Spi 91-402-8 Feeler Gauge Parallel Leaf 0.30 Mm

Product Description

The SPI 91-402-8 is a single-leaf feeler gauge used to measure precise gaps and clearances in mechanical assemblies. The parallel leaf design delivers consistent thickness across the full length of the blade, giving technicians a reliable reference when setting valve clearances, spark plug gaps, bearing tolerances, and similar close-tolerance fits. The leaf is manufactured from high carbon steel for durability and resistance to flex deformation. At 0.30 mm nominal thickness, it targets a commonly required measurement range across HVAC, refrigeration, and general mechanical service work. Licensed trades and industrial maintenance technicians are the typical end users.

This gauge is suited for residential and commercial service applications where precise gap measurement is required. Common installation and maintenance scenarios include motor and compressor bearing checks, heat exchanger fin spacing verification, and general mechanical clearance inspection. The 12-inch leaf length provides enough reach for deep or recessed measurement points. The 0.5-inch blade width accommodates standard gap geometries without interference in tight spaces.

Key Features

• Parallel leaf style for consistent thickness measurement across the full 12-inch blade length
• 0.30 mm nominal thickness targets common mechanical and HVAC service tolerances
• High carbon steel construction resists bending and maintains calibration under repeated use
• 0.5-inch blade width fits standard gap openings without obstruction
• Lightweight at 0.04 pounds for easy single-hand operation in confined spaces

Compatibility

Designed as a general-purpose feeler gauge for use in mechanical, HVAC, refrigeration, and industrial maintenance applications requiring 0.30 mm gap measurement.

Installation Notes

A licensed mechanic, HVAC technician, or industrial maintenance technician typically uses feeler gauges during equipment inspection or assembly. Always power down and de-energize rotating equipment before inserting a gauge blade near moving parts. Do not force the blade into a gap; apply light, consistent pressure to avoid bending the leaf and affecting measurement accuracy. Clean the blade before and after use to prevent contamination from affecting gap readings.