Hobson BHG5ZF0250125 1/4" x 1-1/4" UNF Hex Bolt, Grade 5, Zinc Plated

This page lists 13 Hobson UNF hex bolt 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.

Hobson lists grade 5 as high tensile, and its class and grade chart pairs imperial grade 5 with metric class 8.8 (manufacturer-stated).

The Hobson acronym list defines UNF as Unified National Fine Thread and TPI as threads per inch. Each item shows the threads per inch from the Hobson thread table, for the sizes it lists (manufacturer-stated).

Spanner sizes are the width across flats (A/F) from the Hobson spanner chart, using its grade 5 and 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

• 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 from the Hobson guide, shown on each item page (manufacturer-stated)
• Pack quantity shown for each item

Common specifications

Key specifications

Selecting 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. 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 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".