S-93712A100 5/16"-24 x 2" Partially Threaded Studs with Cotter Pin

Partially Threaded Studs with Cotter Pin

1438FA00001 Partially Threaded Studs with Cotter Pin
1438FA00001 Partially Threaded Studs with Cotter Pin

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

Part No.
Part No. 1438FA00001
Equivalent to mcmaster :
93712A100

Basic Information

System of Measurement Inch
RoHS RoHS 3 (2015/863/EU) Compliant
REACH REACH (EC 1907/2006) (01/17/2023, 233 SVHC) Compliant

Dimension Parameters

Length 2"
Shaft Length 1"
Usable Length 1.4"

Thread Parameters

Threading Threaded on One End
Thread Size 5/16"-24
Thread Direction Right Hand
Thread Type UNF
Thread Spacing Fine
Thread Fit (External) Class 2A
Thread Length 1"

Material & Strength Parameters

Material 18-8 Stainless Steel
Hardness Rockwell B89

Shaft Parameters

Shaft Diameter 5/16"
Shaft Diameter Tolerance -0.005" to 0.005"

Installation Parameters

Cotter Pin Length 2"
Cotter Pin Hole Diameter 0.141"
Cotter Pin Material 18-8 Stainless Steel
Cotter Pin Type Hairpin
Technical Drawings No drawings available at the moment, will be launched soon
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Key Features & Benefits at a Glance

  • Enhanced corrosion resistance with 18-8 stainless steel construction, ensuring longevity in harsh environments.
  • Secure locking mechanism provided by the integrated hairpin cotter pin, preventing accidental disassembly in high-vibration applications.
  • Precise thread engagement with Class 2A thread fit and UNF fine threading, offering reliable, vibration-resistant connections.
  • Optimized strength and durability from Rockwell B89 hardness, maintaining structural integrity under mechanical stress.
  • Versatile partial threading design allows for adjustable positioning while the unthreaded shaft provides shear strength.
  • Compliance with industrial safety standards including RoHS 3 and REACH, ensuring safe use in regulated sectors.
  • Right-hand thread direction for standard installation compatibility and ease of assembly in common machinery.

Professional Applications & Engineering Value

This 5/16"-24 UNF partially threaded stud with hairpin cotter pin is engineered to address critical fastening challenges in industrial settings. The 18-8 stainless steel material provides excellent corrosion resistance, making it ideal for applications exposed to moisture, chemicals, or outdoor elements. The Class 2A thread fit and UNF fine thread design ensure tight, secure connections that resist loosening under vibration—common in automotive, machinery, and aerospace assemblies. The partially threaded configuration allows the unthreaded section to bear shear loads while the threaded end facilitates adjustable mounting. Combined with the cotter pin, it delivers fail-safe retention in pivoting joints, linkage systems, and rotating components, reducing maintenance downtime and enhancing operational safety.

Specification Summary & Compliance

This stud features a 5/16"-24 UNF thread with Class 2A tolerance for precise external thread fit, a 1" thread length, and a 2" hairpin cotter pin made from 18-8 stainless steel. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial components.

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