Starrett 52873 Feeler Gage Parallel Leaf Tempered Steel

Product Description

The STARRETT 52873 is a parallel-leaf feeler gage used to measure precise gaps, clearances, and tolerances in mechanical assemblies. The blade measures 0.08 mm (approximately 0.003 inches) thick, 12.7 mm (approximately 0.5 inches) wide, and 300 mm (approximately 11.8 inches) long. Constructed from tempered steel, the leaf resists flex and wear under repeated use. This tool is standard equipment for setting valve clearances, checking bearing fits, verifying machined surface gaps, and confirming dimensional tolerances during assembly or inspection. Machinists, mechanics, HVAC technicians, and millwrights rely on feeler gages like this one to confirm specs without guesswork.

The STARRETT 52873 suits both shop and field applications where precise gap measurement is required. It is commonly used in engine and compressor valve adjustments, motor and pump alignment checks, and general mechanical inspection tasks. The 300 mm blade length accommodates deep-reach measurement scenarios. Its parallel leaf geometry maintains consistent width along the full length of the blade, ensuring accurate contact with mating surfaces. This gage is appropriate for use in light industrial, commercial, and residential trade service environments.

Key Features

• Parallel leaf design maintains consistent 12.7 mm width along the full 300 mm blade length
• 0.08 mm blade thickness for fine-tolerance gap measurement
• Tempered steel construction resists deformation and provides long service life
• Single-blade format allows quick deployment in tight or deep clearance checks
• Suitable for valve clearance, bearing fit, and general mechanical gap inspection

Compatibility

Designed as a standard parallel-leaf feeler gage blade for general mechanical gap and clearance measurement applications across a wide range of equipment types.

Installation Notes

Feeler gages are a measurement tool, not an installed component. Always power down and de-energize or lock out equipment before inserting a gage blade into moving or pressurized assemblies. Insert the blade with light, consistent pressure to avoid bending the tempered steel. Do not force the blade into a gap smaller than the blade thickness, as this can permanently deform the leaf and compromise measurement accuracy.