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Description
Technical data for the UNF No 6-40 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UNF No 6-40 | |
| Thread Pitch P in Inches and mm | 40 threads per inch | 0.64 mm |
| Thread Diameter mm / Decimal | 3.51 mm / 0.138 in | |
| Outside Diameter d2 | 20 mm | |
| Thickness h1 | 5 mm | |
| Number of Chip Holes | 3 | |
| Required Shaft Diameter | 3.42 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
Die UNF No 6-40 HSS – a precision tool for fine inch threads
UNF No 6-40 die is used to cut external threads with a No 6 diameter (3.51 mm) and 40 threads per inch. The UNF (Unified National Fine) fine-thread standard provides 25% more threads than its UNC No 6-32 counterpart, resulting in more precise adjustment and a stronger connection. The HSS material ensures high durability.
Key features of the No 6-40 UNF die
- Fine pitch of 40 threads/inch – a more precise connection than UNC No 6-32
- Diameter of 3.51 mm – for electronics, automation, and precision mechanisms
- High-speed steel (HSS) for materials up to 800 MPa – effective machining of steel and nonferrous alloys
- DIN 22568 – verified quality and dimensional accuracy
- Unified National system – full compliance with ANSI B1.1 standards
The tool is used in measuring instrument manufacturing, industrial electronics, and precision engineering. The finer UNF pitch provides better vibration resistance than the UNC coarse thread.
Frequently asked questions
Calculation: 0.060" + (6 × 0.013") = 0.138" × 25.4 = 3.51 mm. Size No 6 measures 3.51 mm.
UNF has 40 threads/inch, and UNC has 32 threads/inch. The difference is 8 threads, meaning UNF is 25% finer.
In electronics, industrial automation, precision engineering, and measuring instruments.
Product accessories
Hand tap UNF No 6-40 DIN 2181/2 HSS Fra
Reference: 0000007818 In stock > 10 items
€7.11
€8.74 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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