Angular Contact Bearing Options

Applications have different bearing needs. Sometimes these requirements go above typical precision bearing specs.

For example, some may need:

• Heavier load-carrying capabilities
• Faster speeds
• More flexibility for temperature fluctuations
• So on and so forth

Applications with these needs probably won’t be satisfied by our stocked and “ready-to-ship” GMN angular contact bearings. That’s why we offer a variety of options to choose from in our angular contact bearing product line.

Our goal is to make sure every machine and application has the right precision angular contact bearing.

Find Your (Bearing) Match

Understanding our product label and part number will help spindle rebuilders, distributors and engineers recognize all the custom options available for order.

All customized options that aren’t widely available are manufactured at the GMN Germany headquarters and shipped to us in Houston, Texas. Our shipping turnaround times are very fast, usually the best turnaround times in the industry.

Angular Contact Bearing Options

–	No prefix: 52100 Bearing Steel (Balls & Rings)
HY	Ball Material: Ceramic (Si3N4) Rings: 52100 Bearing Steel
M	High Temperature Steel*
N	High Nitrogen Steel*

*Available on Request

S	Standard bearing series, single relief on outer ring
SM	High speed large ball series, similar to S series but supports higher speeds
KH	Smaller balls & supports the highest speeds (for it’s size). Only series that can be ordered with seals.
BNT	Separable bearing, similar to S series performance
BHT	Separable bearing, similar to SM series performance

C	15° Contact Angle
E	25° Contact Angle
Custom Contact Angle	18°

6002	Designation of dimensions series and bore diameter

2RZ	Seals on both sides of the bearing (KH Series only)

TA	Laminated phenolic resin cage guided on outer ring (standard)
TXM	Molded plastic cage guided on outer ring, ball retaining

–	No lubrication
L252	Lubrication identifier (Ex. Turmogrease HS L252)

–	Standard Lubrication
A	Oil lubrication hole through outer ring on open side
AB	Oil lubrication hole through outer ring on closed side
L	Oil lubrication hole through outer ring on open side, outer ring oil groove with O-ring seals
LB	Oil lubrication hole through outer ring on closed side, outer ring oil groove with O-ring seals
AG	Grease lubrication hole through outer ring on open side

UL	Universal matching: Light preload
UM	Universal matching: Medium preload
US	Universal matching: Heavy preload
UV	Universal matching: Special preload
DF	Face-to-Face arrangement
DB	Back-to-Back arrangement
DT	Tandem arrangement

P4	European tolerance class: Matches to P4S per DIN 628-6, similar to ABEC 7
P2	European tolerance class: Matches to ABEC 9
A7	ABEC 7 per ABMA standards Similar to P4
A9	ABEC 9 per ABMA standards Similar to P2
HG	GMNs standard for high precision. Defined as higher than P4, but lower than UP (below)
UP	GMNs own standard for ultra precision. Defined as Higher than HG, but lower than P2

R	High point mark for radial runout for both inner and outer rings
Ri	High point mark for radial runout on inner ring
Ra	High point mark for radial runout on outer ring

X	Grading of Bore & Outer Diameter

–	One Bearing
D	Two Bearings
T	Three Bearings
Q	Four Bearings

S1	Operating temp up to 392°F (200°C)
S2	Operating temp up to 482°F (250°C)
S3	Operating temp up to 572°F (300°C)