Spi 91-405-1 Feeler Gage 0.45mm Parallel Leaf

Product Description

The SPI 91-405-1 is a single-leaf feeler gage used to measure precise gaps and clearances in mechanical assemblies. The leaf measures 0.45 millimeters (mm) in thickness, 0.5 inches wide, and 12 inches long with a parallel profile. Constructed from high carbon steel, it delivers consistent stiffness and resistance to deformation across its full length. This tool is used by machinists, millwrights, HVAC technicians, and engine mechanics wherever accurate gap measurement is required during assembly, alignment, or adjustment tasks.

This feeler gage leaf suits general-purpose gap measurement in residential and commercial service environments. Common applications include setting valve clearances, checking spark plug gaps, measuring bearing clearances, and verifying alignment tolerances on mechanical equipment. The parallel leaf style provides a uniform cross-section along the full 12-inch length, allowing the same thickness reading at any point of insertion. It is well suited for use as a standalone gage or as a replacement leaf in a feeler gage set.

Key Features

• 0.45 mm leaf thickness for precise gap measurement
• Parallel leaf profile ensures uniform thickness across the full 12-inch length
• High carbon steel construction for stiffness and durability
• 0.5 inch leaf width provides a practical contact surface for most gap applications
• 12-inch length accommodates deep-reach measurement needs

Compatibility

Designed as a standard parallel-leaf feeler gage suitable for general mechanical gap measurement applications across a wide range of equipment types.

Installation Notes

Feeler gages require no installation but should be used by qualified technicians familiar with gap measurement procedures. Clean mating surfaces before measuring to avoid false readings from debris or burrs. Do not force the leaf into tight gaps, as bending or kinking will permanently alter accuracy. Store flat and away from moisture to prevent corrosion of the carbon steel leaf.