S-91253A239 10-24 x 5/16" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Alloy Steel Hex Drive Flat Head Screws

0309FA00178 Alloy Steel Hex Drive Flat Head Screws
0309FA00178 Alloy Steel Hex Drive Flat Head Screws

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Part No.
Part No. 0309FA00178
Equivalent to mcmaster :
91253A239

Basic Information

System of Measurement Inch

Head Parameters

Head Type Flat
Head Diameter 0.411"
Head Height 0.127"
Flat Head Profile Standard

Dimensions

Length 5/16"

Thread Parameters

Thread Type UNC
Thread Size 10-24
Thread Diameter 0.19"
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 3A
Threading Fully Threaded

Tip & Drive Parameters

Drive Style Hex
Drive Size 1/8"
Countersink Angle 82°

Material & Strength

Material Black-Oxide Alloy Steel
Hardness Rockwell C39
Tensile Strength 130000 psi

Temperature & Environment

REACH Compliant
RoHS Compliant
Specifications Met ASTM F835
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 tensile strength of 130,000 psi provides reliable performance in high-stress applications, reducing the risk of fastener failure.
  • Black-oxide coating on alloy steel enhances corrosion resistance and durability, extending service life in harsh industrial environments.
  • Class 3A thread fit with UNC coarse spacing ensures precise, secure fastening and easy installation, minimizing assembly time and errors.
  • Fully threaded design offers consistent grip along the entire length, improving load distribution and joint integrity.
  • Hex drive and flat head allow for high-torque application and flush mounting, ideal for space-constrained and aesthetic applications.
  • Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety, supporting responsible sourcing.
  • Rockwell C39 hardness provides excellent wear resistance, maintaining thread integrity through repeated use and vibrations.

Professional Applications & Engineering Value

These 10-24 UNC flat head screws are engineered from black-oxide alloy steel to address common industrial challenges such as vibration loosening and corrosion. The fully threaded coarse spacing and Class 3A fit deliver superior clamping force and alignment in machinery, automotive, and electronics assemblies, reducing maintenance needs. The hex drive enables efficient installation with standard tools, while the flat head profile ensures a smooth surface finish. Ideal for heavy-duty applications, these screws offer long-term reliability and compliance with stringent regulations, making them a smart choice for engineers seeking durable, precision fasteners.

Specification Summary & Compliance

This product features a 10-24 UNC thread with coarse spacing and Class 3A fit for high precision. It meets ASTM F835 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring environmental safety and industry-standard performance.

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