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Description
Technical data for the 1/2-20 UNF machine tap for through holes
| 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 | 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 1/2-20 tap has a reduced shank in accordance with DIN 374: diameter 9 mm, square 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 1/2-20 thread has 20 threads per inch; the feed is 1.27 mm/rev.
1/2-20 UNF American spiral-flute machine tap
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 C – 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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