S-91500A309 4-40 x 1" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head 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 chemical and marine environments
- Enhanced durability and longevity from passivated surface finish that provides an extra protective oxide layer
- Reliable fastening performance with 70,000 psi tensile strength and Rockwell B80 hardness for demanding applications
- Precise flush mounting thanks to the standard 82° countersink angle and flat head design
- Easy installation and removal with Phillips No. 1 drive that prevents cam-out and ensures secure torque transfer
- Consistent thread engagement through Class 2A thread fit and fully threaded design for uniform load distribution
- Compliance with international standards including ASME B18.6.3, RoHS 3, and REACH for global industrial acceptance
Professional Applications & Engineering Value
These 4-40 UNC flat head Phillips screws in 316 stainless steel deliver exceptional value in corrosive environments where standard fasteners fail. The combination of passivated finish and marine-grade stainless steel provides superior protection against chlorides, acids, and industrial chemicals, making them ideal for marine equipment, chemical processing plants, and food processing machinery. The fully threaded design ensures maximum grip length in thin materials, while the 82° countersink angle creates a flush surface that prevents snagging and maintains aerodynamic profiles. Engineered with Class 2A thread fit, these screws offer precise tolerance control for vibration-resistant assemblies in electronic enclosures, instrumentation, and precision mechanical systems where reliability is critical.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit for consistent dimensional accuracy. Features 4-40 UNC coarse threads in right-hand direction with 1" length in inch system measurements. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance compliance for global industrial applications.
