Hobson BH88ZCM060016 M6 x 16mm Metric Hex Bolt, G8.8, Zinc

There are 145 Hobson metric hex bolt items (G8.8, zinc): M6 to M24, in lengths of 16 to 200mm. 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 supplier names these items G8.8; in the Hobson chart the matching name is class 8.8.

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 (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.

For 3 of these items the supplier gives no description line, so only the size, length, class and finish from the item name are published: pack quantity and catalogue details are not stated.

Where this product is used

• Fabrication and repair work where the head can be reached with a spanner or socket
• Securing timber to steel brackets or flitch plates, with a flat washer under the head to protect the timber
• Replacing worn or missing bolts of the same thread form, diameter and length
• Dry, indoor and sheltered locations such as workshops, enclosed machinery and interior fit-out
• Machinery, frames and equipment where a high tensile bolt is specified
• Choosing between the 145 items here: they cover diameters from M6 to M24 and lengths from 16mm to 200mm.

Choosing the finish

A zinc plated finish gives light corrosion protection indoors and under cover. The coating is thin, so outdoor exposure without extra protection is generally not recommended, and treated pine calls for a different finish.

For weather-exposed work, look at a hot dip galvanised version instead; within about 1 km of the sea, 316 stainless is generally the safer choice.

What the grade means

Grade 8.8 is high tensile steel (medium carbon), and each size shows its minimum tensile strength (manufacturer-stated). Choose it where a 4.6 mild steel bolt would be too light for the job.

For load-critical, structural or lifting joints, confirm the fastener against the engineer's specification. Fasteners are not lifting rated unless marked.

Features

• 145 items: M6 to M24, 16 to 200mm long
• Metric thread, hex head
• G8.8, zinc
• Minimum tensile strength for each size from the Hobson guide, shown for each size (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)
• Zinc plated finish, for indoor and sheltered locations
• High tensile, medium-carbon steel in class 8.8

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, Class 8.8, Zinc Plated, M6 to M30 x 16 to 375mm and Hobson Metric Hex Bolt, G8.8, Galvanised, M12 x 30 to 50mm.