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NINGBO STEEL BOLT
CO., LTD
Address:Panjiashan, Xiepu Town, Zhenhai, Ningbo, China
Tel:
+86-574-86231358
Fax:
+86-574-86231338
Email:
bolt@ningbo-bolt.com
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Bolts
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For the property classes 4.8, 5.8 and 6.8 the values for Rpf min are
under investigation. The present values are given for calculation of
the proof stress ratio only. They are not test values.
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Hardness determined at the end of a fastener shall be 250 HV, 238 HB
or 99,5 HRB maximum.
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Any increase in hardness at the surface which indicates that the
surface hardness exceeds 390 HV is not acceptable.
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