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Description
Technical data for the UNC No 4-40 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UNC No 4-40 | |
| Thread Pitch P in Inches and mm | 40 threads per inch | 0.64 mm |
| Thread Diameter mm / Decimal | 2.85 mm / 0.112 in | |
| Outside Diameter d2 | 20 mm | |
| Thickness h1 | 5 mm | |
| Number of Chip Holes | 3 | |
| Required Shaft Diameter | 3.09 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
Die UNC No 4-40 HSS – miniature inch thread for precision electronics
UNC No 4-40 die is designed for cutting small external threads with a diameter of No 4 (2.84 mm) and a fine pitch of 40 threads per inch. This size is typical of American electronics, measuring instruments, and precision mechanisms. HSS provides durability when machining delicate components.
Features of the No 4-40 American-standard die
- Miniature diameter of 2.84 mm – ideal size for screws in electronics
- Fine pitch of 40 threads per inch – precision joint with high accuracy
- HSS material – effective threading of nonferrous metals and steels up to 800 MPa
- Conforms to DIN 22568 – standardized external die dimension
- 60° thread profile – profile characteristic of Unified threads
A die designed for electronics repair shops, laboratories, and manufacturers of test and measurement equipment. It guarantees accuracy and repeatability when threading small diameters.
Frequently asked questions
The No 4 thread has a diameter of 2.84 mm (0.112 inch). Conversion factor: 1 inch = 25.4 mm. Example: 0.112 × 25.4 = 2.84 mm.
The Unified family also includes: UNF – fine threads, UNEF – extra-fine threads, UNS – special threads, and UN – constant-pitch threads with 4, 6, 8, 12, 16, 20, 28, or 32 threads per inch.
UNC has a coarser pitch and fewer threads per inch than UNF. Size No 4 has 40 threads per inch in UNC and 48 threads per inch in UNF. Identification is performed using inch thread gauges.
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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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