Bearing Cross Reference Chart: Read the full model number, Not Just the Size

General MRO, Industrial Briefs

October 25, 2026

“Bearing cross reference” is one of the phrases people search most when a part number stops making sense. It’s also one of the most misunderstood. A bearing cross reference chart will happily tell you an SKF 6211 equals an NSK 6211. What it won’t tell you is whether the one you’re about to order has the same seals, the same clearance and the same cage as the one coming out of the machine.

Here’s how to read a cross reference properly, with real pairs from our own shelf. (If your number is gone altogether, start with how to replace a discontinued bearing.)

What a bearing cross reference chart actually matches

A cross reference chart matches the basic number: the series and bore code that define the outside envelope. For standard metric bearings, that envelope is the same no matter who made it. A 6211 deep groove ball bearing is 55 x 100 x 21 mm from every major brand.

That’s the easy half. The hard half is everything after the basic number: the suffix. Each manufacturer writes the same features with different letters, and that’s where a bearing interchange goes right or wrong.

The suffixes that trip people up

Common equivalents across four major brands. Always confirm against the manufacturer’s catalog for critical applications, because designs change and some features don’t map one-to-one.

Feature	SKF	FAG / Schaeffler	NSK	NTN
Two contact seals	2RS1 / 2RSH	2RSR	DDU	LLU
Two metal shields	2Z	2ZR	ZZ	ZZ
Greater-than-normal clearance	C3	C3	C3	C3
Tapered bore (1:12)	K	K	K	K
Spherical roller lube groove and holes	W33	standard on E1 designs	E4	D1

Read a number with that table in mind and the code starts talking. SKF 6211-2Z/C3 and Nachi 6211ZZE C3 are both 55 mm bore deep groove ball bearings with two shields and C3 clearance. Different letters, same job. Both are on our shelf right now.

The brands with their own numbering

Older American brands didn’t always use the 6000-series system, and a basic bearing cross reference chart will often miss them:

MRC drops the leading 6. An MRC 208 is a 6208 envelope; an MRC 307 is a 6307.
Fafnir does the same with its own suffixes. A Fafnir W206PP shares a 6206’s 30 x 62 mm envelope; a Fafnir M306K matches a 6306 in precision.

If the number in your hand has three digits where you expected four, check the size before you assume it’s obsolete. Our bearing size chart lists the standard dimensions for the common series.

Inch bearings and tapered sets

Tapered roller bearings deserve their own warning. Many are inch-dimensioned and sold as two parts: the cone (inner ring with rollers) and the cup (outer ring). The numbers are separate, like Timken 387/382B, where 387 is the cone and 382B is a flanged cup. A cross reference has to match both halves, and the cup’s flange or width can differ even when the cone is identical.

Metric tapered bearings, like a FAG 32222-A, follow ISO numbering and cross over cleanly between brands. Inch sets follow industry numbering that most major brands share, but always check the cup.

Why two charts can disagree

Search for a bearing interchange online and you’ll sometimes find two charts giving different answers. Usually it’s one of three things: one chart is matching only the basic number and ignoring the suffix; one is out of date after a brand changed its design code; or one is a distributor’s chart quietly steering you toward the brand it sells. When charts disagree, go back to the caliper and the manufacturer’s own catalog. The bearing in your hand is the only source that can’t be wrong about its own size.

Where cross references go wrong

Ignoring precision class. A spindle bearing marked P4 or ABEC 7, like the angular contact bearings in machine tool spindles, isn’t interchangeable with a general-purpose bearing of the same size, even though the chart says “equivalent.”
Swapping seals for shields. Fine on a clean conveyor; a problem in a washdown area.
Installing it wrong. The right bearing can still fail early; on thrust bearings, washer orientation is the classic mistake. See which washer goes where.
Dropping C3. On a hot electric motor shaft, normal clearance can run too tight.
Mixing cage materials at high speed or high temperature.
Trusting a chart over a caliper. If the size doesn’t match, the chart is wrong for your bearing, whatever it says.

A three-step check before you order

Match the envelope: bore, OD and width.
Translate every suffix using the table above or the maker’s catalog.
Confirm the application: speed, temperature, contamination and precision.

Do those three and a bearing cross reference chart becomes a shopping list, not a guess.

Find the equivalent on our shelf

We carry more than 50,000 bearings from SKF, FAG, NSK, NTN, Timken, MRC, Fafnir, Nachi, RHP and others, so the equivalent you need is often already here. One example: RHP 22309 EMW33 C3, a 45 mm bore spherical roller bearing with the lube groove and C3. Every listing shows the actual unit and its condition.