Starrett 667S-4 Feeler Gage 0.004 in Parallel Leaf 12 in

Product Description

The STARRETT 667S-4 is a single parallel-leaf feeler gage blade used to measure and verify gap clearances with precision. Manufactured from stainless steel, this blade measures 0.004 inches thick, 0.5 inches wide, and 12 inches long. The parallel-leaf design provides a consistent cross-section along the full length of the blade, making it reliable for applications where uniform contact across the gap is required. HVAC technicians, plumbers, and mechanical service professionals use feeler gage blades like this one when setting valve clearances, checking flange gaps, and verifying tolerances during equipment installation or service.

This blade is well suited to residential and light commercial service work where accurate gap measurement is a routine part of diagnostics or installation. It fits standard feeler gage setups and is commonly used when checking burner orifice clearances, heat exchanger joint fits, pump seal faces, or mechanical component tolerances. The stainless steel construction resists corrosion and fluid contamination, which is practical in wet or chemically active service environments typical in plumbing and HVAC work.

Key Features

• 0.004 inch blade thickness for fine-tolerance gap measurement
• Parallel-leaf profile maintains consistent thickness along the full 12 inch length
• Stainless steel construction resists corrosion and wear
• 0.5 inch blade width provides stable contact surface
• 12 inch length allows reach into deep or confined clearance points

Compatibility

Designed as a standard replacement parallel feeler gage blade compatible with typical feeler gage handles and sets accepting 0.5 inch wide, 12 inch parallel leaves.

Installation Notes

Feeler gage blades are used by HVAC technicians, plumbers, and mechanical service professionals as a measurement tool — no power shutoff is required for the blade itself, but always de-energize or shut off the equipment being measured before inserting the blade into a gap. Do not bend, nick, or force the blade, as deformation will affect measurement accuracy. Wipe blades clean after use and store them dry to preserve the stainless steel finish and calibrated thickness.