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Description
Technical data for the UNF 7/8-14 left-hand die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UNF 7/8-14 LH | |
| Thread Pitch P in Inches and mm | 14 threads per inch | 1.81 mm |
| Thread Diameter mm / Decimal | 22.23 mm / 0.875 in | |
| Outside Diameter d2 | 55 mm | |
| Thickness h1 | 16 mm | |
| Number of Chip Holes | 5 | |
| Required Shaft Diameter | 22.05 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
Die UNF 7/8-14 left-hand HSS – durable tool for large left-hand fine threads
UNF 7/8-14 left-hand die is used to cut left-hand external threads with a diameter of 7/8 inch (22.23 mm) and a pitch of 14 threads per inch. The UNF (Unified National Fine) system provides 56% more threads than its UNC 7/8-9 counterpart, resulting in significantly greater load capacity. The left-hand thread prevents self-loosening in heavy-duty rotating equipment.
Key features of the left-hand UNF 7/8-14 die
- Left-hand thread (LH – left hand) – for heavy-duty mechanisms rotating clockwise
- Pitch of 14 threads/inch – a 56% finer pitch than UNC 7/8-9
- Diameter of 22.23 mm – for turbines, power units, and industrial spindles
- HSS high-speed steel – machining structural and alloy steels with tensile strengths up to 800 MPa
- DIN 22568 – European standard for quality and accuracy
The tool is used in turbines, generator sets, heavy-duty machine tool spindles, and the power industry. The UNF fine thread minimizes the risk of loosening under extreme loads.
Frequently asked questions
A diameter of 7/8 inch equals 22.23 mm. Calculation: 0.875 × 25.4 mm = 22.225 mm ≈ 22.23 mm.
UNF has 14 threads per inch, while UNC has only 9. The difference is 5 threads, meaning UNF has a 56% higher thread density.
For turbines, power units, heavy-duty machine tool spindles, and power equipment requiring a left-hand thread.
Product accessories
Hand Tap UNF 7/8-14 LH DIN 2181/2 HSS 2B
Reference: 0000003913 In stock > 10 items
€31.58
€38.84 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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