S-91257A695 7/16"-14 x 8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and reliability with Grade 8 classification, supporting heavy-duty applications and reducing failure risks under high stress.
• Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh industrial environments.
• High tensile strength of 150,000 psi ensures dependable performance in demanding mechanical assemblies.
• Optimized clamping force due to the partially threaded design, providing secure fastening without unnecessary thread engagement.
• Easy installation and removal with external hex drive and coarse UNC threads, saving time and labor in maintenance.
• Precise thread fit (Class 2A) guarantees consistent engagement and reduces the risk of cross-threading or loosening.
• Compliance with ASME B18.2.1 and SAE J429 standards ensures quality, interchangeability, and adherence to industry best practices.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where high tensile strength and durability are paramount. The steel material combined with Rockwell C33 hardness resists deformation under load, while the zinc yellow-chromate plating provides a robust barrier against rust and corrosion, even in outdoor or chemically aggressive settings. The 7/16"-14 UNC coarse thread and partial threading design enhance grip and distribute stress effectively, minimizing vibration-induced loosening. Ideal for structural frames, engine components, and industrial equipment, this fastener delivers reliable performance, reduces maintenance downtime, and supports long-term operational safety by meeting ASME B18.2.1/SAE J429 specifications.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent accuracy and UNC coarse threading with a size of 7/16"-14. It meets ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring reliability in inch-system applications. The product complies with industry regulations for quality and performance, though specific RoHS or REACH declarations should be verified per batch. With a length of 8 inches and partial threading, it is designed for optimal fastening in accordance with established engineering norms.