Hobson BF88Y6FM120050F M12 x 50mm Metric Fine Serrated Hex Flange Bolt, Class 8.8

The Hobson metric fine serrated hex flange bolt has a hex head with a flange under it, which acts as a built-in washer face, and a metric fine pitch thread (Class 8.8, zinc yellow). This page lists 2 items in M12, lengths 25 and 50mm.

Hobson lists class 8.8 as high tensile, and its class and grade chart pairs class 8.8 with imperial grade 5 (manufacturer-stated).

The supplier does not state the thread pitch for these fine pitch items, so none is published. Confirm the pitch before ordering matching nuts or tapped holes.

Hobson lists "serrated" as locking serrations on the bearing face of a bolt or nut (manufacturer-stated).

Every item is supplied as a box of 50.

Where this product is used

• Fastening with a nut or into a tapped hole, where the flange acts as a built-in washer under the head
• Replacing a hex flange bolt of the same thread form, diameter and length

Features

• 2 items: M12
• Metric fine pitch thread
• Class 8.8, zinc yellow
• Length 25 and 50mm
• Minimum tensile strength by size from the Hobson guide, shown in the table (manufacturer-stated)

Common specifications

Key specifications

Selecting the right option

Choose the thread form first: the screw and the nut or tapped hole must match in thread form, diameter and pitch. Fine pitch means a finer pitch than the standard coarse thread of the same diameter, so a standard metric nut will not fit. Length is measured from under the head to the end of the screw. Strength figures are the minimum tensile strengths for the class or grade and size range in the Hobson guide, which is a head-marking table, so treat them as the class or grade minimum and not a test result for the screw (manufacturer-stated).

Related products

Related items: Hobson Metric Hex Flange Bolt, Class 10.9, Plain, M14 x 35 to 70mm, Hobson Metric Hex Flange Bolt, Class 8.8, Zinc Yellow Passivate, M5, M6 and M8 and Hobson Metric Serrated Hex Flange Bolt, Class 8.8, Zinc Plated, M5 to M10.