S-91264A553 1/4"-20 ASME B18.3, ASTM A574 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 with permanent nylon pellet thread locker maintains secure fastening in temperatures from -50° to 250°F
- Exceptional mechanical strength delivers 140,000 psi tensile strength and 84,000 psi shear strength for heavy-duty applications
- Precision shoulder alignment with 2" length and tight diameter tolerances ensures accurate component positioning
- Superior corrosion protection through black oxide finish extends service life in demanding industrial environments
- Reliable thread engagement with Class 3A UNC coarse threads provides consistent, high-quality fastening performance
- Enhanced grip and torque transmission from knurled socket head with 5/32" hex drive prevents tool slippage
- Hardened alloy steel construction at Rockwell C32 hardness ensures long-term durability and wear resistance
Professional Applications & Engineering Value
This alloy steel shoulder screw with black oxide finish addresses critical alignment and vibration challenges in precision machinery. The 2" shoulder length with controlled tolerances provides exact component spacing in assemblies, while the permanent nylon locking system prevents loosening under continuous vibration in automotive, aerospace, and industrial equipment. The UNC coarse threads with Class 3A fit ensure rapid assembly and disassembly without compromising joint integrity. Engineered for high-strength applications requiring reliable positioning and vibration resistance, this socket head shoulder screw delivers consistent performance in rotating mechanisms, pivoting joints, and precision guiding systems where dimensional stability is paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision engagement. The shoulder features diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for exact alignment requirements. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Material certification to ASTM A574 ensures consistent quality and performance in industrial fastening applications.
