S-91772A137 4-40 x 2 1/2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws
Stainless Steel Pan Head Phillips 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Optimized load distribution through the pan head design and partial threading, reducing material stress and improving joint integrity
- High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under heavy loads
- Quick and secure installation using the Phillips No. 1 drive and coarse UNC threads, minimizing assembly time and preventing cross-threading
- Precise thread engagement with Class 2A fit, ensuring consistent fastening and vibration resistance in dynamic applications
- Broad regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial use
- Durable surface protection from passivation treatment, extending service life in corrosive or high-moisture conditions
Professional Applications & Engineering Value
These 4-40 UNC partially threaded pan head screws deliver critical engineering advantages in demanding assemblies. The passivated 18-8 stainless steel provides excellent corrosion resistance, solving common failure points in outdoor, marine, or chemical-exposed equipment. The partial threading design concentrates clamping force precisely where needed, preventing thread stripping in softer materials while maintaining high tensile strength. With coarse UNC threads and Phillips drive, installation is rapid and secure, reducing labor costs in high-volume production lines. These screws are ideal for industrial fastening in machinery, electronic enclosures, and structural frameworks where vibration resistance and long-term reliability are paramount.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy and reliable engagement. Manufacturing complies with ASME B18.6.3 specifications for consistent quality and performance. The screw is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial components.
