Starrett 52801 Feeler Stock Roll 0.004 in Tempered Steel

Product Description

The STARRETT 52801 is a tempered steel feeler stock roll used to measure and set precise gaps in mechanical assemblies, valve clearances, carburetor settings, and similar close-tolerance applications. At 0.004 inches thick and 0.5 inches wide, this roll provides a thin, consistent ribbon of material that can be cut to any working length on the job. The 25-foot length gives technicians and machinists a lasting supply from a single roll. Tempered steel construction maintains flatness and resists distortion under repeated use, making it a reliable bench and field calibration tool across HVAC, engine service, and precision mechanical trades.

This feeler stock roll is suited for residential and commercial maintenance environments where technicians need to verify or set tight clearances. Common applications include setting valve lash on combustion equipment, checking bearing clearances, verifying burner orifice gaps, and fitting mechanical seals. The roll format allows the user to cut a custom-length strip for confined spaces or extended reach tasks. It is used by HVAC technicians, diesel and gas engine mechanics, machinists, and millwrights in both shop and field settings.

Key Features

• 0.004 inch thickness for precise gap measurement in tight-tolerance assemblies
• 0.5 inch width provides a stable, easy-to-handle strip for most clearance checks
• 25-foot roll length allows on-demand cutting to any required strip length
• Tempered steel construction maintains dimensional stability and resists bending set
• Roll format reduces waste compared to fixed-length feeler stock

Compatibility

Designed as a general-purpose feeler stock roll suitable for use in any application requiring 0.004 inch gap measurement or shim stock, including HVAC combustion equipment service, engine valve adjustment, and precision mechanical assembly work.

Installation Notes

Cut strips to the required length using metal shears or tin snips rated for light-gauge steel. Power down or shut off all equipment before inserting feeler stock into rotating or pressurized assemblies. Edges of cut strips may be sharp — handle with appropriate cut-resistant gloves. Discard strips that show kinks, bends, or surface corrosion, as deformation will produce inaccurate gap readings.