Hex / Socket / Cross recess screws can be supplied with integrated plain / Disk / wave washer. For this purpose special washer are used having smaller ID. The screws and washer are assembled and then the thread rolling operation is performed so that the washer does never come out of the screw.

Specification:

Hex / Socket / Cross recess screws can be supplied with integrated spring washer alone. For this purpose special spring washer are used having smaller ID. The screws and washer are assembled and then the thread rolling operation is performed so that the washer does never come out of the screw. For all such screws hydrogen de-embittlement operation is performed after surface treatment.

Specification:

The above screws can have both plain and spring washers together for class 8.8 and above combination screws, the screws are first heat treated separately, the washers are assemled and thereafter the threadin operation is carried out on the hardent shank. For all such screws hydrogen de-embittlement operation is performed after surface treatment.

Specification: