Socket Cap Screw I=3

What is this product? : Assembled screw is also known as SEMS screw. This type of fasteners are pre-assembled with unremovable washer or spring washer with the bolt or screw, to give better user experience in both speed of assembly and safety. There are several types of assembled screw such as P=1, P=3, I=2 and etc.

Please see below information for some explanation of each type,

First, JIS standard
P=1 : Screw assembled with flat washer(JIS)
P=2 : Screw assembled with spring washer(JIS)
P=3 : Screw assembled with flat washer and spring washer(JIS)
P=4 : Screw assembled with flat washer and spring washer for socket cap screw(JIS), in the other word, small outer diameter washer and spring washer that have the same outer diameter as socket cap screw head.

Next, ISO standard
I=1 : Screw assembled with flat washer(ISO)
I=2 : Screw assembled with spring washer(ISO)
I=3 : Screw assembled with flat washer and spring washer(ISO)
I=4 : Screw assembled with flat washer and spring washer for socket cap screw(ISO), in the other word, small outer diameter washer and spring washer that have the same outer diameter as socket cap screw head.

There are mostly these 2 standards for assembled screw but the market there are other type of assembled screw as well such as assembled with different kind of washer custom made.

How to use? : Application is same as other machine screw, just fasten it into the threaded drilled hole with spanner or wrench but there is no need to assemble with washer or spring washer.

Where to use, what kind of business using this product? : Due to these are upgraded version  of screw and bolt which are assembled with washer and spring washer, made these fasteners be able to use anywhere where those screw or bolt are currently using. But main point of these assembled screw there are 2 points which are, labor working time saving for assemble washer and spring washer with those screw or bolt, and safety for user who are working in height concerned area, this will help user prevent accident of assemble part falling at those working place.

If you are looking for good quality assembled screw, please feel free to contact us. We do have assembled screw in several plating and sizes, start from 1 piece. We also provide custom made according to your drawing as well.


Socket Cap Screw I=3(ISO) : We have fasteners over 700,000 SKU IN STOCK from M1 - M100 l Start from 1 piece, Ship from Japan to the world everyday.