Nutlock GD43

  • GD43 is a MEDIUM STRENGTH BLUE THREADLOCKER designed for locking and sealing threaded fasteners which require disassembly with standard hand tools. It cures in the absence of air between close-fitting metal surfaces to prevent the loosening of threaded fasteners due to vibrations.


  • Prevents loosening of threaded parts due to vibration.
  • Locks bolts and nuts up to 20mm diameter.
  • Chemical resistant against fuels,lubricants and gases.
  • Prevents leaking, corrosion and rust on threaded fasteners.
  • Can be used on bearings, bolts, nuts, screws and more…
  • Removable by hand tools for disassembly if required.
6ml Blister Pack – 12 Per Box 50-NUTLOCK0313
10ml Bottle – 10 Per Box 50-NUTLOCK0311
50ml Bottle – 10 Per Box 50-NUTLOCK0312
250ml Bottle – 10 Per Box 50-NUTLOCK2302


Anaerobics - Information Sheet - GlueDevil
Anaerobics (Thread Lockers) Information Sheet


Technical Data Sheet (TDS)

GLUEDEVIL Nutlock GD43 is a general purpose, medium-high strength, thixotropic anaerobic threadlocker. The product cures when confined in the absence of air on close-fitting metal surfaces.


GLUEDEVIL Nutlock GD43 is formulated to lock all metric and imperial nuts and bolts, preventing vibration loosening and leakage through the threads. GD43 is slightly oil tolerant, so it will bond some ‘as received’ parts, but best results are obtained with clean substrates. The thixotropic nature of the product prevents run off, dripping and migration after assembly. GD43 is typically used on mounting bolts, housing screws, etc. GD43 prevents corrosion of assembled parts.



Chemical type: Dimethacrylate

Appearance: Blue

Specific Gravity: 1.04

Viscosity1 cPs: (Range)1 10,000-18,000

(Typical Value)1      14,000

(Range)2                2,500-4,000

(Typical Value)2      3,300

Breakaway Torque2     N/m    Range 12-25

Typical 19

Prevail Torque2           N/m    Range 5-15

Typical 10

Fixture Time3                        (mins) £15

Full Cure @ 20°C                  (hours) 24

Flash Point                           (°C) >100

Max Gap Fill                         (mm) 0.30

Shelf Life @ 20°C                  (months) 12

Operating Temp Range          (°C) -50 to +150

1 Brookfield RVT, spindle 3, 2.5rpm

2  Brookfield RVT, spindle 3, 20rpm

3 On M10 black oxide steel bolt and M10 bright steel nut, ISO10964

4 ISO 10964


Typical curing speed3 on mild steel M10 nut and bolt (ISO 10964)

15 mins Finger tight

1 hour ~60% strength

24 hours 100% strength

Cure speed vs. Substrate

Cure speed and strength vary according to the substrates. When used on mild steel and brass components anaerobic adhesives will reach full strength more rapidly than more inert materials, such as stainless steel and zinc dichromate. An anaerobic Activator may be used to accelerate cure speed.

Cure speed vs. Bond gap

The size of the bond gap greatly affects the speed of cure of anaerobic adhesives. Bond gap varies with thread type and size of the fastener. The larger the gap between threads, the slower the cure speed. Maximum recommended gap for  GD43 is 0.30mm.

Cure speed vs. Temperature

All figures relating to cure speed are tested at 22°C. Lower temperatures will result in slower cure. Heating the assembled parts accelerates the curing process.

An activator should be used when the temperature is less than 5°C.

Cure speed vs. Activator

Where speed of cure is too slow or the bond gap is very large, Glue Devil Anaerobic Activator may be used to accelerate cure speed. The use of an accelerator may reduce bond strength by up to 30%. Glue Devil recommends testing on the parts to measure the effect.


Hot strength

GlueDevil Nutlock GD43 is suitable for use at temperatures up to 150°C. At 130°C the bond strength will be ~50% of the strength at 21°C.

Heat ageing

GlueDevil Nutlock GD43 retains over ~90% full strength when heated to 100°C for 90 days then cooled and tested at 21°C.

Chemical / Solvent Resistance

GlueDevil anaerobics exhibit excellent chemical resistance to most oils and solvents including motor oil, leaded petrol, brake fluid, acetone, ethanol, propanol and water. Anaerobic adhesives and sealants are not recommended for use in pure oxygen or chlorine lines.


GD43 is suitable for most standard diameter, medium to coarse-threaded screws, nuts and bolts. Not recommended on certain plastics as stress cracking can sometimes result. Some anti-corrosion chemicals inhibit the cure system in this type of anaerobic. Trials are recommended to establish whether cleaning of the parts is necessary. An activator may be required on plated parts.

Ensure parts are clean, dry and free from oil and grease.

Apply adhesive to all engaged threads. Assemble parts and allow to cure. Wipe excess adhesive from outside of joint.

Product is normally hand applied from bottle. Dispensing systems are available for high volume assembly applications. Please contact your GlueDevil representative for further advice on dispensing solutions.

Anaerobic adhesives only cure in the absence of air and with metal part activation. Adhesive outside the joint will remain uncured and may be wiped away with a cloth.


For safe handling of this product consult the Material Safety Data Sheet (MSDS).

Important: Product packed in bulk (≥5KG) has a shelf life of 6 months. The material must be filled into bottles or tubes within this time period.


GD43 is not recommended on certain plastics as stress cracking can sometimes result. Some anti corrosion chemicals inhibit the cure system in this type of anaerobic.

Trials are recommended to establish whether cleaning of parts is necessary. The GD Anaerobic Activator might be required on plated parts


Bottles:10ml, 50ml and 250ml.

Currently available only in bulk >25kg for use with dispensing systems.

Please Note: When packed an air space above the product is vital to maintain stability.


Store in a cool area out of direct sunlight. Optimal storage conditions are between 8°C and 21°C. Storage outside this temperature range can adversely affect the product properties and may affect the stated shelf life. Refrigeration to 5°C gives optimum storage stability.


The data contained in this data sheet may be reported as a typical value and/or range. Values are based on actual test data and are verified on a regular basis.


The information contained herein is produced in good faith and is believed to be reliable but is for guidance only. Glue Devil and its agents cannot assume liability or responsibility for results obtained in the use of its product by persons whose methods are outside or beyond our control. It is the user’s responsibility to determine the suitability of any of the products and methods of use or preparation prior to use mentioned in out literature and furthermore the user’s responsibility to observe and adapt such precautions as may be advisable for the protection of personnel and property in the handling and use of any of our products.