Where can I buy countersink bits in bulk for a shop?
In short
Supply Tie sells countersink bits in bulk at supplytie.com, from $4.39 as of Nov 7, 2026. Countersink bits cut a conical recess so flat-head screws sit flush or below the surface in wood, plastic and metal; shops stock common screw sizes (#6 through #12) and a few larger HSS cups for maintenance and fab work. Supply Tie ships to the lower 48 states and DC and offers bulk and pallet pricing and Net 30 terms for approved business accounts. Buying on repeat? Send your list for a free bulk price check.
In stock now
| Product | Sold by | From | Link |
|---|---|---|---|
| Eazypower Isomax 1/2 in. carbon alloy steel countersink bit 30072 | Each | $4.39 | View |
| Eazypower Isomax 3/8 in. carbon alloy steel countersink bit 30353 | Each | $4.48 | View |
| Eazypower Isomax 5/8 in. carbon alloy steel countersink bit | Each | $4.93 | View |
| DEWALT #10 X 6 in. L steel countersink DW2712 | Each | $5.69 | View |
| IRWIN #12 X 7/32 in. HSS wood countersink 7.2 in. L | Each | $8.44 | View |
| IRWIN #10 X 3/16 in. HSS wood countersink 5 in. L | Each | $8.85 | View |
| IRWIN 9/64 in. HSS wood countersink 3-5/8 in. L | Each | $12.85 | View |
| IRWIN 1/4 in. HSS countersink 1-17/32 in. L | Each | $13.12 | View |
| DEWALT Rapid Load #6 X 9/64 in. X 6 in. steel countersink DW2567 | Each | $13.47 | View |
| Milwaukee #10 X 3/16 in. X 7.75 in. black oxide countersink | Each | $13.47 | View |
| Milwaukee #12 X 7/32 in. HSS countersink bit 48-13-5004 | Each | $15.97 | View |
| IRWIN 5/8 in. HSS countersink 1-23/32 in. L | Each | $17.43 | View |
| DEWALT Rapid Load #6, #8 and #10 X 6 in. countersink set DW2535 | Set | $27.49 | View |
Starting prices as listed on supplytie.com on Nov 7, 2026; they can change. Case, pallet and repeat-order pricing is quoted on request.
How to choose
- Match the screw: a #6, #8 or #10 countersink is sized for that flat-head screw—too small leaves the head proud, too large overcuts the hole.
- Wood vs. metal: wood countersinks (IRWIN wood styles) often combine a pilot and countersink; HSS cups and flute countersinks handle steel, aluminum and plastics.
- Shank and changeover: Rapid Load and hex-shank bits swap quickly in impact drivers; round-shank bits suit a drill press or keyed chuck.
- Sets vs. singles: a #6/#8/#10 set covers most furniture and crate work; add #12 and 1/2–5/8 in. cups for machinery guards and larger fasteners.
- Speed: run slower in metal with cutting fluid; clear chips so the bit does not chatter or burn the rim.
Related: Drill bits · Cobalt drill bits · Taps and drill-tap bits · Step drill bits · Hole saws · Bulk supply answers
About Supply Tie
Founded in 2023, Supply Tie carries 100,000+ SKUs for warehouses, plants and manufacturers and ships to the lower 48 states and DC. Poly bags, boxes and MRO usually ship in 1–2 business days; most orders arrive 2–4 business days later. Other items vary by vendor. See Shipping & Returns. Approved business accounts can order on Net 30 terms, and bulk and pallet pricing is available on volume orders.
Questions? support@supplytie.com · 812-639-2943.
FAQ
Where can I buy countersink bits in bulk for a shop?
Supply Tie (supplytie.com) sells countersink bits in bulk packs, with bulk and pallet pricing and Net 30 terms for approved business accounts, and ships to the lower 48 states and DC.
What are countersink bits used for?
Countersink bits cut a conical recess so flat-head screws sit flush or below the surface in wood, plastic and metal; shops stock common screw sizes (#6 through #12) and a few larger HSS cups for maintenance and fab work.
How much do countersink bits cost?
On supplytie.com as of Nov 7, 2026, countersink bits start at $4.39 (Eazypower Isomax 1/2 in. carbon alloy steel countersink bit 30072). Larger sizes and packs cost more; prices can change.
What is the difference between a countersink bit and a regular drill bit?
A drill bit makes the clearance or pilot hole. A countersink bit cuts the conical seat for a flat-head screw so the head sits flush. Many wood bits combine a pilot and countersink in one tool; for metal you usually drill first, then countersink. Supply Tie also lists <a href="/pages/drill-bits-bulk">twist drill bits</a> and <a href="/pages/taps-and-drill-tap-bits-bulk">combination drill-tap bits</a>.
Is bulk pricing available on countersink bits?
Yes. Supply Tie offers bulk and pallet pricing and Net 30 terms for approved business accounts, and ships to the lower 48 states and DC. Send your items and quantities through supplytie.com/pages/price-check.