Loctite 248 Medium Strength Threadlocker Stick 19g

Loctite 248 is a one-component, blue, medium strength anaerobic threadlocker supplied as a self-feeding, wax-like stick. It locks threaded fasteners and can be removed with standard hand tools.

The stick suits applications where liquid product might run or be hard to apply. It fluoresces under UV light, and the cured joint is removed with hand tools or, where engagement length prevents that, local heat.

Where this product is used

• Nuts, bolts and screws that need locking and later removal with standard hand tools
• Applications where liquid product might run or be hard to apply
• Locking threaded fasteners on steel and stainless steel (breakaway data in the specification)
• Fasteners where activator SF 7471, SF 7649, SF 7091 or SF 7088 is used to speed cure over larger gaps (test first)

Features

• Medium strength, removable with standard hand tools
• Blue, wax-like stick, self-feeding
• One component, no mixing
• Positive fluorescence under UV light, useful for inspection
• Melting point above 65 °C
• Anaerobic cure
• Breakaway torque 23 N·m on M10 black oxide steel

Key specifications

Selecting the right option

Loctite 248 is the stick format. For a liquid medium strength grade see Loctite 243 Medium Strength Threadlocker or Loctite 242 Threadlocker Anaerobic Adhesive Blue 50ml. For a liquid low strength grade see Loctite 222 Low Strength Threadlocker; for a high strength stick see Loctite 268 High Strength Threadlocker Stick 19g.

Using it

Henkel states activators SF 7471, SF 7649, SF 7091 and SF 7088 can speed cure over larger gaps but can reduce final strength, so test first.

Cure speed depends on the materials, the gap and the temperature; the cure-speed graphs are in the Henkel data sheet.

Remove with standard hand tools. Where engagement length prevents this, heat the nut or bolt to approximately 250 °C and disassemble while hot.

Storage and handling

Store unopened in a dry location. Optimal storage is 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. Not normally recommended for plastics, particularly thermoplastics, because of stress cracking. Check compatibility with aqueous wash cleaning. Oily threads reduce strength: see the oil contamination figures in the specification. Read the safety data sheet before use.

Frequently asked questions

What strength is Loctite 248?

Medium strength. It can be removed with standard hand tools.

How much torque does Loctite 248 take to break away?

On M10 black oxide steel nuts and bolts, cured 24 hours at 25 °C (ISO 10964), Henkel gives 23 N·m breakaway (unseated) and 25 N·m breakloose (pre-torqued to 5 N·m).

How do I remove Loctite 248?

With standard hand tools. If long thread engagement prevents this, heat the nut or bolt to about 250 °C and disassemble while hot.

Can Loctite 248 be used on plastics or in oxygen systems?

No. It is not normally recommended for plastics (particularly thermoplastics), and is not recommended for pure oxygen or oxygen-rich systems or as a sealant for chlorine or other strong oxidisers.

Does oil on the thread affect Loctite 248?

Yes. On M10 black oxide bolts re-oiled for 168 hours at 22 °C, strength was 61% of the unoiled control with emulsion oil and 96% with solvent-based oil.

Does Loctite 248 have any 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 243 Medium Strength Threadlocker, Loctite 242 Threadlocker Anaerobic Adhesive Blue 50ml, Loctite 222 Low Strength Threadlocker, Loctite 268 High Strength Threadlocker Stick 19g, Loctite 263 High Strength Threadlocker.