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Description
Technical data of machine tapping No 12-28 UNF
| Technical data | |
|---|---|
| nominal diameter d1 | No 12-28 |
| thread pitch P | 28 threads per inch |
| overall length l1 | 80 mm |
| flute length l2 | 15 mm |
| shank diameter d2 | 4 mm |
| square drive size a | 3 mm |
| tap drill diameter | 4.6 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 UNF No 12-28 tap has a reduced shank in accordance with DIN 374: diameter 4 mm, square 3 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 UNF No 12-28 thread has 28 threads per inch; the feed is approximately 0.907 mm/rev.
No 12-28 American Unified Fine UNF machine tap
No 12-28 machine tap American UNF. Advanced No 12-28 UNF machine tap by Narex for cutting American Unified Fine threads. These are inch-based UNF threads with a No 12-28 inch diameter and 28 threads per inch. Tap chamfer type C (2-3 P) – for short and long through and blind holes. The Unified thread machine taps offered in our store are manufactured in accordance with DIN 374, with a finished thread tolerance class of 2 B (medium accuracy class). Key advantages of these tools are their high resistance to demanding operating conditions and high cutting productivity. This reduces machining time per component, also lowering labor costs and improving utilization of available machine tools. These No 12-28 UNF machine taps are intended for both individual customers and large companies. They are suitable for machining unalloyed steels, metals, metal alloys, thermoplastics, and nonferrous metals.
Product accessories
Hand tap UNF No 12-28 DIN 2181/2 HSS Fra
Reference: 0000007820 In stock > 10 items
€7.89
€9.71 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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