Imperial nuts UNC/UNF

UNC and UNF inch nuts — selection for bolted connections

An inch-threaded hexagon nut should match the screw, stud or threaded rod designation. When assembling parts for machines and servicing, compare thread series, nominal diameter and threads per inch. This category contains zinc-plated steel nuts in several pack sizes. The quantity in the name and product page is the content of the set sold.

How do UNC and UNF threads differ?

UNC denotes the coarse-thread series, while UNF denotes the fine-pitch series. At the same diameter, UNF has more threads per inch. For example, 1/2″ UNC has 13 TPI, while 1/2″ UNF has 20 TPI. These nuts require suitably matched screws. Matching diameter alone is insufficient. Converting an inch dimension to millimetres also does not mean compatibility with a metric thread.

Selected UNC nuts — sizes and packs

UNF nuts — sizes and packs

The tables list thread designations and quantities from product pages. Check current price and availability for the selected variant.

How do you select an inch nut?

• Read the complete thread designation. The designation 1/4–20 UNC specifies a diameter of 1/4 inch and 20 threads per inch. 1/4–28 UNF means the same diameter but a different thread.
• Check the mating component. If the marking is illegible, establish diameter and TPI from documentation or measurement with a suitable gauge.
• Compare the design. Consider material, coating, hexagon dimensions and strength requirements of the complete connection. Relate class or Grade markings on the product page to the documentation of the specific product.
• Choose the quantity. Packs of 1, 5, 10 and 25 pieces allow parts to be prepared for an individual repair or a series of connections.

Frequently asked questions about inch nuts

What does TPI mean?
TPI is the number of thread turns over one inch. It is not a pitch given in millimetres.

Does a UNC nut fit a UNF screw?
No. At the same size, the two series have different threads per inch. Choose the nut using the complete screw designation.

Does a quantity of 10 pieces mean a single nut?
No. This variant includes a set of ten nuts according to the product description.

Inch nuts — NERON Piła

NERON in Piła offers fasteners for workshops, servicing and industrial plants. When enquiring about inch nuts, state diameter, UNC or UNF series, TPI, required design and quantity. You can also send the machine documentation designation through the contact form. Other designs are found in the section for hexagon nuts DIN 934.