B27081/27AZ - S.A.E. Standard Clevis Pin - 5/8 Diameter x 1-23/32 Inch Long

Buyers Products Clevis Pin is manufactured to SAE standards and available in multiple sizes to fit your application. The clevis pin is used with rods, cables, yoke ends, and other assemblies. It can be ordered with a cadmium- or zinc-plated finish in quantities to your specification.

Specifications

(0) Drill No.	29 (.136)
A	0.625
B	0.813
C	0.203
D (Min.)	1.469
E	1.719
F	1.922
Finish	Zinc Plated Clear
G	.109

Advanced Technical Overview: S.A.E. Standard Clevis Pin - 5/8 Diameter x 1-23/32 Inch Long

The Buyers Products S.A.E. Standard Clevis Pin, with its precise dimensions of 5/8 inch diameter and 1-23/32 inch length, represents a critical component in mechanical engineering and industrial applications requiring robust, reliable, and easily detachable linkages. Manufactured to rigorous SAE (Society of Automotive Engineers) standards, this clevis pin is designed for optimal performance in demanding environments, ensuring interoperability, safety, and durability across a wide spectrum of equipment and machinery.

Understanding the Clevis Pin: Design and Functionality

A clevis pin is a type of fastener used to secure two parts of an assembly, typically in a shear loading configuration, while allowing for rotational movement between the joined components. It typically consists of a cylindrical shaft, a head at one end, and a cross-drilled hole near the other end for the insertion of a retaining element such as a cotter pin or hairpin clip. The design intrinsically allows for the creation of a flexible, pivotable joint, which is invaluable in applications where movement is necessary but lateral displacement must be prevented.

The fundamental principle behind a clevis pin's operation is its ability to transmit shear forces efficiently. Unlike a bolt, which is often tightened to create a compressive preload and resist both shear and tension, a clevis pin is primarily designed to resist forces acting perpendicular to its axis (shear forces). This makes it ideal for connecting rods, cables, yoke ends, and various other assemblies found in agricultural, construction, automotive, and marine sectors. Its inherent simplicity also facilitates quick assembly and disassembly, a significant advantage in maintenance or reconfiguration scenarios.

Adherence to S.A.E. Standards: Ensuring Quality and Compatibility

The designation "S.A.E. Standard" is not merely a label; it signifies adherence to a comprehensive set of engineering and manufacturing guidelines established by the Society of Automotive Engineers. SAE International is a global association of engineers and technical experts in the aerospace, automotive, and commercial vehicle industries. Their standards are developed through a consensus-based process, incorporating the latest engineering practices and technological advancements. For fasteners like clevis pins, SAE standards typically govern critical aspects such as dimensional tolerances, material composition, mechanical properties (e.g., tensile strength, shear strength, hardness), surface finish requirements, and testing procedures. Adhering to these standards ensures several key benefits:

• **Interchangeability:** Components manufactured to SAE standards can be reliably interchanged with parts from different manufacturers that also comply with the same standards, simplifying replacement and maintenance.
• **Performance Consistency:** Strict control over material and manufacturing processes ensures that each pin consistently meets specified mechanical properties, guaranteeing predictable performance under various load conditions.
• **Safety:** By conforming to established safety parameters and performance benchmarks, SAE standard pins contribute to the overall safety and reliability of the machinery they are integrated into.
• **Quality Assurance:** The rigorous specifications inherent in SAE standards provide a benchmark for quality control, minimizing manufacturing defects and ensuring product integrity.

For this specific S.A.E. Standard Clevis Pin, compliance means that its physical dimensions, material strength, and finish quality are meticulously controlled to meet or exceed the performance expectations for its intended applications. This commitment to standards provides engineers, manufacturers, and end-users with confidence in the product's reliability and suitability for critical connections.

Material Science and Manufacturing Precision

The core performance of a clevis pin hinges on its material properties and manufacturing quality. While the specific alloy for this pin is not explicitly stated, the availability of zinc and cadmium plating options strongly suggests a high-grade steel as the base material. Common choices include low-carbon steels (e.g., SAE 1018, 1020) for general-purpose applications where good machinability and formability are desired, or medium-carbon alloy steels (e.g., SAE 4140, 8620) for enhanced strength and wear resistance, especially after heat treatment processes like case hardening or through-hardening. The selection of steel is critical as it dictates the pin's shear strength, resistance to bending, and fatigue life.

The manufacturing process for clevis pins typically involves several stages, each requiring precision engineering:

1. **Material Selection and Preparation:** Raw steel bar stock, verified for chemical composition and mechanical properties, is cut to appropriate lengths.
2. **Cold Heading or Machining:** The pin's head is often formed through a cold heading process, which strengthens the material through work hardening and produces a robust, consistent head geometry. Alternatively, for more complex geometries or specialized materials, the pin may be machined from bar stock using CNC lathes.
3. **Shaft Formation and Sizing:** The cylindrical shaft is precision ground or turned to achieve the specified diameter (0.625 inches) with tight tolerances, crucial for proper fit within associated clevis forks and yokes.
4. **Drilling:** A precise cross-drilled hole is created near the end of the shaft. The "Drill No. 29 (.136)" specification indicates a hole diameter of 0.136 inches, perfectly sized for standard cotter pins or hairpin clips, ensuring secure retention.
5. **Heat Treatment (Optional but Recommended for High-Strength Applications):** Depending on the desired mechanical properties, the pin may undergo heat treatment processes such as carburizing (case hardening) to create a hard wear-resistant surface while maintaining a tough core, or quenching and tempering for uniform strength throughout.
6. **Surface Finishing:** The final stage involves applying a protective coating, such as zinc plating or cadmium plating, to enhance corrosion resistance and aesthetics.

This meticulous manufacturing regimen, combined with appropriate material selection, ensures that each Buyers Products clevis pin delivers exceptional dimensional accuracy, mechanical integrity, and long-term reliability.

Detailed Dimensional Analysis

The provided specifications table offers a comprehensive breakdown of the clevis pin's critical dimensions. Understanding these parameters is essential for proper application integration and performance:

• **(0) Drill No. 29 (.136):** This refers to the diameter of the cross-drilled hole for the retaining element. A diameter of 0.136 inches is precisely engineered to accommodate common cotter pins or hairpin clips, ensuring a secure and reliable lock. The precise sizing prevents excessive play while allowing for easy insertion and removal of the retaining pin.
• **A (0.625):** This is the nominal diameter of the pin's shaft, precisely 5/8 inch. This dimension is paramount for determining the compatibility with the bores of the components it is designed to connect. Strict tolerances are applied to this dimension to ensure a snug fit, minimizing wear and maximizing shear strength.
• **B (0.813):** This represents the diameter of the pin's head. The head provides a bearing surface against one side of the clevis assembly, preventing the pin from passing through completely. Its robust size ensures it can withstand forces without deforming.
• **C (0.203):** This dimension specifies the thickness or height of the pin's head. A substantial head thickness ensures adequate material to resist forces applied to the head, distributing stress effectively and preventing bending or shear at the head-to-shaft transition.
• **D (Min.) (1.469):** This critical dimension signifies the minimum usable grip length of the pin. The grip length is the distance from the underside of the pin's head to the center of the cross-drilled hole. It dictates the maximum combined thickness of the components that can be securely fastened by the pin and a retaining clip. A value of 1.469 inches means the pin can reliably secure assemblies with a combined thickness up to this measurement, ensuring the retaining pin can be properly inserted and secured.
• **E (1.719):** This denotes the overall length of the pin from the underside of the head to the very end of the pin shaft. This dimension is important for applications where clearance is a concern, or where the exposed end of the pin needs to be considered for aesthetic or protective purposes.
• **F (1.922):** This dimension likely refers to the total length of the pin, including the head. This value can be useful for inventory management, storage, or for calculating the overall space required for the pin in an assembly.
• **G (.109):** This usually refers to a chamfer or radius dimension at the tip of the pin or at the transition from the head to the shaft. A chamfered tip facilitates easier insertion into mating holes, reducing assembly time and preventing damage to the pin or the components being joined.

These precise dimensions, held to SAE standards, ensure that the Buyers Products Clevis Pin offers an exact fit, optimal performance, and robust reliability in its intended applications.

Advanced Surface Finishing Options: Zinc Plated Clear and Cadmium Plated

The long-term performance and durability of a clevis pin are significantly influenced by its surface finish, particularly its ability to resist corrosion. Buyers Products offers two primary finishing options: Zinc Plated Clear and Cadmium Plated, each with distinct advantages suited to different operational environments.

Zinc Plated Clear

The "Zinc Plated Clear" finish refers to a layer of zinc electrodeposited onto the steel substrate, followed by a clear chromate conversion coating. This is a widely adopted and cost-effective method for corrosion protection, offering several benefits:

• **Sacrificial Protection (Cathodic Protection):** Zinc acts as a sacrificial anode. In the presence of moisture and oxygen, zinc corrodes preferentially to the underlying steel, protecting the steel substrate from rust, even if the coating is scratched.
• **Moderate Corrosion Resistance:** Provides good protection against common atmospheric corrosion, making it suitable for a vast array of indoor and outdoor applications in mild to moderately corrosive environments.
• **Aesthetic Appeal:** The clear chromate finish provides a bright, silvery appearance that is often desirable for visible components.
• **Environmental Considerations:** Zinc plating is generally considered more environmentally friendly than cadmium plating, particularly in terms of waste disposal and regulatory compliance.
• **Cost-Effectiveness:** It offers an excellent balance of protection and cost, making it a popular choice for high-volume applications where extreme corrosion resistance is not paramount.

Zinc plated clevis pins are ideal for general industrial machinery, agricultural equipment, trailer components, and automotive applications where exposure to severe corrosive agents is limited.

Cadmium Plated

Cadmium plating provides an advanced level of corrosion protection and is typically specified for more demanding applications. While its use has become more regulated due to environmental concerns, its superior performance characteristics still make it indispensable in certain industries:

• **Exceptional Corrosion Resistance:** Cadmium offers superior protection against a wide range of corrosive agents, including salt spray, marine environments, and industrial pollutants. Its self-healing properties in minor scratches are also notable.
• **Lubricity:** Cadmium exhibits excellent lubricity, which reduces friction during assembly and operation. This is particularly advantageous in applications where components might seize due to galling or where smooth articulation is required.
• **Low Coefficient of Friction:** The inherent lubricity also contributes to a lower coefficient of friction, which can be beneficial in moving assemblies, reducing wear on mating parts.
• **Galvanic Compatibility:** Cadmium is galvanically compatible with aluminum alloys, making it an preferred coating for fasteners used in aircraft and marine applications where aluminum structures are prevalent, preventing galvanic corrosion.
• **Bake Out Capability:** Cadmium plating processes are typically followed by a bake-out procedure to mitigate hydrogen embrittlement, a critical consideration for high-strength steel fasteners.

Cadmium plated clevis pins are typically specified for aerospace, defense, marine, and some high-performance automotive applications where the combination of superior corrosion resistance, lubricity, and reliability in harsh conditions outweighs the higher cost and environmental regulations associated with cadmium.

The choice between zinc and cadmium plating depends entirely on the specific application's environmental conditions, required service life, and regulatory compliance. Buyers Products provides both options to ensure engineers can select the most appropriate finish for their precise needs, optimizing both performance and cost-effectiveness.

Versatile Applications Across Industries

The 5/8 inch diameter by 1-23/32 inch long S.A.E. Standard Clevis Pin is a remarkably versatile fastener, integral to numerous mechanical linkages across a broad spectrum of industries. Its design allows for pivotal connections, making it ideal for:

• **Agricultural Machinery:** Connecting implements to tractors, securing hydraulic cylinder ends, and linkages in various farm equipment such as plows, tillers, and harvesters.
• **Construction Equipment:** Used in articulation points for excavators, loaders, backhoes, bulldozers, and cranes, especially in controlling buckets, booms, and steering mechanisms.
• **Automotive and Trailer Industry:** Critical in trailer hitches, suspension components, steering linkages in heavy-duty trucks, and various pivot points in specialty vehicles.
• **Marine Applications:** In boat rigging, steering systems, anchor mechanisms, and other connections where corrosion resistance is paramount (especially with cadmium plating).
• **Material Handling:** Integral to conveyor systems, lifting equipment, forklift attachments, and pallet jacks, providing secure yet flexible connections.
• **Industrial Control Systems:** Used in linkages for valves, levers, and actuators where precise movement and quick detachment capabilities are required.
• **General Industrial Machinery:** Across a vast array of manufacturing, processing, and assembly equipment where reliable pivot points are essential.
• **Rigging and Lifting:** In conjunction with shackles and other rigging hardware, forming secure connections for lifting and pulling operations.

The ability to quickly install and remove these pins with a simple retaining clip makes them exceptionally useful for components that require frequent adjustment, inspection, or maintenance.

Installation and Maintenance Best Practices

Proper installation and routine maintenance are crucial to maximizing the service life and ensuring the safety of clevis pin assemblies. During installation, it is imperative to ensure that the grip length (Dimension D) is appropriate for the combined thickness of the components being joined. An undersized pin will leave excessive play, leading to premature wear, while an oversized pin will prevent the retaining clip from being fully engaged. The cross-drilled hole must be fully exposed to allow for proper insertion of a new cotter pin or hairpin clip of the correct size. Over-torqueing or striking the pin during installation should be avoided as it can cause deformation or material fatigue.

Regular inspection of clevis pins should be part of any maintenance schedule. Operators should look for signs of wear, bending, corrosion, or elongation of the cross-drilled hole. Any pin exhibiting significant signs of wear or damage should be replaced immediately to prevent catastrophic failure. The retaining element (cotter pin or hairpin clip) should also be inspected and replaced if it shows signs of fatigue, bending, or loss of spring tension, as its failure would directly lead to the clevis pin becoming dislodged.

Conclusion: A Foundation of Reliability

The S.A.E. Standard Clevis Pin from Buyers Products, with its 5/8 inch diameter and 1-23/32 inch length, stands as a testament to precision engineering and adherence to industry-leading standards. Its robust construction, informed by meticulous material selection and manufacturing processes, ensures exceptional shear strength and resistance to fatigue. The detailed dimensional specifications guarantee an accurate fit for critical applications, while the availability of advanced surface finishes—Zinc Plated Clear for general protection and Cadmium Plated for extreme environments—provides tailored corrosion resistance. From heavy-duty agricultural equipment to sensitive industrial controls, this clevis pin offers a reliable, versatile, and high-performance solution for creating secure, pivotal mechanical linkages. Choosing this SAE-compliant clevis pin means investing in a component that delivers consistent quality, long-term durability, and unwavering operational integrity, ultimately enhancing the safety and efficiency of any assembly it serves.