Spi 91-383-0 Feeler Gauge 0.03 in Parallel Leaf 12 in

Product Description

The SPI 91-383-0 is a single parallel-leaf feeler gauge used to measure clearances and gaps in mechanical assemblies. Manufactured from high carbon steel, it provides consistent thickness readings at 0.03 inches across its full 12-inch length. The parallel leaf profile ensures uniform contact along the entire blade, which is essential when checking valve clearances, bearing fits, spark plug gaps, and similar precision-fit applications. Machinists, HVAC technicians, and mechanical service professionals use this gauge as a reliable go/no-go or precision measurement tool during assembly and calibration work.

This feeler gauge blade is suited for both shop and field use wherever a 0.03-inch clearance measurement is required. Common applications include checking air gaps on motor components, verifying clearances on compressor valve plates, inspecting gasket seating surfaces, and general mechanical assembly work. The 12-inch length allows access into deeper recesses than shorter blades, and the 0.5-inch width provides a stable contact surface for accurate readings. It is typically used as a standalone blade or alongside a set of assorted feeler gauge leaves.

Key Features

• Parallel leaf profile ensures uniform thickness along the full 12-inch blade length
• High carbon steel construction provides durability and resistance to wear during repeated use
• 0.03-inch nominal thickness for precision gap and clearance measurements
• 0.5-inch blade width delivers stable surface contact
• 12-inch length allows reach into deep or tight assembly clearances

Compatibility

Designed as a general-purpose feeler gauge blade suitable for use in mechanical, HVAC, and plumbing service applications requiring a 0.03-inch clearance measurement.

Installation Notes

Feeler gauges are a measurement tool and require no installation, but should be used by qualified technicians familiar with clearance specifications for the equipment being serviced. Always power down and de-energize equipment before inserting a feeler gauge into electrically live assemblies. Keep blades clean and free of oil or debris to maintain measurement accuracy. Do not force or bend the blade, as this will permanently alter the calibrated thickness.