S-98070A110 4-40 x 1/4" Sealing Stainless Steel Phillips Flat Head Screws
Sealing Stainless Steel Phillips Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
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Key Features & Benefits at a Glance
- Superior sealing reliability with integrated silicone O-ring that withstands extreme pressures up to 20000 psi
- Exceptional temperature resistance from -150° to 500°F for stable performance in harsh environments
- Enhanced corrosion protection through 18-8 stainless steel construction and passivated surface treatment
- Precise thread engagement with Class 2A UNC coarse threads ensuring consistent fastening and vibration resistance
- Optimal flush mounting with standard flat head profile and 100° countersink angle for seamless surface integration
- Reliable drive performance with Phillips No. 1 drive style providing secure installation torque control
- Full regulatory compliance meeting RoHS 3 and REACH standards for global industrial applications
Professional Applications & Engineering Value
This 4-40 UNC flat head sealing screw delivers critical pressure containment in demanding industrial environments where fluid or gas leakage would compromise system integrity. The silicone rubber O-ring maintains its sealing properties across extreme thermal cycles from cryogenic to high-temperature operations, while the 18-8 stainless steel core provides structural strength with corrosion resistance. The passivated finish enhances surface durability against chemical exposure, making these Phillips drive screws ideal for precision equipment, hydraulic systems, and processing machinery where reliable sealing under 20000 psi maximum pressure is essential for operational safety and maintenance reduction.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit standards with UNC coarse threading (4-40 size) and fully threaded 1/4" length. The flat head profile features standard dimensions with 0.225" head diameter and 100° countersink angle. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability for industrial procurement requirements.
