Bremick UNF Hex Nut, Grade 5, Zinc, 3/8", Box of 50

A hex nut is the standard six-sided nut. It is turned with a spanner or socket onto a bolt, stud or threaded rod of the same thread form, diameter and pitch. This is one Bremick UNF hex nut (UNF thread, Grade 5, zinc finish), size 3/8", supplied as a box of 50.

UNF is Unified National Fine Thread, and TPI is threads per inch. Threads per inch are shown for each size. Grade is the imperial strength level of a screw or nut, for example Grade 2, Grade 5 or Grade 8. On the Bremick class vs grade chart, Grade 5 is high tensile, alongside metric Class 8.8.

Where this product is used

• Fitting to bolts and studs, and to threaded rod cut to length
• Machinery mounting and frame assembly using studs
• Locking up bolted flanges and brackets, with a washer under the nut
• Interior frames and equipment where the part is kept out of the weather
• Medium-strength machinery and equipment work that needs more than Grade 2
• Only one size is supplied here (3/8"), check it against your drawing or the part you are replacing

Features

• Size 3/8"
• UNF thread, hex nut
• Grade 5, zinc finish
• Supplied as a box of 50
• Electroplated zinc finish: indoor and under-cover use
• Grade 5, medium-carbon quenched and tempered steel

Key specifications

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.

If the job moves outdoors, step up to a hot dip galvanised option; for coastal or splash-zone work, 316 stainless is generally the better choice.

What the grade means

Grade 5 is medium-carbon steel, quenched and tempered, in the SAE convention.

UNF is the fine inch thread: the finer pitch gives more threads per inch and a finer adjustment. It only mates with UNF nuts and tapped holes of the same diameter.

Fasteners are not lifting rated unless marked.

Choosing the right option

Match the nut to the bolt, stud or rod: thread form, diameter and pitch must all agree. Sizes are nominal thread diameters in inches. Compare the threads per inch with your bolt.

See also: Bremick UNF Hex Nut, Grade 8, High Tensile Steel, Plain, 7/16" to 7/8", Bremick UNC Hex Nut, Grade 5, High Tensile Steel, Zinc, 1/4" to 3/8", Bremick UNF Nylon Insert Lock Nut, Grade 5, Zinc, 1/4" to 7/8".