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LOCTITE® · SKU 640

LOCTITE® 640 retaining compound

Slow-curing green retainer that allows a long assembly time.

Retaining compounds

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Pack sizes
50 ml · 250 ml · 1 L
Temperature range
−54 to 175 °C
Country of origin
China
Viscosity
600 mPa·s
Curing time
Fixture about 1 h; full cure 24 h

Typical uses

  • Press fits that take time to align
  • Medium-strength cylindrical bonds

Green retaining compound with a slow cure for long assembly time. Gap about 0.004 in. (0.1 mm). Shear about 3,200 psi. Service to 175 °C. Primers SF 7471 or SF 7649. Sourcebook lists MIL-R-46082B and ASTM D-5363. The agency index describes it as a press-fit, medium-strength, high-temperature grade. Figures follow the LOCTITE Adhesive Sourcebook 2024. Confirm the current TDS before sign-off.

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Technical specifications

ColourGreen
CureSlow, long assembly time
GapAbout 0.004 in. (0.1 mm)
Country of originChina
Recommended PrimerLOCTITE® SF 7471 or LOCTITE® SF 7649

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