Starrett 52856 Feeler Gage 0.018 in Parallel Leaf Steel

Product Description

The STARRETT 52856 is a single-leaf feeler gage used to measure and set precise clearances during mechanical assembly, engine service, and equipment maintenance. The leaf measures 0.018 inches thick, 0.5 inches wide, and 12 inches long, with a parallel profile that keeps thickness consistent across the full length of the blade. Constructed from tempered steel, the blade resists wear and flex under repeated use. HVAC technicians, plumbers, machinists, and engine mechanics reach for this tool when verifying valve clearances, bearing fits, spark plug gaps, or any gap that demands a known, repeatable measurement. At 0.04 pounds, it is light and easy to handle in tight spaces.

This feeler gage is suited for residential and light commercial maintenance environments where accurate gap checking is part of routine service. Common applications include checking flue damper clearances on gas appliances, verifying actuator and linkage tolerances in HVAC equipment, setting valve lash on small engines and combustion systems, and confirming pump and compressor bearing clearances during overhaul. The 12-inch blade length provides reach into recessed assemblies without requiring the technician to disassemble surrounding components.

Key Features

• Parallel leaf profile maintains consistent 0.018-inch thickness across the full 12-inch blade length
• Tempered steel construction resists deformation and provides long service life under repeated use
• 0.5-inch blade width offers a stable contact surface for accurate gap measurement
• Lightweight at 0.04 pounds for easy single-hand use in confined spaces
• Single-leaf format allows direct selection of the required thickness without fanning through a set

Compatibility

Designed as a standard parallel-leaf feeler gage for use across general mechanical, HVAC, plumbing, and engine service applications where a 0.018-inch gap measurement is required.

Installation Notes

Feeler gages require no installation, but proper use demands that mating surfaces be clean and free of debris before inserting the blade into a gap. Apply light, consistent drag pressure when sliding the leaf through a clearance — the leaf should move with slight resistance for an accurate fit check. Do not force or bend the blade, as permanent deformation will affect measurement accuracy. Store the leaf flat or in a protective case to prevent warping between uses.