S-93516A136 5/16"-24 x 3/4" ASME B18.2.1 Bronze Hex Head Screws

Bronze Hex Head Screws

0255FA00018 Bronze Hex Head Screws
0255FA00018 Bronze Hex Head Screws

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

Part No.
Part No. 0255FA00018
Equivalent to mcmaster :
93516A136

Basic Information

System of Measurement Inch

Head Parameters

Head Type Hex
Head Width 1/2"
Head Height 13/64"

Dimensions

Length 3/4"

Thread Parameters

Thread Type UNF
Thread Size 5/16"-24
Thread Diameter 0.3125"
Thread Spacing Fine
Thread Direction Right Hand
Thread Fit Class 2A
Threading Fully Threaded

Tip & Drive Parameters

Drive Style External Hex

Material & Strength

Material 651 Silicon Bronze
Hardness Rockwell B70
Tensile Strength 70000 psi

Temperature & Environment

REACH Compliant
RoHS Compliant
Specifications Met ASME B18.2.1
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 in marine and harsh environments thanks to 651 Silicon Bronze material composition
  • Superior tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
  • Fine UNF thread design provides enhanced holding power and superior resistance to loosening
  • Precision Class 2A thread fit guarantees consistent installation and optimal engagement with mating components
  • External hex drive design enables high-torque installation with standard tools for efficient assembly
  • Full threading along the entire 3/4" length offers maximum fastening flexibility and adjustment capability
  • Rockwell B70 hardness rating ensures excellent durability and resistance to wear in demanding applications

Professional Applications & Engineering Value

Engineered for marine environments and corrosive industrial settings, these 651 Silicon Bronze hex head screws solve critical challenges where standard steel fasteners fail. The UNF fine thread configuration (5/16"-24) delivers superior vibration resistance and clamping force distribution, making them ideal for marine hardware, chemical processing equipment, and coastal infrastructure. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures long-term structural integrity while the external hex drive facilitates quick installation with standard tools. These fully threaded screws maintain consistent performance in saltwater exposure, high-humidity conditions, and chemical-rich atmospheres where corrosion resistance is paramount.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 dimensional standards with Class 2A thread fit tolerance for precision assembly. Features 5/16"-24 UNF fine threads with right-hand orientation and fully threaded 3/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries and international markets.

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