3M Scotch-weld 7100039192 Threadlocker Blue 250 Ml TL42

Product Description

The 3M SCOTCH-WELD 7100039192 is a medium-strength, blue liquid threadlocker in a 250 mL bottle, part of the TL42 series. It is applied to threaded fasteners to resist vibration-induced loosening during service. Designed for use on fasteners ranging from 1/4 inch to 3/4 inch, it achieves fixture in 20 minutes and reaches full cure in 24 hours. The cured adhesive remains operable from -65 degrees F up to 300 degrees F, making it suitable for a broad range of mechanical and industrial assemblies. Removal is accomplished with standard hand tools, keeping disassembly straightforward for maintenance crews.

This threadlocker is intended for use on metal threaded fasteners in mechanical, HVAC, plumbing, and general industrial assemblies where medium clamping strength and serviceable disassembly are required. It is well-suited for residential and light commercial equipment where fasteners must hold securely under vibration but still be removable during routine service. Licensed tradespeople and maintenance technicians working on pumps, motors, blowers, pipe fittings, and similar hardware will find this product appropriate for standard bolt and screw applications in that fastener size range.

Key Features

• Medium-strength formula allows removal with hand tools after cure
• Fixture time of 20 minutes supports efficient workflow on the job
• Full cure achieved in 24 hours at room temperature
• Operating temperature range of -65 degrees F to 300 degrees F
• Breakaway torque of 70 to 160 lb-in provides reliable hold without permanent lock
• Meets MIL-S-46163A military specification for threadlocking compounds
• Blue color aids visual confirmation of application on fastener threads

Compatibility

Designed as an OEM-style medium-strength threadlocker for threaded metal fasteners in the 1/4 inch to 3/4 inch size range across mechanical, HVAC, plumbing, and general industrial applications.

Installation Notes

Applied by licensed mechanics, HVAC technicians, plumbers, and general maintenance tradespeople. Before application, ensure mating threads are clean, dry, and free of oil or old thread compound residue. Power down and de-energize any equipment before working on fastened assemblies. Allow the full 24-hour cure time before returning fasteners to full-load service conditions.