Loctite Cross-Reference & Equivalents Chart

Cross-reference chart compiled by cBallast. 1-page PDF; the full content is on this page.

Brand

Loctite (Henkel)

Subject

Anaerobic threadlockers, sealants, gasket makers, retainers

Document type

Cross-reference chart

Reference

Henkel Loctite TDS

Issued

2026-07-05

Pages

Format

Web page and PDF

Loctite anaerobic + activator cross-reference chart. Maps each common Loctite grade (222, 242, 243, 262, 270, 271, 272, 277, 290, 510, 515, 518, 542, 545, 567, 577, 620, 638, 641, 648, 5910, SF7649, SF7800, MR5923) to its function, strength, viscosity, colour and the direct generic-or-competitor equivalent from Permatex, Weicon, Threebond and Krylex. Includes selection rules: match function → strength → viscosity → temperature range → substrate before substituting.

Loctite Cross-Reference & Equivalents Chart

A Loctite grade is defined by its function (threadlock, thread sealant, gasket, retainer, activator, primer), its strength (low removes with hand tools, medium with hand tools plus heat, high needs heat above 250 °C) and its viscosity (thin wicks into assembled threads, thick fills large gaps). Two Loctite grades with the same three attributes are functionally interchangeable, and so is a competitor product that matches them.

Loctite	Function	Strength	Viscosity mPa·s	Colour	Generic / competitor equivalent
222	Threadlocker	Low	900	Purple	Permatex 24200, Weicon AN 302-22
242	Threadlocker	Medium	1250	Blue	Permatex 24240, Threebond 1401B, Krylex KL42
243	Threadlocker	Medium	2000	Blue	Permatex 27200, Weicon AN 302-43
262	Threadlocker	High	3500	Red	Permatex 27100, Krylex KL62
270	Threadlocker	High	400	Green	Permatex 27400, Weicon AN 302-70
271	Threadlocker	High	500	Red	Permatex 27200, Threebond 1305, Krylex KL71
272	Threadlocker (HT)	High	1500	Red	Permatex 27272 (up to 232 °C)
277	Threadlocker (HD)	Very high	4000	Red	Permatex 27700, for M20 and larger
290	Wicking / repair	Medium	12	Green	Permatex 29000, Weicon AN 305-16 — penetrates assembled threads
510	Gasket maker	—	400000	Pink	Permatex 51813, Threebond 1215 — rigid faces
515	Gasket maker	—	500000	Purple	Permatex 51817, flexible flanges
518	Gasket maker	—	450000	Red	Permatex 51813, Threebond 1216B
542	Thread sealant	—	3500	Brown	Permatex 54540, Weicon AN 306-42 — up to R 3/8
545	Thread sealant	—	30000	Brown	Permatex 54540 paste, Threebond 1305 — HP hydraulics
567	Thread sealant	—	110000	White	Permatex 56521, Weicon AN 306-72 — up to NPT 3, stainless-safe
577	Thread sealant	—	85000	Yellow	Permatex 55654, Threebond 1215 — general purpose
620	Retaining compound	High (HT)	8500	Green	Permatex 68050, to 232 °C
638	Retaining compound	High	2500	Green	Permatex 68050 Green, Threebond 1373 — bearings, sleeves
641	Retaining compound	Medium	600	Yellow	Permatex 64000 — press-fits that dismantle
648	Retaining compound	High	500	Green	Permatex 64300, Weicon AN 302-38
5910	Silicone gasket	—	paste	Black	Permatex 81158 Black RTV — up to 300 °C
SF7649	Activator (cure)	—	spray	Amber	Permatex 82063 Anaerobic Activator
SF7800	Zinc primer	—	spray	Grey	Permatex 82073 Cold Galv Compound
MR5923	Aviation gasket	—	brush	Brown	Permatex Aviation Form-A-Gasket 3D — non-hardening

How to substitute

Match the function first (threadlock vs sealant vs gasket vs retainer). A retainer is not a threadlocker.
Match the strength class (low / medium / high / very high). Removal torque, not just assembly torque, drives which class the assembly can tolerate.
Match the viscosity. Thin (< 100 mPa·s) wicks into assembled threads; medium (1 000–5 000) is applied before assembly; thick (> 100 000) fills gaps or works as a formed-in-place gasket.
Check temperature. Standard grades rated to 150 °C, HT grades (272, 620) to 230 °C, silicone gaskets to 300 °C.
Check substrate. Inactive metals (stainless, zinc-plated, chromated) need an activator (7471 / SF7649) or the anaerobic cure will not initiate at ambient temperature.

Frequently asked questions

What is the difference between Loctite 242 and 243?: Both are medium-strength blue threadlockers; 243 is the newer surface-tolerant formulation that cures reliably on lightly oily fasteners and replaces 242 in most maintenance use.
What is an equivalent to Loctite 262?: High-strength red threadlocker equivalents include Permatex 27100 and Krylex KL62, as listed in the chart.
When is a red threadlocker used instead of blue?: Red (e.g. 262, 270, 271) is high strength for studs and fasteners not meant to be removed in service — disassembly needs heat (~250 °C); blue medium-strength grades hand-tool disassemble.
Are brand equivalents exact matches?: They match in strength class, colour convention and typical use, but cure speed, gap fill and oil tolerance differ by product — for a certified or safety-critical joint, qualify the specific adhesive.

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Compiled by cBallast for identification and cross-reference. Part numbers, designations and trademarks belong to their respective manufacturers. Confirm ratings and dimensions against the manufacturer's current documentation and the nameplate of the installed equipment before ordering or installation.