- GEMEC　|　CHINA

Angular contact ball bearing

Main Features:
A)　Can bear radial load and one direction axial load, used in pairs.
B)　Normal contact angle:15°（C）, 25°（AC）
C)　15°is superior to 25°on running speed and radial loading
　　capacity.25°is superior to 15°on axial loading.

Typical series:718 series,719 series,70 series,72 series
Standard configuration:nylon cage (bakelite cage), steel ball
Main application:machine spindle bearing, power head spindle
Standard accuracy:P5,P4,P4S(P2)
Main lubrication:grease lubrication

Cylindrical roller bearing

Main Features:
A)　Can bear larger radial force, but cannot bear axial load.
B)　Two kinds of cylindrical roller bearings: single-row and double-row.
　　NN series for machine tool spindle inner hole with 1:12 taper; outer ring one with oil
　　groove (W33) and no oil groove (without suffix);
　　N series inner hole straight hole and K (1:12), the outer ring without oil groove oil hole
　　(special lubrication needs special design).

Typical series:NN30 series, N10 series
Main application:machine tool spindle
Standard configuration:COPPER cage (PPS cage) for NN series,COPPER cage (PPS cage) for NN series,
Standard accuracy:UP(P4), SP(P5)

Both-way thrust angular
contact ball bearing

features:
A)　The nominal outside diameter of this type of bearing is the same as that of matching NN series,
　　but the tolerance is small, and there is gap with the shell, so it cannot bear radial load.
B)　The 2344 series bearings are split version, consisting of two inner rings (shaft ring), an outer ring (seat ring),
　　a spacer ring, two sets of steel balls and retainer components, with a contact angle of 60°,
　　which can withstand larger both-way axial load, with high axial rigidity and low rotating speed capacity.
　　Its capacity of loading is better than BTM series.
C)　BTM series bearings are inseparable version, can be used in pairs (only in DB matching),
　　with contact angles of 30° (A) and 40 ° (B),
　　can withstand bearing both-way axial load and with high rotational speed.
　　Its capacity of running speed is better than 2344 series.

Typical series: 2344 series, BTM-B series (high speed thrust angular contact ball bearing)
Main application: machine tool spindle bearing
Standard configuration: Copper retainer (2344 series), nylon retainer (BTM series)
Standard accuracy: UP (P4), SP (P5)