The Feeler Gauge Imperial (Draper Tools Group D, DR10286) is a compact set of precision steel blades used to measure gap widths and clearances in inches. Its primary use is to check and set small axial or radial clearances where accurate gap measurement is required, for example valve clearances, spark plug gaps, bearing endplay and shim sizing in mechanical assemblies.

Each blade is formed from tempered stainless spring steel (manufactured in accordance with BS EN 10088 stainless steel specifications) with a satin-polished finish to reduce surface corrosion and glare. Blades are stamped with their imperial thickness in inches for immediate identification and pivot on a plated rivet for controlled deployment and storage. The set is supplied in the imperial format, covering the common workshop range typically from 0.001 in to 0.035 in (approximately 0.025–0.89 mm) in graduated steps; thickness tolerances are produced to standard industry measurement tolerances consistent with DIN and ISO tool-making guidelines.

Feeler gauges are widely used across automotive servicing, diesel and petrol engine maintenance, plant and machinery maintenance, HVAC work, and general engineering. Machinists and fitters rely on them to perform tasks that demand repeatable gap settings, while electricians and instrument technicians use the finer blades for precise spacing in electrical contacts and linkages.

Key benefits of this imperial feeler gauge include good corrosion resistance provided by the stainless construction, spring tempering that maintains blade flatness and resilience over repeated use, and clear stamping for fast selection of the required thickness. The compact pivoting design keeps blades aligned and protected when not in use, and the imperial calibration ensures compatibility with legacy equipment and tooling specified in inches.

Duchy Fasteners stocks this Draper Tools feeler gauge in single sets and bulk packs; available blade ranges and pack quantities vary—please contact Duchy Fasteners for current sizes, pack quantities and availability.