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Description
Technical data for the UNEF 7/8-20 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UNEF 7/8-20 | |
| Thread Pitch P in Inches and mm | 20 threads per inch | 1.27 mm |
| Thread Diameter mm / Decimal | 22.23 mm / 0.875 in | |
| Outside Diameter d2 | 55 mm | |
| Thickness h1 | 16 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
Die UNEF 7/8-20 HSS – large inch threading die with an extra-fine pitch
UNEF 7/8-20 die is a specialized tool for cutting external threads to the American Extra Fine standard. Manufactured from high-speed steel (HSS) to DIN 22568, it cuts threads with a diameter of 7/8 inch (22.23 mm) and 20 threads per inch.
Key features of the UNEF 7/8-20 die
- Extra fine pitch of 20 TPI – fine pitch at a large diameter, guaranteeing stability and precise adjustment
- HSS construction – capable of machining steels with strengths up to 800 MPa and nonferrous metals
- Tolerance class 2A according to ANSI B1.1 – guaranteed accuracy for precision fits
- Thread profile angle 60° – compatibility with all fasteners in the Unified system
- DIN 22568 – dimensional reliability and compatibility with industrial die holders
UNEF 7/8 die is used in the aerospace industry, hydraulic power systems, and the production of precision machine assemblies. A diameter of 22.23 mm with 20 TPI is a solution for demanding joints resistant to self-loosening.
Frequently asked questions
A dimension of 7/8 inch equals 22.23 mm. The inch-to-millimeter conversion factor is 25.4 mm/inch. Calculation: 0.875 × 25.4 = 22.23 mm.
UNEF represents the finest pitch in the Unified family. UNC threads are coarse, UNF fine, and UNEF extra-fine. For a diameter of 7/8 inch: UNC has 9 TPI, UNF has 14 TPI, and UNEF reaches 20 TPI.
The Unified system also includes: UNC – coarse threads, UNF – fine threads, UNS – special nonstandard threads, and UN – threads with a constant count of 4, 6, 8, 12, 16, 20, 28, or 32 per inch.
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| 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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