Westward
Westward Hand Tap Set HSS 5/16-18 H3 Limit PK3
High-speed steel fractional tap set cuts 5/16-18 UNC threads with H3 limit in a pack of three
- TypeFractional
- High-speed steel resists wear during repeated threading
- H3 limit fits standard UNC 5/16-18 holes
- Four flutes clear chips for smoother cuts
- Bright finish prevents coating buildup in threads
- Three-piece set covers taper plug and bottoming taps
Fractional tap set for 5/16-18 UNC threads
This Westward hand tap set cuts standard UNC threads in a 5/16 inch by 18 pitch size. The package contains three high-speed steel taps with a bright uncoated finish. Each tap measures 1 1/8 inches in thread length and 2 23/32 inches overall. The tools are designed for right-hand threading in general-purpose applications.
H3 thread limit controls fit class
The set is manufactured to an H3 thread limit, which determines the pitch diameter tolerance and the resulting class of fit. This limit is the single specification that decides whether the taps produce threads that meet the required gauge for a given job. Selecting the correct H limit ensures the internal threads assemble properly with mating fasteners.
Four-flute design manages chips in hand use
Each tap features four flutes that provide chip clearance during manual operation. The high-speed steel construction resists wear when cutting ferrous and non-ferrous materials at hand-tapping speeds. The bright finish offers no coating lubricity, so cutting fluid is recommended to reduce friction and heat. Proper technique keeps power draw low and prevents tap breakage.
Highlights
- High-speed steel resists wear during repeated threading
- H3 limit fits standard UNC 5/16-18 holes
- Four flutes clear chips for smoother cuts
- Bright finish prevents coating buildup in threads
- Three-piece set covers taper plug and bottoming taps
Specifications
| Brand | Westward |
|---|---|
| Type | Fractional |
Questions about this item
What does the 5/16-18 size mean when I am cutting threads in a real workpiece?
The tap cuts a 5/16 inch diameter thread with 18 threads per inch to the UNC standard, producing a standard coarse thread used in many inch‑based assemblies.
How does the H3 thread limit affect the fit of the finished thread?
H3 is a standard ground‑thread limit that yields a class 2B fit, giving normal clearance for bolts and nuts without oversize or undersize deviation.
What physical space do I need to accommodate the tap’s overall length of 2 23/32 in?
The tap measures 2 23/32 inches overall with a 1 1/8 inch thread length, so the holder and workpiece must allow at least that depth for full engagement.
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