Description
Sutton Tools
Sutton HSS Hand Tap — 5/16-22 BSF Bottoming
Part No: T4680794 | Barcode: 9311963011974 | Brand: Sutton Tools
Sutton premium high-speed steel hand tap for cutting internal threads in steel, cast iron, brass, aluminium and most engineering metals. Ground from solid HSS with a bright finish and ISO529 straight flutes for accurate, repeatable threads. This 5/16-22 BSF Bottoming variant covers the BSW / BSF Whitworth thread standard — British Standard Whitworth (55° flank angle) — the original imperial thread, still common on vintage British motorcycles, plant equipment, and pre-metric Australian machinery.
HSS Material
Ground From Solid
ISO529 Straight Flute
Bright Finish
6H Tolerance
Hand or Machine Use
Key Features & Benefits
- M2 High-Speed Steel construction — long edge life cutting steel up to 1000 N/mm² without premature dulling.
- Ground from solid — Sutton’s signature ground-from-solid process delivers concentric flutes and consistent thread form.
- ISO529 straight flute — industry-standard geometry suits both hand tapping and powered use in most engineering metals.
- 6H tolerance class — produces a class-fit thread that mates accurately with standard fasteners.
- Australian made — manufactured at Sutton’s Thomastown plant — same family business that has supplied Australian trades since 1917.
When to Use This HSS Hand Tap
Use this tap when cutting accurate threads in tougher engineering metals — mild and tool steels, stainless, cast iron, brass, aluminium and bronze — where carbon-steel taps would dull quickly. The taper lead-in makes it the natural starter tap; follow with the intermediate (second) and bottoming (plug) tap from the same series for blind holes. This particular variant (T4680794) cuts a 5/16-22 BSF Bottoming thread.
Pro Tip: Use a quality cutting fluid (Sutton recommends sulphurised oil for steels and a wax stick or kerosene for aluminium) and back the tap off a quarter-turn every one to two full turns to break the chip — this prevents heat build-up and stops the flutes packing up in deeper holes.
Authorised Sutton Tools Dealer — This product is sourced directly from Sutton Tools Australia, an Australian-owned family business manufacturing cutting tools in Thomastown, Victoria since 1917, and is backed by full Australian manufacturer warranty and local support.
Product Specifications
| Part No. | Size / Pitch | Thread | Form | Barcode |
|---|---|---|---|---|
| T4510318 | 1/8-40 | BSW | Taper | 9311963003825 |
| T4510397 | 5/32-32 | BSW | Taper | 9311963003252 |
| T4510476 | 3/16-24 | BSW | Taper | 9311963000725 |
| T4510635 | 1/4 | BSW | Taper | 9311963000589 |
| T4510794 | 5/16-18 | BSW | Taper | 9311963002613 |
| T4510953 | 3/8-16 | BSW | Taper | 9311963002620 |
| T4511111 | 7/16 | BSW | Taper | 9311963012629 |
| T4511270 | 1/2-12 | BSW | Taper | 9311963003368 |
| T4511588 | 5/8-11 | BSW | Taper | 9311963004730 |
| T4520318 | 1/8 | BSW | Intermediate | 9311963003009 |
| T4520397 | 5/32-32 | BSW | Intermediate | 9311963003207 |
| T4520476 | 3/16-24 | BSW | Intermediate | 9311963000985 |
| T4520556 | 7/32-24 | BSW | Intermediate | 9311963028088 |
| T4520635 | 1/4-20 | BSW | Intermediate | 9311963001180 |
| T4520794 | 5/16 | BSW | Intermediate | 9311963002187 |
| T4520953 | 3/8-16 | BSW | Intermediate | 9311963002170 |
| T4521270 | 1/2 | BSW | Intermediate | 9311963003771 |
| T4521588 | 5/8 | BSW | Intermediate | 9311963005065 |
| T4530318 | 1/8-40 | BSW | Bottoming | 9311963002903 |
| T4530397 | 5/32-32 | BSW | Bottoming | 9311963003016 |
| T4530476 | 3/16-24 | BSW | Bottoming | 9311963001128 |
| T4530635 | 1/4-20 | BSW | Bottoming | 9311963000800 |
| T4530794 | 5/16-18 | BSW | Bottoming | 9311963001845 |
| T4530953 | 3/8-16 | BSW | Bottoming | 9311963002088 |
| T4531270 | 1/2 | BSW | Bottoming | 9311963002798 |
| T4531905 | 3/4 | BSW | Bottoming | 9311963007625 |
| T4532223 | 7/8 | BSW | Bottoming | 9311963018126 |
| T4660635 | 1/4-26 | BSF | Taper | 9311963011431 |
| T4660794 | 5/16-22 | BSF | Taper | 9311963016863 |
| T4660953 | 3/8-20 | BSF | Taper | 9311963014012 |
| T4661111 | 7/16-28 | BSF | Taper | 9311963028101 |
| T4661588 | 5/8-14 | BSF | Taper | 9311963030968 |
| T4670476 | 3/16-32 | BSF | Intermediate | 9311963013305 |
| T4670635 | 1/4-26 | BSF | Intermediate | 9311963009681 |
| T4670794 | 5/16-22 | BSF | Intermediate | 9311963019482 |
| T4670953 | 3/8-20 | BSF | Intermediate | 9311963013312 |
| T4671111 | 7/16-18 | BSF | Intermediate | 9311963025933 |
| T4671270 | 1/2 | BSF | Intermediate | 9311963016870 |
| T4680635 | 1/4-26 | BSF | Bottoming | 9311963008899 |
| T4680794 ★ | 5/16-22 | BSF | Bottoming | 9311963011974 |
| T4680953 | 3/8-20 | BSF | Bottoming | 9311963013329 |
| T4681111 | 7/16-18 | BSF | Bottoming | 9311963024103 |
| T4681270 | 1/2-16 | BSF | Bottoming | 9311963020839 |
★ You are viewing the highlighted variant. Other sizes in this series are also available.
Browse our full range of taps & dies at Alltools Geelong.
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