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Description
Technical data for the UNC 7/8-9 die
| Technical data | ||
|---|---|---|
| Nominal Diameter d1 Inches/mm/Decimal | UNC 7/8-9 | |
| Thread Pitch P in Inches and mm | 9 threads per inch | 2.82 mm |
| Thread Diameter mm / Decimal | 22.23 mm / 0.875 in | |
| Outside Diameter d2 | 55 mm | |
| Thickness h1 | 22 mm | |
| Number of Chip Holes | 4 | |
| Required Shaft Diameter | 22 mm | |
| Thread angle G | 60° | |
| Thread Standard | ANSI B-1.1 | |
UNC 7/8-9 HSS die – large inch thread for heavily loaded joints
UNC 7/8-9 die is designed for cutting external threads with a large diameter of 7/8 inch (22.23 mm). The pitch of 9 threads per inch provides high joint strength. This tool is essential for work on heavy equipment and steel structures.
Characteristics of the UNC 7/8-9 die
- Large diameter of 22.23 mm – for joints carrying substantial loads
- HSS high-speed steel – machining materials with a strength of up to 800 MPa
- Accuracy class 2A – compliance with ANSI B1.1 for inch threads
- DIN 22568 standard – dimensions allow mounting in industrial die stocks
- 9 threads per inch – optimum pitch for load-bearing joints
The die is used in heavy industry, agricultural machinery manufacturing, and service workshops handling American-made construction equipment. It provides secure and durable threaded joints.
Frequently asked questions
7/8 inch corresponds to 22.23 mm. Conversion factor: 1 inch = 25.4 mm. Calculation: 25.4 mm × 7 ÷ 8 = 22.23 mm.
Besides UNC, the Unified system 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 lower thread density than UNF. For the 7/8 inch size, UNC has 9 threads, while UNF has 14 threads per inch. Inch thread pitch gauges are used for identification.
Product accessories
Hand tap UNC 7/8-9 DIN 352/3 HSS 2B Fanar
Reference: 0000007808 In stock < 10 items
€107.89
€132.71 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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