Eye Bolts and Eye Nuts
S279 Shoulder Type Machinery Eye Bolt
A drop-forged forged steel machinery eye bolt with a shoulder design, engineered for angular loading where the shank and threads do not extend through the base material. The shoulder transfers load directly to the threads, eliminating protrusion and reducing interference with surrounding structures. Available from 1/4 inch to 1-1/2 inch in size, with a 5:1 safety factor and hot-dipped galvanized finish. Meets or exceeds ASME B30.26 requirements for identification, ductility, proof load, design factor, and temperatu
- Size
- from 1/4 " to 1-1/2"
- Material
- Forged Steel Processing: Drop Forged,Quenched and Tempered
- Finish
- Hot Dipped Galvanized
- Packing
- Cartons or Gunny Bags and then on Pallets
- Catalogue Family
- Eye Bolts and Eye Nuts
- Certificates
- EN 10204 3.1 material test certificate on request
CAD files are supplied on request via WhatsApp or email rather than published for open download.
Key Benefits
What S279 Shoulder Type Machinery Eye Bolt Gives You
- Shoulder design ensures load is transferred through threads only, eliminating shank protrusion and reducing interference with adjacent components
- 5:1 safety factor provides high margin of safety for dynamic and angular loading applications
- Drop-forged and quenched tempered steel body resists impact and fatigue under repeated loading
- Hot-dipped galvanized finish offers corrosion resistance in outdoor and harsh industrial environments
- Meets ASME B30.26 standards for proof load, ductility, identification, and temperature performance
- Compact shoulder profile allows installation in tight spaces where a standard eye bolt would interfere
- Threaded shank engages fully in the base material, maximizing holding strength in angular pull scenarios
Application Scenarios
Where S279 Shoulder Type Machinery Eye Bolt Is Used
- Mounting heavy machinery or equipment frames where angular pull forces are applied and clearance is limited
- Industrial rigging setups in construction and infrastructure where the bolt must be flush with the mounting surface
- Marine and offshore applications requiring corrosion resistance and high fatigue life under cyclic loading
- Steel fabrication and structural assembly where bolts are used in tension with angular load paths
- Cranes and hoisting systems where the eye bolt is part of a load path with side or oblique forces
- Automotive and transport equipment where space constraints require a low-profile mounting solution
- Mining and energy equipment subjected to vibration and impact where fatigue resistance is critical
Who It Is For
Buyers This Product Is Built For
- Industrial equipment manufacturers building frames and mounting points for heavy machinery
- Rigging contractors specifying angular load-rated hardware for crane and hoist systems
- Marine and offshore engineering teams requiring corrosion-resistant, fatigue-tested eye bolts
- Construction and infrastructure firms installing structural components with limited clearance
- Manufacturers of transport and logistics equipment needing compact, high-strength mounting hardware
- Maintenance and repair teams replacing worn or undersized eye bolts in dynamic systems
- Engineering firms specifying hardware that meets ASME B30.26 for compliance and safety audits
Problems It Solves
Problems This Product Removes
- Standard eye bolts with protruding shanks interfering with adjacent structures or moving parts
- Insufficient safety margin in angular loading scenarios due to lower design factors
- Corrosion damage in outdoor or wet environments from uncoated or poorly finished bolts
- Fatigue failure in cyclic loading applications due to inadequate material processing
- Lack of traceability and certification in hardware used in regulated industries
- Difficulty sourcing a single supplier for a full range of angular-rated eye bolts with consistent quality
- Inconsistent load transfer due to shank bending or stress concentration in non-shoulder designs
Technical Features
Technical Features
- Drop-forged body in heat-treated carbon steel or alloy steel quenched and tempered for strength and toughness
- Shoulder design prevents shank protrusion through the base material
- 5:1 safety factor with minimum breaking load five times the safe working load
- Hot-dipped galvanized finish for corrosion resistance in harsh environments
- Threaded shank designed for full engagement in the base material
- ASME B30.26 compliance for proof load, ductility, identification, and temperature performance
- Marked with working load limit and manufacturer identification on the body
- Available in sizes from 1/4 inch to 1-1/2 inch with full dimensional data provided
Specifications
S279 Shoulder Type Machinery Eye Bolt Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Capacity Range | 1/4 inch to 1-1/2 inch diameter |
|---|---|
| Material | Forged steel, drop forged, quenched and tempered |
| Safety Factor | 5:1 minimum breaking load to safe working load |
| Finish | Hot-dipped galvanized |
| Standards | ASME B30.26 |
| Design Factor | 5:1 |
| Proof Load | Meets or exceeds ASME B30.26 requirements |
| Fatigue Life | Tested and meets ASME B30.26 performance criteria |
| Impact Properties | Validated per ASME B30.26 |
Full size table on request. The catalogue publishes a full dimension and capacity table for this item. Ask on WhatsApp or by email and we will send it as a PDF.
Materials
Materials And Finishes
- Forged steel body drop forged then quenched and tempered for high strength and impact resistance
- Hot-dipped galvanized coating applied after forging to resist rust and corrosion
- Threaded shank made from the same heat-treated steel to ensure consistent strength
- Material selected to meet ASME B30.26 requirements for ductility and fatigue performance
Manufacturing Process
How This Product Is Made
1Drop forging of the eye bolt blank from high-strength steel billet
2Quench and temper heat treatment to achieve required hardness and toughness
3Machining of the threaded shank and shoulder profile to precise dimensions
4Galvanizing by hot-dip process to provide corrosion protection
5Proof load testing on production batches
6Marking of working load limit and manufacturer ID on the body
7Final inspection and packing in cartons or gunny bags on pallets
Quality Control
Quality Control On Every Batch
- Proof load test on each production batch to verify strength and integrity
- Dimensional tolerance check against published size table
- Breaking strength validation to confirm 5:1 design factor
- Visual and dimensional inspection of the galvanized coating for uniformity and coverage
- Material Test Certificate to EN 10204 3.1 issued with the order on request
- Third-party inspection accepted at the Qingdao warehouse before shipment
Customisation
Customisation Options
- Custom tonnage stamping on the body for traceability
- Private label and OEM marking available
- Custom surface finish including zinc plating, powder coating, or electrophoretic black
- Sizes and configurations built to a supplied drawing
- Packing configuration adjusted for carton count, pallet pattern, or retail pack
Compare
How It Compares With The Alternatives
An honest read on where this pattern wins and where another one would serve you better.
| Alternative | Honest Trade Off |
|---|---|
| Standard Eye Bolt | The shoulder type eliminates shank protrusion, making it suitable for flush mounting and angular loading, while a standard eye bolt may interfere with adjacent parts |
| Shoulder Type Eye Bolt with Threaded Shank | This version has a full thread engagement and higher strength due to quenching and tempering, while a non-heat-treated version may fail under dynamic load |
| Screw Pin Eye Bolt | The threaded shank provides a more secure and permanent connection than a screw pin, which can loosen under vibration |
| Regular Machinery Eye Bolt | This version has a shoulder and is designed for angular loading with full thread engagement, while a regular version may lack the shoulder and have reduced strength in off-axis pulls |
Use Guide
How To Use And Inspect S279 Shoulder Type Machinery Eye Bolt
- Ensure the bolt is fully threaded into the base material to achieve full load transfer
- Verify the shoulder is flush with the mounting surface to prevent interference
- Do not exceed the stamped working load limit under any condition
- Inspect the galvanized coating for damage before installation; damaged areas may corrode faster
- Use only with materials that can support the required thread engagement depth
- Retire the bolt if the shoulder shows deformation, the threads are stripped, or the marking is illegible
- Confirm the load path is aligned with the axis of the bolt to avoid side loading
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Answers
S279 Shoulder Type Machinery Eye Bolt FAQ
What is the difference between a shoulder type machinery eye bolt and a standard eye bolt?
The shoulder type has a shoulder that prevents the shank from protruding through the base material, transferring all load through the threads. A standard eye bolt has a protruding shank that can interfere with adjacent components.
Is this bolt rated for angular loading?
Yes. The shoulder type machinery eye bolt is specifically designed for angular loading, with a 5:1 safety factor and full thread engagement to handle off-axis forces.
What safety factor does this bolt carry?
A 5:1 safety factor, meaning the minimum breaking load is five times the stated safe working load.
What certificates are provided with the order?
A Material Test Certificate to EN 10204 3.1 is supplied on request. Every batch is proof load tested and dimensionally checked.
Can you custom stamp our brand and tonnage?
Yes. Custom tonnage stamping, private label marking, and OEM packing are standard options. Finishes can be zinc plated, powder coated, or electrophoretic black.
How are the bolts packed for export?
Standard packing is cartons or gunny bags on pallets. We can configure carton count and pallet pattern to match your warehouse or retail pack. Goods can be stored free in Qingdao for up to two months.
What sizes are available?
Sizes range from 1/4 inch to 1-1/2 inch in diameter. Full dimensions including A, B, C, D, E, F, G are provided in the size table.
Need A Quote On S279 Shoulder Type Machinery Eye Bolt
Send the sizes, the finish and the quantity on WhatsApp or by email. You get a priced reply within 24 hours and a straight answer on stock.
We reply within 24 hours on WhatsApp or by email. Send a drawing, a photo or a bill of materials and we will quote it as it stands.