7000B

Angular Contact Ball Bearings

Product Guide —

Contact Angle, Cage Type, Matching Methods & Applications

Supplied by TA Bearing

1. Product Overview

Angular contact ball bearings are designed to carry combined radial and axial loads simultaneously, with a single contact angle that directs thrust in one direction. TA Bearing supplies a full range — single row (70, 72, 73, 74 series), thin-section (718, 719), double row (32, 33, 52, 53), four-point contact (QJ), and matched pairs — in standard and custom specifications.

Because a single bearing supports axial force in one direction only, single-row types are commonly mounted in pairs (DB / DF / DT) or used as universal matching sets to handle bidirectional loads and preload arrangements.

 

2. Contact Angle Designations

The contact angle determines the balance between axial load capacity and high-speed performance. TA Bearing offers three standard designations:

Designation	Contact Angle	Dynamic Cr (ref.)	Feature
C	15°	Highest	High speed, low axial load
AC	25°	Medium	Balanced speed & load
B	40°	Lowest	Heavy axial load

 

· As the contact angle increases (C → AC → B), axial capacity rises while limiting speed falls.

· Radial load capacity remains broadly similar across the three angles.

· Example: 7210C, 7210AC, 7210B share the same dimensions but differ in contact angle.

 

3. Cage Types & Designations

TA Bearing provides four cage options. The cage material affects speed capability, temperature resistance and application fit — not the basic load ratings:

 

Cage Type	TA Bearing Value	Common Suffix	Notes
Stamped steel	Steel	J / (none)	Default; robust, all sizes
Nylon (PA66, GF-reinforced)	Nylon PA66	P / TN / TN9	Quiet, light, D ≤ 250 mm
Machined brass	Brass	M	Heavy load, large sizes
Phenolic (bakelite)	Phenolic (TA)	T / TA	High speed, precision; C & AC only

 

· Steel cage:

the universal default; TA Bearing lists it without a suffix (e.g. 7210C).

· Nylon PA66 (TN / TN9 / BTN):

glass-fiber reinforced, quieter running.

· Brass cage (M):

for heavy loads and larger bearings, e.g. 7312ACM.

· Phenolic / bakelite (TA):

resin cloth laminate, used in thin-section and high-speed types, e.g. 7203ACTA.

 

Matching Methods (Paired Arrangements)

 

Single-row angular contact bearings are often paired to support axial loads in both directions and to apply preload. TA Bearing supplies matched sets as follows:

Arrangement	Code	Description
Back-to-back	DB	Two bearings opposed, rigid, handles reversing thrust
Face-to-face	DF	Two bearings facing, self-aligning tendency
Tandem	DT	Axial load shared in one direction, doubled capacity
Universal pair	DU / SU	Interchangeable, any arrangement without adjustment

 

· Preload (light / medium / heavy) is set during pairing to improve stiffness and running accuracy.

· Example:

7210C DU — a universal matched pair from TA Bearing.

 

5. Application Industries

TA Bearing angular contact ball bearings are widely used where combined loads and controlled stiffness are required:

Industry / Equipment	Typical Series / Config.
Machine tool spindles	718, 719 (thin-section, phenolic cage)
Pumps & compressors	72, 73 series; DB / DF pairs
Gearboxes & transmissions	72, 73, double row 32 / 33
Electric motors & fans	70, 72 series, steel or nylon cage
Rolling mills & heavy machinery	73, 74 series, brass cage
Agricultural & conveying equipment	Double row 52 / 53, 2RS variants

 

6. Selection Summary

· Choose an angular contact bearing in four steps:

· Contact angle: C for speed, AC balanced, B for heavy axial load.

· Cage: Steel (default), Nylon (quiet), Brass (heavy), Phenolic (high-speed).

· Arrangement: Single, DB / DF / DT pair, or universal matched set.

· Sealing: Open (standard), ZZ or 2RS for double-row types.

 

For the full part-number list with load ratings, limiting speeds and weights, contact TA Bearing — we deliver standard and custom angular contact ball bearings to meet your application needs.