Spi 91-358-2 Feeler Gage Blade 0.005 in Parallel Leaf

Product Description

The SPI 91-358-2 is a single parallel-leaf feeler gage blade used to measure and set precise clearances in mechanical assemblies. At 0.005 inches thick, 0.5 inches wide, and 12 inches long, this blade covers a wide reach for checking gaps in engine components, valve trains, bearing clearances, and equipment with tight tolerance requirements. Constructed from high-carbon steel, the blade resists wear and maintains dimensional accuracy through repeated use. Machinists, HVAC technicians, and field service professionals use feeler gage blades like this when performing precision adjustments on motors, compressors, and rotating equipment.

This blade is suited for both shop and field applications where a single-thickness gage leaf is needed for go/no-go clearance checks or gap setting. The 12-inch parallel leaf length allows access to recessed or deep clearance points that shorter blades cannot reach. The 0.5-inch width provides a stable contact surface for consistent readings. Common applications include motor air-gap measurement, burner electrode gap setting, valve lash adjustment, and general mechanical assembly work across residential and commercial trades.

Key Features

• 0.005-inch thickness for precise fine-clearance measurement
• Parallel leaf style maintains consistent width across full 12-inch length
• 0.5-inch blade width provides stable contact surface
• High-carbon steel construction for durability and dimensional stability
• Single-leaf format allows use as a standalone blade or replacement in a gage set

Compatibility

Designed as a standard parallel-leaf feeler gage blade suitable for general mechanical clearance measurement across a wide range of trade and industrial applications.

Installation Notes

Insert the blade into the clearance gap with light hand pressure only — forcing the blade can bend or distort it and produce inaccurate readings. Clean contact surfaces before measuring to remove debris that would affect results. No power shutdown is required for most gap-setting tasks, but always follow equipment-specific lockout/tagout procedures when working on energized machinery. Store blades flat and protected from moisture to prevent corrosion and maintain calibration accuracy.