4-40 UNC x 1/8 Inch Socket Cap Head Screw, Self Colour Grade 12.9 Steel (ASME B18.3)

4-40 socket cap head screw

Socket cap head screw designed with a deep internal socket allowing application of the required torque for a secure assembly in construction, machinery, and automotive applications.

Designed for maximum performance in demanding environments and manufactured in self colour grade 12.9 Steel. With a distinctive compact cylindrical head that sees these socket cap head screws used when space is tight.

Available in many sizes and lengths and installed with an Allen wrench or hex key (Allen key) which sees these socket cap head screws widely used across many industries. 

Versatile and used by DIY enthusiasts and professionals across many diverse sectors including automotive, aerospace, machinery, and construction.

4-40 socket cap head screw specification:

• Diameter (TD): 4-40
• Threads per inch (TPI): 40
• Length (L): 1/8 inch
• Thread length (TL): 0.75 inch min – 0.99 inch max
• Head width (HW): 0.183 inch max
• Head height (HH): 0.112 inch max
• Head type: Cap head
• Recess type (DT): Internal hex drive (3/32 inch)
• Material: Grade 12.9 steel
• Finish: Self colour
• Conformity: ASME B18.3
  

Part of an extensive range of UNC self colour cap head screws available from Fusion Fixings with bulk discounts.

Why Buy from Fusion Fixings?

With over 40 years of industry expertise, Fusion Fixings is your go-to supplier for top-quality fasteners and fixings. We’re a proud family-run business offering:

Competitive prices and bulk discounts with a growing range held in stock
Low minimum order quantities, starting from just one to as many as you need
Fast shipping and dependable service