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The Range£19.27Visit shop Unifix Grade 10.9 Ht Fine Pitch Hexagon Setscrews M10 (1.25) X 40 - Grey
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The Unifix Grade 10.9 HT Fine Pitch Hexagon Setscrews are engineered for construction and engineering professionals who require high-tensile reliability in heavy-load applications. With their M18 (1.5) x 50 specifications, these screws offer superior strength and precision-focused fine pitch threads, though users should ensure they are matched with compatible hardened nuts to maintain the integrity of the 10.9 grade assembly.
| Colour | Grey |
|---|---|
| Model Part Number | 1261055 |
| Brand | Unifix |
Grade 10.9 refers to high-tensile steel with a nominal tensile strength of 1000 MPa and a yield strength of 900 MPa.
The standard finish is meant for general engineering; if used outdoors, they may require additional protective coatings to prevent rust.
Fine pitch threads offer more contact surface area, which improves resistance to vibration and allows for more precise tensioning.
While often used multiple times, inspect for thread deformation or stretching before reusing, especially in critical structural applications.
Standard M18 hexagonal bolts typically require a 27mm spanner or socket.
Verify that the pitch of the receiving thread matches the 1.5mm fine pitch. Do not force the screw as this will damage the threads.
Ensure that the mating nut or threaded hole is also high-tensile and rated for the load; if the female thread is soft, it may have stripped.
For optimal performance, always ensure that the receiving thread is clean, free of debris, and matches the 1.5mm pitch of these M18 screws. Using incompatible threads will lead to immediate damage to both the screw and the hole. It is best practice to apply a light machine oil or appropriate thread lubricant during installation to ensure smooth engagement and accurate torque readings. Regularly inspect the fasteners after initial installation, particularly in high-vibration equipment, to ensure no settling has occurred. Store in a dry environment to maintain the finish and prevent surface oxidation.
