Feeler Gauge Set INSIZE MWSB 3-300 20 Blades Length 300 mm (4605-202)

The INSIZE MWSB 3-300 feeler gauge set with 20 blades, overall length 300 mm, is a manual precision tool for measuring gaps and clearances in mechanical assemblies. Designed for assembly, maintenance and inspection tasks, this feeler gauge set provides a range of blade thicknesses to measure joints, tolerances and spacing with repeatable contact. Its slim, hinged holder keeps blades organized and allows quick selection of the correct thickness during workshop or field work.

Advantages

This feeler gauge set offers a wide range of blade thicknesses in a single, compact holder that is easy to carry and store. The long 300 mm blade length enables access to deeper or recessed gaps compared with shorter sets. Blades are finished for smooth contact and consistent feel, supporting precise measurement of clearances without electrical power or calibration equipment. The hinged design secures blades during transport and allows clear visibility of thickness markings for fast identification.

Suitable for

• Measuring valve clearances and spark plug gaps in engines
• Checking bearing and shaft endplay in rotating machinery
• Verifying mating surfaces and joint clearances during assembly
• Routine maintenance inspections in workshops and on-site service

Key specifications

• Number of blades: 20
• Overall blade length: 300 mm
• Blade material: spring steel (finish for smooth contact)
• Holder type: hinged organizer for secure storage and fast selection
• Intended use: manual gap and clearance measurement in mechanical applications

How to use

Select the blade or combination of blades that matches the expected clearance and insert them between the mating surfaces or into the gap to be measured. Slide the blade gently to feel resistance; a correct fit will have slight drag without forcing. For tighter tolerances, stack multiple blades by layering until the proper feel is achieved, then add the individual thickness values to determine the total gap. After use, fold blades back into the holder to protect edges and maintain organization.

Usage recommendations

Store the feeler gauge in a dry environment and wipe blades clean after use to prevent corrosion. Avoid bending blades beyond their elastic limit to preserve measurement accuracy. For consistent results, use the feeler gauge at room temperature and ensure mating surfaces are free of debris, oil or burrs before measuring.