Starrett 52866 Feeler Gage 0.028 in Parallel Leaf Steel

Product Description

The STARRETT 52866 is a single-leaf feeler gage designed for precise gap and clearance measurement in mechanical and HVAC service applications. The leaf measures 0.028 inches thick, 0.5 inches wide, and 12 inches long, machined to a parallel profile from tempered steel. Tempered steel construction maintains dimensional accuracy under repeated use and resists deformation from contact with tight tolerances. This type of feeler gage is a standard tool on the bench and in the field for technicians setting valve clearances, checking bearing fits, verifying burner orifice gaps, and confirming component spacing during assembly or inspection work.

Feeler gages of this profile are used across residential and light commercial service work, including HVAC equipment assembly, gas appliance burner alignment, and mechanical component fitting. The 12-inch leaf length provides reach into confined equipment bays common in furnace, air handler, and rooftop unit service. The 0.028-inch thickness fills a commonly referenced gap tolerance found in combustion and mechanical clearance specifications. Licensed HVAC technicians, millwrights, and service mechanics are the primary users of this gage in trade settings.

Key Features

• Parallel leaf profile ensures consistent thickness along the full 12-inch length
• Tempered steel construction resists bending and maintains calibrated thickness under repeated use
• 0.028-inch thickness addresses a common gap tolerance in mechanical and combustion equipment service
• 0.5-inch leaf width provides enough contact surface for stable gap readings
• Single-leaf format simplifies use in applications requiring one specific clearance measurement

Compatibility

Designed as a general-purpose feeler gage leaf suitable for mechanical clearance and gap measurement tasks in HVAC, plumbing, and general trade service work where a 0.028-inch parallel leaf is specified.

Installation Notes

Feeler gages are hand tools requiring no installation, but proper use is critical for accurate readings. Insert the leaf without forcing it into the gap — correct fit is achieved when the leaf slides with light drag and no binding. Keep the leaf clean and free of oil or debris that could affect the measured gap. Store the leaf flat or in a protected sleeve to prevent bending, which would invalidate its calibrated thickness.