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Shoulder Eye Bolts are load-rated fasteners designed for secure lifting, rigging, and anchoring applications where angular loads and heavy-duty performance are critical. Unlike standard eye bolts, these feature a machined shoulder that provides stability under angled loading conditions, making them essential in industries such as construction, oil & gas, heavy equipment manufacturing, and marine operations.
Manufactured from materials such as stainless steel, alloy steel, and high-tensile carbon steel, these bolts typically comply with standards like DIN 580, ASTM A489, and ISO specifications. Their threaded design allows for easy installation into tapped holes, while the forged eye ensures reliable load distribution during lifting operations.
KK Fasteners supplies shoulder eye bolts with full material traceability and consistent dimensional accuracy, supporting project requirements across global industrial markets. For procurement teams, selecting the right shoulder eye bolt directly impacts safety, compliance, and operational efficiency in lifting applications.
| Parameter | Details |
|---|---|
| Material Variants | Stainless Steel (SS 304, SS 316), Carbon Steel, Alloy Steel |
| Grades | ASTM A193 B7, ASTM A320 L7, DIN 580, ISO 3266 |
| Size Range | M6 to M64 / 1/4” to 2-1/2” |
| Thread Type | Metric, UNC, UNF, BSW |
| Standards | DIN 580, ASTM A489, ISO 3266, BS 4278 |
| Surface Finish | Self-color, Zinc Plated, Hot Dip Galvanized, Passivated |
| Type Variants | Forged Shoulder Eye Bolts, Machined Shoulder Eye Bolts |
| Tensile Strength | Up to 800 MPa (depending on material grade) |
| d1 | h | b | d2 | d3 | d4 | k |
|---|---|---|---|---|---|---|
| M6 | 27.5 | 12 | 27 | 19 | 14 | 6.5 |
| M8 | 36 | 13 | 36 | 20 | 20 | 8 |
| M10 | 45 | 17 | 45 | 25 | 25 | 10 |
| M12 | 53 | 20.5 | 54 | 30 | 30 | 12 |
| M14 | 62 | 27 | 63 | 35 | 35 | 14 |
| M16 | 62 | 27 | 63 | 35 | 35 | 14 |
| M20 | 71 | 30 | 72 | 40 | 40 | 16 |
| M22 | 90 | 36 | 90 | 50 | 50 | 20 |
| M24 | 90 | 36 | 90 | 50 | 50 | 20 |
| M27 | 109 | 45 | 108 | 65 | 60 | 24 |
| M30 | 109 | 45 | 108 | 65 | 60 | 24 |
| M33 | 128 | 54 | 126 | 75 | 70 | 28 |
| M36 | 128 | 54 | 126 | 75 | 70 | 28 |
| M42 | 147 | 63 | 144 | 85 | 80 | 32 |
| M45 | 168 | 68 | 166 | 100 | 90 | 38 |
| M48 | 168 | 68 | 166 | 100 | 90 | 38 |
| M52 | 187 | 78 | 184 | 110 | 100 | 42 |
| M56 | 187 | 78 | 184 | 110 | 100 | 42 |
| M64 | 208 | 90 | 206 | 120 | 110 | 48 |
| M72 | 260 | 100 | 260 | 150 | 140 | 60 |
| M80 | 298 | 112 | 296 | 170 | 160 | 68 |
| M100 | 330 | 130 | 330 | 190 | 180 | 75 |
| Direction of pull | ||
|---|---|---|
| Thread Diameter | For One Bolt | For Two Bolts(Pulling at a 45 Degree Angle) |
| M6 | 70 | 50 |
| M8 | 140 | 95 |
| M10 | 230 | 170 |
| M12 | 340 | 240 |
| M14 | 490 | 340 |
| M16 | 700 | 500 |
| M20 | 1200 | 830 |
| M22 | 1500 | 1050 |
| M24 | 1800 | 1270 |
| M27 | 2500 | 1650 |
| M30 | 3600 | 2600 |
| M33 | 4300 | 3200 |
| M36 | 5100 | 3700 |
| M42 | 7000 | 5000 |
| M45 | 8000 | 5500 |
| M48 | 8600 | 6100 |
| M52 | 9900 | 7300 |
| M56 | 11500 | 8300 |
| M64 | 16000 | 11000 |
| M72 | 21000 | 15000 |
| M80 | 28000 | 20000 |
| M100 | 38000 | 27000 |
| Per ASME B18.15-1985 (R1995) | |||||||||||||||||
| Nominal Diameter |
UNC | A | B | C | D | E | F | G | H | J | |||||||
| Shank Diameter |
Shank Length | Eye Inside Diameter |
Eye Outside Diameter |
Overall Length | Eye Section Diameter |
Shoulder Diameter |
Shoulder Thickness |
Eye to Shoulder |
|||||||||
| Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | ||||
| 1/4 | 20 | 0.25 | 1.00 | 1.06 | 0.69 | 0.81 | 1.19 | 2.22 | 2.53 | 0.19 | 0.25 | 0.50 | 0.56 | 0.12 | 0.19 | 0.69 | 0.81 |
| 5/16 | 18 | 0.31 | 1.12 | 1.19 | 0.81 | 0.94 | 1.44 | 2.66 | 2.97 | 0.25 | 0.31 | 0.56 | 0.62 | 0.12 | 0.19 | 0.88 | 1.00 |
| 3/8 | 16 | 0.38 | 1.25 | 1.38 | 0.94 | 1.06 | 1.69 | 3.09 | 3.47 | 0.31 | 0.38 | 0.62 | 0.69 | 0.12 | 0.19 | 1.06 | 1.19 |
| 7/16 | 14 | 0.44 | 1.38 | 1.50 | 1.00 | 1.12 | 1.81 | 3.41 | 3.78 | 0.34 | 0.41 | 0.75 | 0.81 | 0.19 | 0.25 | 1.19 | 1.31 |
| 1/2 | 13 | 0.50 | 1.50 | 1.62 | 1.12 | 1.25 | 2.12 | 3.81 | 4.19 | 0.44 | 0.50 | 0.88 | 0.94 | 0.19 | 0.25 | 1.31 | 1.44 |
| 9/16 | 12 | 0.56 | 1.62 | 1.75 | 1.19 | 1.31 | 2.25 | 4.19 | 4.56 | 0.47 | 0.53 | 0.94 | 1.00 | 0.22 | 0.28 | 1.50 | 1.62 |
| 5/8 | 11 | 0.62 | 1.75 | 1.88 | 1.31 | 1.44 | 2.56 | 4.56 | 4.94 | 0.56 | 0.62 | 1.00 | 1.06 | 0.25 | 0.31 | 1.59 | 1.72 |
| 3/4 | 10 | 0.75 | 2.00 | 2.12 | 1.44 | 1.56 | 2.81 | 5.06 | 5.50 | 0.62 | 0.69 | 1.12 | 1.25 | 0.25 | 0.31 | 1.72 | 1.91 |
| 7/8 | 9 | 0.88 | 2.25 | 2.38 | 1.56 | 1.69 | 3.19 | 5.75 | 6.19 | 0.75 | 0.81 | 1.31 | 1.44 | 0.31 | 0.38 | 2.03 | 2.22 |
| 1 | 8 | 1.00 | 2.50 | 2.62 | 1.69 | 1.81 | 3.56 | 6.44 | 6.88 | 0.88 | 0.94 | 1.50 | 1.62 | 0.38 | 0.44 | 2.22 | 2.41 |
| 1 1/8 | 7 | 1.12 | 2.75 | 2.88 | 1.94 | 2.06 | 4.06 | 7.31 | 7.75 | 1.00 | 1.06 | 1.69 | 1.81 | 0.44 | 0.50 | 2.59 | 2.78 |
| 1 1/4 | 7 | 1.25 | 3.00 | 3.12 | 2.12 | 2.25 | 4.44 | 8.00 | 8.44 | 1.09 | 1.16 | 1.88 | 2.00 | 0.50 | 0.56 | 2.84 | 3.03 |
| 1 1/2 | 6 | 1.50 | 3.50 | 3.62 | 2.44 | 2.56 | 5.19 | 9.22 | 9.72 | 1.31 | 1.38 | 2.12 | 2.25 | 0.50 | 0.62 | 3.19 | 3.44 |
| 1 3/4 | 5 | 1.75 | 3.75 | 3.88 | 2.75 | 3.00 | 6.00 | 10.50 | 11.12 | 1.50 | 1.62 | 2.50 | 2.62 | 0.50 | 0.62 | 3.88 | 4.12 |
| 2 | 4.5 | 2.00 | 4.00 | 4.12/4.25 | 3.06 | 3.44 | 6.88 | 11.53 | 12.22 | 1.75 | 1.88 | 2.88 | 3.00 | 0.62 | 0.75 | 4.25 | 4.50 |
| 2 1/2 | 4 | 2.50 | 5.00 | 5.25 | 3.81 | 4.19 | 8.50 | 14.59 | 15.40 | 2.19 | 2.31 | 3.62 | 3.75 | 0.88 | 1.00 | 5.50 | 5.75 |
Shoulder eye bolts are used in lifting and rigging operations where secure load handling and angular stability are required.
Shoulder eye bolts are typically produced through hot forging or precision CNC machining, followed by threading and surface finishing processes. Forging enhances grain structure, improving mechanical strength and fatigue resistance.
Quality assurance involves dimensional inspection using calibrated gauges, tensile and hardness testing, and visual inspection for surface defects. Coating thickness and corrosion resistance are also verified as per relevant standards.
At KK Fasteners, each batch undergoes traceability checks and documentation aligned with ISO 9001-certified processes, ensuring consistent quality and compliance for industrial applications.
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Shoulder eye bolts are threaded lifting fasteners with a forged loop and a supporting shoulder beneath the eye. The shoulder allows the bolt to handle both vertical and angular loads safely, making it suitable for rigging, hoisting, and load-securing applications in industrial environments.
They are commonly manufactured from stainless steel (SS 304, SS 316), carbon steel, and alloy steel. Stainless steel offers corrosion resistance for outdoor or marine use, while alloy and carbon steel provide higher strength for heavy-duty lifting and structural applications.
Shoulder eye bolts are typically produced according to standards such as DIN 580, ASTM A489, ISO 3266, and relevant BS specifications. These standards define dimensions, load ratings, threading, and material properties to ensure safe and consistent performance.
Selection depends on load capacity, lifting angle, thread size, and environmental conditions. For angled lifting, shoulder eye bolts are preferred over non-shoulder types. Material choice should align with exposure conditions such as corrosion, temperature, and load intensity.
A reliable supplier should offer ISO-certified production, material traceability, and compliance with international standards. KK Fasteners supports global buyers with documented quality control, consistent specifications, and export experience across multiple industrial sectors.
Precision and load safety are non-negotiable in lifting applications, and selecting the right shoulder eye bolt ensures both. KK Fasteners supports industrial buyers with consistent specifications, certified materials, and reliable global delivery. For project inquiries, custom requirements, or technical assistance, request a quote or connect with the engineering team to evaluate the right solution for your application.
