S-97646A252 5/16"-18 x 1/2" 18-8 Stainless Steel Serrated-Flange Hex Head Screws

18-8 Stainless Steel Serrated-Flange Hex Head Screws

0279FA00034 18-8 Stainless Steel Serrated-Flange Hex Head Screws
0279FA00034 18-8 Stainless Steel Serrated-Flange Hex Head Screws

Image may differ from product. See technical specification for details.

Part No.
Part No. 0279FA00034
Equivalent to mcmaster :
97646A252

Basic Information

Screw Features Flanged
System of Measurement Inch

Head Parameters

Head Type Hex
Head Width 1/2"
Head Height 21/64"

Dimensions

Length 1/2"
Flange Diameter 11/16"

Thread Parameters

Thread Type UNC
Thread Size 5/16"-18
Thread Diameter 0.3125"
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 2A
Threading Fully Threaded
Locking Type Serrations

Tip & Drive Parameters

Drive Style External Hex

Material & Strength

Material 18-8 Stainless Steel
Hardness Rockwell B100
Tensile Strength 100000 psi

Temperature & Environment

REACH Compliant
RoHS Compliant
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
  • Superior locking performance through serrated flange design that prevents loosening under vibration
  • High tensile strength of 100,000 psi ensures reliable performance in demanding applications
  • Easy installation and removal with external hex drive and standard UNC coarse threading
  • Precise thread fit with Class 2A tolerance for consistent engagement and reduced cross-threading risk
  • Full threading along entire length provides maximum grip and load distribution
  • Compliance with environmental regulations including RoHS 3 and REACH for global market acceptance

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw delivers exceptional engineering value through its 18-8 stainless steel composition and advanced flange design with serrations. The material's inherent corrosion resistance makes it ideal for outdoor equipment, marine applications, and chemical processing facilities where moisture and corrosive elements are concerns. The coarse UNC threading ensures quick installation and reliable performance in soft materials or applications requiring frequent disassembly. The integrated flange eliminates the need for separate washers, reducing assembly time while the serrated underside provides superior vibration resistance, making these industrial screws perfect for machinery, automotive assemblies, and structural frameworks where movement and stress are constant factors.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 5/16"-18 UNC coarse threading and full threading along the 1/2" length. Manufactured from 18-8 stainless steel with Rockwell B100 hardness and 100,000 psi tensile strength. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance for industrial and commercial applications.

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