LOCTITE® 638 High Strength Retaining Compound
Features and Benefits
- Ideal for shafts, gears, pulleys and similar cylindrical parts
- High strength on all metals, including passive substrates (e.g. stainless steel)
- High temperature resistance
- UV fluorescent for inspection
Documents and Downloads
- 250 ml Bottle 10.0/case - IDH 1835925
- 50 ml Bottle 10.0/case - IDH 1835936
- 10 ml Bottle 10.0/case - IDH 1835937
Size Case: 250 ml Bottle
Size Case: 50 ml Bottle
Size Case: 10 ml Bottle
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|Agency approvals / certificates / specifications||DVGW (EN 751-1): NG-5146AR0619, NSF P1 Reg No: 123010, WRAS (BS 6920): 0511518|
|Application method||Dispense System, Manual|
|Applications||For Close Fitting Cylindrical Parts, For Slip Fitted Parts, Retaining|
|Cure type||Anaerobic Cure|
|Fixture time||4.0 min.|
|Gap fill||0.15 - 0.25 mm|
|Key characteristics||Fluorescent, Oil Tolerant, Strength: High Strength, Temperature Resistant, Viscosity: High Viscosity|
|Operating temperature||-55.0 - 180.0 °C (-65.0 - 355.0 °F )|
|Recommended for use with||Metal: Steel|
|Shear strength, Steel||31.0 N/mm² (4500.0 psi )|
|Viscosity||2500.0 mPa·s (cP)|
Step by Step Guide
1. Preparation - Cleaning
Use LOCTITE® SF 790™ to remove any old adhesive from parts. Use LOCTITE® SF 7070™ to degrease and clean surfaces prior to applying adhesive. For gaps larger than 0.5mm or worn out shafts, bearing seats or keyways, use LOCTITE® metal-filled compounds to rebuild the surfaces.
2. Preparation - Activation
If cure speed is too slow due to passive metals (stainless steel, aluminum and plated metals) or low temperature (below 5°C), use LOCTITE® SF 7649™ activator. Allow to dry.
3a. Application - For Slip-Fitted Assemblies
Apply adhesive around the leading edge of the male component and the inside of the female component. Assemble parts with a rotating motion to ensure good coverage. Wipe off excess adhesive.
3b. Application - For Press-Fitted Assemblies
Apply 360 degree beads of adhesive to both bond surfaces at the leading edges of insertion or engagement, and assemble at high press-on rates. Wipe off excess adhesive.
3c. Application - For Shrink-Fitted Assemblies
Apply the adhesive onto the male component; heat the female component to cause expansion for free assembly. Assemble components and allow temperatures to equilibrate. Wipe of excess adhesive.
Apply localized heat to approximately 500°F/260°C; disassemble while hot. For corroded or seized parts, use LOCTITE® 8040™ Freeze and Release.
For manual assembly of adhesive the use of LOCTITE® Pro Pump or LOCTITE® Peristaltic Hand Pump is recommended to ensure a conistent application volume. For semi-automatic or fully-automated dispensing options contact our technical service team for advice.
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