Permabond HM161 Retaining Compound

Description

Permabond® HM161 is a high-strength anaerobic retaining compound formulated to secure bearings, shafts, bushings, and other cylindrical assemblies. This one-part liquid adhesive cures when confined between metal surfaces in the absence of oxygen, forming a durable, impact-resistant polymer that prevents loosening, wear, and fretting corrosion.

This military-grade adhesive meets MIL-SPEC MIL-R-46082B Type III and ASTM D5363 (Group 04, Class 2, Grade 1), making it an ideal choice for military, aerospace, automotive, and industrial applications.

For customers seeking alternatives to Loctite® 648, 3M™ Scotch-Weld™ RT38, or Permatex® High-Strength Retaining Compound, Permabond HM161 provides a premium, high-performance solution.

Key Features & Benefits

✅ High-Strength, Permanent Retention – Locks cylindrical components in place, preventing movement
✅ MIL-SPEC Compliant – Meets MIL-R-46082B Type III and ASTM D5363 (Group 04, Class 2, Grade 1)
✅ Fills Gaps & Enhances Joint Strength – Reduces the need for tight press fits
✅ Fast Curing at Room Temperature – Handling strength in 10 minutes, full cure in 24 hours
✅ Prevents Corrosion & Moisture Ingress – Seals joints from environmental exposure
✅ Increases Component Longevity – Reduces stress and wear in rotating assemblies
✅ 100% Solids, Solvent-Free – Environmentally friendly and safe for industrial use

Technical Specifications

• Viscosity: 2,000 mPa.s (thixotropic, medium viscosity)
• Gap Fill: 0.25 mm (0.01 in)
• Maximum Thread Size: M30 (1¼”)
• Handling Strength: ~10 minutes at 23°C (73°F)
• Full Cure Time: 24 hours
• Torque Strength (M10 Steel, ISO 10964):
  • Break: 31 N·m (275 in.lb)
  • Prevail: 45 N·m (400 in.lb)
• Shear Strength (Steel Collar & Pin, ISO 10123): 24 MPa (3500 psi)
• Temperature Range: -55°C to 150°C (-65°F to 300°F)
• Color: Green

Applications

• Securing cylindrical components in slip, press, or shrink fit assemblies
• Retaining bearings, bushings, shafts, and gears in rotating machinery
• Preventing fretting and loosening in high-load mechanical systems
• Enhancing clearance fit assemblies by increasing push-out force
• Military, aerospace, automotive, and heavy equipment applications

Directions for Use

1. Ensure surfaces are clean, dry, and grease-free. Use acetone or isopropanol for best results.
2. For slip fit assemblies, apply HM161 to the leading edge of the pin and inside the collar.
3. For press fit assemblies, apply HM161 to both components before pressing them together.
4. For shrink fit assemblies, heat the collar, apply HM161 to the pin, and assemble while components are expanded.
5. Allow 10 minutes for handling strength and 24 hours for full cure.
6. For faster curing, use Permabond A905 or ASC10 Activator.

🔹 Note: HM161 is a high-strength, permanent retaining compound—removal may require localized heating and mechanical force. Not recommended for plastic components or oxygen-rich systems.