S-93425A214 3/8"-16 Hex Nuts

Hex Nuts

0878FA00021 Hex Nuts
0878FA00021 Hex Nuts

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

Part No.
Part No. 0878FA00021
Equivalent to mcmaster :
93425A214

Basic Information

System of Measurement Inch
Nut Type Hex

Dimension Parameters

Width 9/16"
Height 21/64"

Thread Parameters

Thread Type UNC
Thread Size 3/8"-16
Thread Direction Left Hand
Thread Spacing Coarse
Thread Fit Class 2B

Head Parameters

Drive Style External Hex
Hex Nut Profile Standard

Material & Strength Parameters

Material Zinc-Plated Steel
Fastener Strength Grade/Class Grade 2

Finish & Compliance Parameters

RoHS RoHS 3 (2015/863/EU) Compliant
REACH REACH (EC 1907/2006) (06/10/2022, 224 SVHC) 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: Zinc-plated steel construction provides excellent protection against rust and environmental degradation, extending service life in demanding conditions.
  • High-Strength Fastening: Meets Grade 2 strength requirements, ensuring reliable performance and load-bearing capacity for general industrial applications.
  • Precision Thread Engagement: Class 2B thread fit offers consistent, reliable mating with male threads, reducing the risk of cross-threading and assembly issues.
  • Left-Hand Thread Security: Designed for applications where standard right-hand rotation would loosen the fastener, providing a secure connection in specialized machinery.
  • Easy Installation & Removal: Standard external hex drive and coarse UNC thread allow for quick assembly and disassembly with common tools, saving valuable maintenance time.
  • Regulatory Compliance: Conforms to RoHS 3 and REACH environmental standards, making it suitable for use in regulated markets and eco-conscious projects.
  • Wide Compatibility: 3/8"-16 UNC coarse thread is a common industrial standard, ensuring easy sourcing and replacement in existing assemblies.

Professional Applications & Engineering Value

This left-hand thread hex nut is engineered to solve critical fastening challenges in dynamic or reverse-rotation environments. The zinc-plated steel material provides a durable barrier against corrosion, which is essential for outdoor equipment, automotive components, and machinery exposed to moisture. The coarse UNC thread and Class 2B fit ensure rapid assembly with reduced risk of stripping, making it ideal for high-vibration applications like conveyor systems, agricultural machinery, and rotating shafts where standard right-hand nuts may loosen. Its external hex drive design offers excellent torque transmission, allowing for secure tightening with standard wrenches. By specifying this nut, engineers achieve reliable left-hand fastening that maintains integrity under stress, minimizing downtime and maintenance costs in industrial settings.

Specification Summary & Compliance

This hex nut features a 3/8"-16 UNC coarse thread with a Class 2B thread fit, ensuring dimensional accuracy and compatibility with standard male threads. Manufactured from zinc-plated steel, it meets Grade 2 mechanical properties for general-purpose use. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to strict environmental and safety standards for hazardous substances.

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