S-99154A335 4-40 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
- Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
- Precise component alignment enabled by the exact 1/8" shoulder diameter and 1/4" shoulder length with tight tolerances
- High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing applications
- Secure and durable fastening through Class 2A thread fit and coarse UNC threading that resists loosening under vibration
- Low-profile socket head design for space-constrained assemblies while providing reliable torque transmission
- Full regulatory compliance with RoHS 3 and REACH standards, ensuring safety and environmental responsibility
- Right-hand coarse threading for quick installation and removal in general industrial applications
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw delivers critical engineering value in precision assemblies where exact component positioning is paramount. The 18-8 stainless steel construction provides excellent corrosion resistance, making it ideal for machinery exposed to moisture, chemicals, or outdoor elements. The precisely machined 1/8" shoulder diameter and 1/4" shoulder length with tight tolerances ensure accurate alignment of bearings, gears, and rotating components while preventing axial movement. The Class 2A thread fit and coarse UNC threading maintain secure fastening in high-vibration environments common in industrial equipment, automotive assemblies, and electronic enclosures. The low-profile socket head design allows installation in confined spaces while providing sufficient torque capability for repeated maintenance cycles.
Specification Summary & Compliance
This precision shoulder screw features Class 2A thread fit per UNC standards with right-hand coarse threading (4-40 UNC). Critical dimensions include shoulder diameter of 1/8" (-0.001" to 0" tolerance) and shoulder length of 1/4" (0" to 0.002" tolerance). Manufactured from 18-8 stainless steel with Rockwell B55 hardness and 70,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
