Unifix Grade 10.9 Socket Button Head Screws - M10 x 25 - Grey

It is a classification of steel strength, indicating a high-tensile material capable of withstanding significant stress compared to standard carbon steel fasteners.

They are suitable for general use, but they lack the specific stainless steel or hot-dip galvanized coating required for prolonged exposure to rain or salt air.

These screws follow standard ISO metric coarse threading for M10 sizes.

Yes, you will need a standard metric Allen key or a socket head driver bit.

They are designed primarily for metal-to-metal mechanical connections. Using them in wood would require a matching threaded insert or nut.

Verify that the tapped hole matches the M10 thread pitch and check for any debris or metal shavings in the threading.

Ensure your hex key is not worn and is the correct metric size. Apply downward pressure while turning to maintain contact.