A thread too close to an edge can break out or bulge the wall. Call size, depth, hand, and whether the face is cosmetic. Aluminum and stainless 304 / 316 behave differently — part-by-part, not “tap will always work” in the AI price.
Quantity 1 can ask. Prefer STEP. Target 12h UTC+8. Aluminum walls commonly ≥1.0 mm.
Tick inspection if you need it. Lead time splits. No implants.
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