Metric 10.9 Bolts

METRIC 10.9 HEX HEAD CAP SCREWS  are typically manufactured from medium alloy carbon steel, quenched and tempered for strength, usually black oxide (plain) finish.  They have a minimum tensile strength of 940 MPa (M5 to M39) and generally agreed to be the equivalent to Imperial Grade 8 bolts.  Length is measured from under the head.

10.9 bolts are identified with "10.9" marking on the head.  Coarse threads are most common.  The number preceding ".", ie 8.8, 10.9, 12.9  refers to the maximum load that the fastener can handle as a percentage of its ultimate tensile strength, ie:  80 or 90 %.  Torquing or loading beyond the safe limit, known as the elastic range, often causes the fastener to suffer an unrecoverable stretch & deformation resulting in shear or fractional failure.


Zinc Plate or Fine Thread by special order, ask your rep to confirm availability.

Fasten it Right...The First Time

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