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Description
Technical data for the 1 3/8-12 UNF machine tap
| Technical data | |
|---|---|
| nominal diameter d1 | 1 3/8-12 |
| thread pitch P | 12 threads per inch |
| overall length l1 | 170 mm |
| flute length l2 | 30 mm |
| working length l3 | 22 mm |
| shank diameter d2 | 28 mm |
| square drive size | 22 mm |
| tap drill diameter | 32.8 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 1.3/8-12 tap has a reduced shank in accordance with DIN 374: diameter 28 mm, square 22 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 1.3/8-12 thread has 12 threads per inch; the feed is approximately 2.117 mm/rev.
1 3/8-12 UNF American machine tap for stainless steel
Professional 1 3/8-12 UNF machine tap with a pass-through shank, compliant with DIN 374, for cutting internal Unified Fine threads of the UNF type. Thread diameter 1 and 3/8 inch, 12 threads per inch. Our fine-thread machine taps have chamfer C – for tapping through and blind holes in short-chipping materials.
Triangular thread profile with a 60° angle. The Unified thread machine taps offered in our store are manufactured from advanced tool steel. This special HSSE high-speed steel features high wear resistance and high resistance to other potential mechanical damage during high-speed tapping. These 1 3/8-12 UNF machine taps also enable high cutting productivity, thereby reducing working time and improving utilization of available machine tools. The taps are intended for machining unalloyed steels, metals, metal alloys, and plastics.
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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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