Westward
Westward Hand Tap Set 3 PC HSS 1 1/8-7 H4 Limit
A three-piece high-speed steel hand tap set for cutting 1 1/8-7 UNC threads with an H4 limit
- TypeFractional
- 3-piece set provides complete threading solution
- High-speed steel construction resists wear during use
- UNC thread standard ensures compatibility with common fasteners
- H4 limit delivers precise fit for 1 1/8-7 threads
- Right-hand 4-flute design clears chips efficiently
Westward 1 1/8-7 UNC Tap Set
This three-piece high-speed steel set cuts right-hand UNC threads in a 1 1/8 inch diameter with seven threads per inch. The H4 limit and four-flute design suit general-purpose threading in steel and similar materials. Supplied as taper, plug and bottoming taps for complete hole preparation.
Installation notes and common issues
Start the taper tap square to the workpiece and use cutting fluid to reduce torque. A misaligned start or insufficient lubrication often causes chipped flutes or oversized threads. Clear chips frequently, especially in deeper holes, to avoid binding the flutes.
Behaviour under sustained use
High-speed steel retains hardness during repeated cuts but generates more heat than cobalt alternatives. In long production runs the bright finish may gall without ample coolant. Flank wear increases gradually, so check thread gauge fit periodically to maintain the H4 tolerance.
Highlights
- 3-piece set provides complete threading solution
- High-speed steel construction resists wear during use
- UNC thread standard ensures compatibility with common fasteners
- H4 limit delivers precise fit for 1 1/8-7 threads
- Right-hand 4-flute design clears chips efficiently
Specifications
| Brand | Westward |
|---|---|
| Type | Fractional |
Questions about this item
How can I verify the tap is cutting threads correctly after setup?
Check that the threads match the 1 1/8-7 UNC specification and inspect for clean, consistent cuts across the 2 9/16 inch thread length using a matching nut or thread gauge.
What comes in the package and what additional items are needed?
The set includes three high-speed steel taps with H4 limit, four flutes, and 5 7/16 inch overall length; you will need a tap wrench, cutting fluid, and a correctly sized drill bit separately.
Which version should I choose for a standard right-hand UNC thread in this size?
This set is the H4 limit version for 1 1/8-7 UNC right-hand threads; select it when your application requires the standard H4 tolerance class for this thread size.
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