3M Scotch-weld 7100039190 Threadlocker Blue 10 Ml TL42

Product Description

The 3M SCOTCH-WELD 7100039190 is a medium-strength, blue liquid threadlocker supplied in a 10 mL bottle. It is designed to secure threaded fasteners against loosening caused by vibration and dynamic loads. The formula locks and seals threads in a single step, curing at room temperature without special equipment. With a fixture time of 20 minutes and a full cure time of 24 hours, it fits standard maintenance and repair workflows. The cured bond withstands temperatures from -65 degrees F to 300 degrees F, making it appropriate for mechanical assemblies that see moderate heat cycles. Plumbers, HVAC technicians, and mechanical maintenance professionals commonly apply this product during equipment installation and scheduled service work.

Series TL42 threadlocker is suited for fastener sizes ranging from 1/4 inch to 3/4 inch in diameter. It is applied in residential, commercial, and light industrial maintenance scenarios wherever threaded connections must resist vibration-induced loosening without requiring permanent disassembly prevention. The medium-strength formulation allows removal with standard hand tools, making it practical for components that are serviced periodically. The liquid consistency allows the product to wick into pre-assembled fasteners as well as freshly assembled ones.

Key Features

• Medium strength bond — removable with hand tools after cure
• Fixture time of 20 minutes supports efficient assembly workflows
• Covers fastener sizes from 1/4 inch to 3/4 inch
• Operating temperature range of -65 degrees F to 300 degrees F
• Breakaway torque range of 70 to 160 lb./inch for positive retention without permanent lock
• Meets MIL-S-46163A military specification standard

Compatibility

Designed for use on standard threaded metal fasteners in the 1/4 inch to 3/4 inch size range, consistent with typical applications in HVAC, plumbing, and general mechanical assembly.

Installation Notes

Clean and degrease fastener threads thoroughly before applying threadlocker to ensure proper adhesion. Apply a small amount directly to the threads and assemble the fastener before the working time of 20 minutes elapses. Allow a full 24-hour cure before applying load to the fastener. To remove after cure, apply heat or use standard hand tools as required by the medium-strength formulation.