Direct replacements and closest alternatives for common automotive and industrial applications.
How to Use This Cross Reference
This cross reference is designed to help buyers, technicians, and maintenance professionals identify Permatex products that are commonly used in place of specific Loctite formulations, as well as the closest alternatives when a true one-to-one replacement does not exist.
Products are categorized by function and performance class. Each entry is labeled as either a direct functional replacement or a closest alternative, with notes explaining important differences where applicable.
This guide reflects real-world substitution practices, but it is not a substitute for verifying temperature ratings, oil exposure, gap limits, and OEM requirements for critical applications.
Important Substitution Notes
- Direct replacement means the products share the same intended application and performance class under typical conditions.
- Closest alternative means the product is commonly used for the same purpose, but may differ in secondary characteristics such as oil tolerance, temperature rating, or cure behavior.
- For safety-critical, OEM-specified, or high-temperature assemblies, always verify the technical data sheet before substituting.
Loctite to Permatex Cross Reference Table
The table below lists common Loctite product families alongside the Permatex products most often selected as replacements or alternatives.
| Category | Loctite Product | Permatex Product | Match Type | Notes |
|---|---|---|---|---|
| Threadlocker – Medium Strength | Loctite 242 Threadlocker Blue | Permatex Medium Strength Threadlocker Blue (24200 series) | Direct functional replacement | Standard removable threadlocker; oil-tolerant versions should not be substituted blindly. |
| Threadlocker – Medium Strength (Oil Tolerant) | Loctite 243 Threadlocker Blue | Permatex Surface Insensitive Threadlocker Blue (24027) | Closest alternative | Designed for slightly oily fasteners and passive metals. |
| Threadlocker – High Strength | Loctite 271 Threadlocker Red | Permatex High Strength Threadlocker Red (27100 series) | Direct functional replacement | Heat may be required for disassembly. |
| Threadlocker – Wicking | Loctite 290 Threadlocker Green | Permatex Penetrating Grade Threadlocker Green (29000) | Direct functional replacement | Designed to wick into pre-assembled fasteners. |
| Anaerobic Gasket Maker | Loctite 518 Flange Sealant | Permatex Anaerobic Gasket Maker (51813 series) | Direct functional replacement | Rigid metal flanges with close surface finish. |
| RTV – Grey | Loctite 5699 Grey RTV | Permatex Ultra Grey RTV | Direct functional replacement | High-torque, rigid flange assemblies. |
| RTV – Black | Loctite Black RTV | Permatex Ultra Black RTV | Closest alternative | Oil resistance comparable; verify sensor compatibility. |
| Thread Sealant – Hydraulic | Loctite 545 Thread Sealant | Permatex Hydraulic / Pneumatic Sealant (54540) | Direct functional replacement | Fine-thread hydraulic and pneumatic fittings. |
| Anti-Seize – Copper | Loctite Copper Anti-Seize | Permatex Copper Anti-Seize | Direct functional replacement | High-temperature fasteners and exhaust hardware. |
This table represents a subset of the full cross-reference. Additional product families and industrial grades are added as new catalog data becomes available.
Related Guide
For a deeper explanation of why these products are often interchangeable, and where substitution can fail, see our companion article:
Loctite vs. Permatex: Why Many Products Are Interchangeable — and When They Aren’t
Need Help Choosing?
If you’re working with high temperatures, oil-contaminated fasteners, or safety-critical assemblies, and you’re unsure whether a substitution is appropriate, contact Bulk55 with your application details.