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Description
Technical data for the 5/16-18 UNC machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 5/16-18 |
| thread pitch P | 18 threads per inch |
| overall length l1 | 90 mm |
| flute length l2 | 13 mm |
| working length l3 | 35 mm |
| shank diameter d2 | 8 mm |
| square drive size | 6.2 mm |
| tap drill diameter | 6.6 mm |
| Chamfer | C (2÷3) P |
Where chips remain in a straight-flute tap
The flute holds the chips until the tap is reversed out
The straight flute runs parallel to the tap axis. There is no helix to carry chips upward. The chamfer cutting edges are not ground at an angle, so they do not push chips downward. Short chips break into fragments and remain in the flute beside the cutting edges that produced them. They leave the hole only when the tap is reversed out. The UNC 5/16-18 tap has a reinforced shank in accordance with DIN 371: diameter 8 mm, square 6.2 mm.
1
Straight flute – chips remain in the flute, next to the cutting edges that produced them.
2
Chamfer C: 2–3 incomplete threads on the tapered lead.
3
The tap rotates clockwise to cut a right-hand thread.
4
Individual fragments exit at the top, onto the workpiece surface.
5
A few fragments fall below the tip and exit through the bottom of the hole.
6
The UNC 5/16-18 thread has 18 threads per inch; the feed is approximately 1.411 mm/rev.
5/16-18 UNC American machine tap for stainless steel
High quality 5/16-18 UN machine tapC with a reinforced shank, compliant with DIN 371. Intended for cutting American Unified Coarse threads – UNC, diameter 5/15, 18 threads per inch. The finished threads have tolerance class 2B and a triangular profile with a 60° angle. Chamfer type C – for through and blind holes of various lengths in short-chipping materials. Our 5/16-18 machine taps for Unified threads are intended for individual customers and large manufacturing facilities. The tools feature high-quality construction from advanced high-speed steel with 5% cobalt added – HSSE. This steel offers excellent cutting properties. The 5/16-18 UNC machine taps made from this steel are suitable for machining even very hard and difficult-to-machine materials (cast steel, gray cast iron, ductile cast iron, alloy steel up to 800 MPa, heat-resistant steel, acid-resistant steel). The tap cutting edges resist breakage, cracking, and chipping, ensuring a long tool life.
Product accessories
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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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