feeler gage

feeler gage

[′fēl·ər ‚gāj]
(mechanical engineering)
A tool with many blades of different thickness used to establish clearance between parts or for gapping spark plugs.
References in periodicals archive ?
Step 3 of WP 0700 00 (UH-60A/L) and WP 0656 00 (UH-60M) tells you what to do to get the right reading when using a feeler gage, NSN 5120-01-335-1666, and a straight edge.
Some mechanics place the straight edge along the flange surface and the flexible couping while holding the straight edge by either end, then try to measure the deflection gap with the feeler gage. The problem is that placing too much pressure with your finger at either end of the straight edge creates a gap and gives an erroneous reading with the feeler gage.