Martin chain #25 · E-17
25B21SS
Exact stock sprocket record from Martin's official Roller Chain Sprockets catalog.
Published catalog evidence
Exact source record
- Catalog number
- 25B21SS
- Chain designation
- 25
- Chain pitch
- 0.25"
- Number of teeth
- 21
- Material context
- stainless steel
- Sprocket style
- single stainless stock sprockets
- Published row text
- 21 25B21SS 1 .809 B .25 .875 1 .375 .625 .28
Verification boundary
What still needs to match
Chain and strand countConfirm ANSI/ISO chain standard, pitch, roller width, and simplex/duplex/triplex arrangement.
Bore and hub systemVerify stock/finished bore, QD or taper-bushing size, hub style, keyway, setscrews, and shaft fit.
Material and teethConfirm steel/stainless material, hardened-tooth suffixes, corrosion requirements, and tooth count.
DutyCheck speed, horsepower, alignment, lubrication, shock loading, and current manufacturer limits.
Related catalog parts
Same chain family, nearby tooth count
Chain #2525B2121 teeth · single stock sprocketsChain #2525B2020 teeth · single stock sprocketsChain #2525B2222 teeth · single stock sprocketsChain #2525B20SS20 teeth · single stainless stock sprocketsChain #2525B22SS22 teeth · single stainless stock sprocketsChain #2525B1919 teeth · single stock sprocketsChain #2525B2323 teeth · single stock sprocketsChain #2525B19SS19 teeth · single stainless stock sprockets