S-91327A294 8-32 ASME B18.3 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
- Vibration-resistant locking: Permanent nylon patch thread locker prevents loosening under dynamic loads, ensuring reliable assembly integrity.
- Exceptional corrosion resistance: 18-8 stainless steel construction with passivated finish provides long-term durability in harsh environments.
- High-strength performance: 70,000 psi tensile strength and Rockwell B55 hardness withstand heavy mechanical stresses.
- Precision thread engagement: Class 3A thread fit ensures consistent, secure fastening with reduced risk of cross-threading.
- Wide temperature tolerance: Maintains locking performance across -50° to 250°F (-45° to 121°C) operating range.
- Secure hex drive installation: 3/32" hex socket enables high-torque application without cam-out risks.
- Standardized dimensions: ASME B18.3 compliance guarantees interchangeability and engineering consistency.
Professional Applications & Engineering Value
This 8-32 UNC shoulder screw delivers critical vibration resistance where conventional fasteners fail. The nylon patch thread locker creates permanent friction locking without chemical curing, making it ideal for industrial machinery, automated assembly systems, and precision equipment requiring maintained clamp load. The 18-8 stainless steel material combined with passivated finish resists chemical exposure and oxidation in manufacturing environments. The shoulder diameter provides precise component alignment while bearing rotational forces, eliminating the need for separate spacers. With Class 3A thread fit and ASME B18.3 compliance, engineers achieve reliable dimensional consistency across production runs.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision engagement. The UNC coarse thread (8-32) provides rapid assembly in most materials. Shoulder diameter tolerance maintained at -0.004" to -0.002" for precise component positioning. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use in regulated industries.
