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.
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 |