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5/16" x 18 TPI UNC Coarse HSS Taper Straight Flute Hand Tap Alpha ISO 529 UNCHT516
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SKU: 14C516TA
In Stock
Other Sizes in Range
Delivery Information
Orders under $30 (Bulky items sent as parcel for FREE)
- Aust Post UNTRACKED Letter – FREE
- Parcel – From $8
- Express – From $10
- Click and Collect – 2hrs
Orders over $30
- Parcel – FREE
- Express – From $10
- Click and Collect – 2hrs
5% Off
10% Off
15% Off
| System of Measurement | Imperial |
|---|---|
| Product | Hand Tap |
| Product Types | Taper Tap |
| Size | 5/16" |
| Size & Thread Pitch | 5/16" x 18 TPI UNC |
| Thread Pitch | 18 TPI |
| Thread Direction | Right Hand |
| Material | High Speed Steel |
| Length (l) | 72mm |
| Chamfer | Taper |
| Tapping Drill Size | 6.60mm |
| Drive Square (ds) | 4.90mm |
| Closest size in mm | M8 (8mm) |
| Standard Made To | ISO529 |
| Packaging | Supplied in Plastic Pack |
| Country of Origin | Made in the Europe |
| Brand | Alpha |
Dimensional data is a guide only. Tolerance differences exist between brands and batches
About Taps
Taps are the cutting tools used to cut an internal thread in a pre-drilled hole. The Alpha and Sutton Tools range covers metric coarse and fine M1.6 through M24, plus imperial UNC, UNF, BSW, BSF and BSP threads. Form variants include Taper, Second / Intermediate, Bottoming (Plug), Spiral Point (Gun Tap) and Spiral Flute. High-speed-steel construction with HSSE V3 cobalt variants for harder materials.
Recommended use General steel, alloy, brass, aluminium and timber drilling. Most cost-effective option for everyday workshop and site work. Holds an edge for hundreds of holes in mild steel when used with cutting fluid.
Frequently Asked Questions
Taps are the standard way to add a thread to a plain hole - in metal, plastic or hardwood. Drill the hole to the correct tap drill size, then turn the tap clockwise to cut the thread. Reverse a half-turn every full turn to clear chips. The thread cut by the tap matches a standard machine screw thread.
For metric coarse: M3 needs a 2.5mm hole, M4 needs 3.3mm, M5 needs 4.2mm, M6 needs 5.0mm, M8 needs 6.8mm, M10 needs 8.5mm. For imperial UNC: 1/4-20 needs 13/64", 5/16-18 needs 17/64", 3/8-16 needs 5/16". Always check the chart - undersize hole snaps the tap, oversize hole cuts a weak thread.
On a through hole you only need a Taper or Second tap. On a blind hole you need all three in sequence. Spiral Point and Spiral Flute taps are machine-tap variants that replace the Taper / Second / Bottoming sequence for power tapping.
See our Cutting Compound range. Apply liberally before starting the tap and refresh every few turns. On aluminium, paraffin or kerosene works as a cutting lubricant. On plastic and timber, no lubricant is needed.
Broken taps are a workshop reality. Recovery: drill the broken portion out with a carbide drill, or use a tap extractor tool. Prevention: confirm the tap drill size, use cutting compound, clear chips every full turn by reversing the tap half a turn. HSSE V3 cobalt taps are more shock-tolerant for tough steels.
Material & Coating
HSS M2 high-speed steel (HSS). The everyday cutting-tool steel for drill bits. Hardness approximately 800 to 900 HV with an operating temperature range up to ~600 degrees C before the cutting edge anneals.
Important Use cutting fluid (light machine oil, kerosene or proper cutting compound) on steel and stainless to keep the cutting edge cool. Without fluid, temperature rises into the annealing range and the edge dulls quickly. Aluminium can be drilled dry; cast iron drills dry.
How to Measure
Length The size quoted is the overall length - measured end to end.
Sizing Taps (Straight Flute) are sized by the internal thread they cut (M1.6 through M24 metric coarse and fine; #4-40 through 1 inch UNC, UNF, BSW, BSF, BSP imperial). The tap drill hole size for each thread is published on the Taps technical chart. Use cutting compound on metal taps to extend tap life and produce a cleaner thread.
Still not sure? See our step-by-step identification guide for help measuring your fastener.
Resources
For full technical data including key product information, range and a CAD drawing, see our Technical PDFs library.
Convert between metric and imperial sizes, gauge to mm, decimal to fraction and TPI to pitch with our measurement conversion calculators.
About the Brand
Alpha · Sheffield Group · Australian
Alpha is the Sheffield Group's premium drilling, cutting and fastening brand. Australian-owned, Sheffield has supplied industrial and trade markets since 1957 and is one of the country's largest distributors of cutting tools and accessories.
Range: The Alpha range covers Gold Series HSS jobber drill bits, HSS Cobalt drill bits, Bi-Metal Cobalt holesaws, TurboBORE spade bits, heavy-duty timber augers, SDS Plus masonry bits, countersinks, ONSITE+ impact-rated step-tip drill bits, and the ThunderMax range of impact-driven accessories.
Positioning: Premium-quality, production-grade tools at trade pricing. Same-day dispatch from BNA Brisbane.
Pricing & Delivery
Includes GST, a Tax Invoice and Free Standard Delivery anywhere in Australia.
Buy with Confidence
15+ years selling online · 25,000+ stock lines · 200 million pieces ex-stock in Brisbane QLD.
Excellent on REVIEWS.ioTrusted by DIYers, tradespeople, builders, manufacturers, government, councils and engineers across Australia · Read reviewsDisclaimer
Technical data Researched and compiled from numerous industry sources for the sole purpose of providing basic information. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person, and Bolt and Nut Australia is not responsible for any loss, claim or damages arising therefrom. In developing this information, Bolt and Nut Australia has made a determined effort to present it accurately.
Measurements Sizes are taken from supplier catalogues or hand-measured and should be used as a guide. Minor variation between batches is normal. We only stock Alpha for this product; substituting another brand is rare and would always be confirmed with you first.
Product Photos & PDF Data Sheets Represent the product type, not exact size. PDFs are a reference guide only. Specifications may change without notice.
If you see any problems with any of our specifications or you require additional information please contact us.
Delivery
Weigh less than 500grams
Exceptions: Tools, Kits, Bulky items = Sent as a parcel with tracking
Small orders that fit into the slot of your Letterbox are sent:
FREE with Aust Post Letter delivery with NO TRACKING and delivery between 4-12 business days
Or
Select a Quicker delivery service
- $7.00 Parcel Delivery 2-7 business days
- From $12.00 Express Delivery 1-4 business days
- From $14.00 StarTrack PREMIUM Express Delivery 1-3 business days
Or
Click & Collect - Warehouse pickup
Unit 9, 93 Rivergate Place, Murarrie, QLDPlace your order online and we will have it ready within 2 hours. Call if required sooner
Pickup times between 8am - 4pm, Monday - Friday
Weigh more than 500grams
Included is orders under $30 but weigh more than 500grams or wont fit in the slot of your letterbox
Including Large and Bulky heavy orders are sent:
FREE as a Parcel Delivery WITH TRACKING and delivery between 2-7 business days
Or
Select an Express delivery service
- From $12.00 Express Delivery 1-4 business days
- From $14.00 StarTrack PREMIUM Express Delivery 1-3 business days
Or
Click & Collect - Warehouse pickup
Unit 9, 93 Rivergate Place, Murarrie, QLDPlace your order online and we will have it ready within 2 hours. Call if required sooner
Pickup times between 8am - 4pm, Monday - Friday
Further delivery information can be found on our Delivery page
Supplier Details
| MPN | 14C516TA |
| UPC | 9342386038606 |
