Metric Class 12.9 Socket Head Cap Screws

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130,000 psi to 149,999 psi

150,000 psi or greater

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About Socket Head Screws

Alloy Steel Socket Head Screws

The standard for high-strength fastening.

Left-Hand Threaded Alloy
Steel Socket Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening.

Alloy Steel Thread-Locking Socket Head Screws

With a tensile strength of 170,000 psi, these alloy steel screws are among the strongest we carry. They are stronger than Grade 8 steel screws and are nearly two and a half times stronger than stainless steel thread-locking screws. They have a thread locker to prevent loosening from vibration.

Flanged Socket Head Screws

These general purpose flanged screws distribute pressure where the screw meets the surface, eliminating the need for a washer.

Metric Alloy Steel Hex Drive Flat Head Screws

Metric Steel Torx Flat Head Screws

These metric screws are twice as strong as standard steel Torx flat head screws.

Metric Alloy Steel Button Head Hex Drive Screws

These metric alloy steel screws are nearly twice as strong as stainless steel button head screws.

Socket Head Screw Assortments