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Description
Technical data for the UN 5/16-28 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UN 5/16-28 | |
| Thread Pitch P in Inches and mm | 28 threads per inch | 0.91 mm |
| Thread Diameter mm / Decimal | 7.94 mm / 0.3125 in | |
| Outside Diameter d2 | 25 mm | |
| Thickness h1 | 9 mm | |
| Number of Chip Holes | 4 | |
| Required Shaft Diameter | 7.8 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
Die UN 5/16-28 HSS – an inch die with a constant pitch of 28 TPI
UN 5/16-28 die is a tool designed to cut external threads in the American constant-pitch system. Made of high-speed steel (HSS) to DIN 22568, it is used to cut threads with a diameter of 5/16 inch (7.94 mm) and 28 threads per inch on rods and precision components.
Advantages of the UN 5/16-28 inch die
- Constant pitch of 28 TPI – fine thread providing precise adjustment and joint stability
- HSS construction – durability when machining structural steels up to 800 MPa and non-ferrous metals
- Tolerance class 2A – compliance with ANSI B1.1 for standard thread fits
- 60° thread profile – full compatibility with Unified system fasteners
- DIN 22568 standard – guaranteed dimensions and compatibility with professional die stocks
UN 5/16-28 die is suitable for facilities manufacturing components for the automotive and aerospace industries. The 28 TPI pitch combines fine thread precision with the versatility of the UN standard. A tool for demanding technical applications.
Frequently asked questions
The 5/16 inch dimension equals 7.94 mm. The conversion is based on 1 inch = 25.4 mm. Calculation: 0.3125 × 25.4 = 7.94 mm.
The UN system uses a constant number of threads per inch regardless of thread diameter. UNC and UNF have variable pitches, with a different thread count for each size. UN 28 always has 28 threads per inch.
UN threads are available in constant pitches: 4, 6, 8, 12, 16, 20, 28, and 32 threads per inch. The specific pitch is selected according to the design requirements of the joint.
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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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