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Description
Technical data for the left-hand UNS 3/4-27 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UNS 3/4-27 LH | |
| Thread Pitch P in Inches and mm | 27 threads per inch | 0.94 mm |
| Thread Diameter mm / Decimal | 19.05 mm / 0.75 in | |
| Number of Chip Holes | 5 | |
| Required Shaft Diameter | 19.0 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
Die UNS 3/4-27 LH HSS 3A – special left-hand inch die with enhanced precision
Die UNS 3/4-27 LH is a specialized tool for cutting left-hand external threads with a nonstandard pitch in the American Unified National Special system. Made of high-speed steel (HSS) in accordance with DIN-EN 22568, it cuts left-hand threads with a diameter of 3/4 inch (19.05 mm), a pitch of 27 threads per inch, and a tighter tolerance class of 3A.
Key advantages of the left-hand UNS 3/4-27 die
- Left-hand thread (LH) – thread direction opposite to standard, preventing self-loosening in rotating mechanisms
- Tighter tolerance class 3A – the highest accuracy grade for precision fits requiring minimal clearance
- Nonstandard pitch of 27 TPI – special thread density outside the standard inch series
- HSS high-speed steel – durability when machining structural steels up to 800 MPa and non-ferrous metals
- DIN-EN 22568 standard – European quality assurance and compatibility with industrial die holders
Left-hand die UNS 3/4 is used in machine tool spindles, screw drives, and differential mechanisms. The combination of a left-hand thread with tolerance class 3A and a pitch of 27 TPI ensures maximum precision and joint stability in demanding applications.
Frequently asked questions
A diameter of 3/4 inch corresponds to 19.05 mm. The conversion factor is 25.4 mm per inch. Calculation: 0.75 × 25.4 = 19.05 mm.
UNS (Unified National Special) is a thread with a nonstandard combination of diameter and pitch. For a size of 3/4 inch, the standard values are: UNC 10 TPI, UNF 16 TPI, UNEF 20 TPI. A pitch of 27 TPI does not fall within any of these series, hence the UNS designation.
The Unified system also includes: UNC – coarse threads, UNF – fine threads, UNEF – extra fine threads, and UN – constant-pitch threads with 4, 6, 8, 12, 16, 20, 28, or 32 threads per inch.
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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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