An oblong ring, often called a master link, is an elongated steel ring used at the top of a sling assembly. It gathers one or more sling legs and sits on the crane hook, giving a single, well-shaped connection point for the lift.
Also known asMaster link · Oblong master link · Sling ring · Crane ring
Key takeaways
Acts as the top link connecting sling legs to the hook.
Inside dimensions must fit the crane hook and sling fittings.
Number of legs and sling angle affect the rating needed.
Rated, marked and documented for lifting use.
How Oblong Rings Work in Practice
In a multi-leg chain or wire-rope sling, every leg terminates at the master link. Its oblong shape seats properly in the hook bowl while leaving room for the leg connections, so the load is shared as designed.
Specify the inside length and width so the ring fits the crane hook, the section diameter, and the number of legs and required working load limit. For four-leg assemblies, a master link assembly with intermediate sub-links is often used.
Common Oblong Ring Forms
01
Single master link
For single- and two-leg sling assemblies.
02
Master link assembly
Master link with two sub-links for three- and four-leg slings.
03
Pear-shaped link
Narrower at one end to help keep fittings positioned.
04
Welded or forged construction
Production route confirmed against the rating requirement.
How to Choose the Right Oblong Ring
01
Working Load Limit
The master link must be rated for the full assembly load, including the effect of leg angles.
02
Hook Fit
Inside dimensions must allow the ring to seat freely in the hook bowl without binding.
03
Sling Angle
Wider leg angles increase force in each leg; state the intended angle range.
04
Assembly Compatibility
The ring must suit the connectors on each leg; share the sling details.
Safety note
Lifting and load-bearing products must be selected against a confirmed working load limit, the applicable standard and the actual rigging arrangement. Never use a part beyond its marked or documented rating, and inspect before every use.
Oblong Ring Specifications
Use this framework to prepare a complete enquiry. Values are confirmed against your drawing, application and required quantity.
Oblong Ring specification framework
Parameter
Requirement basis
Product type
Oblong ring / master link
Working load limit
State the required WLL
Number of sling legs
1, 2, 3 or 4
Inside length & width
To suit crane hook and leg fittings
Section diameter
As required by rating
Material
As specified
Finish
Painted, plated or as required
Marking & certificates
State marking and test-document needs
What to include in your enquiry
Required WLL and number of legs
Crane hook size for fit
Inside length/width and section
Marking, documents and quantity
Where Oblong Rings Are Used
Typical application areas. The intended task should always be disclosed so the product form and specification can be evaluated correctly.
01
Multi-leg chain slings
Top link gathering two to four legs
02
Wire-rope sling sets
Master link for multi-leg rope assemblies
03
Crane hook connections
Well-seated single-point hook attachment
04
Lifting beams & frames
Connection points for spreader arrangements
Have a specific application in mind? Share the load, environment and arrangement for a review.
Oblong Ring FAQs
What is an oblong ring in lifting?
An oblong ring, or master link, is the elongated top ring of a sling assembly. It connects the sling legs to the crane hook in a single connection.
What is the difference between a master link and a master link assembly?
A master link is a single oblong ring. A master link assembly adds two smaller sub-links so that three or four sling legs can be connected evenly.
How do I size an oblong ring for my crane hook?
The inside width and length must allow the ring to sit freely in the hook bowl. Share the hook size or model along with the required WLL.
Does sling angle affect the master link?
Yes. As the angle between legs widens, the force in each leg increases, which affects the rating required for the whole assembly.
Can an oblong ring be used without marking?
Lifting components should carry identification and rating marks with supporting documents. State your marking and certificate needs in the enquiry.
What details are needed for an oblong ring quotation?
Provide the required WLL, number of legs, crane hook size, inside dimensions, section, finish, marking and documentation needs, and quantity.
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