Starrett 52871 Feeler Gage 0.05mm Parallel Leaf

Product Description

The STARRETT 52871 is a single-leaf feeler gage designed for precise gap measurement in mechanical assembly, engine work, and machine maintenance. The parallel leaf measures 0.05 mm thick, 12.7 mm wide, and 300 mm long, providing consistent cross-section geometry from end to end. Constructed from tempered steel, the blade resists flex and holds its calibrated thickness under repeated use. Machinists, engine technicians, and maintenance professionals use this gage to verify clearances on valve trains, bearing fits, mating flanges, and similar close-tolerance applications where accurate gap measurement is critical.

This feeler gage is suited for both shop and field use wherever a single precision leaf is needed rather than a folding set. The 300 mm length provides reach into deep assemblies, and the 12.7 mm width offers a stable contact surface. Typical applications include checking spark plug gaps, piston ring side clearance, brake rotor runout tolerance verification, and general-purpose precision gaging in industrial maintenance environments. The parallel leaf profile ensures the measurement is uniform along the full length of insertion.

Key Features

• Parallel leaf profile delivers consistent 0.05 mm thickness end to end
• Tempered steel construction provides durability and dimensional stability
• 300 mm length allows reach into deep or confined assemblies
• 12.7 mm blade width offers stable, full-contact gap measurement
• Single-leaf format for use as a standalone gage or as a replacement in a set

Compatibility

Designed as a standard parallel-leaf feeler gage blade suitable for general mechanical and industrial gaging applications where a 0.05 mm thickness specification is required.

Installation Notes

Feeler gages should be inserted into gaps with light, consistent hand pressure — forcing the blade can produce inaccurate readings or damage the leaf. Always clean contact surfaces before measuring to prevent debris from affecting gap readings. Store the blade flat or protected to prevent bending, which would compromise calibration. No special tools are required for use, but proper personal protective equipment should be worn when working near rotating or pressurized machinery.