LOCTITE 243 — medium-strength blue anaerobic threadlocker, oil-tolerant, hand-tool disassemblable. Prevents vibration loosening of bolts and fasteners. Multi Trade Combines stocks genuine Loctite (Henkel) in Guwahati for Northeast India; price on request.
LOCTITE 243 is the world's most widely used medium-strength anaerobic threadlocker — the blue-bottle standard found in maintenance departments, fabrication workshops and assembly lines from small engineering shops in Guwahati's industrial estates to large petrochemical plants in Assam's oil belt. Multi Trade Combines stocks genuine LOCTITE 243 (Henkel) in Guwahati, available for counter purchase and bulk supply to industrial customers across Northeast India. As an authorised Loctite dealer, we can confirm you receive genuine product — not counterfeit material, which is a real risk in the adhesives market.
The chemistry behind LOCTITE 243 is elegant: the liquid adhesive contains anaerobic monomers that polymerise only in the absence of oxygen and the presence of metal ions. A single drop applied to a bolt thread remains liquid in the open bottle but cures to a rigid thermoset plastic the moment the bolt is assembled into a nut or tapped hole and oxygen is excluded. The result is a thread-filling cure that eliminates the loosening effect of vibration, shock and thermal cycling — the three primary causes of fastener back-off in industrial and construction equipment.
The medium-strength formulation is the key to LOCTITE 243's dominance: it holds bolt joints securely in service but allows disassembly with standard hand tools (spanner or socket set), making it the correct product for bolts and set-screws on equipment, pumps, gearboxes, conveyor drives and machinery that require periodic maintenance. High-strength red LOCTITE 271 is used where permanent locking is required; medium-strength blue 243 is used everywhere else. The oil-tolerant formulation — a distinguishing feature from earlier product generations — means that lightly oiled or residually greased fasteners can be locked without degreasing, a significant time saving on maintenance overhauls.
| Brand | LOCTITE (Henkel) |
|---|---|
| Category | Adhesives & Sealants |
| Type | Anaerobic threadlocker — medium strength |
| Key specs | Medium-strength · blue · oil-tolerant |
| Colour | Blue |
| Fixture Time | 10 min (on steel at 22°C) |
| Full Cure | 24 hours |
| Temperature Range | -55°C to +150°C |
| Availability | In stock — price on request |
Industrial maintenance departments are the primary users. Tea-estate factories across Upper and Lower Assam use LOCTITE 243 to lock fasteners on CTC rollers, fermentation drums, conveyor drives and drying equipment during annual shutdown maintenance — preventing the vibration loosening that is a chronic problem on high-speed rotating machinery. Oil-sector maintenance teams at OIL India and ONGC field installations in Sibsagar, Duliajan and Jorhat use it as standard for pipe-flange stud bolts and pump-mounting bolts. BCPL and Numaligarh Refinery maintenance contractors follow Henkel-recommended threadlocking specifications that include LOCTITE 243 for medium-duty applications. Auto workshops in Guwahati use it for engine mount bolts, ancillary bracket fasteners and suspension components. Machinery repair shops use it for set-screw locking in keyway-and-set-screw assemblies. Construction equipment maintenance crews apply it to bucket-attachment bolts, cab-mounting fasteners and track-pad bolts on excavators and dozers. We supply both small retail tubes and bulk quantities to industrial buyers across the Northeast.
LOCTITE 243 is often used alongside LOCTITE Primer 7649 (Activator) to accelerate cure on passive metals (stainless steel, aluminium), LOCTITE 271 (high-strength red threadlocker) for permanent fastener joints, LOCTITE 648 (retaining compound) for shaft-bore and bearing-housing fits, and LOCTITE 5900 (form-a-gasket) for flange sealing. A torque wrench ensures bolts are assembled to the correct clamping force before the adhesive cures. Multi Trade Combines stocks the full LOCTITE range — ask for a technical recommendation based on your specific joint type, substrate metal and disassembly requirement.
LOCTITE 243 is a medium-strength anaerobic threadlocking adhesive that prevents bolts, screws and studs from loosening due to vibration, shock or thermal cycling. It is applied as a single drop on the thread of the bolt before assembly; the adhesive cures in the absence of air (anaerobic) when confined between close-fitting metal surfaces, forming a rigid thermoset that locks the joint without increasing torque. Assembled joints can be disassembled with standard hand tools, making it suitable for bolts and studs that need periodic maintenance access. It is oil-tolerant, eliminating the need to degrease lightly oiled parts before application.
Yes. LOCTITE 243 is compatible with most metals including steel, stainless steel, brass, aluminium and zinc-plated fasteners. On passive metals such as stainless steel, aluminium and some plated surfaces, a LOCTITE Activator (Primer 7649 or Primer N) can be used to accelerate cure time in the absence of an active metal catalyst. Multi Trade Combines stocks LOCTITE 243 and associated primers in Guwahati — call +91 91812 13332 for quantity pricing and technical advice.