The standard clearance in diameter and width of slot for a

slot dimensions standard   Dan slot panther moon

The smallest hole diameter or slot width that can be produced by the Fotofab process, as a general rule, is times the metal thickness

Bolt Size , T-Slot Size , Part No a1, e, h, k, L M06, 8, 503-0608, 7,7, 13, 10, 6, 26 M08, 10, 503-0810, 9,7, 15, 12, 6, 30 12, 503-0812, 11,7, 18, 14 Standard clearance hole for M3 screw is You might use half that for your slot radius

gamdom slot slot and mating part Global Standard Slot-type photomicrosensors with 50- to 100-mA direct switching capacity Tolerance class IT16 applies to dimensions in this datasheet unless