Gala Precision Engineering develops wedge lock washer— GALLOCK

These washers have been approved by Indian Railways and the company is the first Indian firm to supply wedge lock washers for LHB and ICF railway coaches.
Gala Precision Engineering develops wedge lock washer— GALLOCK

Gala Precision Engineering, one of the leading manufacturers of disc springs in Asia, has successfully developed wedge lock washer, GALLOCK. These washers are used to safely secure bolted joints exposed to heavy vibrations and dynamic load.


The new product consists of two flat washers having cam angled surfaces on one side & radial knurling over the other side. Radial knurling on the outer side of washer locks radial movement. Cam angle on the inner side is designed in such a way that, cam angle is greater than the bolts thread helix angle. If there is any movement along the joint, it will happen over the cam surfaces of the washer. Cam surface will generate push out force within washer which leads to an automatic increase of clamping force in the opposite direction & prevent self-loosening.


As per the release issued by the company, GALLOCK washers are successfully tested & approved at Indian Railways and the this is the first Indian company to get approval to supply wedge lock washers for LHB & ICF railway coaches.

Junker test was carried out in the German Institute, IMA Dresden. The product met Test according to DIN-65151 standards and certified its conformity with the requirements of the standard DIN 25201-4.

The test confirms that these washers lock screw or bolt connections safely. The clamp force drop remains within acceptable limits even after 2000 cycles and just a minimal amount of tension dissipates at the beginning of the test due to the normal settlement of the fastened joint.

Junket test at IMA Dresden confirms the performance of GALLOCK is at par with leading wedge lock manufacturers in Europe. Apart from this, the new product has passed Co-efficient of friction test as per ISO-16047; Sacrificial Cathodic Protection Test as per ISO-9227/ASTM-B117 for 72 hours; Salt Spray Test of Zinc flake surface coating as per ASTM-B117:2016 for 720 Hours and Methyl Ethyl Ketone (MEK) rub test shows no chipping of coating after 30 rubbing cycles.

The company also has an in-house Junker testing facility to ensure consistent high-quality supply to their global customers. The product is also offered with zinc flake coating to ensure a long product life cycle & yielding up to 1000 hours of salt spray life. The company can also conduct special tests to ensure uniform coating thickness & secure adhesion of the coating on the surface.

These washers are used in industries like energy generation (wind), off-highway applications, heavy vehicles, railways, transportation, construction and manufacturing & processing. The number of industries that use these washers is continuously growing.


GALLOCK washers are successfully tested and approved at Indian Railways. Gala Precision Engineering is the first Indian company to supply wedge lock washers for LHB and ICF railway coaches and also to get an approval.

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