Product Description
Precision spring-type roll pin E-4039 engineered from SAE 1074 high-carbon steel, used in electric lift truck pivot assemblies. Pin dimensions are 1.18" length x 0.20" diameter with ±0.002" tolerance
Specifications
Material & Construction
| Material Specification | High-carbon steel per ASTM A684 |
| Steel Grade | SAE 1074 spring steel |
| Hardness | Rockwell C44-C50 |
| Finish | Plain, untreated |
Part Numbers
| Manufacturer Part Number | E-4039 |
Performance Specifications
| Service Factor | 1.25 (intermittent shock loading) |
Frequently Asked Questions
Q: What is the E-4039 roll pin used for in electric lift trucks?
A: The E-4039 is a precision spring-type roll pin that secures pivot assemblies, linkage connections, and load wheel attachments in electric lift truck masts and carriages. The SAE 1074 high-carbon steel provides shear strength for intermittent shock loads.
Q: What are the exact dimensions of the E-4039 pin?
A: The E-4039 is 1.18 inches in length by 0.20 inches in diameter, with a plus or minus 0.002 inch tolerance. These dimensions are critical for hole alignment and press-fit accuracy in pivot assemblies.
Q: What hardness specification does the E-4039 meet?
A: The E-4039 is hardened to Rockwell C44 to C50, providing shear resistance and resistance to deformation under intermittent shock loading. The hardness rating corresponds to ASTM A684 high-carbon steel specifications.
Q: What is the service factor for the E-4039 pin under load?
A: The E-4039 is rated with a service factor of 1.25 for intermittent shock loading. This rating means the pin can safely handle sudden load spikes and directional changes typical in lift truck pivot mechanics.
Q: Is the E-4039 available with a protective coating or finish?
A: The E-4039 comes with a plain, untreated finish. The material requires a dry environment to prevent surface corrosion. For wet or salt-exposure applications, coat the pin with light oil or request a zinc-plated variant.
Q: What happens if the E-4039 fails or shears in service?
A: A failed E-4039 pin will cause immediate loss of pivot assembly integrity, resulting in mast misalignment, uneven load distribution, and potential mast collapse. Replace the pin immediately upon failure to restore safe equipment operation.
