M5 x 45mm Socket Cap Head Screw, Self Colour, Grade 12.9 high tensile steel, DIN 912

M5 Socket Cap Head Screw

M5 cap head screw with a deep internal socket drive (Allen key) allowing easy installation, loosening, and the application of torque for a secure hold.

A self-colour machine screw manufactured from grade 12.9 high tensile steel for strength with a compact cylindrical head that’s ideal when space is tight.

Easily installed and loosened with an Allen wrench or hex key (Allen key) which sees them widely used across many industries including automotive, aerospace, machinery, electronics, and construction.

Often referred to as cap head bolts in the trade but also known as an Allen key bolt or socket screw.

Available in a large number of sizes and lengths, these socket cap head screws are used by both DIY enthusiasts and professionals across many diverse sectors.

M5 socket cap head screw specification:

• Diameter (TD): M5 - 5mm
• Length (L): 45mm
• Thread length (TL): 22mm min
• Head width (HW): 8.5mm max
• Head height (HH): 5mm max
• Head type: Cap Head
• Recess type (DT): Internal hex drive (Size 4mm)
• Pitch: 0.80mm
• Material: Grade 12.9 high tensile steel
• Finish: Self colour
• Conformity: DIN 912

A self-colour socket cap head screw part of an extensive range available from Fusion Fixings.

Don't forget the self-colour M5 hex nuts

Don't forget the hex nuts to go with the cap head screws? Take a look at our self colour M5 hex nuts.

Looking for a cap head screw with corrosion resistance?

If you need a socket cap head screw with a high level of corrosion resistance, take a look at our A2 stainless steel M5 x45mm socket cap head screws.

For the highest level of corrosion resistance, Fusion Fixings supply M5 x 45mm socket cap head screws in A4 stainless steel which offer a marine grade resistance to corrosion.

FAQs about self-colour cap head socket screws

What does “Grade 12.9” mean with socket cap head screw?

Grade 12.9 refers to a high-tensile steel strength class. It means the screw has an ultimate tensile strength of 1200 MPa (or approximately 175,000 psi) making it one of the strongest metric fasteners available.

Grade 12.9 is typically used in engineering, automotive, machinery and heavy-duty applications where maximum strength is required.

What is a “self-colour” finish?

“Self-colour” means the screw is supplied in its natural steel finish after heat treatment. The screws are sometimes lightly oiled or treated with a black oxide.

Are grade 12.9 socket cap screws corrosion-resistant?

No, these cap head screws are not corrosion resistant and the self-colour or black oxide finish gives limited resistance, making them not suitable for external conditions.

How is the length of the cap head screw measured?

The length of these screws is measured from under the head to the end of the thread, not including the head height.

Can I use grade 12.9 screws in high-temperature or vibrating applications?

Yes, these grade 12.9 screws are suitable for high operating temperatures and perform well in vibration-prone environments such as engines or machinery where they are widely used.