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Feeler Gauges: Frequently Asked Questions

Feeler gauge FAQ

Shop for Feeler Gauges

Should I worry about the clearance gap being affected by changes in temperature?

Hot car engine The part clearances detailed in the part specification or manual should be suitable for all operating conditions.

The clearance, if set correctly, will be suitable even as parts expand when the temperature is raised.

What is BS957?

Guidelines BS957 is a specification for feeler gauges published by the British Standards Institution (available online).

This specification refers to how the tool should be constructed and how it should function. It includes descriptions of blade thickness, dimensions of blades and limits of accuracy.

You may wish to consult this specification for more in depth information about feeler gauge construction.

What can I expect from a high end feeler gauge?

£80 Feeler Gauge A high end feeler gauge is typically made from tempered steel with a locking device which permits the leaves to be removed for individual use.

The measurement range of the pictured feeler gauge is 0.0015 – 0.200 inches across 13 leaves.

What can I expect from a cheaper plastic gauge?

£5 Feeler Gauge Plastic cased gauges may be more susceptible to damage. They perform the same job but often have a smaller range of measurements.

The feeler gauge pictured has an impact resistant polypropylene case and measures 0.04mm – 0.63mm.

Do feeler gauges wear out easily?

Feeler gauges are susceptible to gouging Only after regular use or after many high friction applications (when applied with too much force) will a leaf begin to gouge.

“Gouging” is a term used to describe when the surface becomes so scratched or worn that grooves start to appear.

If gouging occurs, the gauge may no longer provide accurate measurements, and should be replaced.

Wonkee Donkee Tools