20B Roller Chain — Strand-Count Comparison
20B is ISO 606 B-series roller chain, 1.25" pitch (31.75 mm). Compare all strand variants below — pitch and outer dimensions are identical across strands; load capacity scales roughly N× with strand count.
Shared Dimensions (all strands)
ISO 606 pins these dimensions to manufacturer-independent values — single- and multi-strand variants of 20B share identical pitch, roller, pin, and plate geometry.
| Designation | 20B |
| Pitch | 1.25" (31.75 mm) |
| Roller diameter | 0.75" |
| Width between plates | 0.77" |
| Pin diameter | 0.401" |
| Plate thickness | 0.173" |
| Plate height | 1.024" |
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Per-Strand Load & Mass
Load capacity and mass scale roughly linearly with strand count. The sprocket must match (multi-strand sprockets carry N parallel tooth tracks). A dash (—) means the manufacturer doesn't publish that value for that strand variant.
Same-Pitch Cross-Series
Other chain families with identical pitch but different plate geometry — NOT directly interchangeable, but commonly mistaken for each other. The sprocket fits the pitch; the chain envelope differs.