S-91249A101 4-40 x 1/8" 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
- Exceptional corrosion resistance with black-oxide coated 18-8 stainless steel, ideal for harsh industrial environments
- Superior tensile strength of 70,000 psi ensures reliable performance under high-stress applications
- Rockwell B70 hardness provides excellent wear resistance and durability for long service life
- Fully threaded design delivers maximum holding power and consistent engagement across the entire length
- Class 2A thread fit with UNC coarse threads enables quick assembly and secure fastening
- Phillips No. 1 drive offers efficient installation with common tools while reducing cam-out risk
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH ensures regulatory acceptance
Professional Applications & Engineering Value
These 4-40 UNC coarse thread screws with black-oxide 18-8 stainless steel construction address critical industrial fastening challenges where corrosion resistance and mechanical strength are paramount. The combination of 70,000 psi tensile strength and Rockwell B70 hardness makes them ideal for machinery, electronic enclosures, and automotive components subjected to vibration and environmental exposure. The fully threaded design ensures maximum thread engagement in thin materials, while the rounded pan head with Phillips drive provides a low-profile, secure fastening solution that resists loosening. These screws deliver reliable performance in manufacturing, assembly lines, and maintenance operations where consistent thread fit and regulatory compliance are essential.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threads (4-40 size) and 1/8" length. Complies with ASME B18.6.3 manufacturing specifications, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) regulations for chemical safety. Right-hand threaded with standard pan head profile and No. 1 Phillips drive size.
