Bremick UNF Nylon Insert Lock Nut, 1/2"

A nylon insert lock nut is a hex nut with a nylon ring fitted in one end. The bolt or stud threads through the ring, which is the locking feature of the nut. There are 9 Bremick UNF nylon insert lock nut items (UNF thread, Grade 5, zinc finish): 1/4" to 7/8".

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. The pack or box quantity for each item is shown in the table. It changes with the size.

Where this product is used

• Vibration-prone assemblies such as motors, pumps, conveyors and guards, where a plain nut can work loose
• Machinery covers, brackets and linkages where a locking nut is wanted without a second nut or thread lock
• Assemblies that stay at normal workshop or outdoor temperatures (not for high-temperature use)
• 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
• Choosing between the 9 items here: they cover diameters from 1/4" to 7/8"

Features

• 9 items: 1/4" to 7/8"
• UNF thread, nylon insert lock nut
• Grade 5, zinc finish
• Pack quantity shown for each item
• IFI100NE named for the items the stock list covers
• Zinc plated: suited to dry, indoor and sheltered use
• Grade 5 medium-carbon steel, quenched and tempered

Key specifications

Choosing the finish

These nylon insert lock nuts are zinc plated, which means a thin electroplated layer of zinc over the steel. That is enough for dry, indoor or sheltered use; it is generally not recommended for external applications and is not suitable for treated pine.

For weather-exposed work, look at a hot dip galvanised version instead; within about 1 km of the sea, 316 stainless is generally the safer choice.

What the grade means

The nylon ring in this nut resists loosening from vibration. Do not use it in high-temperature locations, and expect the grip to reduce with repeated use.

In the SAE convention Grade 5 means medium-carbon, quenched and tempered steel.

The thread is UNF (Unified National Fine). A finer pitch means more threads per inch and finer adjustment, and the nut or tapped hole must also be UNF.

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 5, Zinc, 3/8", Box of 50, Bremick UNC Nylon Insert Lock Nut, Grade 5, Zinc, 10-24 to 1", Bremick BSW Nylon Insert Lock Nut, Zinc, 1/2", Pack of 200.