S-97345A209 1/4"-20 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
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh or chemical-exposed environments.
- High tensile strength of 70,000 psi ensures reliable load-bearing capacity and reduces risk of fastener failure.
- Precision Class 3A thread fit provides tight tolerances for secure, vibration-resistant assemblies.
- Knurled socket head with 5/32" hex drive offers enhanced grip and easy installation in confined spaces.
- Consistent shoulder diameter and length maintains accurate alignment for rotating parts and pivoting mechanisms.
- Compliance with ASME B18.3 and environmental standards guarantees quality, safety, and regulatory adherence.
- Coarse UNC threads enable quick assembly and disassembly, saving time in maintenance and production.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment, corrosion, and mechanical stress. The 1/4"-20 UNC coarse thread with Class 3A fit ensures precise engagement and resistance to loosening under vibration, making it ideal for machinery, automotive, and aerospace applications. The 5/16" shoulder diameter and 1 5/8" shoulder length provide a stable pivot point for gears, bearings, and linkages, reducing wear and extending component life. With its high tensile and shear strength, this fastener supports heavy-duty operations while the knurled socket head allows for secure tool engagement in tight spaces, enhancing assembly efficiency and reliability in demanding environments.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high precision and a shoulder diameter tolerance of -0.004" to -0.002". It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and material integrity. The UNC coarse thread and standard shoulder fit provide consistent performance, backed by a hardness of Rockwell B79 and verified tensile and shear strengths.
