Sealed Power SPG-1 Plastigage Bearing Clearance Measuring Tool Green .001-.003 Inch

The Sealed Power SPG-1 Plastigage is an essential precision measuring tool for checking bearing clearances during engine assembly and rebuild. This green plastigage measures clearances ranging from 0.001 to 0.003 inches (0.025 to 0.076 mm), making it ideal for checking main and rod bearing clearances in automotive engines.

Key Features:

• Precision clearance measurement range: 0.001 to 0.003 inches (0.025 to 0.076 mm)
• Made from special extruded plastic thread with accurately controlled crush properties
• Packaged in calibrated envelope that protects the material and serves as a measuring scale
• Fast and accurate method for verifying proper bearing clearances during installation
• Contains enough material to check both main and connecting rod clearances for one engine
• Round, smooth, and flexible through wide temperature range
• Remains accurate through normal atmospheric variations in temperature and humidity

Plastigage works by placing a strip of the material between the bearing and journal, torquing to specification, then removing and comparing the flattened width against the calibrated envelope scale. This simple yet effective method provides reliable clearance readings essential for proper engine assembly and longevity. An indispensable tool for engine builders, mechanics, and DIY enthusiasts performing engine rebuilds.