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FAG toroidal roller bearings, C 31 series: dimensions and part numbers

The FAG C 31 series of toroidal roller bearings brings together 42 part numbers in our catalogue across 21 basic sizes, from C 3132 to C 31/670: bore (d) from 160 to 670 mm and outside diameter (D) from 270 to 1090 mm. Every part number in the table links to its own page, where you can request a quote via WhatsApp or email.

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C 31 series size chart

FAG C 31 series toroidal roller bearings: catalog part numbers and ISO 15 boundary dimensions in mm.
Basic designation	d	D	B	Same size	Variants
C 3132	160	270	86	160x270x86	C3132-XL-K-M1B C3132-XL-M1B
C 3136	180	300	96	180x300x96	C3136-XL-K-M C3136-XL-M
C 3140	200	340	112	200x340x112	C3140-XL-K-M C3140-XL-M
C 3144	220	370	120	220x370x120	C3144-XL-K-M C3144-XL-M
C 3148	240	400	128	240x400x128	C3148-XL-K-M C3148-XL-M
C 3152	260	440	144	260x440x144	C3152-XL-K-M C3152-XL-M
C 3156	280	460	146	280x460x146	C3156-XL-K-M C3156-XL-M
C 3160	300	500	160	300x500x160	C3160-XL-K-M C3160-XL-M
C 3164	320	540	176	320x540x176	C3164-XL-K-M C3164-XL-M
C 3168	340	580	190	340x580x190	C3168-XL-K-M C3168-XL-M
C 3176	380	620	194	380x620x194	C3176-XL-K-M C3176-XL-M
C 3180	400	650	200	400x650x200	C3180-XL-K-M C3180-XL-M
C 3184	420	700	224	420x700x224	C3184-XL-K-M C3184-XL-M
C 3188	440	720	226	440x720x226	C3188-XL-K-M1B C3188-XL-M1B
C 3192	460	760	240	460x760x240	C3192-XL-K-M C3192-XL-M
C 31/500	500	830	264	500x830x264	C31/500-XL-K-M C31/500-XL-M
C 31/530	530	870	272	530x870x272	C31/530-XL-K-M C31/530-XL-M
C 31/560	560	920	280	560x920x280	C31/560-XL-K-M1B C31/560-XL-M1B
C 31/600	600	Dimension not yet confirmed	Dimension not yet confirmed		C31/600-XL-K-M1B C31/600-XL-M1B
C 31/630	630	1030	315	630x1030x315	C31/630-XL-K-M1B C31/630-XL-M1B
C 31/670	670	1090	336	670x1090x336	C31/670-XL-K-M1B C31/670-XL-M1B

Every part number in this series carries a suffix after the basic designation. The most frequent FAG suffixes, with the number of sizes they appear in: K (21), XL (21), M (15), and M1B (6). The suffix defines the variant (sealing, cage, internal clearance or other options): to request a quote, send us the full part number marked on the bearing, the box or the drawing.

How to read the part number: C 31 gives the bearing type and the dimension series; for the same bore, each series has a different outside diameter and width. What follows is the bore code: from 04 upwards, multiplying by 5 gives the bore in millimetres (in the C 3132, 32 × 5 = 160 mm); after a slash, the bore is given directly in millimetres (in the C 31/500, 500 mm).

The table gives the boundary dimensions of each basic designation according to ISO 15, in millimetres: d is the bore, D the outside diameter and B the width. These are standardised dimensions: the same basic designation has the same dimensions in every brand. Where a dash appears, the dimension has not been validated yet: we confirm it when we quote.

If the part number on the bearing can no longer be read, measure the bore, the outside diameter and the width, and find the matching row: with that size and the variant you need, we will quote it.

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