Starrett 52842 Feeler Gage 0.004 in Parallel Leaf Steel

Product Description

The STARRETT 52842 is a single parallel-leaf feeler gage used to measure precise gaps, clearances, and tolerances in mechanical assemblies. The leaf measures 0.004 inches thick, 0.5 inches wide, and 12 inches long, providing consistent parallel geometry across the full length of the blade. Constructed from tempered steel, the leaf resists flex and wear under repeated use. This style of feeler gage is a standard precision-measurement tool used by HVAC technicians, machinists, plumbers, and equipment service professionals who need reliable gap verification during equipment setup, alignment, or maintenance procedures.

Parallel-leaf feeler gages in this thickness range are commonly used to check valve clearances, burner orifice alignment, compressor blade clearances, flange gaps, and bearing tolerances. The 12-inch blade length accommodates applications where reach into a assembly is required. The 0.004-inch thickness is a commonly specified clearance value in residential and light commercial HVAC equipment, refrigeration compressors, and general mechanical service work. This gage is sold as a single leaf and is suitable for standalone use or as a replacement within a gage set.

Key Features

• Parallel leaf geometry maintains consistent thickness across the full 12-inch blade length
• Tempered steel construction for durability and resistance to deformation under repeated use
• 0.004-inch thickness suits commonly specified clearance tolerances in HVAC and mechanical service
• 0.5-inch blade width provides a stable measuring surface in accessible gaps
• Single-leaf format allows targeted replacement or standalone use without an entire set

Compatibility

Designed as a standard parallel-leaf feeler gage suitable for general mechanical, HVAC, refrigeration, and equipment service applications requiring a 0.004-inch gap measurement leaf.

Installation Notes

Feeler gages are used by licensed HVAC technicians, machinists, and equipment service professionals. Always de-energize and lock out equipment before inserting a feeler gage into any moving assembly or live electrical compartment. Insert the leaf smoothly without forcing it; bending or kinking the blade will compromise measurement accuracy. Keep the blade clean and lightly oiled when stored to prevent corrosion of the tempered steel surface.