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Description
Technical data for the No 2-56 UNC machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | No 2-56 |
| thread pitch P | 56 threads per inch |
| overall length l1 | 45 mm |
| flute length l2 | 10 mm |
| working length l3 | 13 mm |
| shank diameter d2 | 2.8 mm |
| square drive size | 2.1 mm |
| tap drill diameter | 1.85 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. It has 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 backed out. The UNC No 2-56 tap has a reinforced shank according to DIN 371: diameter 2.8 mm, square size 2.1 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 No 2-56 thread has 56 threads per inch; the feed is approximately 0.454 mm/rev.
No 2-56 UNC American machine tap for stainless steel
No 2-56 UNC machine tap with a reinforced shank for cutting UNC Unified coarse threads with a standard pitch. Thread diameter 2.18 mm, 56 threads per inch, medium-accuracy tolerance class – 2B. Form C chamfer – for through holes and blind holes in materials producing short chips. Triangular thread profile with a 60° angle. These No 2-56 UNC machine taps for Unified threads are manufactured according to DIN 371 from special high-grade HSSE high-speed steel. This exceptional tool steel contains 5% cobalt as a key constituent. The addition of this element makes our taps highly resistant to wear, even at the high temperatures generated during high-speed cutting. The cutting edges resist mechanical damage (breakage, cracking, chipping, edge fracture, dulling). The tools can be used to machine very hard materials in classes P1.2 – P1.5 (alloy steels, stainless steels, acid-resistant steels, cast iron, cast steel)
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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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