High Strength Retaining Compound
LOCTITE 638
Product category: Retaining Compounds
Data sheets
Technical
(1)
Product information
- Description
- Technical specifications
LOCTITE® 638 is designed for the bonding of cylindrical fitting parts, particularly with narrow bond gaps approaching 0.25 mm. The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration. It not only works on active metals but also on passive substrates, exhibiting robust cure performance. The product offers high-temperature performance and good oil tolerance, and tolerates minor surface contaminants.
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Tolerates minor contaminants, including industrial oils
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High strength on all metals, including passive substrates (e.g. stainless steel)
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High temperature resistance
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Ideal for shafts, gears, pulleys and similar cylindrical parts
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DVGW Approval (EN 751-1): NG-5146AR0619
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P1 NSF Reg. No.: 123010
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WRAS Approval (BS 6920): 0511518
Agency Approvals / Specifications:
DVGW (EN 751-1): NG-5146AR0619,NSF P1 Reg No: 123010,WRAS (BS 6920): 0511518
Color:
Green
Gap Fill:
0.15 mm - 0.25 mm
Substrates:
Metal: Steel
Fixture Time:
4.0 min.
Viscosity:
2500.0 mPa·s (cP)
Shear Strength, Steel:
31.0 N/mm² (4500.0 psi)
Operating Temperature:
-55.0 °C - 180.0 °C (-65.0 °F - 355.0 °F)
Key Characteristics:
Fluorescent,Oil Tolerant,Strength: High Strength,Temperature Resistant,Viscosity: High Viscosity
Technology:
Acrylic
Applications:
For Close Fitting Cylindrical Parts,For Slip Fitted Parts,Retaining
Application Method:
Dispense System,Manual
Physical Form:
Liquid
Cure Type:
Anaerobic Cure
How to use
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.
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.
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.
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.
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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