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The Range£16.85Visit shop Unifix Grade 10.9 Ht Fine Pitch Hexagon Setscrews M12 (1.5) X 40 - Q10961f001200040000 - Grey
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The Unifix Grade 10.9 HT Fine Pitch Hexagon Setscrews are engineered for professional contractors and engineers who require high-strength fastening solutions for industrial and heavy-duty construction projects. These M20 (1.5) x 50 bolts deliver exceptional grip and structural integrity due to their high-tensile steel construction and precise fine-pitch threading. While they offer superior stability in demanding environments, users should note that the specific fine-pitch requirement demands matching compatible nuts or tapped holes to ensure proper thread engagement.
| Colour | Black |
|---|---|
| Model Part Number | 5014196378329 |
| Brand | Unifix |
Grade 10.9 indicates the tensile strength of the steel. It signifies that the screw has a nominal tensile strength of 1000 MPa and a yield strength of 900 MPa, making it suitable for high-stress applications.
No, these are fine pitch (1.5mm) screws. They must be used with M20x1.5 fine pitch nuts.
DIN 961 specifies the requirements for hexagon head bolts with metric fine pitch threads and a full thread length.
They feature a black industrial finish which offers some corrosion resistance, but they are not rust-proof. If used in high-moisture environments, additional protective coatings or regular maintenance may be required.
As this is a setscrew (often synonymous with a bolt fully threaded to the head), the thread typically runs the full length of the 50mm shaft.
Verify that the hole is tapped specifically for an M20x1.5 thread. Fine pitch threads are not interchangeable with standard M20 coarse pitch threads.
Stop immediately; this is a sign of cross-threading. Back the screw out, inspect the threads for damage, and restart carefully by rotating counter-clockwise until you feel the threads align.
Ensure the required torque has been met. If vibration persists, consider using a thread-locking compound designed for high-strength steel applications.
For proper installation, verify that your mating components have a compatible fine-pitch M20x1.5 thread profile. It is recommended to clean the threads of both the setscrew and the hole before installation to remove any grit or debris. Use a calibrated torque wrench to achieve the specific tightening requirements for your project, as over-torquing can lead to fatigue in the steel. Keep these fasteners in a dry environment to prevent surface corrosion, although the black finish provides baseline protection. Do not use these screws in applications where the diameter or pitch does not match, as this will lead to thread stripping and potential failure of the connection.
