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Description
Technical data for the UNF 1/4-28 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UNF 1/4-28 | |
| Thread Pitch P in Inches and mm | 28 threads per inch | 0.91 mm |
| Thread Diameter mm / Decimal | 6.35 mm / 0.25 in | |
| Outside Diameter d2 | 20 mm | |
| Thickness h1 | 7 mm | |
| Number of Chip Holes | 4 | |
| Required Shaft Diameter | 6.24 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
Die UNF 1/4-28 HSS – a popular tool for fine threads
UNF 1/4-28 die is used to cut external threads with a diameter of 1/4 inch (6.35 mm) and 28 threads per inch. The UNF (Unified National Fine) fine-thread standard offers as many as 40% more threads than its UNC 1/4-20 counterpart, providing significantly higher load capacity and better vibration resistance. HSS construction ensures tool durability.
Key benefits of the UNF 1/4-28 die
- Fine pitch of 28 threads/inch – 40% more threads than UNC 1/4-20
- Diameter of 6.35 mm – one of the most popular inch sizes
- HSS high-speed steel – for materials with a strength of up to 800 MPa
- Conforms to DIN 22568 – European standard for quality and precision
- 60° profile – fully compatible with the Unified National system
The tool is used in hydraulics, pneumatics, automotive applications, and servicing American machinery. The UNF 1/4-28 fine thread provides better connection sealing than its coarse-thread counterpart.
Frequently asked questions
A diameter of 1/4 inch equals 6.35 mm. Conversion: 0.25 × 25.4 mm = 6.35 mm.
UNF has 28 threads/inch, while UNC has only 20. The fine thread has a 40% higher thread count (8 more threads).
For hydraulics, pneumatics, automotive applications, and wherever sealing and vibration resistance are required.
Product accessories
Thread ring gauge UNF 1/4-28 2A GO NO-GO
Reference: 15411 In stock > 10 items
€50.00
€61.50 brutto
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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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