Loctite / Weicon / Permatex / ThreeBond / Anaerobic Adhesive Cross-Reference — Threadlockers, Gasket Makers, Retaining Compounds, Instant CA

Complete cross-reference between Loctite, Weicon, Permatex, ThreeBond and Anabond anaerobic adhesive products. Threadlockers (Loctite 222/243/262/271/277/290 ↔ Weicon AN 302-6, Permatex 24000-27200, ThreeBond 1360/1401/1360F), retaining compounds (Loctite 601/638/641/648/660/680 ↔ Permatex 68050, Weicon AN 305-11, ThreeBond 1373/1360W), gasket makers (Loctite 510/515/518/574/5188 ↔ Permatex 54540/59214/51817, Weicon AN 305-72, ThreeBond 1110F/1211/1215/1216), CA instants (Loctite 401/406/410/480/495/496 ↔ Permatex 82190, ThreeBond 1741/1747), and surface prep (Loctite 7063/7649/7471 ↔ Permatex 82360). Cross-referenced by chemistry and cure characteristics.

Loctite / Weicon / Permatex / ThreeBond / Anabond cross-reference

Anaerobic threadlockers, retaining compounds and gasket makers ship under half a dozen brand names but the underlying chemistry is a short list of methacrylate ester resins with different accelerator packages. Once you know the target strength, gap fill and temperature range of the joint, any of the vendors below has a product that meets the same specification — the challenge is matching brand-to-brand. This table maps every commonly stocked Loctite anaerobic and instant adhesive to the closest equivalent from Henkel Loctite, Weicon (Germany), Permatex (US), ThreeBond (Japan), Anabond (India) and Permabond (UK). Equivalence is by function and specification, not by chemical composition; always confirm the specific data-sheet parameters before substituting on a critical joint.

Threadlockers — anaerobic, cure without oxygen once trapped in the thread

The colour code (purple/blue/red/green) is shared across most brands: purple = low, blue = medium, red = high, green = wicking. When identifying an unbranded product, colour is the fastest first-pass indicator. For critical joints, always confirm the vendor product code and its published strength — some brands offer intermediate grades not covered by the strict Loctite colour scheme.

Retaining compounds — concentric-part press- and slip-fit bonding

Gasket makers — form-in-place flange gaskets

Loctite 518 equivalent: Permatex 54540 (High-Temperature Anaerobic Gasket Maker), Weicon AN 305-73, ThreeBond 1216, Permabond A136. All rated to 150 °C on machined-metal flanges up to 0.25 mm gap; the industry default for pump housings, gearbox covers and valve bonnets. ThreeBond 1216 is the OEM specification on many Japanese-made industrial gearboxes; Loctite 518 is the OEM spec on European-made ones. Both cure to a flexible film with equivalent bond strength on carbon-steel flanges.

Instant adhesives (cyanoacrylate, CA)

Surface preparation — cleaners, primers, activators

Loctite 707 equivalent: The legacy Locquic Primer T (SF 707) has been superseded by SF 7471 (Activator T). All modern Weicon and Permatex activator sprays for anaerobic cure work as direct 707 replacements. Loctite 7649 (Activator N, solvent-lite) is preferred for regulatory-restricted workshops; the older 707 is chlorinated-solvent-based and increasingly restricted.

Structural adhesives (methacrylate two-part)

Chemistry & substitution notes

• Anaerobic thread- and gasket-lockers cure by polymerisation of a methacrylate ester when trapped between two clean-metal surfaces (in the absence of oxygen and in contact with the metal activator). All brands use the same base chemistry — peroxide-cured methacrylate. The difference between brands is the accelerator package, the viscosity modifier, and any tackifier used for wicking or gel behaviour.
• CA (cyanoacrylate) instants polymerise on contact with any weak base (water vapour, amine, hydroxyl on the substrate). All brands use ethyl or methyl cyanoacrylate monomer; toughened grades add a rubber-block copolymer to the monomer.
• Silicone RTV gasket makers cure by moisture absorption from the air. All brands use a polydimethylsiloxane base with a crosslinker; the difference is the cure chemistry (acetoxy vs oxime vs alkoxy) and any oil-resistance filler. Do not substitute an acetoxy-cure silicone for an alkoxy-cure one on aluminium engine covers — the acetic-acid by-product corrodes aluminium.
• Substitution risk is highest on: (a) high-temperature or PWHT joints (verify each vendor's rated max temp), (b) joints with unusual chemical exposure (fuels, solvents — each vendor's chemical-resistance chart differs), and (c) joints under class-society or OEM warranty (specifically-named product may be required for warranty compliance).

Common questions — brand-to-brand equivalence

Q: Is Loctite 243 the same as Permatex 24200? Yes — both are medium-strength blue anaerobic threadlockers for M6-M20 fasteners, rated to +180 °C, removable with hand tools. They differ slightly in cure time on inactive substrates but the joint acceptance behaviour is identical.

Q: What is the Weicon equivalent of Loctite 243? Weicon AN 302-43. Same colour (blue), same strength class (medium), same thread range (M6-M20), same temp range (-55 to +180 °C).

Q: Is ThreeBond 1216 the same as Loctite 518? Yes for the functional joint: both are anaerobic flexible gasket makers for machined-metal flanges up to 0.25 mm gap. ThreeBond 1216 is the OEM specification on most Japanese-built industrial gearboxes and marine main engines; substituting Loctite 518 is accepted by the majority of OEMs but confirm before applying to a warranty-critical joint.

Q: Is Permatex 54540 the Loctite 515 equivalent? Permatex 54540 (High-Temperature Anaerobic Gasket Maker) is closer to Loctite 518 in general use, though both 515 and 518 cover the general-machined-flange gasket-maker duty. For direct equivalent-strength substitution, Permatex 51817 (Aviation Form-A-Gasket) is the closer 515 match.

Q: Where is a good source for the Loctite → Permatex conversion PDF? Henkel publishes an official Loctite to Permatex Cross-Reference Guide (downloadable from the Henkel/Loctite MRO website). This document supplements that with Weicon, ThreeBond, Anabond and Permabond equivalents for European and Asian workshops.

Related references & cBallast products

• Loctite adhesive selection chart — threadlockers, gasket makers, cleaners (by strength & gap)
• Loctite cross-reference equivalents chart
• Loctite SF 7063 cleaner-degreaser 400 ml aerosol
• Loctite 518 flange sealant
• Loctite 243 medium-strength threadlocker
• Loctite 271 high-strength threadlocker
• Weicon adhesives on cBallast
• Permatex adhesives on cBallast
• ThreeBond adhesives on cBallast
• Henkel industrial adhesives on cBallast

Cross-references are compiled from published product data sheets and manufacturer-published equivalence charts. Product formulations change; always verify the specific data-sheet parameters (strength, gap, temperature, chemical compatibility) before substituting on a critical joint. Loctite is a Henkel AG & Co. KGaA trademark; Permatex is a trademark of Illinois Tool Works Inc.; ThreeBond is a trademark of ThreeBond Holdings Co. Ltd.; Weicon is a trademark of Weicon GmbH & Co. KG.

Document provided as a reference for technicians servicing installed equipment. Trademarks and copyright remain the property of Multi-vendor (Henkel, Weicon, Permatex, ThreeBond, Anabond, Permabond). Consult Multi-vendor (Henkel, Weicon, Permatex, ThreeBond, Anabond, Permabond) or your service representative for the current revision before performing any maintenance or warranty work.