Henkel Loctiter 648 High Temp Oil-Tolerant Anaerobic Retaining Compound for Cylindrical Fitting of Gears Sprockets & Motor Rotors
Loctiter 648™ is a one-component, low-viscosity, high-strength anaerobic-curing retaining compound based on urethane methacrylate. It appears as a green fluorescent liquid uncured and cures in the absence of air between close-fitting metal surfaces.
| Property | Value / Description |
|---|---|
| Technology | Acrylic, Urethane Methacrylate |
| Appearance (Uncured) | Green Liquid, Positive Fluorescence under UV |
| Components | One Component – No Mixing Required |
| Cure Mechanism | Anaerobic (Cures in absence of air, in presence of metal ions) |
| Viscosity, Brookfield-RVT @ 25°C | 400 – 600 mPa·s (cP), Spindle 2, 20 rpm (Typical 500 cP) |
| Specific Gravity @ 25°C | 1.1 |
| Gap Fill (Maximum) | 0.15 mm |
| Fixture / Handling Time (Steel, 22°C) | ~3 – 10 min (Typical ~3 min) |
| Full Cure Time @ 22°C | 24 h |
| Compressive Shear Strength, ISO 10123 (Steel, 24 h) | ≥25 N/mm² (≥ 3,625 psi); (7 d: ~31 N/mm²) |
| Compressive Shear Strength (Stainless Steel, 7 d) | ~30 N/mm² |
| Service Temperature Range | -55 °C to +180 °C (-65 °F to +355 °F) |
| Oil Tolerance | Yes – tolerates minor contamination from cutting & lubrication oils |
| Fluorescent for Inspection | Yes (under UV light) |
| Shelf Life (unopened, 8–21°C) | 24 Months |
| Recommended Activator (if needed) | LOCTITER 7471™ or 7649™ |
| Agency Approvals | NSF P1 Registered; DVGW; WRAS (where listed) |
Loctiter 648™ is designed for bonding cylindrical fitting parts such as shafts with gears, bearings or bushings, filling gaps up to ~0.15 mm and preventing loosening or leakage from shock and vibration. It cures on both active metals (mild steel) and passive substrates (stainless steel, plated surfaces), offers high-temperature resistance and tolerates minor oil contamination (cutting/lubrication fluids). It fluoresces under UV light for quality control inspection.
This is a high-strength grade; compressive shear strength on steel pins/collars ≥25 N/mm² after 24 h cure. Service temperature range is -55 °C to +180 °C. Maximum gap fill: 0.15 mm. Positive fluorescence under UV light enables in-line QC. It is a non-corrosive anaerobic system that tolerates minor surface oil contamination, reducing pre-cleaning needs—fixture time ~3–10 min on steel, full cure in 24 h.
Typical uses: securing gears & sprockets onto gearbox shafts, fixing rotors to electric motor shafts; retaining bearings, bushings or sleeves into housings; coupling/pulley retention; restoring worn interference fits. Commonly specified in automotive powertrain, industrial gearboxes, electric motors and pumps requiring high-strength, vibration-resistant cylindrical bonding.
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