1/2 (20) UNF x 4 Inch Hex Bolt, Bright Zinc Plated Grade 8.8 (ASME B18.2.1)

1/2 UNF Bolt

UNF bolt with a hex head allowing you to apply the required torque easily with a range of conventional tools.

A part threaded bolt with a unified fine thread (UNF) manufactured from grade 5 (8.8) steel with a bright zinc plating (BZP) which offers a mid-level resistance to corrosion.

The unthreaded shank below the hex head adds overall strength making this hex head bolt more resistant to vibration and shear forces when installed into the correctly drilled hole.

Engineered to get the job done and widely used across many industries by DIY enthusiasts and professional alike.

1/2 UNF bolt specification

• Thread diameter (TD): 1/2 (20) UNF
• Thread per inch (TPI): 20
• Length (L): 4 inch
• Thread length (TL): 1.500 inch max
• Head width (HW): 0.750 inch max
• Head height (HH): 0.323 inch max
• Material: Grade 5 (8.8) steel
• Finish: BZP bright zinc plated

Versatile, widely used, and part of a growing range of hex bolts held in stock at competitive prices.

Quantities start from just one to as many as you require to get the job done.

Dont forget the UNF hex nuts!

Do you need the UNF hex nuts to go with the bolts? If so, take a look at our BZP 1/2 UNF hex nut.

Do you need a UNF bolt with increased corrosion resistance?

If you require a UNF bolt with increased corrosion resistance, then take a look at the stainless steel 1/2 UNF x 4 inch hex bolt, that offers a high level of corrosion resistance.