Shoulder eye bolts are forged lifting components with an integral collar below the eye, providing anchor points for rigging, lifting slings, and securement in industrial applications. They attach suspension insulators, clevises, and hardware to poles and crossarms in transmission and distribution line work, and serve as lifting points on machinery, molds, pumps, and deck hardware across oilfield, manufacturing, marine, and warehousing environments.
The shoulder enables angular pulls, unlike regular eye bolts limited to vertical loading. This collar maintains eye and shank strength under angled loads, reducing bending or deformation risk. Load capacity varies with pull angle: 0-5 degrees from center maintains 100% of the Working Load Limit (WLL), 6-15 degrees reduces it to 55%, and 16-90 degrees allows only 25%. Common sizes like 3/8″ diameter have a WLL of 1550 pounds for in-line pulls.
Drop forged carbon steel construction is heat treated, quenched, and tempered for strength and toughness. Hot-dip galvanizing provides corrosion resistance for outdoor conditions, while Type 316 stainless steel offers superior resistance in marine and chemical environments. Available diameters range from 1/4″ to 2″ with UNC (Unified National Coarse) threads, and lengths extend from 3 to over 20 inches.
Installation requires the shoulder to bear firmly against the mating surface, with the threaded shank protruding for full nut engagement. The eye must align with the sling direction to avoid side loading. Regular safety inspections should check for thread wear, corrosion, deformation, and cracks before each use.
Premier Shoulder Eye bolt Manufacturer
RaxPower, established in 2003 and located in Hebei Province, China, is a leading manufacturer with 21 years of experience in pole line hardware. We are offering different options to give users the flexibility to choose lifting points based on the weight of the equipment being handled.
Our Shoulder Eye bolts are forged using advanced hot forging technology for greater strength and accurate sizing, featuring an integral collar that provides a broad bearing surface to resist elongation and ensure stability. Each eyebolt is made from Type 316 non-magnetic stainless steel for superior corrosion resistance and durability, making it ideal for marine and industrial applications.
With over 170 employees and strict quality control, including multi-stage testing and load tests, we ensure that every product meets high safety standards.
Our philosophy emphasizes safety and proper usage, providing cause-and-effect explanations on how the shoulder features enhance stability for angular loading and recommending choices based on load types.
These eye bolts are widely used in various industries for repeated lifting tasks, including:
- oilfield services
- manufacturing
- marine equipment
To learn more about the heavy duty eye bolts we have for sale, browse our online catalog above! If you are unsure what product may work best for your specific job, feel free to contact us.
| Shank Diameter (in) | Working Load Limit (lbs) | Material | Finish | Thread Type |
|---|---|---|---|---|
| 1/4″ | 500 | Drop forged carbon steel | Hot-dip galvanized | UNC |
| 3/8″ | 1550 | Drop forged carbon steel | Hot-dip galvanized | UNC |
| 1/2″ | 2400 | Drop forged carbon steel | Hot-dip galvanized | UNC |
| 5/8″ | 4000 | Drop forged carbon steel | Hot-dip galvanized | UNC |
| 3/4″ | 5000 | Drop forged carbon steel | Hot-dip galvanized | UNC |
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Frequently Asked Questions (FAQS)
What are shoulder eye bolts used for?
Shoulder eye bolts are widely used in transmission and distribution line work, as anchor points for loads and lifting slings in rigging industries. They are suitable for straight line or angular pulling in applications such as machinery, equipment lifting, and permanent installations.
What materials and finishes are available for shoulder eye bolts?
Shoulder eye bolts are typically made from drop forged steel, heat treated carbon steel, or stainless steel for corrosion resistance. Our products are forged from high-quality carbon steel and heat-treated to enhance strength and toughness. Finishes include mill, galvanized, zinc plated, or self-colored, with hot dip galvanizing offering weather protection and corrosion resistance for longevity in harsh environments.
How do your shoulder eye bolts meet international standards and ensure long-term durability?
Our shoulder eye bolts are designed to exceed industry standards such as CSA C83 for Charpy impact levels and are RUS listed for utility applications. They undergo rigorous load testing to verify minimum breaking strength and gauge testing in accordance with IEC standards. Third-party inspections, including SGS tests, confirm full compliance. The shouldered design provides stability for angular pulls, maintaining integrity in demanding applications, backed by strict quality control processes from raw material selection to final inspection.
Can shoulder eye bolts be used for angular loading, and how does it affect capacity?
Yes, shouldered eye bolts are the preferred choice for angular pulls. The shoulder design helps maintain the strength of the eye and shank, but loading at an angle significantly reduces the bolt's rated capacity. Angles from 0-5 degrees from center are rated at 100% of capacity, 6-15 degrees at 55%, 16-30 degrees at 60%, 45 degrees at 33%, and 90 degrees at 20-25%.
What is the working load limit for shoulder eye bolts?
The working load limit varies by size and strength; for example, 3/4 inch sizes can have minimum breaking strengths up to 30000 lbs, with working loads from 1550 lbs to higher capacities. Always refer to manufacturer specifications, such as those from RaxPower, for accurate ratings.
How should shoulder eye bolts be properly installed?
The threaded part must protrude through the load for full engagement of the nut. The shoulder must bear firmly against the mating part; use washers or shims if needed for proper seating. Always inspect threads and receiving holes for cleanliness, and ensure the bolt is tightened firmly and oriented in line with the slings. Many shoulder eye bolts come with one hex nut, and some include washers.
Can you handle large-volume orders and guarantee on-time delivery?
With extensive production facilities and automated processes, we efficiently manage bulk orders and maintain sufficient stock levels. Our warehousing and logistics systems ensure timely shipment, typically within a few business days for in-stock items, prioritizing on-time delivery to meet tight project schedules.
How do you maintain competitive pricing while delivering high-quality products?
By leveraging automated manufacturing and economies of scale, we achieve cost-effective production without sacrificing quality. Our multi-stage quality control ensures consistent performance and reliability, allowing us to offer competitive pricing while upholding the stringent standards demanded by various industries.
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