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Description
Technical data for the UN 1 1/4-8 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UN 1 1/4-8 | |
| Thread Pitch P in Inches and mm | 8 threads per inch | 3.17 mm |
| Thread Diameter mm / Decimal | 31.75 mm / 1.25 in | |
| Outside Diameter d2 | 65 mm | |
| Thickness h1 | 25 mm | |
| Number of Chip Holes | 7 | |
| Required Shaft Diameter | 31.43 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
UN 1 1/4-8 HSS die – inch die for constant-pitch threads
UN 1 1/4-8 die is a professional tool for cutting external threads to the American constant-pitch standard. Made of high-speed steel (HSS) in accordance with DIN 22568, the tool provides precise threading with a diameter of 1 1/4 inch (31.75 mm) and a pitch of 8 threads per inch on rods, shafts, and large structural components.
Key benefits of the UN 1 1/4-8 inch die
- Constant-pitch thread with 8 TPI – universal standard applied regardless of diameter, simplifying tool and fastener selection
- Highly durable HSS steel – enables machining of structural steels up to 800 MPa, aluminum, and brass
- Tolerance 2A in accordance with ANSI B1.1 – standard accuracy class ensuring proper fit with American screws
- Thread angle 60° – provides high mechanical strength of the threaded joint
- Compliance with DIN 22568 – verified manufacturing quality and dimensional repeatability
UN 1 1/4 die is suitable for heavy industry and for servicing American-made construction machinery and large equipment. Constant-pitch UN threads are selected where fastener standardization is required. Order this essential tool for working with large-diameter inch threads.
Frequently asked questions
The dimension 1 1/4 inch corresponds to 31.75 mm. The conversion factor is 25.4 mm per inch. Multiplying 1.25 by 25.4 gives the value in millimeters.
UN has a constant thread count regardless of diameter, while UNC and UNF have different pitches for different sizes. The designation UN 8 always means 8 threads per inch, whereas in the UNC/UNF systems the thread count changes with diameter.
The UN system offers constant-pitch threads with 4, 6, 8, 12, 16, 20, 28, and 32 threads per inch. The specific pitch is selected based on the joint's load capacity and accuracy requirements.
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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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