1/4 Inch 6.35mm Top Quality Steel 100 Grade Ball Bearings - Pack of 100

£13.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
Industry Standard Grade 100 316 Stainless Ball Bearings

Diameter Ø = 1/4 Inch / 0.25" / 6.35mm

High quality graded 316 stainless steel ball bearings made from AISI 316 Stainless Steel with a hardness of 25 - 39 Rockwell Scale equivalent to 140 - 160HB (Brinnel Scale) the hardness is all the way through the ball. These are the same stainless 316 steel balls used to manufacture bearing assemblies and have a high duty and life cycle.

Hardened austentic stainless steel with good corrosion resistance to sea water, dilute nitric, sulphuric and acetic acids, photo chemicals, inks, bleaches, dyes etc.

- Ball diameter: 6.35mm = 1/4 Inch
- Material: 316 Stainless Steel
- Min Crush Load: 2280kg
- Hardness: 25-39 HRC
- Hardness Depth: Through Hardened
- Corrosion Resistance: Excellent
- Note: Can be Drilled
- Weight Each: 1.05g
- Attracted to Magnets: No
Product Reviews (0)
Questions & Answers (3) Q & A
Download File  
Be the first to write a review
Feel free to leave a review of this product, good or bad it helps other customers with their buying decision.
Questions & Answers (3)
Would these be suitable for an Isla bike rear wheel hub
18 Jun 2019
These would be for the rear hub of an Isla Bike Beinn 26 and I've had them apart and they're definitely 1/4 inch in size however I'm a little confused about grade and type of steel that is best. The hubs seem to be non-branded.
Hi there,

As long as the size is all correct to what you need, it will work absolutely fine.

Are These Equivalent To Shimano Y00091310 Bearings Also In Quality
20 Jun 2017
Hi, these bearings are the same diameter as the Shimano bearing so can be used as replacements. They are stainless steel not steel so better corrosion resistance. They are 100 grade not 25 or 50 that Shimano use, but Shimano cups and cones aren't smooth enough to benefit from 25 or 50 grade. Thanks.
What Are Advantages Of The Different Bearing Materials?
22 Jan 2015
I see you have stainless, steel, and chrome steel bearings. What are the advantages of each (presumably corrosion, but what about hardness?) and which would you recommend for Shimano cup and cone bearings (e.g. my old XT hubs, or my new Ultegra hubs)?

The Chrome steel bearings are actually a harder grade than the stainless bearings. When it comes to bearings the best thing to do is look at the grade, the lower the number the more round the bearings are. Shimano normally use 25 grade bearings for the higher end hubs and 50 grade for the lower end ones. I would not recommend spending more on higher quality bearings though as the cones and cups on most Shimano hubs aren't smooth enough to make a full difference, they will make smooth bearings rough just as quick.