Starrett 52878 Feeler Gage Parallel Leaf Tempered Steel

Product Description

The STARRETT 52878 is a parallel-leaf feeler gage used to measure precise clearances and gaps in mechanical assemblies. The leaf measures 0.3 mm thick, 12.7 mm wide, and 300 mm long, providing a consistent, uniform cross-section across the full length. Constructed from tempered steel, the leaf resists deformation and maintains accurate thickness under repeated use. This type of feeler gage is a standard instrument in HVAC, automotive, engine, and general mechanical service work wherever tight gap tolerances must be verified or set.

Parallel feeler gage leaves are used in applications that require a consistent thickness reading along the full length of the blade. Common uses include setting valve clearances, checking bearing clearances, verifying spark plug gaps, measuring brake shoe-to-drum clearance, and checking alignment tolerances in equipment assembly. This gage is suited for both shop and field use by machinists, millwrights, HVAC technicians, and general mechanical service professionals.

Key Features

• Parallel leaf style provides uniform thickness from tip to base for consistent readings
• Tempered steel construction resists wear and maintains dimensional accuracy
• 0.3 mm thickness for measuring fine clearances in mechanical and HVAC equipment
• 300 mm length allows reach into deep or recessed assemblies
• 12.7 mm blade width provides stable contact surface during measurement

Compatibility

Designed as a standard parallel-leaf feeler gage blade suitable for general mechanical gap measurement applications across trade and industrial service environments.

Installation Notes

Feeler gages are precision measurement instruments installed and used by machinists, millwrights, and service technicians. Power down and de-energize any equipment before inserting a feeler gage into a clearance or gap. Insert the blade with light, steady pressure — forcing the blade can cause deformation and affect accuracy. Clean and dry the blade before and after use to prevent corrosion and maintain measurement integrity.