Retaining Compounds FAQ

Q: How do you calculate bonded slip fits and press or shrink fits augmented with adhesive bonding?

Henkel has developed an extensive library of data on the adhesive performance of retaining compounds. This data has been consolidated to provide predictive tools that can be used to estimate the load capacity of bonded slip fit and press or shrink-fit joints augmented with adhesive bonding.

These calculations can be performed by trained Henkel staff using our proprietary RetCalc+ software, created specifically for retaining applications.

For a detailed explanation of the calculations we use, view or download the attached document.

Calculation of Bonded Slip Fits and Press or Shrink Fits Augmented with Adhesive Bonding

Q: How do you fit a gear to a clutch plate?

This assembly is made in two parts in order to permit cutting of the gear teeth. The original design required positioning three dowels equally spaced on the joint between the two contacting surfaces to transmit the torque, since the wall thickness was too small to accommodate a keyway. The gear wheel has helicoidal teeth, and is subjected to different tangential and axial loads, depending on the direction of rotation, but the torque load never exceeds 18 N.m (159 in.-lb.). As torque transmission was the driving design factor, calculations only concern this load.

For more detailed information, view or download the attached Gear Fit document.

Fitting a Gear to a Clutch Plate

Q: What are the factors to consider in joint design?

For a detailed look at the factors to consider in joint design, view or download the attached Joint Design document.

Joint Design

Q: How do you fit bearings?

The performance provided by LOCTITE® Retaining Compounds makes them particularly suitable for fitting bearings. LOCTITE® Retaining Compounds have very high compression strength, and prevent fretting corrosion. Retaining compounds are available in removable strengths for easier assembly.

  • Locking rings and circlips can be removed, eliminating costly shaft grooving and difficult assembly.
  • Stepped diameters can be reduced by eliminating the need for shoulders to locate bearings.
  • Improved bearing alignment can be achieved by compensating for surface imperfections.
  • The assembly is sealed against the environment, eliminating fretting and galvanic corrosion.
  • Assembly can be simplified by the easing of tolerances.

Q: How do you assemble wear parts, self-lubricating bushings and inserts?

Wear rings, liners, shrink rings (of any thickness), tubular connectors, inserts, plugs and self-lubricating sintered bushings can be assembled using retaining compounds such as LOCTITE® 638™ or LOCTITE® 648™. Choice of retaining compound will depend upon operating conditions and whether the assembly must be dismantled.

In many cases — engine cylinder liners, pump, drill and bronze bushings — a press is used to fit bushings, a procedure that requires additional machining due to the elastic deformation of the parts. In addition to increasing costs, if too much rework is done, there is a risk of weakening the quality of the fit. Also, by reducing wall thickness, stress and the risk of potential assembly failure is increased. These problems can be eliminated by assembling bushings and liners using a bonded slip-fit.

Q: How do you fit non-metallic parts?

Many parts made from molded materials are now used in assemblies for various reasons: cost reduction, appearance, improved resistance to wear or to achieve increased flexibility. Examples include: handles, hand-wheels, control buttons, nylon rings and bushings, gears and friction washers. LOCTITE® Retaining Compounds can be used to assemble these items to metal parts or to strengthen assemblies which are often weak due to their flexibility or fragility. LOCTITE® Retaining Compounds can also be used where it may be difficult to obtain a sufficiently accurate fit.

LOCTITE® Retaining Compounds cure in the absence of air and by the catalytic effect of the metal. To improve cure time with non-metallic parts, LOCTITE® Activator may be used to treat the surfaces before applying the adhesive. Plastic components need to be tested to ensure retaining compound or activator does not stress crack the component.

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