S-92981A778 M4 ASTM A108 Shoulder Screws
Shoulder 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
- Enhanced Durability & Corrosion Resistance - Black oxide finish provides reliable protection against rust and wear in demanding industrial environments.
- High Tensile Strength for Heavy-Duty Use - 140,000 psi tensile strength ensures secure fastening under high stress and vibration.
- Precision Thread Fit for Reliable Assembly - Class 5g6g thread fit guarantees consistent engagement and reduces the risk of cross-threading.
- Secure Grip with Knurled Head Design - Knurled socket head allows for easy manual handling and prevents slipping during installation.
- Accurate Shoulder Alignment - Tight shoulder length tolerance (±0.25mm) ensures precise component positioning in assemblies.
- Wide Industrial Compatibility - Metric coarse thread (M4x0.7) and 18mm shoulder length suit various machinery and equipment applications.
- Compliance with Global Standards - Meets ASTM A108, RoHS 3, and REACH regulations for safe, sustainable use worldwide.
Professional Applications & Engineering Value
This M4 shoulder screw is engineered from alloy steel to address critical needs in precision assemblies, such as rotating shafts, pivots, and spacers in machinery and automotive systems. The black oxide finish enhances corrosion resistance, extending service life in humid or abrasive conditions. With a Class 5g6g thread fit and coarse M4x0.7 metric thread, it ensures quick, secure fastening while minimizing installation errors. The 18mm shoulder length with minimal tolerance provides stable alignment for bearings and gears, reducing wear and maintenance costs. Ideal for industrial applications requiring high strength and dimensional accuracy, this screw supports efficient production and long-term reliability.
Specification Summary & Compliance
This shoulder screw features a Class 5g6g thread fit per ISO standards, with a shoulder diameter tolerance of -0.072 to -0.01 mm and shoulder length tolerance of 0 to 0.25 mm for precise engineering. It complies with ASTM A108 material specifications, RoHS 3 (2015/863/EU), and REACH (EC 1907/2006) regulations, ensuring environmental safety and quality consistency in global supply chains.
