3M 7100039221 Threadlocker TL43 Blue 250 Ml

Product Description

The 3M 7100039221 is a medium-torque, oil-tolerant threadlocker formulated for general-purpose fastener retention in demanding service environments. Sold as Scotch-Weld Threadlocker TL43 in a 250 mL bottle, this blue-grade anaerobic adhesive cures in the thread gap to resist vibration, shock, and corrosion without permanently locking the fastener. Assembled joints remain removable with standard hand tools, making it practical for components that require periodic maintenance or adjustment. Plumbers, HVAC technicians, electricians, and industrial maintenance professionals use TL43 wherever moderate-strength thread retention is needed on metal fasteners exposed to oil or lubricant contamination.

TL43 is suited for residential and light commercial maintenance applications where fasteners are subject to vibration or thermal cycling. Its oil-tolerant chemistry allows application to lightly oiled threads without requiring solvent cleaning in many field conditions, saving time during service calls. Typical uses include set screws, pipe fittings, machine bolts, and equipment panels where hand-tool disassembly must remain possible after cure.

Key Features

• Medium torque removal strength — assembled joints are removable with standard hand tools
• Oil-tolerant formulation — bonds to lightly oiled threads without full degreasing in many applications
• Resists vibration and shock to prevent fastener loosening in service
• Inhibits corrosion at the thread interface
• Blue-grade general-purpose formula suitable for a wide range of metal fastener sizes
• 250 mL bottle provides sufficient volume for high-frequency field or shop use

Compatibility

Designed as a general-purpose medium-strength threadlocker for use on metal threaded fasteners in HVAC, plumbing, electrical, and industrial maintenance applications where oil-tolerant adhesion and hand-tool removability are required.

Installation Notes

Application is typically performed by maintenance technicians and trade professionals working on threaded metal assemblies. Clean threads of heavy grease or debris before applying; the oil-tolerant formula accommodates light oil films but is not a substitute for proper surface preparation on heavily contaminated fasteners. Allow adequate cure time before returning the assembly to service and before applying load or torque. Follow all applicable safety data sheet guidance for skin contact and ventilation when working with anaerobic adhesives in enclosed spaces.

Technical Specifications

• Strength Grade: Medium (Blue)
• Volume: 250 mL
• Removability: Hand tool removable
• Oil Tolerance: Oil tolerant
• Weight: 0.7 pounds
• UPC: 00051115251405

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100039221