3.4 Eyebolt Installation, Inspection & Rejection Criteria

Eyebolt Installation, Inspection and Rejection

An eyebolt is safe only as a complete load path: eye, collar or shoulder, threaded shank, mating thread and parent material. A sound forging can still fail if it is installed in the wrong material, bottomed in a blind hole, loaded out of its permitted plane, or used with a sling angle that the product rating does not cover.

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1. Identify the Product Before Using It

Fixed eyebolts, collar eyebolts, dynamo eyebolts, eyenuts and articulated lifting points do not share one rating rule. Read the permanent marking and match it to the certificate or manufacturer instructions. Confirm at least:

• thread form, diameter and pitch;
• product standard or manufacturer model;
• material grade and WLL;
• allowed load direction and any angular reduction;
• required tightening torque, seating method and thread engagement; and
• temperature, corrosion and reuse restrictions.

Do not substitute a similar-looking fastener. A general-purpose commercial eyebolt is not automatically a rated lifting point, and mixing metric and imperial threads can produce a connection that appears to start but has inadequate flank engagement.

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2. Installation Sequence

Prepare the Parent Connection

The tapped hole, nut or female thread must have adequate strength and engagement for the load case. There is no safe universal rule that steel always needs exactly one diameter of engagement, cast iron one-and-a-half, and aluminium two. Those proportions appear in some guidance, but the required engagement depends on thread form, parent-material strength, product design and manufacturer instructions. If the drawing or instructions do not establish the connection, an authorised engineer must do so.

Clean the mating threads and inspect them for corrosion, galling, cross-threading and damage. In a blind hole, remove swarf and fluid and check that the shank cannot bottom before the bearing face seats. Hydraulic pressure from trapped liquid and mechanical bottoming can both create a misleading feeling of tightness.

Seat and Align

A shoulder or collar intended to bear on the load must seat fully on a flat surface prepared as the instructions require. Tighten using the specified method and torque; do not use the eye as a lever. Do not force alignment by backing off a threaded eye unless the product instructions expressly provide an approved shim or alignment system.

Orient the eye in the permitted load plane. A fixed eye that can accept an in-plane angular load may still have little or no capacity for side loading across the eye. Apply the marked angular reduction or rating table to the actual sling direction. If the direction can change during the lift, use a lifting point designed and rated for that movement.

Connect the Sling Correctly

The hook, shackle or other connector must bear in the intended region without point loading, wedging or crowding the eye. Check that the connector can articulate and that its body or pin will not lever against the eye. Never pass an unprotected sling over a sharp eye edge or use a makeshift bolt through an eye.

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3. Pre-use Inspection

Before use, verify identity and WLL, then examine:

• the eye for wear, elongation, nicks, gouges and distortion;
• the collar, shoulder and shank transition for cracks or bending;
• threads for flattening, stripping, corrosion and pitch damage;
• the bearing face for burrs, uneven contact or evidence of movement;
• the parent thread and surrounding structure for cracking or deformation; and
• any articulated bearing, bolt, retaining element or rotation mechanism for condition and freedom of movement.

A magnifying glass, gauges or NDT may be part of a competent-person examination when the product, history or suspected defect justifies them. NDT is not automatically required for every pre-use check, and a casual visual check is not a substitute for the statutory thorough examination.

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4. Rejection and Control

Withdraw the lifting point from service if its identity or WLL is missing, the correct thread cannot be confirmed, it will not seat as designed, or there is a crack, bend, significant deformation, damaged thread, severe corrosion, heat damage or unauthorised modification. Numerical wear limits come from the product standard or manufacturer; do not transfer a ten-percent rule from one product to every eyebolt.

Quarantine the rejected item so it cannot return to service. The competent person or authorised repair process decides whether further examination, replacement or controlled disposal is appropriate. Do not weld, straighten, grind or re-cut a rated lifting point unless a documented manufacturer-approved process permits it. Destruction by torch or grinder is also not a universal operator action because it introduces hot-work and fragment hazards; follow the site's controlled disposal procedure.

Under LOLER, lifting accessories normally receive thorough examination at least every six months unless a competent-person examination scheme specifies another interval. They must also be examined after exceptional circumstances liable to jeopardise safety. Pre-use checks and maintenance remain separate controls.

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5. Articulated Lifting Points

A swivel hoist ring or articulated lifting point can rotate and pivot so its bail aligns with the applied load. This can reduce the out-of-plane bending risk associated with a fixed eye, but “swivelling” does not mean universally full capacity at every angle. Capacity, bolt grade, tightening torque, permitted rotation under load and inspection criteria are model-specific. Use the WLL table for the exact model, thread, loading direction and number of lifting points.

The exam principle is simple: identify, seat, align, rate, inspect. If any one of those steps cannot be demonstrated, stop and verify before lifting.