|To use space saving bolt and screws, customer ask hardness sometimes.
|Base on standard products like DIN912 socket cap screw and
DIN7984 low head cap screw satisfied hardness demand.
|In the case of extra low head cap screw, head hardness
and thread hardness are often different. (ex. Head 5.8 / thread 8.8)
|To make clear in your mind, we show you head height order below.
310Slim＜Ex Low Head ＜DIN7984＜DIN912 Hex Socket Cap