S-90934A921 5/8"-11 x 4" SAE J429 Plow Bolts

Plow Bolts

0858FA00034 Plow Bolts
0858FA00034 Plow Bolts

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

Part No.
Part No. 0858FA00034
Equivalent to mcmaster :
90934A921

Basic Information

System of Measurement Inch
Plow Bolt Trade Number No. 3
Specifications Met SAE J429

Head Parameters

Head Type Oval
Head Diameter 1.044"
Head Height 0.616"
Oval Head Profile Standard
Oval Top Height 0.1"

Neck & Shank Parameters

Neck Type Square
Neck Width 0.64"

Dimension Parameters

Length 4"
Screw Diameter 0.625"
Countersink Angle 82°

Thread Parameters

Thread Type UNC
Thread Size 5/8"-11
Threading Partially Threaded
Thread Direction Right Hand
Thread Spacing Coarse
Thread Fit Class 2A
Min Thread Length 1 1/2"

Material & Strength Parameters

Material Zinc Yellow-Chromate Plated Steel
Fastener Strength Grade/Class Grade 8
Hardness Rockwell C33
Tensile Strength 150000 psi
Technical Drawings No drawings available at the moment, will be launched soon
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Key Features & Benefits at a Glance

  • Exceptional Strength for Demanding Applications – Grade 8 classification and 150,000 psi tensile strength ensure reliable performance under extreme loads and stress.
  • Superior Corrosion Resistance – The zinc yellow-chromate plating on steel provides a durable barrier against rust, extending service life in harsh environments.
  • Secure Anti-Rotation Locking – The integrated square neck design prevents the bolt from spinning during installation, ensuring a stable and secure fit.
  • Optimized for Heavy-Duty Use – The Rockwell C33 hardness and coarse UNC threading offer excellent durability and easier engagement in tough materials.
  • Engineered for Easy InstallationPartially threaded design and oval head with standard profile allow for efficient assembly and a finished appearance.
  • Guaranteed Compliance & Reliability – Manufactured to meet SAE J429 specifications, ensuring consistent quality and performance for industrial and agricultural equipment.

Professional Applications & Engineering Value

This Grade 8 plow bolt is engineered to solve critical challenges in heavy-duty applications, particularly in agriculture and construction. The zinc yellow-chromate plated steel construction combats corrosion from moisture and chemicals, significantly reducing maintenance and replacement costs. The square neck is a key feature that locks the bolt securely in place, preventing rotation during vibration-heavy operations—a common pain point in machinery like snow plows, tillage equipment, and industrial graders. Combined with its high tensile strength and UNC coarse threads, this bolt delivers reliable fastening in high-stress environments, ensuring equipment integrity and minimizing downtime. It is an ideal replacement plow bolt for OEM parts, offering enhanced durability and compliance with industry standards.

Specification Summary & Compliance

This plow bolt features a 5/8"-11 UNC thread with a Class 2A fit for consistent assembly. It is manufactured from high-strength steel with a Rockwell C33 hardness and meets the SAE J429 specification for Grade 8 fasteners. The product complies with RoHS and REACH environmental regulations, ensuring it is safe for use in various industrial and agricultural sectors.

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