitches above the bottom.
6
The UNF No 10-32 thread has 32 threads per inch; the feed is approximately 0.794 mm/rev.
No 10-32 UNF American machine tap for stainless steel
UNF No 10-32 tap for blind holes is used for precise cutting of Unified Fine threads in blind holes; the 40° spiral flute carries chips upward, stabilizing cutting torque from the first pass, using the phrase: UNF 10-32 machine tap.
UNF No 10-32 spiral flute tap cuts UNF 10-32 threads in accordance with ASME B1.1 (60° profile); the major diameter of No.10 is 4.826 mm, and the pitch is 0.7938 mm (32 TPI). The DIN 374 design, form C with a 2–3-thread chamfer, is optimized for blind holes. The HSSE core provides increased hot strength and resistance to edge chipping in structural and low-alloy steels. The uncoated version (bright finish) maintains predictable geometry; external coolant or MQL is recommended. Selecting suitable holders for the UNF 10-32 machine tap helps maintain concentricity and a stable effective diameter.
- Stable cutting process — the 40° helix improves chip evacuation from the bottom, reducing the risk of jamming and torque increases.
- Clean thread profile — form C limits crushing near the bottom, helping achieve class 2B without retapping.
- HSSE cutting edge durability — cobalt HSSE increases wear resistance during interrupted cutting and when material hardness varies.
- Dimensional accuracy — uniform geometry in accordance with DIN 374 supports a repeatable effective diameter; applications with limited depth benefit from a UNF 10-32 machine tap for blind holes.
Compliance: ASME B1.1 (UNF 10-32, class 2B), DIN 374 design, form C; intended for machining steel where predictable surface quality and repeatable thread parameters are required.
The design ensures consistent geometry at the bottom of the hole and stable surface roughness, helping maintain assembly tolerances in holders with and without compensation.
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