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0.5ml
Overview

LOCTITE® 638 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps can approach 0.25 mm. Ideal for use where high dynamic forces or cyclic loading is expected, for eg: shafts, gears, pulleys and cylindrical parts that

  • High Strength (4200 Psi)
  • Fills Gaps Upto 0.25mm
  • 180oC Service Temperature
  • High temperature resistance
  • High strength on all metals, including passive substrates (e.g. stainless steel)
Size

*The minimum order quantity for this size should not be less than 10 items.

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MRP Rs. 15.00/-
Discounted Price Rs. 7.50/-
Introductory offer on first order
  • 1-5 qty 50% off
    upto INR 1500
  • 6-10 qty 33% off
    upto INR 2500
  • 11-25 qty 25% off
    upto INR 4000
  • > 25 qty 10% off
Final discount applicable will be based on the total quantity in your cart

Features and benefits

  • Prevents loosening: It fills all gaps between the cylindrical components and cures into a hard thermoset plastic. This unitizes the assembly and prevents loosening and leakage from shock and vibration
  • Works on all metal substrates
  • Tolerant towards minor surface contaminations

Specifications

Tech specifications
Gap Fill Up to 0.25mm
Shear Strength (N/mm2) 4200 psi (29)
Temperature Resistance (Continuous) 180oC
Cure Time (Setup/Full Strength) 15 min/24 hour

Technical Documents

How To Videos

Step-by-step application

FAQs

  What is the optimum fit for using anaerobic retaining compounds if I want to maximize the shear strength?

The optimum fit for thinner products (low viscosity) like LOCTITE 603 and LOCTITE 609 is 0.025 mm to 0.08 mm, and for thicker products (high viscosity) like LOCTITE 638 and LOCTITE 648 it is 0.05 mm to 0.1 mm.

  What is the recommended surface roughness for cylindrical components being fitted with LOCTITE retaining compounds?

The recommended range for surface roughness of the cylindrical parts is 0.8 micron to 3.2 micron. You can also go for surface roughness as high as 50 micron if eccentricity is not a concern.

  What is the correct procedure for applying LOCTITE retaining compounds?

For slip fit assemblies, apply to only one of the parts and assemble with a twisting/turning motion. For tight/close fitting assemblies with minimum clearance, apply to both parts.

  We need to lock bearings in place but there will be exposure to oils. Will LOCTITE retaining compound also seal the joint?

Yes, all LOCTITE retaining compounds offer the dual benefit of lock and seal.

  Can LOCTITE retaining compounds migrate to and jam other parts?

No. LOCTITE retaining compounds are thixotropic in nature, which means that they are quite viscous unless a shear force is applied. Hence, LOCTITE retaining compounds will not flow to other areas of the machinery.

  Do I need to use a Primer with a LOCTITE retaining compound?

We recommend the use of primer where both the parts come under the category of 'inactive surfaces'. These metals lack the iron or copper content and thus the metallic ions that are required to fully cure the product within 24 hours. These inactive surfaces include plated parts, stainless steel, galvanized steel and anodized aluminium to name a few. On the other hand, in case both or at least one part is an active metal, then there is no need to use a primer to ensure full cure, which is typically within 24 hours at room temperature.

  How can a cylindrical assembly fitted with LOCTITE retaining compound be disassembled?

To disassemble an assembly fitted with LOCTITE retaining compound, just pull the assembly apart mechanically. If necessary, apply localize heat (230 degrees celsius for 5 mins) and pull while the assembly is hot.

  We need to retain a worn shaft and also lock it into a housing or bearing. Are there any solutions for this?

Yes. With LOCTITE 660 retaining compound, shafts with radial gaps less than 0.5 mm can be locked. In case of badly worn shaft, the repair can be done with LOCTITE Superior Metal.

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