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Description
Technical data for the 1/4-20 machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 1/4-20 |
| thread pitch P | 20 threads per inch |
| overall length l1 | 80 mm |
| flute length l2 | 18 mm |
| working length l3 | 32 mm |
| shank diameter d2 | 7 mm |
| square drive size | 5.5 mm |
| tap drill diameter | 5.1 mm |
| Chamfer | B (3÷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 B through-hole chamfer has a chip breaker at the front of the tap – an angled grind on the cutting edges. The chip breaker directs chips down the hole, ahead of the tap tip. Chips curl into a coil, break into short pieces and exit the hole on the other side of the workpiece. The threads already cut remain clean because chips do not pass through them on their way upward. The UNC 1/4-20 tap has a reinforced shank to DIN 371: diameter 7 mm, square 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 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 UNC 1/4-20 thread has 20 threads per inch; the feed is 1.27 mm/rev.
1/4-20 UNC machine tap for stainless steel, through holes
High quality 1/4-20 UN machine tapC with a reinforced shank, compliant with DIN 371. Designed for cutting American Unified coarse threads – UNC. The tolerance class of the finished threads is 2B, with a triangular thread profile and a 60° angle. Chamfer type BC – for through holes of various lengths in short-chipping materials.
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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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