SUS80B — One-Inch Pitch Stainless Sprocket for Extreme Environments

The 25.4 mm pitch — exactly one inch — is the largest standard chain pitch in common use across the stainless roller chain sprocket family at Hangzhou Ever-Power. At this scale, the No.80SS chain carries a breaking load significantly higher than any smaller pitch class, and the SUS80B sprocket that mates with it reflects this: the 40-tooth variant weighs 12.40 kg, with an outside diameter of 338 mm and a hub BD of 107 mm. These are not precision instrument components; they are substantial industrial parts that must withstand continuous high-torque operation while the 304 stainless construction simultaneously holds off the corrosive conditions that would destroy carbon steel in the same installation.

The 25.4 mm pitch also coincides with the ANSI #80 chain standard — one inch pitch is one inch in both metric and inch-standard systems — making the SUS80B the direct stainless equivalent of the widely used ANSI #80 sprocket. This convergence is operationally significant: a great deal of heavy industrial sprocket replacement demand is in this pitch class, because ANSI #80 chain is the workhorse of large-scale industrial conveying, elevator drives, and production machinery throughout manufacturing industry globally. When those carbon steel drives are installed in wet or chemically active environments, the SUS80B is the natural replacement choice.

Hangzhou Ever-Power machines SUS80B sprockets from solid 304 stainless bar across 24 tooth counts from 10T to 40T. All parts are hobbed with dedicated No.80SS tooling, bored to H7 tolerance, and inspected by CMM before dispatch. Keyway, set-screw, duplex, taper-lock, and fully custom configurations are produced on order with no minimum quantity restriction.

Engineering the 1-Inch Pitch: Load Capacity in Stainless

At the 25.4 mm pitch, the structural demands on a sprocket hub are at their most significant within the standard SUS range. The 40T SUS80B with its 107 mm hub BD, 50 mm hub BL, and 75 mm maximum bore is machined from a substantial bar of 304 stainless — not a lightweight component by any measure. The engineering decisions embedded in these hub dimensions reflect the maximum bore at which 304 stainless can sustain the rated chain torque at this pitch class without hub wall failure.

One notable feature of the SUS80B range is the weight step at the 22T mark: from 3.85 kg at 21T to 5.00 kg at 22T, a jump of 1.15 kg caused by the hub BL increasing from 40 mm to 45 mm at the same time as the stock bore increases from 19 to 22 mm. This reflects the need for a longer bearing surface as the bore diameter and transmitted torque both grow at this point in the range. Engineers specifying SUS80B parts in weight-sensitive installations — cantilevered shafts, overhead drives, or equipment near the structural load limit — should account for this step when comparing mid-range tooth counts.

Industry Applications

The SUS80B is the right choice when a drive system needs the load capacity of the one-inch chain pitch class and the operating environment simultaneously rules out carbon steel construction. The list of industries below reflects the intersection of those two requirements — heavy machinery in corrosive or hygiene-regulated surroundings where neither smaller stainless nor larger carbon steel alternatives fully satisfy the specification.

Multi-Strand & OEM Custom Configurations

At the 25.4 mm pitch, duplex No.80SS chain drives are common in applications where the load requirement exceeds the single-strand limit but the installation envelope does not allow a larger pitch class. As a direct chain sprocket OEM manufacturer, we produce SUS80B duplex and triplex sprockets from customer specifications, with the same hobbing precision and bore tolerances applied to the wider tooth face as to standard simplex parts. Split sprockets for on-shaft fitting without disassembly, and reverse-engineered replacements from worn samples, are also produced within our standard lead time framework.