RotoPrecision Miniature and Instrument Bearings

Nomenclature

The following table outlines the part numbering system used to identify RotoPrecision miniature and instrument bearings. For additional information, please contact one of our Application Support Representatives. Here are some example part numbers we will use to explain the numbering system:


Ex.1: SM-840W30ZZ G7
Ex.2: SFI-R2DDKA7P58 G7

GROUP EX. 1 EX. 2 EXPLANATION
Material S S S
C
AISI Stainless steel (440C)
Chrome alloy steel (52100)
Type M FI M
FM MH
I
FI IH
Radial Metric
Radial Metric Flanged
Metric Angular Contact
Radial Inch
Radial Inch Flanged Inch
Angular Contact
Type 840W30 R2 Metric Series
• First one or two digits indicate the O.D. in mm
• Second two digits indicate the I.D. in 1/10mm
W followed by two digits indicates the width in 1/10mm

Inch Series
• First one or two digits indicate the O.D. in 16ths, except when the basic size is preceded by R. Then the digit indicates the I.D. in 16ths.

• Next two or three digits indicate the I.D. in a fraction of an inch; the first of these being the numerator and the remaining being the denominator. This does not apply when the basic size is preceded by R or M.

W following basic size indicates special width in 0.0001".
Special
Features
- - X Special features
(can be followed by a numerical character)
Enclosures ZZ DD ZZ
DD
LL
EE
Double metallic shields
Double rubber shields
Double glass reinforced PTFE seals
Extended inner ring both sides
Cage Options - K -
K
R
H
No Code: Land piloted, crown or ribbon cage
High speed phenolic cage
Ribbon cage specified
Crown cage specified
ABEC
Tolerances
- A7 -
A
No Code: ABEC 3 or better
A followed by a single digit indicates the minimum ABEC rating.
(Ex. A7 = Select grade ABEC 7 or better.)
Radial
Play
- P58 -
P
No Code: 0.0002" - 0.0005" (5 - 13 microns)
P followed by two or three digits indicates the radial play values in 0.0001".
(Ex. P58 = 0.0005" - 0.0008")
Lubrication G7 G7 G7
O7
P
Synthetic grease: low torque, -40°F to 300°F
Synthetic oil: general purpose, -65°F to 300°F
Grease plate:  insert P between the letter and the numeric character (Ex. GP7)
* Additional lubricant options are available. 
Packaging - - -
V
No Code: Individually sealed plastic or foil pack
V Packaged in vials

 

Download PDF Version: Nomenclature.pdf

For any additional information or for immediate assistance,
please contact Application Support.
 


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