SKF 7305 1

[SaadMahmood]

I bought SKF 7305 bearing and I want to know if it is designed for Axial thurst? it is a single layer unsealed sphere ball bearin or the supplier gave me a defective one because the collar(inner ring) has some wobbling motion.
The supplier told me that SKF 7300 and 7200 series are designed for axial thurst impact too, is it really?

Saad

 

[electricpete]

7305 is an angle-contact ball bearing. (I wouldn't use the word sphere... sounds too much like spherical roller which is a different animal).

It is designed primarily for thrust loads. It requires a minimum thrust preload as well.

You can find the ratings on the SKF website.

I'm not sure about impacting.

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[Tmoose]

"or the supplier gave me a defective one because the collar(inner ring) has some wobbling motion".

Until assembled as an opposing pair or preloaded in some way there will be quite a bit of clearance in a single bearing. They are not meant to run as single bearings in most cases. I'd ask SKF to review your bearing arrangement.

 

[angiemae1]

Go to this info on skf.com or skfusa.com
Product Table - search 7305 under section
Angular contact ball bearings, single row

Preloads are based on diameter


Table 3: Preload of universally matchable single row angular contact ball bearings
arranged back-to-back or face-to-face



Bore Preload
diameter Class
d GA GB GC
over incl. min max max min max min max min max min max

mm ?m N ?m N ?m N

10 18 +4 -4 80 -2 -10 30 330 -8 -16 230 660
18 30 +4 -4 120 -2 -10 40 480 -8 -16 340 970
30 50 +4 -4 160 -2 -10 60 630 -8 -16 450 1 280

50 80 +6 -6 380 -3 -15 140 1 500 -12 -24 1 080 3 050
80 110 +6 -6 410 -3 -15 150 1 600 -12 -24 1 150 3 250
110 180 +6 -6 540 -3 -15 200 2 150 -12 -24 1 500 4 300

180 250 +8 -8 940 -4 -20 330 3 700 -16 -32 2 650 7 500
250 315 +8 -8 1 080 -4 -20 380 4 250 -16 -32 3 000 8 600

This info looks better on the web site.

 

[carburized]

7305 is a angular contact bearing. The more the angle is, more thrust they can take. But to answer your question, it will take thrust. Wobble which you are talking about, may be it is a clearance issue. Each bearing has a clearance depending on class.

http://www.bearingsandgears.com

 

[dimjim]

I think Tmoose and Carburize are on the money.
Why are you asking the question? Are you seeing
some type of premature failure? As Tmoose suggests
are you mounting it correctly? Wobble is simply
bearing clearance phenomenom. Clearance is generally
provided in the bearing to reduce the bearing
from binding or to reduce the turning torque.
Normally the less clearance in an angular type
bearing the more thrust it can handle in a combined
loading application. It is also true that the higher
the contact angle, the more thrust it can handle
as well.