Loctite 680 retaining compound – 50 ml

The Loctite 680 retaining compound is a high-performance anaerobic adhesive formulated to bond cylindrical metal assemblies with zero clearance. This green, high-strength compound fills the microscopic gaps between press-fit parts, eliminating movement, fretting, and wear in critical components. Ideal for applications where high load transmission and vibration resistance are required.

Packaged in a convenient 50 ml bottle, it offers precision application for both repair and production environments.

⚙️ Technical Specifications

• Brand: LOCTITE

• Model: 680

• Size: 50 ml

• Color: Green

• Type: Retaining compound (anaerobic)

• Strength: High

• Viscosity: Medium (150 – 300 mPa·s)

• Cure Time (Fixture): ~10 minutes on steel

• Full Cure Time: 24 hours

• Temperature Resistance: -65°F to 300°F (-55°C to 150°C)

• Recommended Gap: Up to 0.015″ (0.38 mm)

🧰 Common Applications

• Press-fit shafts and housings

• Bearings, bushings, and sleeves

• Cylindrical parts in motors and gearboxes

• Retaining rotors on shafts

• Bonding pulleys, gears, and spindles

• Mechanical assemblies under vibration or torque

The Loctite 680 retaining compound ensures reliable long-term retention in high-stress, high-speed applications.

💡 Key Benefits

• High-strength bonding for cylindrical components

• Zero-movement: Prevents loosening, backlash, and micro-movement

• Oil-tolerant: Cures even on slightly contaminated surfaces

• Fast fixture time: Minimizes production delays

• Seals against corrosion and leakage

• Temperature and chemical resistant for tough conditions

🛠 How to Use Loctite 680

1. Clean and degrease surfaces thoroughly using Loctite SF 7063 or SF 7070.

2. Apply a continuous bead of Loctite 680 retaining compound around the shaft or inside the housing.

3. Assemble parts with a rotating motion.

4. Fixture time is ~10 minutes; full strength achieved in 24 hours.

5. For disassembly, apply heat (>250°C) and use mechanical force.

Tip: For even faster curing, use with Loctite SF 7471 or SF 7649 activators on inactive metals.

🔍 Compatibility & Substrates

• Compatible with steel, aluminum, stainless steel, brass, and other metals

• Performs well even on oily or unprepared surfaces

• Best suited for close-fitting cylindrical parts with minimal clearance

🏆 Why Choose Loctite?

Trusted by professionals worldwide, LOCTITE retaining compounds are used in OEM, maintenance, and repair operations across industries. The Loctite 680 is a proven solution for press-fit assemblies and components that must not fail—keeping machinery efficient, precise, and durable.