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The Unifix Grade 10.9 Socket Countersunk Head Screws are engineered for professionals and DIY enthusiasts requiring high-tensile strength for demanding structural and mechanical assemblies. Featuring a durable Grade 10.9 steel construction and a bright zinc-plated finish, these screws offer excellent corrosion resistance and reliability in heavy-duty environments. While their countersunk design provides a flush, clean finish, users should ensure they have the correct size hex key to avoid cam-out or stripping during the installation of these M16 x 45 fasteners.
| Colour | Silver |
|---|---|
| Model Part Number | 1355387 |
| Brand | Unifix |
Grade 10.9 refers to the mechanical properties of the steel, indicating a high-tensile strength suitable for heavy-duty industrial fastening.
They feature a zinc-plated finish that provides some corrosion resistance, but they are primarily designed for indoor or protected mechanical environments.
While they can be used in wood if properly countersunk, they are designed for metal-to-metal mechanical applications.
No, DIN 7991 is the standard for the physical dimensions and geometry of the socket countersunk head, not the thread pitch or diameter.
You will need a hex key or hex-bit socket that matches the specific size for M16 hardware.
Verify that the hex key is the correct metric size and is not worn down; if the head is stripped, use a screw extractor.
The countersink depth is insufficient; use a larger countersink drill bit to deepen the recess.
Installation requires an appropriately sized hex key (Allen wrench). Before installing, ensure the substrate is properly countersunk at the correct angle to accommodate the head profile.
