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Description
Technical data for the UNF No 12-28 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UNF No 12-28 | |
| Thread Pitch P in Inches and mm | 28 threads per inch | 0.91 mm |
| Thread Diameter mm / Decimal | 5.49 mm / 0.216 in | |
| Outside Diameter d2 | 20 mm | |
| Thickness h1 | 7 mm | |
| Number of Chip Holes | 4 | |
| Required Shaft Diameter | 5.38 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
Die UNF No 12-28 HSS – a durable tool for precision threads
UNF No 12-28 die enables cutting of external threads with a No 12 diameter (5.49 mm) and 28 threads per inch. The UNF (Unified National Fine) fine-thread system provides 17% more threads than UNC No 12-24, ensuring a stronger connection and better sealing. The HSS material allows machining of materials up to 800 MPa.
Properties of the UNF No 12-28 die
- Pitch of 28 threads/inch – pitch finer than UNC No 12-24 by 17%
- Diameter of 5.49 mm – for automation, industrial electronics, and precision engineering
- HSS steel for materials up to 800 MPa – effective machining of structural steels and nonferrous alloys
- DIN 22568 – guaranteed dimensional accuracy and manufacturing quality
- Thread angle 60° – compatibility with the entire Unified thread family
The die is used in control and measuring instrument manufacturing, electronics, and precision engineering. The UNF fine thread minimizes the risk of loosening under vibration.
Frequently asked questions
Formula: 0.060" + (12 × 0.013") = 0.216" × 25.4 = 5.49 mm. Size No 12 measures 5.49 mm.
UNF has 28 threads/inch, and UNC has 24 threads/inch. The difference is 4 threads, meaning UNF has a 17% higher thread count.
In industrial electronics, automation, measuring instruments, and mechanisms requiring precision.
Product accessories
UNF No 12-28 DIN 374 C HSSE tapping tool
Reference: 0000006214 In stock < 10 items
€12.63
€15.54 brutto
Hand tap UNF No 12-28 DIN 2181/2 HSS Fra
Reference: 0000007820 In stock > 10 items
€7.89
€9.71 brutto
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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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