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Description
Technical data for the 1/4-28 UNF machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 1/4-28 |
| 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 | B (3.5÷5.5) P |
How the type B through-hole chamfer pushes chips down the hole
Chips exit at the bottom instead of returning through the thread
The form B through-hole chamfer has a chip breaker at the tip of the tap – an angled notch in the cutting edges. The chip breaker directs chips down the hole, ahead of the tap tip. The chips curl into a spring shape, break into short pieces, and exit the hole on the other side of the workpiece. The threads already cut remain clear because chips do not pass through them on their way upward. The UNF 1/4-28 tap has a reinforced shank according to DIN 371: diameter 7 mm, square size 5.5 mm.
1
Straight flute – chips do not enter it; the flute carries lubricant to the cutting edges.
2
The chip breaker at the tip of the tap directs chips down the hole.
3
The tap rotates clockwise to cut a right-hand thread.
4
B chamfer: 3.5–5.5 incomplete threads on the entry taper.
5
The chips break into segments: individual pieces at the top of the hole, with progressively more farther down. They fall out below the workpiece.
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
Modern 1/4-28 UNF machine tap with an extended shank for cutting American Unified UNF threads. These are fine inch threads with a diameter of ¼ inch (28 threads per inch). Form B tap chamfer – for machining through holes and blind holes of various depths in materials producing short chips. Our 1/4-28 UNF Unified machine taps are designed for tapping components made from very hard and difficult-to-machine materials, including alloy steels, heat-resistant steels, acid-resistant steels, cast iron, cast steel, and steels up to 800 MPa. These machine taps are suitable even for cutting at very high speeds, which generate very high temperatures. The cutting edges resist mechanical damage (breakage, cracking, chipping, dulling). This gives the tools a very long service life.
Product accessories
UNF 1/4-28 DIN 374/40 C HSSE tapping
Reference: 0000006199 In stock < 10 items
€12.37
€15.21 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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