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