 STANDARD BALL BEARINGS |
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| AISI 630 STAINLESS STEEL BALL BEARINGS |
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| AISI 630 stainless is excellent in corrosion resistance and can be hardened by heat treatment. AISI 630 stainless steel ball bearings can offer longer operation life under various corrosive environments with the excellent corrosion resistance and hardness. |
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| PD |
Corrosion resistance superior to AISI 440C stainless steel ball bearings.
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| QD |
Can be used for heavy-load and high-rotation applications for which AISI 304 stainless steel ball bearings would be unsuitable.
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| RD |
Available for various types of applications with its heat- and chemical-resistant fluorine grease pre-packed as standard lubricant.
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| SD |
Hybrid type with silicon nitride ceramic balls.
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| TD |
Different properties due to the material used.
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@
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AISI 630
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AISI 304
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AISI 440C
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Specific Gravity
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7.8
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7.93
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7.8
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Tensile Strength
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N/mm2
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1379
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520`600
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1900`2000
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Elongation
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14
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45`60
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Elastic Modulus
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N/mm2
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196000
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193000
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203000
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Hardness
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HV
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434
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170
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700
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HRC
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44.0
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3.0
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60.1
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Magnetism
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Magnetic
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Non magnetic
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Magnetic
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| Note: |
The properties listed in the table are typical values.
These values are not always guaranteed.
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Standard Specifications
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| Inner and Outer Rings |
AISI 630 |
| Ball |
Ceramic Balls(Silicon nitride Si3N4j
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| Retainer |
AISI 304 |
| Shield |
AISI 304 |
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Nitrile rubber(NBRj |
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Fluorinated Grease |
| Precision Grade |
JIS0 |
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Products with specifications differing from the above are also available:
*1@Also available with fluorine rubber seals.
*2@Other special grease also available.
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| Corrosion Resistancea |
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Material
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Condition
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Corrosion Weight Lossimm^Yearj
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Sulfuric Acid
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Hydrochloric Acid
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Nitric Acid
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Acetic Acid
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Phosphoric Acid
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5
35
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1
80
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2
80
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0.5
35
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1
Boiling
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66
Boiling
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33
Boiling
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20
Boiling
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70
Boiling
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AISI 630
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Aging Heat Treatment
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0.2
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0.9
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0.7
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0.1
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3.0
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AISI 304
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Solution Heat Treatment
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2.0
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0.4
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0.2
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0.1
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1.0
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The above table compares the corrosion characteristics of AISI 630 and AISI 304 stainless steel. |
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Note that results may differ from the data listed, depending on the environment and conditions under which the bearings are used. |
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| LCD and semiconductor manufacturing equipment, film manufacturing equipment, metal plating equipment, other equipment used in acid or alkaline environment. |
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| Due to the properties of AISI 630 stainless steel, bearings made of this material are not suitable for applications used under heavy loads or at high rotation that AISI 440C stainless steel ball bearings can carry. |
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