S-91205A671 1/4"-28 x 1 3/4" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws
Alloy Steel Thread-Locking Socket Head 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
- Vibration-resistant locking with nylon patch thread locker prevents loosening under dynamic loads and thermal cycling from -70° to 250°F
- Exceptional tensile strength of 170,000 psi withstands extreme mechanical stresses in demanding applications
- Precision Class 3A thread fit ensures superior engagement and consistent clamping force in UNF fine-thread assemblies
- Corrosion-resistant black-oxide finish on alloy steel provides durable protection in industrial environments
- Hex socket drive compatibility with standard 3/16" tools enables high-torque installation in confined spaces
- Partially threaded design offers optimal grip length control for precise joint compression
- Full regulatory compliance with ASME B18.3, ASTM A574, RoHS 3 and REACH standards guarantees quality and safety
Professional Applications & Engineering Value
These socket head cap screws deliver critical reliability in high-vibration environments where fastener integrity is paramount. The black-oxide alloy steel construction combined with Rockwell C37 hardness provides exceptional wear resistance while maintaining ductility. The nylon patch locking mechanism actively resists rotational loosening caused by machinery vibration, eliminating the need for secondary locking components. With 1/4"-28 UNF fine threads achieving Class 3A precision fit, these fasteners ensure uniform load distribution in precision equipment, automotive assemblies, and industrial machinery where 170,000 psi tensile strength is required to withstand extreme operational stresses without compromising joint integrity.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances with UNF fine thread profile meeting ASME B18.3 specifications. The partially threaded design provides 1-1/4" minimum thread engagement. Material certification complies with ASTM A574 standards for alloy steel socket head cap screws. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across global markets.
