Starrett 52857 Feeler Gage 0.019 in Parallel Leaf Steel

Product Description

The STARRETT 52857 is a single-leaf feeler gage used to measure and verify tight clearances in mechanical assemblies. The parallel leaf is ground to a precise thickness of 0.019 inches, with a width of 0.5 inches and a length of 12 inches. Constructed from tempered steel, the blade resists flex and wear under repeated use. This gage is a standard hand tool for HVAC technicians, machinists, plumbers, and equipment service pros who need reliable gap measurement during maintenance, alignment, or installation work. The 12-inch length provides reach into confined spaces without sacrificing rigidity.

This feeler gage leaf is suited for checking valve clearances, burner orifice gaps, flue collar fitment, heat exchanger component spacing, and general mechanical clearance verification. It is equally at home in residential and light commercial service work. Technicians use individual leaves like this one as replacements for worn blades in a set, or as dedicated go or no-go gap tools kept in a service kit for a specific clearance spec.

Key Features

• Precision-ground parallel leaf at exactly 0.019 inches thick for repeatable gap measurement
• Tempered steel construction resists deformation and corrosion during service use
• 0.5-inch blade width provides stable contact surface on flat mating faces
• 12-inch length allows reach into deep or restricted assemblies
• Single-leaf format works as a standalone tool or as a replacement in a multi-leaf set

Compatibility

Designed as a standard parallel-leaf feeler gage blade for general mechanical clearance measurement across HVAC, plumbing, and equipment service applications.

Installation Notes

Feeler gages are hand tools and require no power source or special tooling for use. Power down or de-energize any equipment before inserting the blade into gaps near moving parts or energized components. Keep blades clean and lightly oiled when stored to prevent surface oxidation that could affect measured thickness. Do not bend or force the leaf into a gap smaller than its rated thickness, as this will permanently deform the blade.