Spi 91-368-1 Feeler Gauge 0.015 in Parallel Leaf 12 in

Product Description

The SPI 91-368-1 is a single parallel-leaf feeler gauge used to measure gaps, clearances, and tolerances in mechanical assemblies. The leaf measures 0.015 inches thick, 0.5 inches wide, and 12 inches long, giving technicians a full-length blade for reaching into tight or recessed spaces. Constructed from high-carbon steel, the leaf holds its shape under repeated use and resists deformation at the measuring tip. HVAC technicians, machinists, and plumbers rely on feeler gauges like this one for setting burner gaps, checking valve clearances, and verifying contact spacing during equipment service and commissioning.

This gauge is suited for trade professionals who need a dedicated single-thickness blade rather than a folding set. The 12-inch length is practical for boiler flue baffle clearances, compressor valve inspections, and alignment checks on pumps or fan assemblies. The parallel-leaf design means the thickness is consistent from heel to tip, which matters when a measurement needs to be taken at a point several inches into an assembly rather than right at the edge.

Key Features

• Parallel leaf design — consistent 0.015-inch thickness from end to end
• High-carbon steel construction for durability and resistance to deformation
• 12-inch blade length for reaching deep into assemblies
• 0.5-inch blade width provides a stable, readable contact surface
• Single-leaf format suits applications requiring one dedicated thickness

Compatibility

Designed as a general-purpose parallel-leaf feeler gauge for use in HVAC, mechanical, plumbing, and electrical service applications where a 0.015-inch gap measurement is required.

Installation Notes

Feeler gauges are hand tools used by HVAC technicians, pipefitters, and mechanics during inspection and adjustment procedures. Power down or de-energize any equipment before inserting the gauge blade near electrical contacts or moving parts. Do not force the blade into a gap smaller than the rated thickness, as this can bend the leaf and introduce measurement error. Clean the blade after use to prevent corrosion and store it flat to maintain straightness.