Starrett 52869 Feeler Gage 0.03mm Parallel Leaf

Product Description

The STARRETT 52869 is a parallel-leaf feeler gage designed for precise gap and clearance measurement in mechanical assembly, engine work, and machine calibration. The leaf measures 0.03 mm thick, 12.7 mm wide, and 300 mm long, providing consistent contact across the full blade length. Constructed from tempered steel, the blade resists flex and wear under repeated use. Machinists, millwrights, engine rebuilders, and industrial maintenance technicians use feeler gages like this one to verify tolerances on valve clearances, bearing fits, and mating surfaces where dimensional accuracy is critical.

This feeler gage leaf is suited for fine-tolerance measurement tasks in both shop and field environments. The 0.03 mm thickness places it at the thin end of the range, making it appropriate for tight clearance checks on precision components. The 300 mm blade length accommodates wider assemblies and allows the technician to seat the gage fully into deep or recessed gaps. It is typically used as a standalone leaf or alongside a set of additional thickness leaves to bracket a target clearance.

Key Features

• Parallel leaf style ensures uniform thickness along the full 300 mm blade length
• 0.03 mm thickness for fine-tolerance and close-clearance measurement
• 12.7 mm blade width provides stable contact on flat mating surfaces
• Tempered steel construction for durability and resistance to deformation
• Single-leaf format for use standalone or as part of a multi-leaf set

Compatibility

Designed as an OEM-style replacement or supplemental leaf compatible with standard feeler gage sets and holders that accept parallel-style blades of equivalent width and length.

Installation Notes

Feeler gages are hand tools requiring no power source, but the components being measured should be at rest and, where applicable, de-energized or shut down before inserting the blade into a clearance gap. Insert the leaf with light, consistent hand pressure — do not force the blade, as this can spring the leaf and alter its calibrated thickness. Clean blade surfaces before and after use to prevent measurement error from debris buildup. Follow the equipment manufacturer's specified clearance tolerances when interpreting readings.