21601 Medium Strength Threadlocker, 6 Ml Tube, Blue

Permatex 21601 is a medium-strength threadlocker designed to secure nuts and bolts in automotive, machinery, and general fastening applications. This all-purpose formula locks and seals threaded fasteners while preventing parts from loosening due to vibration, heat, and movement. It works on fastener sizes from 1/4 to 3/4 inch (6 to 20 mm), eliminating the need for expensive locknuts and lock washers on most jobs.

The blue liquid formula also protects threads from corrosion and oxidation, extending the life of your fasteners in harsh environments. Because it remains removable with standard hand tools, you can disassemble parts for maintenance or repairs without damaging the bolt or threaded hole—ideal for work you may need to undo later. The 6 mL tube includes a precision applicator tip for controlled, accurate application with minimal waste.

Features and Benefits

• Medium-strength formula: Locks fasteners securely while remaining removable with hand tools, balancing permanence with serviceability.
• Vibration and corrosion protection: Prevents loosening under extreme conditions and shields metal threads from rust and oxidation.
• Precision applicator tip: Enables accurate dosing on small fasteners, minimizing product waste and mess.
• Universal fastener fit: Works on nut and bolt applications from 1/4 to 3/4 inch diameter.
• Compact 6 mL size: Ideal for tool kits, repair bags, and workstations with limited storage space.

Specifications

• Brand: Permatex
• Model: 21601
• Size: 6 mL tube
• Color: Blue
• Strength: Medium
• Application range: 1/4 to 3/4 inch (6 to 20 mm) fasteners
• Removable: Yes, with hand tools