LOCTITE 675 is a one-part, anaerobic retaining adhesive formulated for bonding cylindrical fitting parts (such as bearings, bushes, shells, shafts) where tight tolerances and close metal-to-metal fits exist. Its very low viscosity allows flow into narrow gaps and keyways, while its slow fixture time (~45 min on steel) gives ample positioning time for complex assembly. Once cured in the absence of air between close-fitting metal surfaces, it creates a durable bond that resists vibration, shock and leakage. It supports diametrical clearances up to approximately 0.10 mm (0.004″) and operates in service temperature ranges from –55 °C to +150 °C.
This product meets military specification MIL-R-46082 Type I, enhancing its suitability for demanding industrial and aerospace assemblies.
Key Features & Benefits
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Very low viscosity — penetrates tight fits and keyways effectively.
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Slow-cure fixture time (~45 min) — allows alignment and adjustment in larger or complex assemblies.
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High shear strength (~20 N/mm² on steel) — provides robust retention in precision assemblies.
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Tight gap capability (<0.10 mm) — optimized for close-fitting cylindrical parts.
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Wide temperature resistance (–55 °C to +150 °C) — suitable for industrial environments and thermal cycling.
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One-component anaerobic system — no mixing required, cures between metal surfaces.
How to Use
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Surface Preparation
Ensure all mating metal surfaces are clean, free of heavy oil, coatings, corrosion and old adhesives. Degrease if necessary. -
Application
Apply LOCTITE 675 to the cylindrical surface (shaft or bore) or around keyways/splines. For slip-fit assemblies, coat the leading edge and rotate during assembly to distribute evenly. For press fits, apply adhesive to one surface and assemble immediately. -
Assembly & Alignment
Because of the slow cure, you have extended time for adjustment. Ensure parts remain in contact and confined until cure begins. -
Curing / Handling
Initial handling strength is reached after approximately 45 minutes (steel) under optimal conditions. Full cure occurs over 24 hours. Avoid loading or movement until initial handling strength is achieved. -
Disassembly / Repair
For bonded parts requiring removal, apply localized heat and/or mechanical force. Use appropriate solvents to assist removal if required, following safety data sheet instructions.
FAQs
Q1: Can LOCTITE 675 be used on larger clearance fits?
A1: It is optimized for very tight clearances (~0.10 mm). For larger gaps, a different grade with higher gap-fill should be considered.
Q2: What is the benefit of the slow cure time?
A2: The extended fixture time (~45 minutes) allows better maneuvering, alignment and positioning of parts before bonding sets.
Q3: Does it require a primer for passive metals?
A3: Generally, no primer is required for common metal assemblies. Refer to the TDS for specific passive metal conditions.
Q4: What is its MIL specification?
A4: LOCTITE 675 meets MIL-R-46082B Type I.
