Forklift Chains Maintenance Guide

Forklift Chains — Types, Inspection & Replacement | MagnaSource

Forklift Chains: Types, Inspection, and When to Replace

A failed forklift chain does not give much warning. One day the load feels normal. The next, you have a mast failure, a dropped load, and an OSHA recordable — and a repair bill that dwarfs what a replacement chain costs. Most chain failures are preventable. This page covers chain types, OSHA inspection requirements, how to measure wear, and how to find the right replacement chain for your equipment.

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What Are Forklift Chains and What Do They Do?

Forklift chains are the load-bearing steel links that transfer hydraulic cylinder force to the mast carriage, lifting and lowering the forks and any load on them. They are the mechanical link between the cylinder and the carriage — every pound a forklift lifts passes through those chains.

On most counterbalanced forklifts, two lift chains run parallel — one on each side of the mast — anchored at both ends: one end to the inner mast or carriage, the other to a fixed point on the outer mast or frame. A chain sheave (pulley) at the top of the hydraulic cylinder provides mechanical advantage. When the cylinder extends, the chains pull the carriage upward. When it retracts, the carriage descends by gravity or controlled hydraulic pressure.

Key Components in a Forklift Chain Assembly

Lift Chains (Mast Chains)

The primary load-bearing chains that raise and lower the forks. These are the chains that wear and require routine inspection.

Anchor Rods

Threaded rods and nuts at each chain end. Anchor rod condition should be checked at every inspection — a failed anchor rod is as dangerous as a failed chain link.

Chain Sheaves

The grooved wheels the chain rides over. A worn or cracked sheave accelerates chain wear significantly and should be inspected whenever chains are replaced.

Chain Lubricant

Most OEMs specify dedicated chain lubricant applied to inner plate faces and pin surfaces regularly — not just to outer surfaces where it does little good.

Forklift Chain Types: Simplex, Duplex, and Leaf Chain

Not all forklift chains are the same. The correct chain type depends on the forklift model, mast configuration, and rated capacity. Ordering the wrong type is a common and expensive mistake.

Simplex Roller Chain

Single-strand. One row of rollers between two plates.

Typical Use

Electric stand-up reach trucks, narrow-aisle equipment, lighter-capacity counterbalanced lifts (under ~4,000 lb). Common in Ingersoll-Rand and some older TCM models.

ANSI: 40, 50, 60

Duplex Roller Chain

Double-strand. Two parallel rows of rollers — roughly double the strength of comparable simplex.

Typical Use

Most counterbalanced IC forklifts from 3,000–15,500 lb. Toyota, Hyster, Yale, Crown, Caterpillar Towmotor, Raymond. The most common forklift chain type in service.

ANSI: 2040, 2050, 2060, 2080

Leaf Chain

No rollers — interlocking link plates only. Wider and flatter, built for high bending loads.

Typical Use

High-capacity forklifts, rough-terrain equipment, telehandlers, Sky Trak, Teledyne Princeton. Also used as counterbalance chain in some reach trucks.

BL-series: BL444, BL446, BL522, BL534, BL623, BL634

Chain Type	Has Rollers	Strands	Common Applications
Simplex	Yes	1	Light-duty, reach trucks, narrow aisle
Duplex	Yes	2	Most IC counterbalanced forklifts
Leaf	No	Multiple plates	High-capacity, rough terrain, telehandlers

When in doubt, check the OEM parts manual or contact MagnaSource with your machine model and serial number. The chain is not the place to approximate.

When Should You Replace a Forklift Chain? The 3% Rule Explained

Replace a forklift chain when it shows visible damage — cracking, corrosion, stiff links, or damaged side plates — or when elongation exceeds 3% of original length. That 3% figure is not a rule of thumb. It is the OSHA standard.

OSHA 1910.178 and Forklift Chain Requirements

OSHA 29 CFR 1910.178(q)(1) requires that powered industrial trucks be maintained in safe working condition and removed from service when unsafe. OSHA inspectors reference ANSI/ITSDF B56.1 for lift truck compliance, which specifies chain replacement at 3% elongation beyond original manufactured length.

What 3% Elongation Means in Practice

Chain wear occurs at the pins and bushings inside each link — not at the outer plates. As pins wear, each link gets microscopically longer. Over hundreds of operating hours, those fractions add up to a measurable and dangerous difference.

How to calculate: Multiply chain pitch by 12 to get the reference length for a 12-link span. Measure that same span on the in-service chain. If the measured length exceeds the reference by 3% or more, both chains are out of service.

Example: Standard 5/8" pitch duplex chain
New 12-link length: 12 × 0.625" = 7.500"
3% wear limit: 7.500" × 1.03 = 7.725"
If your measurement is 7.725" or greater → replace both chains.

Not sure about your chain's pitch?

The MagnaSource Chain Wear & Measurement Quick Reference Guide covers the most common forklift chain sizes in one printable chart — stretch measurements, inspection steps, and replacement thresholds.

Download Chain QRG (PDF)

Visual Inspection Criteria — Replace Immediately

Do not wait for 3% elongation if the chain shows any of the following:

Cracked, bent, or corroded side plates
Stiff or binding links that do not flex freely
Elongation in one section but not others (uneven wear signals a sheave or anchor problem)
Rust pitting on link plates or pins
Any visible cracks near the pin area

How to Inspect and Measure Forklift Chain Wear

Forklift chain inspection is a daily pre-operation check and a scheduled maintenance task. OSHA and ANSI B56.1 require inspection before each shift. Done correctly, a complete chain inspection takes less than five minutes.

1
Power down and position the mast – Lower forks fully to the ground, tilt mast slightly forward, and shut down the forklift. Never work under a raised mast or unsupported load.
2
Visual inspection – full chain length – Walk both chains end to end. Look for rust or corrosion, cracked plates, dark or heat-damaged links, and any stiff or misaligned links. Use a flashlight on inner mast chains.
3
Check anchor rods and chain pins – Inspect anchor rod threads at both ends of each chain. Threads should be clean, nuts fully engaged, and cotter pins or locking hardware intact.
4
Measure a 12-link span – Using a steel ruler, measure pin-center to pin-center across 12 consecutive links in the highest-wear zone – the section that runs over the sheave.
5
Calculate elongation and compare to spec – Divide measured length by the new reference length. If the result is 1.03 or greater, the chain is at or beyond 3% elongation – replace both chains immediately.
6
Always replace in pairs – Both chains must be replaced simultaneously. One new chain plus one worn chain creates uneven mast loading – a safety hazard and a way to destroy the new chain quickly.
7
Lubricate before installation – Apply OEM-specified chain lube to inner plate faces before the chain goes on. External lube on outer plates does little to protect the wear surfaces inside.

Reference: 12-Link New Length & 3% Wear Limits by Chain Pitch

Pitch	Chain Size	12-Link New Length	3% Wear Limit
3/8"	ANSI 06B / #35	4.500"	4.635"
1/2"	ANSI 40 / 2040	6.000"	6.180"
5/8"	ANSI 50 / 2050	7.500"	7.725"
3/4"	ANSI 60 / 2060	9.000"	9.270"

For leaf chain or non-standard pitches, consult your OEM spec or download the MagnaSource Chain Wear QRG.

How to Choose the Right Forklift Chain for Your Equipment

Match Chain Type to Your Forklift

Electric stand-up reach trucks and order pickers: Usually simplex roller or BL-series leaf chain depending on manufacturer and mast design.
IC counterbalanced 3,000–10,000 lb: Almost always duplex roller chain. ANSI size (2040, 2050, 2060) depends on capacity class and model year — do not assume same-capacity lifts use the same chain.
High-capacity IC, rough-terrain, telehandlers: Leaf chain (BL-series) standard. Verify BL designation against OEM parts book.
Older or specialty equipment (Caterpillar Towmotor, early TCM): May use non-standard pitches. MagnaSource cross-references these — provide serial number if parts book is unavailable.

When ordering, have your forklift model number, serial number, and OEM part number from the parts manual. MagnaSource cross-references all three before your order ships.

MagnaSource Stocks Chains For:

Toyota Hyster Crown Caterpillar Towmotor Ingersoll-Rand Raymond TCM Sky Trak Teledyne Princeton

Browse Chains by Manufacturer →

Forklift Chain FAQ

How long do forklift chains last?

Chain service life depends on application intensity, lubrication frequency, and environment. In a standard indoor distribution center running one shift per day with proper lubrication, chains on a medium-duty forklift may last 3,000–6,000 hours. In outdoor, wet, or high-cycle applications, service life can be significantly shorter. Inspect every 250 hours (or per your OEM schedule) and replace at 3% elongation regardless of hours.

Can I replace just one forklift chain?

No. Both chains must be replaced at the same time. Chains on the same mast wear together and load-share constantly. Replacing one side introduces uneven tension across the carriage, which accelerates wear on the new chain and creates asymmetric load behavior – a safety hazard with any offset load.

What causes forklift chains to wear out faster?

The four most common causes: insufficient or incorrect lubrication; operating in wet, muddy, or chemically corrosive environments; worn chain sheaves (a rough sheave surface grinds the chain from the outside); and overloading beyond the rated capacity. Any one of these can cut chain service life in half.

Is forklift chain inspection required by OSHA?

Yes. OSHA 29 CFR 1910.178(q)(1) requires powered industrial trucks be maintained in safe working condition and removed from service when unsafe. OSHA 1910.178(e)(1) requires pre-shift inspection before each use. ANSI/ITSDF B56.1 — the standard OSHA inspectors use — specifies chain replacement at 3% elongation. Chain inspection is a documented, enforceable requirement.

Where can I buy replacement forklift chains?

MagnaSource stocks forklift lift chains cross-referenced to Toyota, Hyster, Crown, Caterpillar Towmotor, Ingersoll-Rand, Raymond, TCM, Sky Trak, Teledyne Princeton, and other major makes. Shop at magnasourceinc.com. Have your model number and OEM part number ready for the fastest match.

What is the difference between a lift chain and a drive chain?

A lift chain (mast chain) is a load-bearing chain that raises and lowers the fork carriage under tension proportional to the load. A drive chain transmits rotational power — from a transmission to drive axles, for example. They are not interchangeable. Lift chains run vertically inside or alongside the mast; that position identifies them. Inspection intervals and replacement criteria differ between the two.

Shop Popular Forklift Chains from MagnaSource

MagnaSource stocks forklift lift chains cross-referenced to Toyota, Hyster, Crown, Caterpillar Towmotor, Ingersoll-Rand, Raymond, TCM, Sky Trak, and Teledyne Princeton equipment. Current inventory includes duplex roller chain, simplex roller chain, BL-series leaf chain, and anchor hardware across the most common sizes in service today.

Caterpillar Towmotor 9423051030 CHAIN ASSEMBLY - MAST LIFT	Hyster 0135634 CHAIN - 10 FT	Hyster 1342118 CHAIN	Hyster 180177 CHAIN - 10 FT
Hyster 259660 CHAIN - PTO	Hyster 341123 CHAIN - 10 FT	Ingersoll-Rand 59101048 CHAIN ANCHOR ROD	Ingersoll-Rand 59157339 CHAIN - EXTENSION
Ingersoll-Rand 59158030 CHAIN EXTENSION VR843	Jlg 7138738 SERVICE KIT - EXTEND CHAIN	Raymond 1147351-100 CHAIN - CUT TO LENGTH USA - SHIPS FROM I…	Sky Trak 8024032 SERVICE KIT - EXTEND CHAIN
Sky Trak 8024033 SERVICE KIT - RETRACT CHAIN	Sky Trak 8127024 CHAIN - RETRACT	TCM 22679-45991W CHAIN ASSEMBLY -LIFT	Teledyne Princeton 911.025-10 CHAIN - 10 FT
Toyota 90632-U5097-71 CHAIN ASSEMBLY - MAST LIFT	Toyota 90632-U5119-71 CHAIN ASSEMBLY - MAST LIFT	Toyota 90632-U6083-71 CHAIN ASSEMBLY - MAST LIFT	Toyota 90632-U6099-71 CHAIN ASSEMBLY - MAST LIFT
Toyota 90632-U7063 CHAIN ASSEMBLY - MAST LIFT	Toyota 90632-U7065-71 CHAIN ASSEMBLY - MAST LIFT	Toyota 90632-U7067-71 CHAIN SUB-ASSEMBLY	Toyota 90632-U7075-71 CHAIN ASSEMBLY - MAST LIFT

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