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Description
Technical data for the 7/8-9 UNC machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 7/8-9 |
| thread pitch P | 9 threads per inch |
| overall length l1 | 140 mm |
| flute length l2 | 32 mm |
| shank diameter d2 | 18 mm |
| square drive size a | 14.5 mm |
| tap drill diameter | 19.5 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
Through-hole chamfer B 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. The chips curl into coils, break into short pieces, and exit the hole on the other side of the workpiece. The threads already cut stay clean because chips do not pass through them on their way upward. The UNC 7/8-9 tap has a reduced shank in accordance with DIN 374: diameter 18 mm, square 14.5 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 7/8-9 thread has 9 threads per inch; the feed is approximately 2.822 mm/rev.
7/8-9 UNC American machine tap
Modern 7/8-9 machine tap for cutting American Unified Coarse threads. Thread type UNC, diameter 7/8-9 threads per inch. The finished threads have tolerance class 2B and a triangular profile. Chamfer type B (3 – 5 P) – for tapping through holes in short-chipping materials. Our store offers high-quality Unified thread machine taps manufactured from special, durable HSSE cobalt high-speed steel. It offers high resistance to breakage, cracking, chipping, edge fracture, and other types of mechanical damage. In addition, machine taps of this grade resist wear and retain their hardness at high temperatures (up to 600°C). The taps' excellent cutting properties also increase machining productivity, significantly reducing working time and labor costs. They can be used to tap components made from materials designated P1.2 – P1.3.
Product accessories
Hand tap UNC 7/8-9 DIN 352/3 HSS 2B Fanar
Reference: 0000007808 In stock < 10 items
€107.89
€132.71 brutto
HSSE 19.5 cobalt metal drill bit DIN 338
Reference: 13301 In stock > 10 items
€19.74
€24.28 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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