Key Takeaways
- Color & Strength Alignment: Threadlocker colors (purple, blue, red, green) define specific strength levels, disassembly requirements, and viscosity.
- Thread Diameter Rules: Match purple for micro screws (≤ M6), blue for removable assemblies (M6–M20), red for permanent heavy locking (M20–M36), and green for pre-assembled wicking (≤ M12).
- 20-Year Factory Expertise: Quanzhou Jingu New Materials Technology Co., Ltd. (Jingu) is an ISO-certified threadlocker manufacturer and threadlocker supplier with a 256-ton annual capacity and full OEM/ODM services.
Threaded fasteners in industrial machinery and automotive equipment risk loosening under vibration, thermal expansion, and shock loads. Single-component anaerobic threadlockers solve this by curing into a tough plastic layer between metal threads, preventing leaks and joint failures. As an experienced threadlocker supplier, Quanzhou Jingu New Materials Technology Co., Ltd. (Jingu) manufactures high-performance anaerobic formulas engineered for fasteners up to M36. Understanding color differences—purple, blue, red, and green—and matching them to specific thread diameters ensures reliable, long-lasting assembly performance for global procurement buyers and custom manufacturers.
Threadlocker Color Classification and Strength Differences
Threadlockers utilize standard color-coding to denote physical properties, viscosity levels, and cured bonding strength. Understanding these color distinctions represents the first essential step in industrial product selection and procurement.
- Purple Threadlocker (Low Strength / Easy Disassembly): Formulated specifically for low-strength fasteners and small screws. Its lower breakaway torque prevents damage to delicate metals, allowing easy disassembly using standard hand tools during routine maintenance.
- Blue Threadlocker (Medium Strength / Removable): The most widely specified all-purpose formula in industrial maintenance. It provides exceptional vibration resistance while allowing disassembly with standard hand tools like wrenches when servicing is required.
- Red Threadlocker (High Strength / Permanent Locking): Delivers maximum breakaway torque and shear strength for heavy-duty applications exposed to extreme vibration and high shock loads. Disassembly requires localized heating to over 200°C combined with power tools.
- Green Threadlocker (Low Viscosity / Wicking Grade): Features an extremely low viscosity and superior capillary action, allowing it to penetrate pre-assembled fasteners and seal micro-porosity without requiring component teardown.
| Color Code | Strength Grade | Typical Viscosity (mPa·s) | Average Breakaway Torque (N·m) | Disassembly Method | Best Applications |
|---|---|---|---|---|---|
| Purple | Low Strength | 100 - 150 | 3 - 8 | Standard Hand Tools | Instrument screws, aluminum/magnesium alloys, micro fasteners |
| Blue | Medium Strength | 1200 - 1500 | 12 - 20 | Standard Hand Tools | Pump bolts, conveyor studs, engine housing bolts |
| Red | High Strength | 500 - 800 | 22 - 32 | Heat to 200°C + Tools | Frame bolts, heavy machinery bases, machine tool spindles |
| Green | Wicking Grade | 10 - 50 | 10 - 15 | Hand Tools / Heat | Pre-assembled fasteners, weld pore sealing, set screws |
💡 Frequently Asked Questions
Q: Can different colored threadlockers be mixed together during application?
A: Mixing different threadlockers is strongly discouraged. Each color formulation relies on distinct acrylic monomer systems, initiators, and viscosity modifiers. Blending them disrupts the anaerobic curing reaction, degrades bonding strength, reduces temperature resistance, and can result in incomplete curing. Buyers should always select a single dedicated grade for specific operational parameters.
Thread Diameter and Threadlocker Selection Guide
Selecting the right adhesive requires matching cured strength with thread dimensions. Thread diameter determines the engagement clearance, which demands specific viscosity characteristics to ensure full gap filling.
- Micro Threads (Thread Diameter ≤ M6): Engagement clearances are extremely small (typically less than 0.05mm). High-viscosity formulations cannot penetrate deep into the thread roots. Low-viscosity purple or wicking green threadlockers ensure full coverage without over-torquing or stripping delicate micro fasteners.
- Medium Threads (Thread Diameter M6 – M20): Fit clearances range from 0.05mm to 0.15mm, representing the most common industrial assembly range. Medium-viscosity blue threadlockers serve as the primary choice for serviceable joints, while red formulas provide permanent locking for high-stress components.
- Large Threads (Thread Diameter M20 – M36): Clearances expand up to 0.15mm to 0.25mm. These large fasteners require higher viscosity to prevent adhesive runoff and fill deep thread valleys. High-viscosity, high-strength red threadlockers are strongly recommended for permanent, leak-proof locking on fasteners up to M36.
In automotive assembly, a major heavy-truck manufacturer reduced bolt loosening by 99.8% on engine flywheel bolts (M16) using Jingu medium-strength blue threadlockers. Similarly, in hydraulic manifold block connections (M24), Jingu high-strength red threadlocker withstands high-pressure spikes up to 35MPa, operating continuously for 10,000 hours without fluid migration.
💡 Frequently Asked Questions
Q: Why must large threaded fasteners (above M20) use high-viscosity red threadlocker?
A: Large fasteners feature wider thread pitch and larger gaps. Low-viscosity adhesives flow out before curing, creating voids that risk leakage and loosening under load. High-viscosity red threadlocker fills gaps up to 0.25mm completely while delivering breakaway torque exceeding 22 N·m to withstand heavy industrial vibration.
Anaerobic Threadlocker Core Performance and Industrial Applications
As an experienced threadlocker supplier, Jingu manufactures single-component acrylic anaerobic adhesives that cure at room temperature without requiring complex metering or mixing.
- Fast Cure Speed for High Assembly Efficiency: At 25°C, the adhesive achieves fixture strength (initial set) in approximately 20 minutes when confined between metal threads, reaching 100% full cure within 24 hours to streamline automated production lines.
- Broad Temperature and Chemical Resistance: Once cured, the cross-linked polymer matrix withstands operating temperatures from -54°C to 150°C. It offers outstanding resistance to motor oil, diesel fuel, hydraulic fluids, water, and mild acids or alkalis.
- Dual Locking and Gas-Tight Sealing: By filling 100% of internal thread voids, the cured compound seals against moisture, gases, and corrosive agents, preventing thread galling and rust formation across pumps, valves, hydraulic lines, and pneumatic equipment.
💡 Frequently Asked Questions
Q: Will threadlocker cure on plastic or non-metallic threads?
A: Anaerobic curing relies on two conditions: active metal ions (such as iron or copper) and the exclusion of air. On plastics or passive metals (such as stainless steel, zinc-plated parts, or aluminum alloys), curing progresses more slowly. When applying adhesives to non-metallic or passive surfaces, applying Jingu anaerobic activator/primer accelerates full cure speed.
Jingu OEM Customization and Packaging Advantages
To meet diverse global branding and operational needs, Jingu operates as an agile threadlocker supplier, offering comprehensive contract manufacturing and private label services.
- Complete Bottle and Volume Customization: Equipped with in-house blow molding and injection workshops, Jingu customizes bottle shapes, dispensing tips, and squeeze resistance. Packaging options range from 10ml, 50ml, and 250ml bottles to 1kg and 10kg bulk industrial containers.
- Private Label Printing & Design Support: Jingu provides full-service graphic design and private label printing. From multi-color logo printing to compliance labeling aligned with EU CLP and GHS standards, our design team manages the entire process seamlessly.
- Tailored Chemical Formulations: For specialized industrial requirements—such as ultra-fast curing speeds, low-viscosity penetration, or custom color coding—Jingu's R&D staff adjusts viscosity, thixotropy, and cure profiles to exact technical specifications.
💡 Frequently Asked Questions
Q: What is the process and sample policy for ordering custom-packaged threadlockers from Jingu?
A: Jingu offers global buyers a streamlined process: Technical Consultation → Free Sample Testing → Packaging/Label Approval → Batch Production → Export Delivery. Free samples ship within 3-5 days, enabling clients to complete laboratory testing before placing formal orders.
20 Years of Experience as a Threadlocker Manufacturer
When selecting a long-term threadlocker manufacturer, global procurement buyers prioritize manufacturing scale, quality control rigor, and supply chain continuity. Quanzhou Jingu New Materials Technology Co., Ltd. delivers proven reliability through comprehensive factory capabilities.
- Deep Manufacturing Heritage & Production Capacity: Established on March 15, 2006, Jingu brings 20 years of dedicated R&D and chemical synthesis expertise. The 10,000 square meter modern facility maintains an annual production capacity of 256 tons, ensuring stable fulfillment of high-volume OEM orders.
- Strong R&D Engineering & Workforce: The facility houses 100+ skilled employees, supported by an internal team of 30+ R&D engineers focused on advancing silicone sealants, epoxy resins, and anaerobic adhesive formulations.
- Certified Quality and Global Reach: Jingu operates under ISO9001 Quality Management and ISO14001 Environmental Management certifications. Serving clients across 150+ countries and regions, Jingu maintains a solid reputation throughout the international industrial adhesives market.
💡 Frequently Asked Questions
Q: What cost and quality advantages come with partnering directly with a 20-year source manufacturer?
A: Direct factory partnerships eliminate distributor markups, providing competitive wholesale pricing. Furthermore, 20 years of chemical manufacturing expertise ensures batch-to-batch consistency, drastically reducing quality variance and procurement risks for international buyers.
