S-91290A851 M20 x 55 mm DIN 912, ISO 4762 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
- Precise Class 5g6g thread fit guarantees smooth assembly and secure fastening, minimizing play and vibration loosening.
- High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity over repeated use.
- 17mm hex drive design allows for high torque application with standard tools, facilitating quick and efficient installation.
- Fully threaded shank offers uniform clamping force along the entire length, ideal for adjustable or deep-set applications.
- Compliance with DIN 912/ISO 4762 ensures dimensional accuracy and interchangeability, simplifying procurement and replacement.
Professional Applications & Engineering Value
This M20 socket head cap screw is engineered for rigorous industrial use, where high tensile strength and durability are critical. The black-oxide alloy steel construction resists rust and wear, making it suitable for machinery, automotive assemblies, and heavy equipment exposed to harsh conditions. Its coarse thread (2.5mm pitch) and Class 5g6g thread fit provide reliable engagement in metals and composites, reducing cross-threading risks. With a 17mm hex drive and standard socket head profile, it enables secure tool access in confined spaces, streamlining maintenance and reducing downtime. Ideal for precision fastening in construction, manufacturing, and aerospace, this screw delivers consistent performance under dynamic loads.
Specification Summary & Compliance
This product adheres to DIN 912 / ISO 4762 standards, ensuring precise dimensions including a 30mm head diameter, 20mm head height, and 55mm length. Thread specifications include M20x2.5mm coarse thread with Class 5g6g fit for metric applications. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmental and safety regulations. Manufactured to Class 12.9 strength with Rockwell C37 hardness, it is suitable for high-stress engineering uses.
