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Description
Technical data for the 7/8-14 UNF machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 7/8-14 |
| thread pitch P | 14 threads per inch |
| overall length l1 | 125 mm |
| flute length l2 | 24 mm |
| working length l3 | 17 mm |
| shank diameter d2 | 18 mm |
| square drive size | 14.5 mm |
| tap drill diameter | 20.4 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 7/8-14 tap has a reduced shank in accordance with DIN 374: diameter 18 mm, square 14.5 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 7/8-14 thread has 14 threads per inch; the feed is approximately 1.814 mm/rev.
7/8-14 UNF American machine tap for stainless steel
Professional 7/8-14 UNF machine tap with a reduced shank, compliant with DIN 374. Suitable for machine cutting American Unified threads. These are UNF fine threads, 7/8 inch in diameter, with 14 threads per inch. The threads have a triangular profile with a 60° angle. Chamfer type C – for blind and through holes with a long thread runout. The tolerance class of the finished threads is 2B. The offered 7/8-14 UNF machine taps Unified taps are manufactured to the highest precision from special cobalt high-speed steel HSSE (High Speed Steel).
This specialized tool steel offers high abrasion resistance even at the elevated temperatures (up to 600°C) generated during high-speed machining. As a result, these taps rarely suffer mechanical damage such as breakage, cracking, edge chipping, spalling or even dulling. They are suitable for machining unalloyed steels, metals, nonferrous metals, metal alloys and other materials.
Product accessories
Hand Tap UNF 7/8-14 DIN 2181/2 HSS 2B
Reference: 0000006234 In stock > 10 items
€23.68
€29.13 brutto
Drill 20.5 Cobalt NWKc HSSE DIN 345
Reference: 0000008560 In stock < 10 items
€35.53
€43.70 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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