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Description
Technical data for the 1/4-28 UNF spiral flute machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 1/4-28 UNF |
| helix angle | 40° |
| thread pitch P | 28 threads per inch |
| overall length l1 | 80 mm |
| flute length l2 | 10 mm |
| working length l3 | 30 mm |
| shank diameter d2 | 7 mm |
| square drive size | 5.5 mm |
| tap drill diameter | 5.5 mm |
| Chamfer | C (2÷3) P |
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 1/4-28 tap has a reduced shank in accordance with DIN 374: diameter 7 mm, square 5.5 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 1/4-28 thread has 28 threads per inch; the feed is approximately 0.907 mm/rev.
1/4-28 UNF American machine tap for stainless steel
High-quality professional 1/4-28 machine tap UNF with a reinforced shank for machine tapping American Unified threads, type UNF (fine threads). These are inch-based threads with a diameter of ¼ inch and 28 threads per inch. Chamfer type C (2 – 3 P) – for through and blind holes in short-chipping materials. The threads have a triangular profile (60° angle).
The finished thread tolerance class is 2B. Our store offers high-grade Unified thread machine taps manufactured in accordance with DIN 374/40 from advanced, high-quality high-speed steel with 5% cobalt added. This exceptional cobalt steel enables high machining productivity, reduces tapping time per component, and thus allows more efficient use of available workstations. In addition, our 1/4-28 UNF machine taps are highly resistant to elevated temperatures (up to 670°C), allowing high-speed machining. The tap cutting edges resist mechanical damage, significantly extending their service life.
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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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