Hobson BS88ZCM050012 M5 x 12mm Metric Hex Set Screw, Class 8.8, Zinc plated

The Hobson metric hex set screw has a hex head and a metric thread, and is fitted into a tapped hole or through a clearance hole with a nut (Class 8.8, zinc plated). This page lists 165 items: M5 to M30, in lengths from 12 to 300mm.

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 pitch shown for each size is the coarse pitch given in the Hobson thread table (manufacturer-stated).

The High Tensile Stock List heading for the catalogue items names AS1110.2; items not in that list do not carry the standard here (manufacturer-stated).

Pack quantity is shown for each item in the table.

Where this product is used

• Fitted into a tapped hole, or through a clearance hole with a nut and washer, to clamp parts together
• Replacing a hex head screw of the same thread form, diameter, pitch and length
• Machinery, equipment and fabrication work where a hex head screw is called for

Features

• 165 items: M5 to M30
• Metric thread, pitch shown in the table
• Class 8.8, zinc plated
• Length 12 to 300mm
• Minimum tensile strength by size from the Hobson guide, shown in the table (manufacturer-stated)
• AS1110.2 named by Hobson for these items (manufacturer-stated)

Common specifications

Pitch and strength by diameter

Figures by diameter: pitch from the Hobson thread table and minimum tensile strength from the Hobson guide (manufacturer-stated).Strength figures are class or grade minimums from a head-marking table, not test results for the screw.

Key specifications

Pack weights are as printed in the Hobson High Tensile Stock List, April 2011 (manufacturer-stated), for the pack shown. A dash means the item has no row in that list or the list pack quantity differs.

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. Metric sizes are the nominal diameter in millimetres; compare the pitch in the table with your nut or tapped hole. Length is measured from under the head to the end of the screw. Check the across-flats size of the head before choosing a spanner; no spanner size is published for these items. 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). For a different strength level see Hobson Metric Hex Set Screw, Class 4.6 UTS, Plain, M16, M20 and M24.

Related products

Related items: Hobson Metric Hex Set Screw, Class 4.6, Mild Steel, Zinc Plated, M6 to M16, Hobson Metric Hex Set Screw, Class 10.9, Zinc Plated, M6 to M36 and Hobson Metric Hex Set Screw, Class 8.8, Hot Dip Galvanised, M24 x 170mm, Pack of 4.