Westward
Westward Hand Tap Set 3 PC HSS 7/8-9 H4 Limit
A three-piece high-speed steel hand tap set for cutting 7/8-9 UNC threads to H4 tolerance
- TypeFractional
- 3-piece set covers taper, plug and bottoming operations
- High-speed steel resists wear in carbon and alloy steels
- H4 limit provides standard class-of-fit for 7/8-9 UNC threads
- Four flutes improve chip evacuation and thread finish
- Bright finish allows easy inspection of cutting edges
Westward 7/8-9 UNC Tap Set
This three-piece set contains fractional hand taps cut to a 7/8 inch diameter with nine threads per inch. Each tap is made from high-speed steel and follows the UNC thread standard with a right-hand thread direction. The H4 limit provides a standard fit for general-purpose threading tasks in maintenance or fabrication shops.
Sustained Threading Performance
High-speed steel construction resists wear when cutting multiple holes in steel or iron, allowing the taps to maintain geometry longer than carbon steel alternatives. Four flutes on each tap evacuate chips efficiently during continuous hand operation, reducing the risk of binding or tap breakage. The bright, uncoated finish suits lubricated cutting in standard workshop environments.
Build Quality and Daily Use
Each tap measures 2 7/32 inches in thread length and 4 11/16 inches overall, giving ample reach for through-holes and deeper blind holes. The fractional sizing matches common imperial fastener requirements without metric conversion. This set does not serve users needing metric threads, finer pitch options, or coated taps for high-temperature alloys or high-volume production runs.
Highlights
- 3-piece set covers taper, plug and bottoming operations
- High-speed steel resists wear in carbon and alloy steels
- H4 limit provides standard class-of-fit for 7/8-9 UNC threads
- Four flutes improve chip evacuation and thread finish
- Bright finish allows easy inspection of cutting edges
Specifications
| Brand | Westward |
|---|---|
| Type | Fractional |
Questions about this item
How much heat does the 7/8-9 HSS tap generate during extended threading?
The high-speed steel construction dissipates heat effectively during continuous cutting, and the bright uncoated finish reduces friction buildup when used with proper cutting fluid.
What tapping fluid or lubricant is required for the 7/8-9 UNC threads?
A standard cutting oil or tapping fluid compatible with high-speed steel is needed to achieve clean threads and extend tool life on the 7/8-9 UNC size.
Will the H4 limit taps fit existing 7/8-9 UNC nuts and threaded holes?
Yes, the H4 thread limit produces a standard class 2B fit, so threads cut with these taps will match existing 7/8-9 UNC hardware.
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