Standard carbon steel roller chain rusts. In a wash-down food line, a marine winch, or a pharma cleanroom conveyor, that's not a maintenance inconvenience — it's a contamination or downtime risk. Stainless steel roller chain solves the corrosion problem, but it does so at a real cost in load capacity, and most buyers don't find that out until they've already spec'd the wrong chain into a drawing.
This guide covers the ANSI sizes actually available in stainless, how their working loads compare to carbon steel at the same pitch, the difference between standard and hollow-pin stainless construction, and where each one belongs.
Stainless vs. Carbon Steel Roller Chain: What Actually Changes
The pitch, roller diameter, and roller width of a stainless chain follow the same ANSI B29.1 dimensions as its carbon steel counterpart — a #40 stainless chain still runs on a #40 sprocket. What changes is the material behind those dimensions:
Corrosion resistance. Stainless resists rust, most food acids, and mild caustic wash-down chemicals. Carbon steel needs a protective coating (zinc, nickel) to get anywhere close, and that coating wears off at the wear points first.
Working load. This is the part most spec sheets bury. Stainless chain consistently runs far below its carbon steel equivalent at the same ANSI size — #40 stainless is rated at 95 lbf here versus 940 lbf for standard #40 steel chain. That gap isn't fixed, though. It shifts depending on the specific stainless product line (standard vs. hollow-pin, covered below), so confirm the working load on the individual product page rather than assuming a set percentage of the steel rating.
Non-magnetic and low-temperature stable. Useful in instrumentation and cold-storage conveyors where a magnetic chain would interfere with sensors, or where carbon steel would embrittle.
No lubrication in most cases. Stainless doesn't need oil to prevent rust the way carbon steel does, which is why it shows up in food and pharma lines where lubricant contamination is a compliance issue.
The practical takeaway: stainless earns its place on corrosion and hygiene, not on strength. If the application doesn't have a corrosion or contamination problem, carbon steel chain — at 5–10x the working load per dollar — is almost always the better spec.
Available Sizes: ANSI #25 Through #60
As of this writing, LILY Bearing stocks stainless roller chain in five standard ANSI trade sizes, #25 through #60. There is no single-pitch stainless #80 or larger currently stocked — #80-equivalent stainless is only available as double-pitch chain, covered further down.
ANSI No. | Pitch | Roller Diameter | Roller Width | Working Load (Stainless) | Working Load (Carbon Steel, Same Size) |
|---|---|---|---|---|---|
#25 | 0.250" | 0.130" | 0.125" | 15 lbf | 140 lbf |
#35 | 0.375" | 0.200" | 0.1875" | 40 lbf | 560 lbf |
#40 | 0.500" | 0.312" | 0.3125" | 95 lbf | 940 lbf |
#50 | 0.625" | 0.400" | 0.375" | 150 lbf | 1,620 lbf |
#60 | 0.750" | 0.469" | 0.500" | 190–230 lbf | 2,470 lbf |
Working loads are pulled directly from current product listings. The #60 stainless range (190–230 lbf) reflects two different constructions carrying different ratings — see the next section. Always check the specific SKU's product page before finalizing a design.
Need a bigger displacement without jumping to #80 pitch? Corrosion-resistant double-pitch chain is stocked in double-pitch equivalents of #40, #50, #60, and #80 (pitches of 1.0", 1.25", 1.5", and 2.0"), with working loads of 95, 150, 230, and 390 lbf respectively — useful for slow-speed conveyors where the extra pitch reduces the sprocket and chain part count without needing the strength of standard-pitch #80.
Standard vs. Hollow-Pin Stainless Chain
Not all stainless chain in this catalog is built the same way, and the difference matters if you're mounting attachments.
Standard (solid-pin) construction is the general-purpose option, sold under this catalog's lightweight corrosion-resistant line in #25 through #60. It's the default choice for open conveying and light mechanical transmission where nothing needs to bolt onto the chain itself.
Hollow-pin construction — stocked in #40, #50, and #60 — replaces the solid pin with a tube-shaped pin bored straight through. That hole lets you bolt on attachments (flights, pushers, brackets) directly through the pin instead of welding or riveting a separate attachment link, and lets you reposition attachments without cutting the chain. Pin hole diameters here run 0.157" at #40, 0.202" at #50, and 0.236" at #60. It's the standard choice for conveyor and packaging-line applications where attachment spacing changes between product runs.
The two aren't interchangeable outputs of the same design: hollow-pin #60 in this catalog carries a 230 lbf working load against 190 lbf for the standard #60 — a reminder that "stainless roller chain" isn't one spec, it's a family of them, and the construction matters as much as the trade size.
Where Stainless Roller Chain Belongs
As a corrosion-resistant roller chain, stainless earns its keep in environments where carbon steel — even coated — would fail early:
Food and beverage processing — bottling lines, packaging conveyors, and any equipment subject to daily wash-down with water or mild sanitizers.
Pharmaceutical and medical device manufacturing — cleanroom conveyors where corrosion byproducts or lubricant residue are a contamination risk.
Marine and outdoor equipment — deck winches, dock equipment, and anything exposed to saltwater spray.
Chemical processing — mild acidic or caustic environments where carbon steel would pit within weeks.
Instrumentation and low-load precision drives — where the non-magnetic property matters more than raw strength.
Where It Doesn't Belong
Given the working-load gap shown above, stainless is a poor fit for:
Heavy-duty power transmission — agricultural equipment, industrial gearboxes, and high-torque drives where carbon steel's load capacity per pitch is the whole point.
High-speed drives — most stainless roller chain on the market, including hollow-pin designs, is rated for lower maximum speeds than equivalent carbon steel due to material hardness differences.
Budget-constrained projects with no corrosion exposure — paying for corrosion resistance you don't need, at a fraction of the load capacity, is the single most common misapplication of stainless chain.
Choosing the Right Size
Confirm the sprocket first. Stainless chain must match the pitch of an existing or planned sprocket — pitch, not chain width, is what determines compatibility.
Check working load against actual pull force, not tensile strength. The working load figures above already include a safety margin; don't apply an additional multiplier on top of them unless your engineering standard specifically requires it.
Decide standard vs. hollow-pin before ordering, since switching later means replacing the entire chain, not just adding a link.
If the load exceeds what stainless in the needed size can carry, consider a nickel-plated or zinc-plated carbon steel chain instead — it recovers most of the working load while still resisting light corrosion, at a lower cost than stainless.
FAQ
Does stainless steel roller chain need lubrication?
Less than carbon steel, but not none. Stainless still benefits from a light food-grade or synthetic lubricant at the pin-bushing interface to reduce wear, even though it doesn't need oil for rust prevention the way carbon steel does.
Can I mix a stainless chain with a carbon steel sprocket?
Yes, as long as the pitch and tooth profile match. Mixing materials between chain and sprocket doesn't create a compatibility issue on its own, though the softer stainless will typically wear faster against a hardened steel sprocket than a matched stainless pair would.
Why is the working load so much lower than carbon steel at the same size?
Stainless alloys used in chain manufacturing generally have lower tensile strength than the hardened carbon steel in standard roller chain. On top of that, the austenitic stainless steel used in most chain components isn't hardenable by heat treatment the way carbon steel is, so its surface stays softer even before any wear begins. That trade-off is what buys the corrosion resistance.
Is 304 or 316 stainless used in this chain?
Grade isn't listed on every stainless roller chain product page in this catalog. If your application involves saltwater or aggressive chemical exposure specifically, confirm the grade with the product listing or contact support before ordering, since 316 offers meaningfully better resistance to chlorides than 304.
How do I tell a stainless chain's ANSI size from its part number?
Look for an "SS" suffix after the trade number — a #40 stainless chain is typically listed as "40-SS," #50 as "50-SS," and so on. The number before the suffix is the ANSI trade size and tells you the pitch; the suffix just flags the material, not a different dimension standard.
What's the difference between #40 and #41 roller chain?
Same 0.5" pitch, but #41 is a lighter, riveted-pin design with a meaningfully lower load rating — not a substitute for #40 where strength matters. See our Roller Chain Size Chart for the full dimensional breakdown across all 14 ANSI sizes, including #40 vs. #41.
Get the Right Chain the First Time
Pitch and roller diameter tell you whether a chain fits your sprocket — working load and construction tell you whether it'll survive the application. Get either one wrong and you're either back here reordering, or dealing with premature failure on a line that can't afford downtime.
Browse the full stainless and carbon steel roller chain lineup, including hollow-pin and double-pitch stainless options in the sizes covered above, or check compatible sprockets for the size you've settled on. The sizes here cover the stainless range specifically; for dimensions, capacity, and diagrams across the full 14-size carbon steel ANSI lineup — including #80 and up, which stainless doesn't reach in this catalog — see our Roller Chain Size Chart. For general sprocket-and-chain selection background, see Industrial Chains and Sprockets.
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