Spi 91-401-0 Feeler Gage 0.25mm Parallel Leaf

Product Description

The SPI 91-401-0 is a single-leaf feeler gage used to measure small gaps and clearances with repeatable precision. The leaf is 12 inches long and 0.5 inches wide with a uniform parallel profile, providing consistent thickness along the full length. Manufactured from high carbon steel, the leaf resists wear and holds its calibration under regular shop use. This tool is commonly used by HVAC technicians, machinists, and engine mechanics to check valve clearances, burner gaps, spark plug gaps, and similar close-tolerance measurements where a specific gap dimension must be confirmed.

This feeler gage is suited for light industrial, HVAC service, and mechanical maintenance applications. The 0.25 mm (approximately 0.0098 inch) thickness makes it appropriate for fine-gap checks on gas valve components, igniter electrode spacing, and precision machinery clearances. The 12-inch parallel leaf is long enough to reach into recessed assemblies without requiring additional tooling. Technicians working on residential and light commercial equipment will find the full-length parallel leaf practical for consistent contact across the measurement point.

Key Features

• 0.25 mm leaf thickness for fine-tolerance gap measurement
• Parallel leaf style provides uniform thickness from tip to base
• 12-inch leaf length allows reach into recessed or deep assemblies
• 0.5-inch leaf width gives stable surface contact during measurement
• High carbon steel construction resists deformation and wear

Compatibility

Designed as a general-purpose feeler gage suitable for use in HVAC service, mechanical maintenance, and light industrial applications requiring 0.25 mm gap measurement.

Installation Notes

No power source or shutoff is required for feeler gage use. Insert the leaf into the gap with light, consistent hand pressure — forcing the leaf can bend the tip or alter the reading. Keep leaves clean and free of debris before use. Store flat to prevent warping that would compromise measurement accuracy.