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Description
Technical data of machine tapping No 6-40 UNF
| Technical data | |
|---|---|
| thread pitch P | 40 threads per inch |
| overall length l1 | 56 mm |
| flute length l2 | 11 mm |
| shank diameter d2 | 2.5 mm |
| square drive size a | 2.1 mm |
| tap drill diameter | 2.95 mm |
| Chamfer | C (6÷8) 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 6-40 tap has a reduced shank in accordance with DIN 374: diameter 2.5 mm, square 2.1 mm.
1
Straight flute – chips remain in the flute, next to the cutting edges that produced them.
2
Chamfer C: 6–8 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 6-40 thread has 40 threads per inch; the feed is 0.635 mm/rev.
No 6-40 UNF American machine tap for stainless steel
High quality No 6-40 UNF machine tap for cutting American Unified Fine UNF No 6-40 threads. Chamfer type C – for short through holes. The Unified thread machine taps we sell are manufactured in accordance with DIN 374. They are made from advanced HSSE cobalt high-speed steel. Its excellent cutting properties translate directly into high tapping performance. In particular, these No 6-40 UNF machine taps allow increased cutting productivity and precision. They also withstand demanding operating conditions, particularly high temperatures (up to 600°C). They rarely suffer mechanical damage such as breakage, cracking, chipping, edge nicking, or even dulling. These advantages provide a very long tap service life, reducing machining costs. The taps are suitable for machining materials in classes P1.2 – P1.3
Product accessories
Hand tap UNF No 6-40 DIN 2181/2 HSS Fra
Reference: 0000007818 In stock > 10 items
€7.11
€8.74 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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