S-97646A250 1/4"-20 x 5/8" 18-8 Stainless Steel Serrated-Flange Hex Head Screws

18-8 Stainless Steel Serrated-Flange Hex Head Screws

0279FA00032 18-8 Stainless Steel Serrated-Flange Hex Head Screws
0279FA00032 18-8 Stainless Steel Serrated-Flange Hex Head Screws

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

Part No.
Part No. 0279FA00032
Equivalent to mcmaster :
97646A250

Basic Information

Screw Features Flanged
System of Measurement Inch

Head Parameters

Head Type Hex
Head Width 3/8"
Head Height 9/32"

Dimensions

Length 5/8"
Flange Diameter 9/16"

Thread Parameters

Thread Type UNC
Thread Size 1/4"-20
Thread Diameter 0.25"
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

  • Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh industrial environments
  • Enhanced load distribution through the integrated flange design, reducing surface pressure and preventing material damage
  • High tensile strength of 100,000 psi ensures reliable fastening under heavy mechanical stress and vibration
  • Quick installation and removal with external hex drive and coarse UNC threading, saving valuable assembly time
  • Precise thread engagement with Class 2A fit for consistent performance and reduced cross-threading risks
  • Full threading along the 5/8" length provides maximum grip and adjustment flexibility in various material thicknesses
  • Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market acceptance

Professional Applications & Engineering Value

This 18-8 stainless steel hex head screw with integrated flange addresses critical engineering challenges in industrial assembly. The UNC coarse threading and external hex drive enable rapid installation in time-sensitive production environments, while the flange design significantly improves load distribution across softer materials. The fully threaded construction ensures maximum holding power in applications ranging from machinery frames to electrical enclosures. With Rockwell B100 hardness and excellent corrosion resistance, this fastener maintains integrity in demanding conditions including outdoor installations and chemical processing equipment, reducing maintenance frequency and total cost of ownership.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent performance. Features 1/4"-20 UNC coarse threading with right-hand direction and full threading along the 5/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.

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