Spi 91-397-0 Feeler Gage 0.09mm Parallel Leaf High Carbon Steel

Product Description

The SPI 91-397-0 is a single-leaf feeler gage used to measure precise gaps and clearances in mechanical assemblies. The leaf measures 0.09 mm in thickness, 0.5 inches wide, and 12 inches long with a parallel profile that maintains consistent thickness from end to end. Manufactured from high carbon steel, the blade resists wear and holds dimensional accuracy through repeated use. This type of gage is standard tooling for HVAC technicians, machinists, engine mechanics, and industrial maintenance professionals who need reliable gap measurement in tight tolerances.

Feeler gages like the 91-397-0 are used across a broad range of service and assembly applications, including setting valve clearances, checking spark plug gaps, verifying bearing clearances, and confirming component alignment. The 12-inch parallel leaf is well suited for reaching into confined spaces or spanning longer measurement zones where a shorter blade would not make full contact. It is commonly used in both field service and shop environments by technicians who require a durable, single-blade gage for repetitive measurement tasks.

Key Features

• 0.09 mm blade thickness for precise clearance measurement
• Parallel leaf style maintains uniform thickness along the full 12-inch length
• High carbon steel construction for durability and dimensional stability
• 0.5 inch blade width provides a stable contact surface during measurement
• 12-inch length allows access in extended or hard-to-reach measurement areas

Compatibility

Designed as a standard single-leaf feeler gage suitable for general mechanical, HVAC, and industrial maintenance applications requiring 0.09 mm gap measurement.

Installation Notes

Feeler gages are hand tools that require no installation. Always clean the blade and the mating surfaces before taking a measurement to ensure accurate results. Do not force the blade into a gap; the correct thickness should slide with light drag. Store the blade flat or in a protective sleeve to prevent bending or surface corrosion.