Loctite 648 High Strength Retaining Compound 50ml

Loctite 648 is a one-component, green, high strength anaerobic retaining compound. It is a urethane methacrylate with low viscosity, designed for cylindrical fitting parts where bond gaps can approach 0.15 mm and maximum strength at room temperature is required.

Henkel describes it as offering high temperature performance and oil tolerance. It tolerates minor surface contamination from cutting, lubrication, anti-corrosion and protection fluids, and it works on active metals and on passive surfaces such as stainless steel and plated parts.

Where this product is used

• Locking bushings and sleeves into housings and onto shafts
• Cylindrical fitting parts where bond gaps can approach 0.15 mm
• Stainless steel and plated parts, which are passive surfaces
• Parts with minor oil contamination from cutting or lubrication fluids

Features

• High strength: 31 N/mm² on steel pins and collars after 72 hours at 23 °C
• Low viscosity class, one component, no mixing
• Green liquid with positive fluorescence under UV light
• Tolerates minor contamination from cutting, lubrication and anti-corrosion fluids
• Cures on active metals and on passive substrates
• Cold strength tested to -75 °C
• Activator speeds cure where needed

Key specifications

Selecting the right option

For a medium strength retaining compound that can be taken apart for service, see Loctite 641 Retaining Compound. Loctite 680 High Strength Retaining Compound 50ml is the other high strength grade in the range, and Loctite 660 Quick Metal High Strength Retaining Compound is a high strength retaining paste.

For slow cure on inactive surfaces, see Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g and Loctite SF 7649 Activator for Anaerobic Adhesives 133ml.

Using it

Steel reaches a minimum of 13.5 N/mm² after 15 minutes at 23 °C. The 31, 30 and 18 N/mm² shear figures and the torque figures are for 72 hours at 23 °C.

Henkel's cure-speed activator graph covers Activator SF 7471, SF 7649 and SF 7091. Use an activator where cure is slow.

To disassemble, apply localised heat to the assembly to approximately 250 °C and take the parts apart while hot.

Storage and handling

Store unopened in a dry location, optimally between 8 °C and 21 °C. Storage below 8 °C or above 28 °C can adversely affect the properties of the product.

Limits and safety

Not recommended for pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidising materials. Check compatibility with plastics, as stress cracking can occur, and with aqueous washing systems. Read the safety data sheet before use.

Frequently asked questions

How strong is Loctite 648?

On steel pins and collars it reaches 31 N/mm² after 72 hours at 23 °C (ISO 10123). Stainless steel reaches 30 N/mm² and aluminium 18 N/mm².

What torque does Loctite 648 hold on M10 bolts?

Breakaway 58 N·m and prevail 40 N·m on M10 black oxide bolts and mild steel nuts after 72 hours at 23 °C (ISO 10964).

How do I take apart parts retained with Loctite 648?

Apply localised heat to the assembly to approximately 250 °C and disassemble while hot.

What temperature can Loctite 648 handle?

The Henkel data sheet states no operating range. Cold strength was tested to -75 °C, and hot-strength data is shown as a graph in the data sheet.

How fast does Loctite 648 cure?

Henkel gives no fixture time. Steel pins and collars reach a minimum of 13.5 N/mm² after 15 minutes at 23 °C, and cure speed depends on the materials, the gap and the temperature.

Does Loctite 648 have DVGW, WRAS or NSF approvals?

The current Henkel data sheet lists no approvals; contact AIMS if you need a certificate for a specific application.

Related products

See also: Loctite 641 Retaining Compound, Loctite 680 High Strength Retaining Compound 50ml, Loctite 660 Quick Metal High Strength Retaining Compound, Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g, Loctite SF 7649 Activator for Anaerobic Adhesives 133ml.