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Description
Technical data for the UNEF 1 1/8-18 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UNEF 1 1/8-18 | |
| Thread Pitch P in Inches and mm | 18 threads per inch | 1.41 mm |
| Thread Diameter mm / Decimal | 28.58 mm / 1.125 in | |
| Outside Diameter d2 | 65 mm | |
| Thickness h1 | 18 mm | |
| Number of Chip Holes | 6 | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |

Die UNEF 1 1/8-18 HSS – large extra fine inch threading die
Die UNEF 1 1/8-18 is a professional tool for cutting large external threads to the American Extra Fine standard. Manufactured from high-speed steel (HSS) in accordance with DIN 22568, it cuts threads with a diameter of 1 1/8 inch (28.58 mm) and 18 threads per inch.
Main advantages of the UNEF 1 1/8-18 die
- Extra fine pitch, 18 TPI – fine pitch at a large diameter for precision and vibration resistance
- HSS material – capable of machining steels with strength up to 800 MPa, as well as aluminum and brass
- Class 2A accuracy per ANSI B1.1 – standard tolerance class for industrial fits
- Thread profile angle 60° – compatibility with Unified system fasteners
- DIN 22568 – assured dimensions and fit in large die stocks
Die UNEF 1 1/8 is used in the aerospace industry, hydraulic power systems, and the manufacture of precision machine assemblies. The 28.58 mm diameter with a pitch of 18 TPI is a solution for demanding connections with large cross sections.
Frequently asked questions
A diameter of 1 1/8 inch corresponds to 28.58 mm. The conversion factor is 25.4 mm per inch. Calculation: 1.125 × 25.4 = 28.58 mm.
UNEF (Extra Fine) has the finest pitch among Unified standards. UNC is a coarse thread, UNF is fine, and UNEF is extra fine. For a size of 1 1/8 inch: UNC has 7 TPI, UNF has 12 TPI, and UNEF has 18 TPI.
The Unified family also includes: UNC – the coarse variant, UNF – the fine variant, UNS – special threads, and UN – constant-pitch series: 4, 6, 8, 12, 16, 20, 28, or 32 threads per inch.
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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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