Spi 91-343-4 Parallel Feeler Gage Set 20 Piece

Product Description

The SPI 91-343-4 is a 20-piece parallel feeler gage set designed for precision gap measurement across a range of 0.001 to 0.025 inches. Each leaf is made from steel and measures 6 inches in length and 0.5 inches in width. The parallel leaf style maintains consistent width along the full length of each blade, ensuring accurate contact across the measured surface. This set is used by HVAC technicians, mechanics, machinists, and millwrights who need reliable gap measurement during equipment alignment, adjustment, and inspection tasks.

This feeler gage set suits a wide range of trade applications including valve clearance checks, bearing fits, spark plug gap setting, flange alignment, and equipment leveling verification. The 20 graduated leaves cover the most commonly needed thicknesses in a single compact set, making it practical for both bench work and field service. Its steel construction holds up to repeated use in shop and mechanical room environments.

Key Features

• 20 steel leaves ranging from 0.001 to 0.025 inches in 20 graduated steps
• Parallel leaf style provides consistent 0.5-inch width along the full 6-inch length
• Steel material for durability and dimensional stability
• Compact closed length of 6 inches for easy storage and transport
• Covers the most common gap measurement increments used in HVAC, mechanical, and machine trade work

Compatibility

Designed as a general-purpose parallel feeler gage set suited for gap measurement tasks in HVAC, plumbing, mechanical, and machine shop applications where blade thicknesses from 0.001 to 0.025 inches are required.

Installation Notes

Feeler gages are hand tools requiring no power source or special installation. Select the appropriate leaf or combination of leaves for the target gap and insert with light drag resistance as the acceptance criterion. Keep leaves clean and lightly oiled when stored to prevent corrosion and maintain measurement accuracy. Do not force leaves into tight gaps or bend them, as this will compromise dimensional accuracy.