S-94361A334 1/4"-28 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
- Exceptional tensile strength of 140,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic applications.
- Corrosion-resistant black oxide finish extends service life by protecting against rust and wear in harsh industrial environments.
- Knurled socket head with hex drive offers secure, non-slip tool engagement for easy installation and removal, even in tight spaces.
- Fine UNF thread (1/4"-28) delivers enhanced clamping force and better load distribution compared to coarse threads.
- Alloy steel construction with Rockwell C32 hardness balances durability and machinability, ideal for repeated assembly and disassembly.
- Compliant with RoHS 3 and REACH regulations ensures environmental safety and meets global industry standards for hazardous substances.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery. The alloy steel material, combined with a black oxide finish, provides excellent resistance to corrosion and mechanical stress, making it suitable for applications like precision pivots, rotating shafts, and assembly jigs. The 1/4"-28 UNF fine thread and Class 3A fit ensure tight tolerances and secure fastening, reducing backlash and improving positional accuracy. Its knurled socket head with a 5/32" hex drive allows for efficient installation in confined areas, enhancing productivity in automated systems and heavy-duty equipment where reliability is paramount.
Specification Summary & Compliance
This shoulder screw adheres to UNF thread standards with a Class 3A fit for precise thread engagement. Dimensions include a shoulder diameter of 5/16" with a tolerance of -0.004" to -0.002" and a shoulder length of 1 5/8" with a tolerance of -0.005" to 0.005", ensuring consistent alignment. It meets RoHS 3 (2015/863/EU) compliance under exemption 6(a) for lead in steel and is REACH (EC 1907/2006) compliant, confirming adherence to environmental and safety regulations for industrial use.
