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Description
Technical data for the 1 1/4-12 UNF machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 1.1/4-12 |
| thread pitch P | 12 threads per inch |
| overall length l1 | 150 mm |
| flute length l2 | 27 mm |
| working length l3 | 22 mm |
| shank diameter d2 | 22 mm |
| square drive size | 18 mm |
| tap drill diameter | 29.5 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 1.1/4-12 tap has a reduced shank in accordance with DIN 374: diameter 22 mm, square 18 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 1.1/4-12 thread has 12 threads per inch; the feed is approximately 2.117 mm/rev.
1 1/4-12 UNF American machine tap
Professional 1 1/4-12 UNF machine tap manufactured in accordance with DIN 374. Intended for machine tapping Unified Fine UNF threads with a diameter of 1.1/4 inch and 12 threads per inch. The finished thread tolerance class is 2B. Chamfer type C – for tapping blind and through holes with a long thread runout. The Unified thread machine taps offered in our store are manufactured to the highest precision from special HSSE high-speed steel (High Speed Steel Cobalt).
The properties of this steel expand machining capabilities even for difficult-to-machine materials. In particular 1 1/4-12 UNF machine taps made from HSSE steel are harder and more durable. They also offer greater wear resistance and higher machining productivity. These properties make the taps less susceptible to mechanical damage (breakage, cracking, chipping, dulling), allowing a longer service life. In addition, they withstand the high temperatures generated during high-speed machining.
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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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