3M Scotch-weld 7100039219 Threadlocker Blue 10 Ml

Product Description

The 3M SCOTCH-WELD 7100039219 is a medium-strength, blue liquid threadlocker designed to secure threaded fasteners and prevent loosening caused by vibration and dynamic loads. Packaged in a 10 mL bottle, this product belongs to the TL43 series and delivers a breakaway torque range of 110 to 220 lb-in, making it appropriate for fasteners from 0.5 inches to 1 inch in diameter. It achieves fixture in 20 minutes and reaches full cure in 24 hours. Fasteners can be removed using standard hand tools, which differentiates medium-strength formulas from higher-strength permanent grades. HVAC technicians, plumbers, electricians, and mechanical contractors use this product on serviceable assemblies where periodic disassembly is expected.

This threadlocker is suited for residential and light commercial mechanical assemblies where vibration resistance is required without permanent bonding. Typical applications include threaded pipe fittings, equipment mounting hardware, set screws, and panel fasteners across HVAC, plumbing, and electrical installations. The medium-strength formulation is the standard choice when fasteners must be removable with hand tools during routine maintenance or equipment servicing.

Key Features

• Medium-strength liquid formula — removable with standard hand tools after cure
• Breakaway torque of 110 to 220 lb-in — suitable for fasteners 0.5 inches to 1 inch
• Fixture time of 20 minutes with full cure in 24 hours
• Operating temperature range from -65 degrees F to 300 degrees F
• Compact 10 mL bottle — practical for field service kits and tool bags
• Blue color coding distinguishes medium-strength grade from red permanent and purple low-strength grades

Compatibility

Designed for use on metal threaded fasteners in the 0.5-inch to 1-inch diameter range across general mechanical, HVAC, plumbing, and electrical assemblies requiring a serviceable medium-strength threadlocking compound.

Installation Notes

Apply to clean, dry, oil-free threads before assembly; contamination will inhibit cure and reduce holding strength. Allow the assembly to remain undisturbed for the full 20-minute fixture time before handling, and do not apply full service loads until the 24-hour cure cycle is complete. This product is intended for use by licensed trade professionals or experienced technicians familiar with fastener torque requirements and applicable mechanical codes. Store the bottle capped and away from heat sources when not in use.