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Spend DISCOUNTS
8mm x 117mm Cobalt HSS Jobber Drill Bit Alpha 9LM080CO
| BUY MORE. SAVE MORE. | ||||
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| Price for each item | Subtotal | % savings | ||
| Buy 1 | Buy 1 | $24.00 each | $24.00 | - |
| Buy 2 + | Buy 2 - 4 | $22.00 each | $44.00 | 8.33% |
| Buy 5 + | Buy 5 - 9 | $21.00 each | $105.00 | 4.55% |
| Buy 10 + | Buy 10 + | $19.00 each | $190.00 | 9.52% |
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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 | Metric |
|---|---|
| Product | Cobalt Drill Bit |
| Size | M8 (8mm) |
| Material | Cobalt High Speed Steel |
| Length (l) | 117mm |
| Flute Length (fl) | 75mm |
| Drill Chuck Size | 3/8" |
| Suitable For | Stainless, High Tensile Steel and Cast Iron |
| Point | 135 deg. Split Point |
| Closest size in fraction | 5/16" |
| Packaging | Carded |
| Brand | Alpha |
Dimensional data is a guide only. Tolerance differences exist between brands and batches
About Jobber Drill Bits
Jobber drill bits are the everyday workhorse of the metal-drilling world. HSS for general steel, alloy and timber; HSS Cobalt for stainless and hardened workpieces; both ranges run from 1mm through 25mm in metric, imperial and number/letter sizes. 135-degree split point self-centres without a punch-mark, jobber-length flute clears chips through standard panel thickness.
Frequently Asked Questions
The 135-degree split point self-centres on a flat surface without a punch-mark. The helical flute clears chips through standard panel thickness. Cobalt grades cost more than standard HSS but last many times longer on stainless and hardened workpieces.
Quick pick for Jobber Drill Bits (what BNA stocks):
| If you are drilling | Pick | Why |
|---|---|---|
| Steel, wood, plastic, light stainless - everyday drilling | Alpha Gold | BNA's everyday production-grade Alpha Gold range. TiN coating lifts edge life roughly 30 percent over plain HSS. Best for steel, wood, plastic and light stainless work. |
| Hardened steel, cast iron, stainless steel, high-tensile work | Alpha Cobalt | Cobalt content lets the cutting edge run hotter without dulling. Where plain HSS anneals within a few holes in stainless, Alpha Cobalt cuts cleanly through hundreds. The standard upgrade for hardened steel, cast iron, stainless and high-tensile work. |
| Stainless steel drilling | Sutton Inox or Stainless Plus | Two specialised picks for stainless steel drilling. Sutton Inox is Sutton's premium stainless bit; Stainless Plus is BNA's equivalent - both run cooler and resist annealing in stainless. Pick either based on availability; both are engineered for the same use case. |
| Value-grade general drilling | Bristol or black oxide drill bits | Value-grade production twist drills covering Bristol (uncoated / bright finish) and black oxide finishes. Reliable everyday choice when the production-grade premium isn't required. |
Tighten the chuck on the shank, not on the flute. If the chuck slips under load, the shank is sliding. Re-tighten harder or wipe oil off the shank. Bench drills, cordless drivers and impact drivers all accept standard twist drills.
Rule of thumb: 1mm-3mm bits at 2000-3000 RPM; 4mm-8mm at 1000-2000 RPM; 10mm-13mm at 500-1000 RPM; over 13mm under 500 RPM. Use a light machine oil, kerosene or proper cutting fluid on steel. Aluminium can be drilled dry but a few drops of WD-40 cuts cleaner. Cast iron drills dry. Stainless absolutely needs fluid.
Drill a pilot 25-50% of the final diameter first. For example, drilling a 13mm hole, start with a 6mm pilot. Without one, the chisel edge of the drill grinds rather than cuts, the bit walks, and the tip can burn. The pilot also lets the final bit centre on the existing hole without skating.
Most users have moved to disposable bits because sharpening by hand needs practice. A sharpener jig (Drill Doctor or similar) holds the geometry consistently. If you sharpen by hand, keep the original lip angle and equalise the two cutting edges. An uneven sharpen drills an oversize hole.
On site, a Step Tip Drill Bit eliminates the walk by self-centring on the work without a punch-mark. On the bench, a centre punch dot gives the drill chisel-edge something to bite into.
Material & Coating
HSS Cobalt M35 M35 high-speed steel with 5 percent cobalt addition. The cobalt content lifts the operating temperature range to approximately 700 degrees C, so the cutting edge survives stainless and hardened workpieces where standard HSS would anneal within a few holes.
Grade selection Stainless steel (304, 316, duplex), hardened plate, alloy steels and exotic metals like Inconel. The right choice when standard HSS is failing within a hole or two. Pays for itself in stainless work by lasting many times longer.
Important Cutting fluid is non-negotiable in stainless. Run 30 to 40 percent slower than mild steel. Keep the bit moving forward; stainless work-hardens if the cutting edge dwells in one spot.
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.
Not sure what 1/4" is in mm (or vice versa)? See our metric to imperial chart for the conversion every drill-bit size customers ask about.
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.
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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 | 9LM080CO |
| UPC | 9342386011692 |
