How do I check that a drilled hole is actually the right size?
| Nominal bit | Typical drilled size in steel | In wood |
|---|---|---|
| 6 mm | 6.05-6.15 mm | 6.0-6.3 mm |
| 10 mm | 10.05-10.15 mm | 10.1-10.4 mm |
| 13 mm | 13.05-13.2 mm | 13.1-13.5 mm |
| Any, after regrinding | 0.2-0.5 mm oversize | Can be undersize if the point is off-centre |
Why oversize: no drill cuts perfectly on size. The point wobbles, the two flutes are not identical, and in wood the grain pulls the bit. If a fit needs to be exact, drill undersize and ream or bore to final size.
Reading a caliper correctly: square the jaws to the hole axis, not tilted. A caliper held at 5 degrees off reads about 0.4 percent small on a 10 mm hole, which is enough to fail a press fit.
Cobalt Drill Bit Set, 21 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, 21 pcs, M35, imperial, metal case | $59 | 21 pcs | 717 g |
| Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case | $59 | 13 pcs | 247 g |
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POST https://agentkit.ltd/tools/api/order {"product_id":"DB-21M","qty":1,"buyer":{"country":"US"}}
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Options we stock
| Product | Price (duty and shipping included) | Weight | Delivery |
|---|---|---|---|
| Cobalt Drill Bit Set, 21 pcs, M35, imperial, metal case | USD 59.00 | 717 g | 7-12 days |
| Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case | USD 59.00 | 247 g | 7-12 days |