Retaining

About Retaining

Retaining compounds are specialised anaerobic adhesives engineered to secure cylindrical assemblies by filling microscopic gaps between mating metal surfaces. These high-performance chemical solutions provide a robust alternative to traditional mechanical methods like pins, keys, and press fits, creating vibration-resistant bonds that prevent loosening, leakage, and corrosion in mechanical assemblies. MyToolShed.co.uk stocks professional-grade retaining compounds from trusted brands including Bondloc and Sealey, designed for demanding workshop and industrial applications.

Available in various strength grades, these anaerobic adhesives cure in the absence of air when confined between close-fitting metal surfaces, transforming from liquid into a tough thermoset plastic that withstands extreme temperatures, vibration, and chemical exposure. Whether securing bearings and bushings or locking gears and pulleys onto shafts, retaining compounds eliminate the need for expensive machining tolerances whilst increasing load-bearing capacity. MyToolShed offers both standard and specialised formulations, including oil-tolerant variants for maintenance applications where thorough degreasing isn't practical.

Applications

Retaining compounds are essential across numerous trades and industries:

• Mechanical Engineers - machinery assembly, refurbishment, and maintenance work
• Automotive Technicians - securing bearings, bushings, and transmission components
• Plant Maintenance Fitters - repairing worn assemblies on production equipment
• Hydraulic Engineers - sealing and securing hydraulic pump and motor components
• Agricultural Mechanics - repairing farm machinery with worn tolerances
• Marine Engineers - maintaining marine engines and propulsion systems
• General Engineering Workshops - fabrication and repair projects
• Manufacturing Facilities - production line assembly and quality assurance

Choosing The Right Retaining

Strength Requirements: High-strength formulations like Bondloc B638 create permanent bonds ideal for static assemblies, whilst medium-strength variants allow for disassembly with heating when future maintenance is anticipated.

Surface Condition: Standard retaining compounds require clean, degreased surfaces for optimal performance. For surfaces with oil residue, opt for oil-tolerant formulations like Bondloc B603 that cure despite light contamination.

Gap Size: Bearing fit retainers such as Bondloc B641 and the Sealey High Strength Bearing Fit Retainer handle larger clearances up to 0.38mm, whilst general retaining compounds work best in gaps under 0.25mm. Measure your clearance carefully to ensure effective bonding.

Temperature Exposure: Most professional retaining compounds withstand continuous temperatures between -55°C and +150°C, but verify the operating range matches your application requirements.

Cure Time: Fixture times vary from 5 to 30 minutes, with full cure strength typically achieved within 24 hours at room temperature. Consider heat-accelerated curing for faster production schedules.

Safety Information

Always wear appropriate PPE including nitrile gloves and safety glasses when handling uncured compounds. Work in well-ventilated areas to minimise inhalation exposure to vapours. Consult the product Safety Data Sheet (SDS) before use and ensure your COSHH risk assessment covers anaerobic adhesive hazards. If retaining compound contacts skin, wash immediately with soap and water—never use solvents on skin. These adhesives bond skin rapidly, so exercise particular care during application. Store in a cool, dry place away from heat sources.

Frequently Asked Questions

Can retaining compounds be used on worn or oversized bearings?
Yes, bearing fit retaining compounds are specifically formulated to fill larger gaps up to 0.38mm, making them ideal for salvaging worn assemblies that would otherwise require expensive machining or component replacement. This makes them particularly valuable in maintenance situations where tolerances have deteriorated through wear.

How do I remove a component secured with retaining compound?
Disassembly methods depend on compound strength. Medium-strength retainers typically release when heated to approximately 250°C using a heat gun. High-strength permanent formulations may require more aggressive heating or mechanical methods. Always consult the product technical data sheet for specific removal procedures.

What's the difference between retaining compound and threadlocker?
Whilst both are anaerobic adhesives, retaining compounds are formulated for cylindrical assemblies and can fill larger gaps up to 0.5mm, making them suitable for bearing fits and bush installations. Threadlockers are optimised for threaded fasteners with different strength requirements and gap characteristics.