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Description
Technical data for the 1/2-20 UNF machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 1/2-20 |
| thread pitch P | 20 threads per inch |
| overall length l1 | 100 mm |
| flute length l2 | 15 mm |
| shank diameter d2 | 9 mm |
| square drive size | 7 mm |
| tap drill diameter | 11.5 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 UNF 1/2-20 tap has a reduced shank to DIN 374: diameter 9 mm, square 7 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 UNF 1/2-20 thread has 20 threads per inch; the feed is 1.27 mm/rev.
1/2-20 UNF American machine tap for stainless steel
High quality 1/2-20 UNF machine tap with an extended shank for cutting Unified fine threads UNF, inch thread size 1/2-20 UNF, 20 threads per inch. These are inch threads with a triangular profile and a 60° profile angle. The tolerance class of the finished threads is 2B, chamfer type B – for through and blind holes with a long thread runout.
These 1/2-20 UNF fine-thread machine taps for Unified threads are manufactured to DIN 374 from special high-grade high-speed steel HSSE. This material allows substantially higher cutting parameters than those achievable with conventional tool steel. Above all, HSSE machine taps withstand demanding cutting conditions and allow very hard materials to be machined at very high speeds. Even at the elevated temperatures generated, the tap cutting edges resist breakage, cracking, chipping and edge fracture. They are suitable for machining unalloyed steels, metals, metal alloys and plastics.
Product accessories
Hand tap UNF 1/2-20 DIN 2181/2 HSS 2B Fra
Reference: 0000007807 In stock > 10 items
€13.16
€16.18 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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