Cobalt Drill Bits in Bulk for Shops and Plants: Sizes and Prices
In short
Supply Tie stocks cobalt drill bits from IRWIN, Milwaukee, DeWalt and Diablo as single jobber bits from 1/16 in. to 1/2 in. and as 14–15 piece sets. Common small sizes list from about $1.05 a bit, so maintenance cribs can restock the sizes that actually break. Restocking several stations? Send your list for a free bulk price check.
In stock now
| Size / type | Brand & part | Pack | Price | Link |
|---|---|---|---|---|
| 1/16 in. jobber | IRWIN 3016004 | 1 pc | $1.05 | View |
| 3/32 in. jobber | IRWIN 3016006 | 1 pc | $1.07 | View |
| 7/64 in. jobber | IRWIN 3016007 | 1 pc | $1.11 | View |
| 1/8 in. split point | DeWalt ELITE SERIES | 1 pc | $3.77 | View |
| 5/32 in. jobber | IRWIN 3016010 | 1 pc | $1.63 | View |
| 13/64 in. jobber | IRWIN 3016013 | 1 pc | $2.35 | View |
| 7/32 in. jobber | IRWIN 3016014 | 1 pc | $2.43 | View |
| 17/64 in. jobber | IRWIN 3016017 | 1 pc | $4.71 | View |
| 3/8 in. jobber | IRWIN 3016024 | 1 pc | $6.47 | View |
| 1/2 in. jobber | IRWIN 3016132 | 1 pc | $9.63 | View |
| 14-pc set | DeWalt ELITE SERIES DWAMDCE14SET | Set | $30.65 | View |
| 15-pc set | IRWIN 316015 | Set | $47.83 | View |
Prices as listed on supplytie.com on Oct 30, 2026; they can change. Case, pallet and repeat-order pricing is quoted on request.
How to choose
- Cobalt vs. black oxide: cobalt (M35/M42) bits keep their edge in stainless, hardened and cast steel; black oxide HSS is cheaper for mild steel, wood and plastic
- Point: 135° split points start without walking and need no center punch on most work
- Shank: straight shanks for drill presses and chucks; 3-flat or hex shanks resist spinning in cordless drills
- Speed and coolant: run slower with steady pressure and cutting fluid in stainless; heat kills edges faster than wear
- Buy the sizes that break: pilot sizes (1/8, 9/64, 5/32, 13/64 in.) wear first; stock singles in those sizes rather than buying full sets
More reading: Power tools & accessories buying guide · Fasteners buying guide · Cut-off wheels in bulk
About Supply Tie
Supply Tie carries 150,000+ products for warehouses, plants and manufacturers and ships to the lower 48 states and DC. Poly bags, boxes and MRO supplies ship in 1–2 business days. Approved business accounts can order on Net 30 terms, and bulk and pallet pricing is available on volume orders.
Or email your list to support@supplytie.com. Mon–Fri 8–4 ET.
FAQ
Where can a shop buy cobalt drill bits in bulk?
Supply Tie stocks cobalt drill bits from IRWIN, Milwaukee, DeWalt and Diablo as single bits and sets and ships to the lower 48 states and DC. For box quantities by size, send your list through supplytie.com/pages/price-check for a free bulk price check.
How much do cobalt drill bits cost?
On supplytie.com, IRWIN cobalt jobber bits start around $1.05 for 1/16 in. and run about $9.63 for 1/2 in.; 14–15 piece cobalt sets list from about $30.65. Prices can change.
When should I use cobalt drill bits?
Use cobalt bits for stainless steel, hardened steel, cast iron and other tough metals. For wood, plastic and mild steel, standard HSS or black oxide bits usually cost less per hole.
What speed should I drill stainless steel with cobalt bits?
Run a lower RPM with firm, steady feed and cutting fluid. Stopping and rubbing work-hardens stainless and dulls the bit quickly.
Should I buy sets or single bits?
Buy one set per station, then restock with single bits in the sizes that wear or break most, often the small pilot sizes.