Eye Bolts
Manufacturer
India · Mumbai
Anatomy of an Eye Bolt — Threaded Shank, Load-Bearing Loop
An eye bolt consists of a threaded shank with a forged circular loop, or “eye,” in place of a conventional bolt head. The threaded end drives directly into a tapped hole in a machine casing, lifting lug, or structural member — or passes through a clearance hole and is secured with a nut — leaving the eye standing proud, ready to accept a shackle, hook, or sling for lifting and rigging.
This is the bolt-side counterpart to our Lifting Eye Nuts: where an eye nut threads onto a stud or bolt that is already fixed in place, an eye bolt threads directly into the equipment or structure itself, making it the correct choice whenever the lifting point needs to be created from a plain tapped hole rather than an existing protruding stud.
Like our lifting eye nuts, every eye bolt is drop-forged, not simply machined from bar stock, and individually proof-tested to a specified multiple of its rated working load before dispatch — critical since this component’s entire purpose is bearing suspended load with a documented safety margin. The single most important specification decision on any eye bolt is whether it has a shoulder — this determines whether the eye can safely take an angled pull at all, covered in full detail below.
Why Eye Bolts — A Rated Point Where None Existed Before
Creates a Lifting Point From a Plain Tapped Hole
Unlike an eye nut, which needs an existing stud to thread onto, an eye bolt only requires a tapped hole — making it the correct choice for adding a documented lifting point directly to a machine casing, lug, or structural member.
Drop-Forged for Genuine Load-Bearing Integrity
Forging aligns the material’s internal grain flow around the eye’s curve, giving genuinely higher fatigue and shock resistance under lifting load than a machined or cast equivalent — the same reasoning applied to our lifting eye nuts.
Individually Proof-Tested, Not Batch-Sampled
Because each eye bolt may be relied on to support a specific, documented working load, every piece is proof-tested individually to a specified multiple of its rated capacity before dispatch — a batch statistical sample is not sufficient for this product category.
Clear Rated Capacity at a Specified Angle
Every eye bolt we supply carries a documented working load limit tied explicitly to the correct angle of pull for its type — removing any ambiguity between what the eye is actually rated for and how it happens to be rigged on site.
Shoulder vs Plain — Why Angle of Pull Changes Everything
A plain (unshouldered) eye bolt has no collar beneath the eye — the eye sits directly against the mounting surface with nothing to resist a sideways or angled component of load. Plain eye bolts are rated for straight, in-line vertical pull only. Applying any significant angular load to a plain eye bolt creates a bending moment on the threaded shank that the design never accounted for, and can bend the eye, loosen the thread engagement, or fail the bolt well below its straight-pull rated capacity.
A shoulder eye bolt has a distinct collar beneath the eye, designed to seat fully and squarely against the mounting surface when correctly torqued down. This shoulder bears the angular component of the load directly against the mounting surface rather than putting bending stress into the shank alone — which is why shoulder eye bolts, and only shoulder eye bolts, are rated for angular loading, typically up to 45° from vertical, with capacity progressively derated as the angle increases toward that limit.
The practical rule is simple and non-negotiable: if a lift genuinely requires anything other than a straight vertical pull, only a correctly torqued shoulder eye bolt is appropriate — a plain eye bolt must never be substituted for angular rigging regardless of how tempting the eye’s shape makes that substitution look. Always confirm the eye bolt’s actual rated working load at the specific angle the rigging plan requires, not simply its straight-pull capacity.
Plain Eye Bolts vs Shoulder Eye Bolts
Both are forged and proof-tested — the shoulder is what unlocks safe angular loading capability.
Plain (Unshouldered) Eye Bolt
No collar beneath the eye. Rated strictly for straight, in-line vertical pull. Lower cost, simpler geometry, correct wherever the rigging plan genuinely never introduces an angular load component.
Shoulder Eye Bolt
A distinct collar seats against the mounting surface when fully torqued, bearing the angular load component directly rather than stressing the shank. Rated for angular pull up to a specified angle, typically 45°, with derated capacity as angle increases.
Eye Bolt Material & Strength Options
Grade selection follows the rated working load and service environment — always confirm capacity at the actual rigging angle, not just straight-pull rating.
Eye Bolt Configurations & Related Hardware
Plain and shoulder eye bolts across the full material range, individually proof-tested. M8–M64.
Plain Eye Bolt
Standard unshouldered configuration per DIN 580. M8–M64. Straight-pull rated, forged and proof-tested. The default for confirmed vertical-only lifting points.
Shoulder Eye Bolt
Collared configuration per DIN 6379. M8–M64. Rated for angular pull up to 45° when correctly torqued down. The correct choice for multi-leg or angled rigging.
Matching Lifting Eye Nuts
For applications with an existing fixed stud rather than a tapped hole. View Lifting Eye Nuts →
Custom Eye Bolts
Non-standard rated capacity, custom eye diameter, and drawing-specific configurations. Contact sales@akbarfasteners.in with working load, angle of pull, and thread size.
Eye Bolt Size Chart — M8 to M64
Thread size and typical rated working load at straight vertical pull — always confirm against the specific rigging angle and manufacturer’s certified load table.
| Thread Size | Eye Inside Ø (mm) | Typical WLL Straight Pull (kg) | Typical WLL at 45° (kg) |
|---|---|---|---|
| M8 | 20 | 140 | 35 (shoulder only) |
| M10 | 23 | 230 | 60 (shoulder only) |
| M12 | 26 | 340 | 85 (shoulder only) |
| M16 | 32 | 620 | 155 (shoulder only) |
| M20 | 38 | 1000 | 250 (shoulder only) |
| M24 | 44 | 1500 | 375 (shoulder only) |
Values shown are general reference only. Always use the manufacturer’s certified working load table for the specific eye bolt supplied — plain eye bolts must never be loaded at an angle under any circumstances.
Eye Bolts Application Areas
Rated lifting and rigging points across machinery, structural, and general industrial handling.
Machinery Lifting Points
equipment hoisting eyes
General Rigging & Lifting
multi-leg sling rigging points
Crate & Container Lifting
heavy machinery packaging
Structural Steel Erection
installation and positioning
Power Generation Equipment
maintenance lifting points
Industrial Equipment Handling
maintenance and installation
Marine & Offshore
deck and equipment rigging
Solar & Structural Panel Lifting
frame positioning rigging
Eye Bolt Standards Coverage
Same ISO 9001:2015 quality system as our complete fastener range. Every eye bolt individually proof-tested against its rated working load before dispatch.
Complete Documentation Package
Grade Stated
Test Certificate
By Angle of Pull
Conformance
On Request
Related Bolt Types & Materials
Eye bolts for tapped-hole lifting points. Lifting eye nuts for the matched stud-mounted alternative. SS 316L for corrosive-environment rigging.
Lifting Eye Nuts
The stud-mounted counterpart to this page’s tapped-hole eye bolt — threads onto an existing fixed stud rather than requiring a tapped hole of its own.
View Lifting Eye Nuts →U-Bolts
Another encircling, no-head rigging-adjacent fastener — for clamping round or square-section objects against a mounting bracket rather than providing a lifting point.
View U-Bolts →SS 316L Fasteners
For eye bolt applications in marine, offshore, or corrosive-environment rigging where carbon steel’s corrosion resistance is insufficient.
View SS 316L →Full Bolt Range
Complete bolt manufacturing capability at Akbar Fasteners — eye bolts, heavy hex, socket head, and all specialty forms across every material grade.
View Bolt Range →Need Eye
Bolts?
Shoulder or plain · working load · angle of pull · quantity. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Export: +91 8696 32 4646 · Support: +91 800 9315 333 · export@akbarfasteners.in