Hobson BH88ZCM060055 M6 x 55mm Metric Hex Bolt, Class 8.8, Zinc Plated

This page lists 66 Hobson metric hex bolt items (Class 8.8, zinc plated): M6 to M30, in lengths of 16 to 375mm. A hex bolt has a hexagonal head and a threaded shank, and is fitted with a nut or screwed into a tapped hole.

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 Hobson High Tensile Stock List (April 2011) prints the heading Class 8.8 AS1110.1 / Class 8 AS1112.1 for the catalogue items on this page (manufacturer-stated).

Thread length is the Thread (mm) column of the High Tensile Stock List, shown for the items that appear in it (manufacturer-stated).

Spanner sizes are the width across flats (A/F) from the Hobson spanner chart, using its class 4.6/8.8 column (manufacturer-stated).

Pack quantity is shown for each item.

Where this product is used

• Clamping parts together through a clearance hole, with a nut on the far side
• Screwed into a tapped hole of the same thread where a nut cannot be fitted
• Fixing with a flat washer under the head or nut to spread the load

Features

• 66 items: M6 to M30, 16 to 375mm long
• Metric thread, hex head
• Class 8.8, zinc plated
• Minimum tensile strength for each size from the Hobson guide, shown on each item page (manufacturer-stated)
• Catalogue pack weights shown where the Hobson stock list prints them (manufacturer-stated)
• Class 8.8 AS1110.1 / Class 8 AS1112.1 named by Hobson for catalogue items (manufacturer-stated)

Common specifications

Key specifications

Pack weights are as printed in the Hobson High Tensile Stock List, April 2011, and apply to the pack shown (manufacturer-stated).

Selecting the right option

Choose the thread form first: the bolt and its nut must match in thread form, diameter and pitch. Metric sizes are the nominal diameter in millimetres; compare the pitch shown for each item with your nut. Length is measured from under the head to the end of the bolt, so choose size and length together. 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 bolt (manufacturer-stated). Spanner size is the width across flats of the head and nut, from the Hobson spanner chart.

Related products

Related bolts: Hobson Metric Hex Bolt, Class 8.8, Hot Dip Galvanised, M8 to M48 x 20 to 450mm, Hobson Metric Hex Bolt, G8.8, Galvanised, M12 x 30 to 50mm and Hobson Metric Hex Bolt, G8.8, Zinc, M6 to M24 x 16 to 200mm.