Loctite 233500 Threadlocker Paste 250 Ml Low Strength

Product Description

The LOCTITE 233500 is a low-strength anaerobic threadlocker in paste form, engineered for sealing and locking threaded pipe fittings and fasteners. Supplied in a 250 mL tube, this Series 564 compound cures to an off-white color and is designed for applications where disassembly with hand tools is required after service. It handles fastener sizes larger than 2 inches or 50 mm and tolerates operating temperatures from -65 degrees F to 300 degrees F. Licensed plumbers and pipefitters typically apply it to threaded connections where low-strength, removable sealing is the priority.

This threadlocker is suited for residential and commercial plumbing and HVAC piping systems where NPT threaded steel fittings are common. The product delivers a breakaway torque of 300 lb-in on 3/8-inch NPT steel pipe tees and plugs after a full 72-hour cure at 22 degrees C. Its paste consistency aids application on vertical or overhead joints where liquid compounds may run. Installers working on gas piping, hydronic heating lines, and compressed-air systems will find it appropriate for joints that may require periodic disassembly for inspection or replacement.

Key Features

• Low-strength formulation allows removal with standard hand tools or heat
• Paste form stays in place on vertical and overhead threaded joints
• Full cure in 72 hours at room temperature
• Operating range of -65 degrees F to 300 degrees F
• Rated for fastener and pipe sizes greater than 2 inches or 50 mm
• 300 lb-in breakaway torque on 3/8-inch NPT steel pipe tees and plugs after full cure

Compatibility

Designed as an OEM-style thread-sealing compound for NPT steel pipe fittings and threaded fasteners in plumbing, HVAC, and industrial piping applications where low-strength, removable locking is required.

Installation Notes

Application is typically performed by licensed plumbers, pipefitters, or HVAC technicians. Shut off and depressurize the system before disassembling or assembling any threaded connections. Apply the paste compound evenly to the male threads before assembly and allow the full 72-hour cure time before returning the system to service pressure. Follow applicable code requirements under the IPC or IFGC for thread sealants used on gas or potable water piping.