PNA 12/28

PNA 12/28

Alignment needle roller bearing, with an inner ring

Alignment needle roller bearings are self-aligning and offer a compact solution in applications where less space is available.

Owing to their large number of rollers, they have a high load carrying capacity. Their internal design, where a convex outer ring meets two concave seating rings encased in a drawn sleeve, enables the bearings to compensate for initial errors of alignment. Bearings with an inner ring are used for applications where the shaft cannot be hardened and ground.

High radial load carrying capacity
Accommodate static initial misalignment
Low cross-sectional height

Dimensions

d	12 mm	Bore diameter
D	28 mm	Outside diameter
B	12 mm	Width
F	15 mm	Raceway diameter inner ring
D₁	24.5 mm	Shoulder diameter sleeve
r	min.0.8 mm	Chamfer dimension sheet steel sleeve
r_1,2	min.0.3 mm	Chamfer dimension inner ring
s	max.0.5 mm	Permissible axial displacement from the normal position of one bearing ring relative to the other

Abutment dimensions

d_a	min.14 mm	Smallest permissible abutment diameter shaft
D_a	min.23.5 mm	Smallest permissible abutment diameter housing
D_a	max.24.5 mm	Largest permissible abutment diameter housing
r_a	max.0.8 mm	Fillet radius
r_b	max.0.3 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	7.37 kN
Basic static load rating	C₀	9.15 kN
Fatigue load limit	P_u	1.08 kN
Reference speed		24 000 r/min
Limiting speed		28 000 r/min

Description

Properties

Bearing part	Complete bearing
Number of rows	1
Outer ring type	Drawn cup with open ends
Aligning feature	With
Cage	Sheet metal
Number of flanges, outer ring	2
Radial internal clearance	CN
Tolerance class	Normal
Material, bearing	Bearing steel
Coating	Without
Sealing	Without
Lubricant	None
Relubrication feature	Without

Logistics

Product net weight	0.037 kg
eClass code	23-05-09-03
UNSPSC code	31171512

(12X28X12) (PNA12/28)

Additional information

Weight	0.037 kg
Size (mm)	12.000×28.000×12.000
Colour	BLUE