Chain Standards
Standards organizations (such as ANSI) maintain standards for design, dimensions, and interchangeability of transmission chains. For example, the following table shows the principal data of ANSI standard B29.1 (Precision Power Transmission Roller Chains, Attachments, and Sprockets). See the references for full information.
- NOTE: As of 1 January 2002, ANSI/AMSE B29.1 has been incorporated into ASME B29.100.
| ANSI B29.1 roller chain standard sizes | |||||||
| Size | Pitch | Roller diameter | Tensile strength | Working load | |||
|---|---|---|---|---|---|---|---|
| 25 | 0.250 in (6.35 mm) | 0.130 in (3.30 mm) | 781 lb (354 kg) | 140 lb (64 kg) | |||
| 35 | 0.375 in (9.53 mm) | 0.200 in (5.08 mm) | 1,758 lb (797 kg) | 480 lb (220 kg) | |||
| 41 | 0.500 in (12.70 mm) | 0.306 in (7.77 mm) | 1,500 lb (680 kg) | 500 lb (230 kg) | |||
| 40 | 0.500 in (12.70 mm) | 0.312 in (7.92 mm) | 3,125 lb (1,417 kg) | 810 lb (370 kg) | |||
| 50 | 0.625 in (15.88 mm) | 0.400 in (10.16 mm) | 4,880 lb (2,210 kg) | 1,430 lb (650 kg) | |||
| 60 | 0.750 in (19.05 mm) | 0.469 in (11.91 mm) | 7,030 lb (3,190 kg) | 1,980 lb (900 kg) | |||
| 80 | 1.000 in (25.40 mm) | 0.625 in (15.88 mm) | 12,500 lb (5,700 kg) | 3,300 lb (1,500 kg) | |||
| 100 | 1.250 in (31.75 mm) | 0.750 in (19.05 mm) | 19,531 lb (8,859 kg) | 5,072 lb (2,301 kg) | |||
| 120 | 1.500 in (38.10 mm) | 0.875 in (22.23 mm) | 28,100 lb (12,700 kg) | 6,800 lb (3,100 kg) | |||
| 140 | 1.750 in (44.45 mm) | 1.000 in (25.40 mm) | 38,280 lb (17,360 kg) | 9,040 lb (4,100 kg) | |||
| 160 | 2.000 in (50.80 mm) | 1.125 in (28.58 mm) | 50,000 lb (23,000 kg) | 11,900 lb (5,400 kg) | |||
| 180 | 2.250 in (57.15 mm) | 1.460 in (37.08 mm) | 63,300 lb (28,700 kg) | 13,700 lb (6,200 kg) | |||
| 200 | 2.500 in (63.50 mm) | 1.562 in (39.67 mm) | 78,000 lb (35,000 kg) | 16,000 lb (7,300 kg) | |||
| 240 | 3.000 in (76.20 mm) | 1.875 in (47.63 mm) | 112,500 lb (51,000 kg) | 22,250 lb (10,090 kg) | |||
For mnemonic purposes, below is another presentation of key dimensions from the same standard, expressed in fractions of an inch (which was part of the thinking behind the choice of preferred numbers in the ANSI standard):
| Pitch (inches) | Pitch expressed in eighths |
ANSI standard chain number |
Width (inches) |
|---|---|---|---|
| 1⁄4 | 2⁄8 | 25 | 1⁄8 |
| 3⁄8 | 3⁄8 | 35 | 3⁄16 |
| 1⁄2 | 4⁄8 | 41 | 1⁄4 |
| 1⁄2 | 4⁄8 | 40 | 5⁄16 |
| 5⁄8 | 5⁄8 | 50 | 3⁄8 |
| 3⁄4 | 6⁄8 | 60 | 1⁄2 |
| 1 | 8⁄8 | 80 | 5⁄8 |
| Notes: 1. The pitch is the distance between roller centers. The width is the distance between the link plates (i.e. slightly more than the roller width to allow for clearance). 2. The right-hand digit of the standard denotes 0 = normal chain, 1 = lightweight chain, 5 = rollerless bushing chain. 3. The left-hand digit denotes the number of eighths of an inch that make up the pitch. 4. An "H" following the standard number denotes heavyweight chain. A hyphenated number following the standard number denotes double-strand (2), triple-strand (3), and so on. Thus 60H-3 denotes number 60 heavyweight triple-strand chain. |
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A typical bicycle chain uses 40 series chain with a minimum tensile strength of 3,125 pounds (1,417 kg) and a working load of 810 lb (367 kg). The width of the chain is variable, and does not affect the load capacity.
Read more about this topic: Roller Chain
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