Hobson UNF Hex Bolt, 1/4 / 1-1/4

The Hobson UNF hex bolt range has 13 items (Grade 5, zinc plated): 1/4" to 7/16", in lengths of 1/2" to 4-1/2". A hex bolt has a hexagonal head and a threaded shank, and is fitted with a nut or screwed into a tapped hole. Grade 5 is high tensile, and corresponds to metric class 8.8.

UNF means Unified National Fine 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

• 13 items: 1/4" to 7/16", 1/2" to 4-1/2" long
• UNF thread, hex head
• Grade 5, zinc plated
• Minimum tensile strength for each size, shown for each size
• Pack quantity shown for each item

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 UNF Hex Bolt, Grade 5, Plain, 1/4" to 7/16" x 1" to 4", Hobson UNF Hex Bolt, Grade 5, Zinc, 1/4", 5/16" and 3/8" x 1" to 3" and Hobson UNF Hex Bolt, Grade 5, Plain, 1/4" to 7/8" x 1-1/4" to 6".