S-91273A605 5/16"-18 Shoulder Screws
Shoulder Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life
- Enhanced wear resistance and reduced light reflection thanks to the durable black oxide finish
- Superior clamping force and joint integrity delivered by a high 70,000 psi tensile strength and 35,000 psi shear strength
- Reliable, slop-free pivoting and alignment ensured by the precision-ground 2-1/2" shoulder with tight diameter tolerance
- Secure, non-slip installation facilitated by the knurled head and hex socket drive for high-torque applications
- Consistent and reliable thread engagement with Class 2A thread fit for 5/16"-18 UNC coarse threads
- Compliance with major environmental regulations, being RoHS 3 and REACH compliant for global market acceptance
Professional Applications & Engineering Value
This high-strength shoulder screw is engineered to solve critical alignment and pivot point challenges in demanding assemblies. The 18-8 stainless steel core provides excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive, and outdoor equipment exposed to moisture and chemicals. The precision 2-1/2" shoulder length acts as a built-in dowel, accurately locating parts and bearing rotational loads without thread wear, eliminating the need for separate spacers or bushings. Combined with the black oxide finish, it offers a low-glare surface that reduces galling. The knurled socket head and hex drive ensure the fastener remains secure during high-torque installation, preventing cam-out and head stripping in critical industrial applications.
Specification Summary & Compliance
This shoulder screw conforms to UNC coarse thread standards with a Class 2A thread fit for consistent assembly. The shoulder diameter is held to a tight tolerance of -0.004" to -0.002", and the shoulder length tolerance is -0.005" to 0.005" for precise positioning. It is manufactured from 18-8 Stainless Steel with a Rockwell B55 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.
