Hobson UNC Hex Bolt, 5/16 / 1-1/2

The Hobson UNC hex bolt range has 55 items (Grade 8, zinc plated): 1/4" to 1", in lengths of 1/2" to 14". A hex bolt has a hexagonal head and a threaded shank, and is fitted with a nut or screwed into a tapped hole. Grade 8 is high tensile, and corresponds to metric class 10.9.

UNC means Unified National Coarse Thread and TPI means threads per inch. Spanner sizes are the width across flats (A/F), using its grade 5 and 8 column. 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

• 55 items: 1/4" to 1", 1/2" to 14" long
• UNC thread, hex head
• Grade 8, zinc plated
• Minimum tensile strength for each size, shown for each size

Key specifications

Choosing the right option

Choose the thread form first: the bolt and its nut must match in thread form, diameter and pitch. Sizes are nominal diameters in inches; compare the threads per inch 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. Spanner size is the width across flats of the head and nut.

Related bolts: Hobson UNC Hex Bolt, Grade 8, Zinc, 1/4" to 1" x 1/2" to 10", Hobson UNC Hex Bolt, Grade 8, Zinc, 5/16" to 1" x 1" to 11" and Hobson UNC Hex Bolt, Grade 8, Plain, 1/4" to 2" x 1/2" to 20".