: The latest standard is JIS B 1188:2017 , which superseded the 1995 version. Key Specifications (Example M4 Dimensions)

: Often carbon steel (Class 4.8) with zinc yellow or clear zinc finishes.

By following these recommendations, we can ensure that socket head cap screws meet specific quality, safety, and performance standards, reducing the risk of failures and accidents.

: These screws are manufactured by mounting a washer onto a blank screw before the threads are rolled, ensuring the washer remains captive. Head Style

According to typical JIS B 1188 data sheets , the dimensions for a standard M4 screw include: : 4 mm Head Diameter (dk) : 7 mm Head Height (k) : 2.6 mm