S-97768A141 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
- Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
- Enhanced durability and wear resistance from the black oxide finish, reducing maintenance needs
- Superior load-bearing capability with 70,000 psi tensile strength and 35,000 psi shear strength for heavy-duty applications
- Precise alignment and secure positioning ensured by the Class 3A thread fit and standard shoulder fit
- Easy installation and removal with the hex drive design and knurled head for improved grip
- Reliable performance in mechanical assemblies due to the coarse UNC thread and right-hand thread direction
- Compliance with environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, extending service life in demanding conditions like manufacturing and automation. The black oxide finish not only enhances aesthetics but also adds a protective layer against abrasion. With a 1/8" shoulder diameter and 3/4" shoulder length, it offers precise shaft alignment in bearings, pulleys, and linkages, reducing wear and vibration. The Class 3A thread fit and coarse UNC threads ensure tight, reliable fastening, minimizing the risk of loosening under dynamic loads. Ideal for applications in robotics, automotive systems, and electronics, this screw delivers consistent performance where accuracy and strength are paramount.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision. Dimensions include a shoulder diameter of 1/8" (tolerance: -0.004" to -0.002") and shoulder length of 3/4" (tolerance: -0.005" to 0.005"), ensuring exacting manufacturing specifications. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmentally responsible procurement. The hardness is rated at Rockwell B55, confirming durability under stress.
