RotoPrecision Inc. - Miniature and Instrument Bearings

Open
• Metric 1.0 - 3.0 mm
• Metric 4.0 - 6.0 mm
• Metric 7.0 - 10.0 mm
• Inch.0400" - .7500"

Open Flanged
• Metric 1.0 - 3.0 mm
• Metric 4.0 - 5.0 mm
• Metric 6.0 - 10.0 mm
• Inch .0400" - .5000"

Shielded
• Metric 1.5 - 3.0 mm
• Metric 4.0 - 5.0 mm
• Metric 6.0 - 10.0 mm
• Inch .0469" - .7500"

Shielded Flanged
• Metric 1.5 - 3.0 mm
• Metric 4.0 - 5.0 mm
• Metric 6.0 - 10.0 mm
• Inch .0469" - .5000"

• Assembly and Handling
• Bearing Fatigue Life
• Bearing Types
• Cages
• Internal Geometry
• Limiting Speeds
• Load Ratings
• Materials
• Protective Closures
• Sample Calculation
• Shaft and Housing Fits
• Tolerances

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
SIZE	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. Example: 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". Example: P58 = 0.0005" - 0.0008" (13 - 20 microns)
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). Example: GP7 Additional lubricant options are available.
PACKAGING	-	-	-- V	No Code: Individually sealed plastic or foil packs Packaged in vials

Download PDF Version: Nomenclature.pdf

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