Metlok Private Limited manufactures Low Strength Screw Locker. Metlok Private Limited is an ISO 9001: 2000 certified company. Low Strength Screw Locker or My-T-Lok ® 312 is a medium viscosity and anaerobic adhesive. These are used to lock and seal screws, nuts, bolts and studs, in a wide variety of applications where easy removal is necessary. The Low Strength Screw Lockers are also used for very large diameter screws like damper assemblies of railway bogies.