Datasets:

referencesource
/

ansi-to-iso-roller-chain-cross-reference

ansi_chain_number string	ansi_pitch string	ansi_roller_diameter string	ansi_width_between_roller_link_plates string	bs_din_chain_number string	bs_din_pitch string	bs_din_roller_diameter string	bs_din_width_between_roller_link_plates string	derived_fields list	id string	iso_a_series_number string	source string	source_quote string	url string	verified_fields list
40	0.500	0.312	0.312	08B	0.500	0.335	0.305	[ "ansi_chain_number", "bs_din_chain_number" ]	40	08A	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P Roll dia. W T H h D 40 0.500 0.312 0.312 0.060 0.472 0.409 0.156	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/40/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates", "iso_a_series_number" ]
50	0.625	0.400	0.375	10B	0.625	0.400	0.380	[ "ansi_chain_number", "bs_din_chain_number" ]	50	10A	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P Roll dia. W T H h D 50 0.625 0.400 0.375 0.080 0.591 0.512 0.200	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/50/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates", "iso_a_series_number" ]
60	0.750	0.469	0.500	12B	0.750	0.475	0.460	[ "ansi_chain_number", "bs_din_chain_number" ]	60	12A	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P R W T H h D 60 0.750 0.469 0.500 0.094 0.713 0.614 0.234	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/60/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates", "iso_a_series_number" ]
80	1.000	0.625	0.625	16B	1.000	0.625	0.670	[ "ansi_chain_number", "bs_din_chain_number" ]	80	16A	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P Roll dia. W T H h D 80 1.000 0.625 0.625 0.125 0.949 0.819 0.312	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/80/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates", "iso_a_series_number" ]
100	1.250	0.750	0.750	20B	1.250	0.750	0.770	[ "ansi_chain_number", "bs_din_chain_number" ]	100	20A	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P R W T H h D 100 1.250 0.750 0.750 0.156 1.185 1.024 0.375	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/100/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates", "iso_a_series_number" ]
120	1.500	0.875	1.000	24B	1.500	1.000	1.000	[ "ansi_chain_number", "bs_din_chain_number" ]	120	24A	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P R W T H h D 120 1.500 0.875 1.000 0.187 1.425 1.228 0.437	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/120/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates", "iso_a_series_number" ]
140	1.750	1.000	1.000	28B	1.750	1.100	1.220	[ "ansi_chain_number", "bs_din_chain_number" ]	140	null	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P R W T H h D 140 1.750 1.000 1.000 0.219 1.661 1.433 0.500	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/140/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates" ]
160	2.000	1.125	1.250	32B	2.000	1.150	1.220	[ "ansi_chain_number", "bs_din_chain_number" ]	160	null	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P R W T H h D 160 2.000 1.125 1.250 0.250 1.898 1.638 0.562	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/160/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates" ]
200	2.500	1.562	1.500	40B	2.500	1.550	1.500	[ "ansi_chain_number", "bs_din_chain_number" ]	200	null	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P R W T H h D 200 2.500 1.562 1.500 0.312 2.374 2.047 0.781	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/200/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates" ]
240	3.000	1.875	1.875	48B	3.000	1.900	1.800	[ "ansi_chain_number", "bs_din_chain_number" ]	240	null	https://www.ustsubaki.com/wp-content/uploads/tsubaki-roller-chain-catalog-compressed.pdf	P R W T H h D 240 3.000 1.875 1.875 0.375 2.850 2.457 0.937	https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/240/	[ "ansi_pitch", "ansi_roller_diameter", "ansi_width_between_roller_link_plates", "bs_din_pitch", "bs_din_roller_diameter", "bs_din_width_between_roller_link_plates" ]

ANSI roller chain sizes and their ISO 606 A-series and BS/DIN B-series counterparts

Canonical, always-current version: https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/ Machine-readable: https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/data.json — this mirror is a point-in-time copy.

Last verified: 2026-10-19
Stale after: 2028-08-31 (past this date, prefer the canonical copy — it re-verifies on a cadence this snapshot does not)
Records: 10

Industrial roller chain is sold under two numbering systems that look interchangeable and are not. The American system numbers chains 40, 50, 60 and so on, in eighths of an inch of pitch. The British/European system numbers them 08B, 10B, 12B. ISO 606 covers both: its A series is the American chain under a metric name (ANSI 40 is ISO 08A -- the same chain), and its B series is the British chain, which shares the pitch but is a different chain, with a different roller diameter and a different inner width, needing its own sprockets. Somebody replacing chain or matching a sprocket across the two systems has to know which of those two relationships they are looking at, and no catalog states it in one place: manufacturers print an ANSI dimensional table and a separate BS/DIN dimensional table in the same document, never cross-referenced, and the pitch match has to be worked out by eye. Each record here is one ANSI chain number with its pitch, roller diameter and inner width; its ISO 606 A-series name where a publisher states one; and the BS/DIN B-series chain that shares its pitch, with that chain's own pitch, roller diameter and inner width printed alongside, so the difference is visible rather than asserted. Answers 'what is the metric equivalent of ANSI 40 chain', 'is BS 08B the same as ANSI 40', 'ANSI 40 vs 08A vs 08B', 'roller chain size conversion chart'. In scope: the ANSI sizes that the source catalog prints with a roller diameter and that have a B-series chain of the same pitch. Out of scope, and why: ANSI 25 and 35, which are rollerless -- the catalog prints a bushing diameter for them, not a roller diameter, so there is no like-for-like comparison to make; ANSI 41, which has no single-line standard dimension row in the source; and ANSI 180, whose 2 1/4 inch pitch has no B-series counterpart in the source.

Provenance — what every record carries

Every record carries source (the URL the value was read from) and source_quote (a verbatim quote from that page stating it). A value you cannot check against its page is indistinguishable from an invented one; these can all be checked. Each record is also individually addressable on the canonical site at its url.

Licence position

Manufacturer catalog data; cite source, do not reproduce the whole table -- take the individual dimension facts and the attributed quote, not the document

Facts are not copyrightable; what this dataset takes from each source is a fact plus a short attributed quote linking back to the page that states it.

Sources

Fields

See any record in data/records.jsonl — field names are self-describing, and the canonical page for each record renders them with labels: https://referencesource.org/ansi-to-iso-roller-chain-cross-reference/

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