S-90604A553 4-40 x 3/8" ASME B18.6.3 Stainless Steel Pan Head Combination Phillips/Slotted Screws
Stainless Steel Pan Head Combination Phillips/Slotted 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 thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh environments.
- High tensile strength of 100,000 psi ensures reliable, long-lasting fastening under demanding loads.
- Excellent thread engagement with UNC coarse threading and Class 2A fit for quick assembly and vibration resistance.
- Dual-drive convenience with Phillips/Slotted No. 1 drive for flexible tool use and reduced cam-out.
- Full threading along the 3/8" length provides maximum grip and adjustability in various material thicknesses.
- Consistent performance backed by Rockwell B100 hardness for durability and wear resistance.
- Compliance with major standards including ASME B18.6.3, RoHS 3, and REACH for safe, quality-assured use.
Professional Applications & Engineering Value
These 4-40 UNC rounded head screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The 18-8 stainless steel material combined with a passivated finish provides exceptional resistance to rust and chemicals, making them suitable for applications in electronics, machinery, and outdoor equipment where moisture exposure is a concern. The coarse UNC thread and Class 2A thread fit ensure easy starts and secure fastening, reducing the risk of cross-threading in high-volume production lines. With a fully threaded design and pan head style, these screws offer uniform clamping force and a low-profile finish, ideal for compact assemblies requiring reliable, repetitive fastening without compromising on strength or compliance.
Specification Summary & Compliance
This product features precise Class 2A thread fit and adheres to UNC coarse thread standards with a size of 4-40. Manufacturing follows ASME B18.6.3 specifications for dimensional accuracy and performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets.
