Technical Foundation
What Is a Chain Link?
A connecting or master link joins two lengths of chain, or closes a chain into a loop, without requiring the chain to be pressed or riveted. For ANSI roller chain, this is typically a spring-clip or cotter-pin link matched exactly to the chain number (pitch and roller diameter); for grade 70/80/100 transport and lifting chain, cam-and-groove or hammerlock-style links are used because they carry a rated working load limit (WLL) that must match or exceed the chain's own rating.
A link is never stronger than its rated WLL, and mixing link grades with chain grades is a common and dangerous error — a grade 70 link on grade 80 chain de-rates the entire assembly to the weaker component. Roller chain master links additionally must match the chain's pitch and roller width precisely; an incorrect link will bind or wear the sprocket prematurely even if it happens to physically fit.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Chain Number/Size | ANSI number (e.g. #40, #60) or nominal diameter (5/16", 3/8") | Determines pitch and roller diameter for roller chain, or link bar diameter for lifting chain |
| Working Load Limit (WLL) | Rated maximum load per link, stamped or documented | Must match or exceed the chain grade — a weaker link de-rates the whole assembly |
| Link Mechanism | Cotter pin, spring clip, cam & groove, hammerlock | Determines whether the link is field-serviceable or requires tools to disassemble |
| Grade | Grade 30, 43, 70, 80, 100 | Grade must match the connected chain — mixing grades limits the assembly to the lower rating |
| Material/Finish | Carbon steel, alloy steel, zinc-plated, self-colored | Alloy steel grade 80/100 links are heat-treated and not interchangeable with lower-grade carbon steel links |
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Applications
Where Chain Links Get Used
Chain links are specified anywhere a chain needs to be joined, closed into a loop, or field-repaired without pressing new pins.
Material Handling & Conveyor Systems
Roller chain master links for field-splicing and maintaining drive chains on conveyors without full chain replacement.
Rigging & Lifting Operations
Grade 80/100 cam-and-groove links rated to match alloy chain slings in overhead lifting applications.
Transportation & Load Securement
Grade 70 transport chain links for repairing tie-down chains used in trucking and cargo securement.
Agricultural Equipment
Roller chain repair links for maintaining drive and elevator chains on combines, balers and grain handling equipment.
Forestry & Logging
Heavy-duty connecting links for skidder and log chain assemblies exposed to high shock loads.
Marine & Towing
Corrosion-resistant master links for anchor and mooring chain repair in marine environments.
FAQ
Chain Links Questions, Answered
What's the difference between a master link and a repair/connecting link?
The terms are largely used interchangeably in the field, but 'master link' more often refers to roller chain hardware (spring-clip or cotter-pin style, matched to a specific ANSI chain number), while 'connecting link' or 'repair link' more commonly refers to grade 70/80/100 lifting and transport chain hardware using cam-and-groove or hammerlock mechanisms. Both serve the same function: joining two chain ends without pressing a permanent pin.
Can I mix chain grades and link grades?
No. A connecting link's working load limit must match or exceed the grade of chain it joins — using a lower-grade link on higher-grade chain de-rates the entire assembly down to the weaker component's rating, which is a common and dangerous field error. Always confirm the link is stamped or documented for the same grade (70, 80, 100) as the chain.
How do I size a roller chain master link correctly?
Match the link to the chain's ANSI number (e.g., #40, #50, #60), which defines the pitch, roller diameter, and plate width. A master link for the wrong chain number may physically press onto adjacent links but will not seat correctly on the sprocket, causing binding, accelerated wear, or chain jumping under load.
What's a cam-and-groove link and when is it used?
A cam-and-groove connecting link uses a cam-shaped side plate that locks into a groove on the mating link, providing a rated, removable connection for grade 70/80/100 chain used in lifting slings and transport/tie-down applications. It's field-serviceable with basic tools and carries a documented working load limit, unlike a weld link which is permanent.
Are chain links inspected and rated the same way as the chain itself?
Yes — connecting links used in overhead lifting must carry manufacturer load ratings, be regularly inspected for wear, deformation and cracking, and be replaced (not repaired) if damaged. Links used in non-critical applications like conveyor drive chains still benefit from periodic inspection but don't typically require the same certification documentation as rigging hardware.
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