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Description
Technical data for the 5/16-24 UNF spiral flute machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 5/16-24 |
| thread pitch P | 24 threads per inch |
| overall length l1 | 90 mm |
| flute length l2 | 13 mm |
| shank diameter d2 | 8 mm |
| square drive size | 6.2 mm |
| tap drill diameter | 6.9 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 5/16-24 tap has a reduced shank in accordance with DIN 374: diameter 8 mm, square 6.2 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 5/16-24 thread has 24 threads per inch; the feed is approximately 1.058 mm/rev.
5/16-24 UNF American machine tap for blind holes
UNF 5/16-24 spiral-flute tap is designed for cutting American Unified fine threads in blind holes; in series production, it stabilizes cutting torque and surface quality, promoting tool life when used as a 5/16-24 fine-thread machine tap.
UNF 5/16-24 tap produces a sixty° profile in accordance with the American Society of Mechanical Engineers B1.1 standard; the five-sixteenths-inch diameter corresponds to 7.937 millimeters, and twenty-four threads per inch gives a pitch of 1.058 millimeters. Manufacture to the German Deutsches Institut für Normung 374 standard, form C (two–three-thread chamfer) and a forty° spiral flute direct chips upward, keeping the profile at the bottom of the hole clean. The cobalt-alloyed high-speed steel core provides increased hot strength; the uncoated version ensures predictable guidance and a consistent pitch diameter for fit class 2B. When selecting holders, compensation for misalignment and external coolant or minimum-quantity oil-mist lubrication are recommended, while the 5/16-24 blind-hole tap performs well in recesses with limited depth.
- Stable chip evacuation — the forty° helix reduces the risk of jamming and torque fluctuations.
- Uniform thread profile — form C limits material crushing near the bottom, supporting class 2B.
- Cutting edge durability — cobalt high-speed steel maintains sharpness across varying steel ductility.
- Dimensional repeatability — compliance with standards facilitates pitch diameter inspection and installation of 5/16-24 screws; 5/16-24 fine-thread machine tap minimizes the need for retapping.
Compliance: American Society of Mechanical Engineers B1.1 (5/16-24, class 2B); Deutsches Institut für Normung 374, form C; designed for machining steel with controlled surface roughness and predictable thread geometry.
Product accessories
UNF 5/16-24 HSS DIN 22568 Cztool tooling
Reference: 0000005623 In stock > 10 items
€6.84
€8.42 brutto
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Shipping
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| 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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