Double Pitch Sprockets American Standard
Double pitch sprockets are designed for use with American standard double-pitch roller chain to ANSI B29.100 β chain with twice the pitch of the equivalent standard ANSI chain but the same roller diameter and inner width. The chain number designation reflects this: “2040” means double pitch of #40 (Β½β³ Γ 2 = 1β³ pitch), “2060” means double pitch of #60 (ΒΎβ³ Γ 2 = 1Β½β³ pitch). Double pitch chain runs on alternating rollers β every other pin carries a roller, and intermediate pins are plain. Double pitch sprockets have tooth spacing to match this alternating roller pattern.
2040 β 2160
Chain Number Range
1β³ β 3β³
Pitch Range
Z=6 β 30
Tooth Count Range
ANSI B29.100
Standard
Double Pitch Sprockets β American Standard
The commercial justification for double pitch chain and sprockets is simple: for a given conveyor speed and chain pull, double pitch chain costs significantly less per metre than standard pitch chain, and the larger pitch circle diameter for a given tooth count means sprockets are cheaper to produce at large diameter. For a low-speed, light-load conveyor carrying 500 kg/m at 0.3 m/s, 2040 chain with a 12-tooth sprocket is a cost-effective alternative to #40 chain with a 24-tooth sprocket β the pitch circle diameter and chain pull capacity are equivalent, but the chain and sprocket cost less.
Double pitch sprockets are available in two tooth forms: Type A (standard tooth) β every tooth engages a roller; and Type B (alternate tooth / extended pitch) β only alternate teeth are full height, with the intermediate teeth reduced to clear the plain pins of the double pitch chain. Type B sprockets produce smoother engagement at higher speeds. The chain number, tooth count and type must match exactly β a Type A double pitch sprocket will not run smoothly with double pitch chain above approximately 50 rpm.
π Double pitch chain number decoder
| Chain No. | Pitch (in) | Roller Γ (in) | = Base ANSI |
|---|---|---|---|
| 2040 | 1β³ | 0.312β³ | #40 roller |
| 2050 | 1-1/4β³ | 0.400β³ | #50 roller |
| 2060 | 1-1/2β³ | 0.469β³ | #60 roller |
| 2080 | 2β³ | 0.625β³ | #80 roller |
| 2100 | 2-1/2β³ | 0.750β³ | #100 roller |
| 2120 | 3β³ | 0.875β³ | #120 roller |
Type A vs Type B Double Pitch Sprockets β Which Do You Need?
The tooth form selection for double pitch sprockets depends on the chain speed and the smoothness of engagement required. Using the wrong type causes accelerated chain and sprocket wear and is a very common installation error.
Type A β Standard Tooth (Every Tooth Engages)
Max speed: β€50 RPM at sprocket
Every tooth is full height. On each revolution, alternate teeth engage rollers and the teeth between them pass through the plain pin gaps in the chain. At low speeds (below 50 RPM), the impact as teeth engage is negligible. At higher speeds the polygon effect at alternate teeth causes a noticeable vibration β use Type B.
β Gravity conveyors, slow pallet conveyors, grain auger drives, drag-chain bucket elevators below 50 RPM
Type B β Alternate Tooth (Extended Pitch Tooth)
Recommended: 50β300 RPM at sprocket
Alternate teeth are full height (engage rollers); intermediate teeth are reduced to plain-pin clearance height only. This means the chain engages only on alternate teeth β effectively the sprocket runs as if it had half the tooth count from an engagement frequency standpoint. This eliminates the polygon effect caused by alternate-tooth engagement and produces smooth, quiet running up to moderate speeds.
β Slat conveyors, parts washing, bottle conveyors, light assembly conveyors β any double pitch drive above 50 RPM
Critical: A Type A sprocket on a double-pitch chain drive running above 50 RPM will generate significant vibration and accelerate chain roller wear within weeks. Always specify Type B for conveyor applications β only specify Type A for confirmed ultra-low-speed applications below 50 RPM. When in doubt, specify Type B.
Key: Z = tooth count Β |Β de = tip diameter (in) Β |Β dp = pitch circle diameter (in) Β |Β Bore max = max stock bore (in) Β |Β H = hub width (in) Β |Β Type: A = all teeth full height, B = alternate tooth form
Double Pitch Sprocket Specifications
2040 Β |Β Pitch 1β³ / 25.40 mm Β |Β Roller Γ 0.312β³ / 7.94 mm
| Z | Type | de (in) | dp (in) | Bore max (in) | H (in) |
|---|---|---|---|---|---|
| 6 | A | 2.10 | 1.934 | ΒΎ | β |
| 8 | A | 2.72 | 2.563 | ΒΎ | β |
| 10 | A / B | 3.35 | 3.196 | 1 | β |
| 12 | A / B | 3.97 | 3.830 | 1ΒΌ | β |
| 15 | B | 4.93 | 4.775 | 1Β½ | β |
| 18 | B | 5.90 | 5.727 | 1ΒΎ | β |
| 25 | B | 8.10 | 7.959 | 2 | β |
| 30 | B | 9.67 | 9.549 | 2 | β |
2060 Β |Β Pitch 1Β½β³ / 38.10 mm Β |Β Roller Γ 0.469β³ / 11.91 mm
| Z | Type | de (in) | dp (in) | Bore max (in) | H (in) |
|---|---|---|---|---|---|
| 6 | A | 3.12 | 2.893 | ΒΎ | 1ΒΌ |
| 8 | A | 4.06 | 3.834 | 1 | 1ΒΌ |
| 12 | A / B | 5.95 | 5.745 | 1Β½ | 1ΒΌ |
| 18 | B | 8.86 | 8.590 | 2ΒΌ | 1ΒΌ |
| 25 | B | 12.15 | 11.938 | 2Β½ | 1ΒΌ |
2080 Β |Β Pitch 2β³ / 50.80 mm Β |Β Roller Γ 0.625β³ / 15.88 mm
| Z | Type | de (in) | dp (in) | Bore max (in) | H (in) |
|---|---|---|---|---|---|
| 6 | A | 4.20 | 3.868 | 1 | 1Β½ |
| 8 | A | 5.45 | 5.125 | 1ΒΌ | 1Β½ |
| 12 | A / B | 7.95 | 7.659 | 2 | 1Β½ |
| 18 | B | 11.80 | 11.454 | 3 | 1Β½ |
| 25 | B | 16.15 | 15.918 | 3Β½ | 1Β½ |
2050, 2100, 2120, 2160 also available β contact us. Specify chain number, tooth count, Type A or B, and bore size in inches. All bores stock bore β machined to your shaft diameter on order.
Matching Chain & Related Products
Leaf Chains
BL and LH series leaf chains for forklift masts, industrial door drives, and hoist mechanisms. Tensile ratings from 11 kN to over 1,600 kN.
Engineering Chains
Welded steel, cast iron, and forged chains for heavy-duty industrial conveying in steel mills, cement plants, mining, and chemical processing.
Stainless Steel Chains
SUS304 and SUS316L roller chains for food, pharmaceutical, and chemical environments. Suitable for washdown, elevated temperature, and corrosive media.
Agricultural Chains
CA, CC, and corn-chain series for combine harvesters, cotton pickers, balers, and spreading equipment. ISO 487 / ASME B29.100 standard.
Additional information
| Editor | Cxm |
|---|
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