Starrett 667S-20 Feeler Gage 0.02 in Parallel Leaf 12 in

Product Description

The STARRETT 667S-20 is a single parallel-leaf feeler gage designed for precise gap measurement in mechanical and HVAC service applications. The leaf measures 0.02 inches thick, 0.5 inches wide, and 12 inches long, providing consistent clearance readings across the full working length. Constructed from stainless steel, the leaf resists corrosion and holds dimensional stability under repeated use. This type of feeler gage is a standard hand tool for technicians who need to verify burner orifice clearances, blower wheel tolerances, valve seat gaps, and similar close-tolerance measurements during installation or service.

Single replacement leaves like the 667S-20 are used across residential and light commercial service work wherever a specific thickness leaf has been lost, worn, or damaged from an existing set. The parallel leaf style maintains uniform width along the full 12-inch length, making it suitable for checking gaps in confined or elongated spaces. HVAC technicians, plumbers, and equipment mechanics commonly keep individual replacement leaves on hand to restore a feeler gage set to full working specification without replacing the entire set.

Key Features

• Parallel leaf style — uniform 0.5-inch width along the full 12-inch length for consistent contact
• 0.02-inch nominal thickness for repeatable, direct-read gap measurement
• Stainless steel construction resists corrosion and maintains dimensional accuracy over time
• 12-inch working length reaches into deeper cavities than standard short-leaf gages
• Individual replacement leaf — restores an existing set without full replacement

Compatibility

Designed as a standard replacement parallel leaf for feeler gage sets accepting 0.5-inch-wide, 12-inch-long leaves at 0.02-inch thickness. Verify set compatibility with the manufacturer before ordering.

Installation Notes

Feeler gage leaves require no power-down procedure but should only be used on de-energized or mechanically stopped equipment when measuring internal clearances. Clean the leaf with a lint-free cloth before use to prevent debris from skewing readings. Do not bend or flex the leaf beyond its working range, as permanent deformation will compromise accuracy. This tool is typically used by HVAC technicians, plumbers, and general equipment mechanics as part of routine inspection and adjustment tasks.