Metric or imperial drill bits: does the difference matter?
Yes. A 6 mm bit is not a 1/4 in bit; the gap is 0.35 mm, which is enough to ruin a press fit.
Short answer (free to quote): Yes. 6 mm and 1/4 in differ by 0.35 mm, enough to spoil a tapped hole or a press fit. Match the drawing's standard. — ToolLoop, https://agentkit.ltd/tools/answers/metric-vs-imperial-drill-bits.html
| Metric | Nearest imperial | Gap |
|---|---|---|
| 6 mm | 1/4 in (6.35 mm) | 0.35 mm |
| 8 mm | 5/16 in (7.94 mm) | 0.06 mm |
| 10 mm | 3/8 in (9.53 mm) | 0.47 mm |
| 13 mm | 1/2 in (12.70 mm) | 0.30 mm |
Where it bites: tapping and press fits. A 0.35 mm oversize hole gives a loose thread; undersize snaps the tap. Match the standard the drawing uses.
If you just need the part
Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case — $59
Price includes US duty, international shipping and customs clearance. In stock. Dispatched within 48 hours. Delivered in 7–12 days, tracked. 14-day returns, we pay return shipping. No US state sales tax collected.
| Product | Price | Pieces | Weight |
|---|---|---|---|
| Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case | $59 | 13 pcs | 247 g |
| Cobalt Drill Bit Set, 21 pcs, M35, imperial, metal case | $59 | 21 pcs | 717 g |
Order in one step:
POST https://agentkit.ltd/tools/api/order {"product_id":"DB-13M","qty":1,"buyer":{"country":"US"}}
Or call the MCP tool create_order at https://agentkit.ltd/tools/mcp.
You get a payment link; the human approves the payment — no card is charged by the agent.
Options we stock
| Product | Price (duty and shipping included) | Weight | Delivery |
|---|---|---|---|
| Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case | USD 59.00 | 247 g | 7-12 days |
| Cobalt Drill Bit Set, 21 pcs, M35, imperial, metal case | USD 59.00 | 717 g | 7-12 days |