Starrett 52877 Feeler Gage 0.25mm Parallel Leaf

Product Description

The STARRETT 52877 is a single-leaf feeler gage used to measure precise clearances and gaps in mechanical assemblies. The leaf measures 0.25 mm thick, 12.7 mm wide, and 300 mm long, providing a consistent, flat reference surface for gap checks on engine components, valve trains, bearing fits, and machined surfaces. Constructed from tempered steel, the leaf resists flex and wear under repeated use. This type of precision measurement tool is a standard item in the toolkit of machinists, millwrights, HVAC technicians, and maintenance mechanics working to spec tolerances.

The STARRETT 52877 suits applications where a specific feeler gage thickness is needed as a standalone replacement leaf or as a supplemental blade. The parallel leaf style delivers a uniform cross-section from end to end, making it reliable for go/no-go gap checks, setting ignition points, adjusting valve clearances, and verifying dimensional tolerances during equipment assembly or preventive maintenance. Its 300 mm length allows reach into tight or recessed clearance areas without bending the blade.

Key Features

• 0.25 mm nominal thickness for precise gap measurement
• Parallel leaf style provides uniform cross-section along the full 300 mm length
• Tempered steel construction resists deformation and wear
• 12.7 mm blade width offers a stable contact surface for accurate seating
• Suitable for standalone use or as a replacement leaf in a feeler gage set

Compatibility

Designed as a standard parallel-leaf feeler gage blade for use in general mechanical, HVAC, and industrial maintenance applications where 0.25 mm clearance measurement is required.

Installation Notes

Insert the feeler gage leaf into the gap with light, even hand pressure — the blade should slide with slight drag, not bind or move freely without resistance. De-energize, lock out, and cool down any equipment before measuring internal clearances on operating machinery. Do not force or bend the leaf; tempered steel can fracture if flexed beyond its yield point. Clean the blade and mating surfaces before use to avoid false readings caused by debris buildup.