LOCTITE 248/19G – Medium Strength Threadlock (Stick)

Loctite 248/19G – Medium Strength Threadlock

LOCTITE 248 is a general purpose threadlocker with medium bond strength. This product is available in a convenient stick format. This threadlocker secures and seals bolts, nuts and studs to prevent loosening due to vibration. The product works on all metals, including passive substrates such as stainless steel, aluminium and plated surfaces. It is proven to be tolerant of minor contamination due to industrial oils, e.g. engine oils, corrosion prevention oils and cutting fluids.

Loctite 248 is a medium strength anaerobic threadlocking material. It is supplied as a wax-like semi-solid, conveniently packaged in a self-feeding stick applicator. As with liquid anaerobic products, this material develops its cured properties in the absence of air when confined between close fitting metal surfaces. It achieves consistent strength and can be used on a variety of metal substrates.
It is particularly well suited for applications where a liquid product may be too fluid to stay on a part or be difficult to apply. It stores easily and allows for direct contact to a threaded part during application to ensure even coverage.

Product Description

Technology: Acrylic
Chemical Type: Dimethacrylate ester
Appearance (uncured): Blue, wax consistency
Appearance (form): Stick
Fluorescence: Positive under UV light
Components: One component: Requires no mixing
Cure: Anaerobic
Application: Threadlocking
Strength: Medium

Typical Curing Performance

Cure Speed vs. Substrate
The rate of cure will depend on the substrate used. The graph shown in the data sheet shows the breakloose strength developed with time on M10 black oxide steel bolts and mild steel nuts compared to different materials and tested according to ISO 10964. All samples pre-torqued to 5 N·m. Product applied to bolts only.

Cure Speed vs. Temperature
The rate of cure will depend on the temperature. The graph shown in the data sheet shows the breakloose strength developed with time at different temperatures on 3/8 x 16 degreased steel nuts & bolts and tested according to ISO 10964. All samples pre-torqued to 5 N·m. Product applied to bolts only.

Cure Speed vs. Activator
Where cure speed is unacceptably long due to large gaps, applying activator to the surface may improve cure speed. However, this can reduce ultimate strength of the bond and therefore testing is recommended to confirm effect. The graph shown in the data sheet shows the breakloose strength developed with time using Activator 7471 and 7649 on 3/8 x 16 zinc dichromate nuts and bolts and tested according to ISO 10964. All samples pre-torqued to 5 N·m. Product applied to bolts, activator to nuts.

Typical Properties of Uncured Material
Specific Gravity @°C: 1.03
Unworked Penetration, ISO 2137, 1/10 mm: 90 to 140
Melting Point, °C: >65

Typical Performance of Cured Material
Adhesive Properties:

Cured for 1 hour @ 25 °C
Breakloose Torque, ISO 10964, Pre-torqued to 5 N·m:
3/8 x 16 steel nuts (grade 2) and bolts (grade 5) (degreased): N·m ≥7 (lb.in.) (≥62)

Cured for 4 hours @ 25 °C
Breakloose Torque, ISO 10964, Pre-torqued to 5 N·m:
3/8 x 16 stainless steel nuts and bolts: N·m ≥6 (lb.in.) (≥53)

Cured for 24 hours @ 25 °C
Breakaway Torque, ISO 10964, Unseated:
3/8 x 16 steel nuts (grade 2) and bolts (grade 5) (degreased): N·m 13 (lb.in.) (120)
M10 black oxide bolts and steel nuts (degreased): N·m 23 (lb.in.) (200)
3/8 x 16 stainless steel nuts and bolts (degreased): N·m 12 (lb.in.) (110)

Breakloose Torque, ISO 10964, Pre-torqued to 5 N·m:
3/8 x 16 steel nuts (grade 2) and bolts (grade 5) (degreased): N·m 8 to 32 (lb.in.) (70 to 285)
M10 black oxide steel nuts and bolts (degreased): N·m 25 (lb.in.) (225)
3/8 x 16 stainless steel nuts and bolts N·m 18 (lb.in.) (160)

Cured for 168 hours @ 22 °C
Breakaway Torque, ISO 10964, Unseated,
Oil Tolerance: M10 black oxide steel bolts and mild steel nuts degreased and then reoiled in noted oil type. Data presented as a % of unoiled control.
Emulsion Oil: Aquasafe 21 61
Solvent-Based oil: SafeCoat DW 30X 96

Storage
Please store this product in the unopened container in a dry location.
Further storage information may be indicated on the product container labeling.

Safety information
Use only in well-ventilated areas.
Gloves and safety glasses should be worn.
Prolonged or repeated skin contact should be avoided to minimise any risk of sensitisation.
Store in original containers at 8-21°C (46.4-69.8°F) and do not return residual materials to containers as contamination may reduce the shelf life of the bulk product.

Not sure if this product is right for you?
If you are not sure if this product is right for your requirements, please contact our friendly sales team and they will be able to help you.