Hobson CBPG8PC0370100 3/8" x 1" UNC Square Neck Plough Bolt, Grade 8, Plain

The Hobson UNC square neck plough bolt has a square neck under the head, which seats in a square hole to stop the bolt turning, and a UNC thread (Grade 8, plain). This page lists 26 items: 3/8", 7/16" and 1/2", in lengths from 1" to 4".

Hobson lists grade 8 as high tensile, and its class and grade chart pairs imperial grade 8 with metric class 10.9 (manufacturer-stated).

The Hobson acronym list defines UNC as Unified National Coarse Thread and TPI as threads per inch. The table gives the threads per inch from the Hobson thread table, for the sizes it lists (manufacturer-stated).

The square neck seats in a square hole, so check the hole as well as the bolt diameter and length.

Pack quantity is shown for each item in the table.

Where this product is used

• Fitting through a square hole so the square neck stops the bolt turning while the nut is tightened
• Replacing a plough bolt of the same thread form, diameter and length

Features

• 26 items: 3/8", 7/16" and 1/2"
• UNC thread, threads per inch shown in the table
• Grade 8, plain
• Length 1" to 4"
• 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. Sizes are nominal diameters in inches; compare the threads per inch in the table with your nut or tapped hole. Check the length against the thickness of the parts being joined, including the square neck. 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 UNC Square Neck Plough Bolt, Grade 9, Plain, 5/8" to 1-3/8" and Hobson UNC Stepped Plough Bolt, Grade 9, Plain, 5/8" x 2-3/4", Box of 100.