SR inch series stainless steel bearings are deep groove ball bearings made for inch-dimension assemblies where corrosion resistance, compact size, and simple replacement matching are important. The S prefix identifies stainless material, while the SR/R inch series format helps buyers compare bore, outside diameter, and width in both millimeters and inches.
In this series, open and ZZ shielded bearings can have the same bore and outside diameter but different widths. That detail matters during replacement: a bearing that fits the shaft may still be too narrow or too wide for the wheel, guide, pulley, or housing. For small-size matching, use this chart together with CXE Bearing collections for stainless miniature ball bearings, metric ball bearings, and stainless steel bearings; those pages provide a cleaner path from dimensions to related products.
All ZZ shielded bearings can also be made with 2RS rubber seals.
How to Read SR Inch Series Bearing Sizes
d represents the inner diameter, D represents the outer diameter, and B represents the width or height of the bearing. ZZ indicates metal shields, while 2RS indicates rubber seals. When an older bearing has no clear marking, measure the bore, OD, and width with care, then compare both the inch and metric values in the table.
When Buyers Use SR Stainless Inch Bearings
SR inch series bearings are commonly reviewed for small wheels, rollers, light-duty guides, instruments, inch-size equipment rebuilds, compact mechanisms, and older assemblies that were designed around inch dimensions. Stainless material is useful where the bearing may see humidity, light water exposure, cleaning, or mild corrosion risk.
Open, ZZ, and 2RS Selection Notes
Open bearings can be suitable when the surrounding system provides lubrication and contamination protection. ZZ shielded bearings add compact metal shields with lower drag than many contact seals. 2RS rubber-sealed options can improve protection against dust and moisture, but the available width, seal drag, and speed expectation should be reviewed before changing from an open or ZZ bearing.
Size Chart
Type d(mm) d(inch) D(mm) D(inch) B(mm) B(inch)
SR6 OPEN 9.525 0.3750 22.225 0.8750 5.558 0.2188
SR6 ZZ 9.525 0.3750 22.225 0.8750 7.142 0.2812
SR8 OPEN 12.7 0.5000 28.575 1.1250 6.35 0.2500
SR8 ZZ 12.7 0.5000 28.575 1.1250 7.9375 0.3125
SR10 OPEN 15.875 0.6250 34.925 1.3750 7.142 0.2812
SR10 ZZ 15.875 0.6250 34.925 1.3750 8.731 0.3437
SR12 OPEN 19.05 0.7500 41.275 1.6250 7.9375 0.3125
SR12 ZZ 19.05 0.7500 41.275 1.6250 11.1125 0.4375
SR14 OPEN 22.225 0.8750 47.625 1.8750 9.525 0.3750
SR14 ZZ 22.225 0.8750 47.625 1.8750 12.7 0.5000
SR16 OPEN 25.4 1.0000 50.8 2.0000 9.525 0.3750
SR16 ZZ 25.4 1.0000 50.8 2.0000 12.7 0.5000
SR18 OPEN 28.575 1.1250 53.975 2.1250 9.525 0.3750
SR18 ZZ 28.575 1.1250 53.975 2.1250 12.7 0.5000
SR20 OPEN 31.75 1.2500 57.15 2.2500 9.525 0.3750
SR20 ZZ 31.75 1.2500 57.15 2.2500 12.7 0.5000
SR22 OPEN 34.925 1.3750 63.5 2.5000 11.1125 0.4375
SR22 ZZ 34.925 1.3750 63.5 2.5000 14.288 0.5625
SR24 OPEN 38.1 1.5000 66.675 2.6250 11.1125 0.4375
SR24 ZZ 38.1 1.5000 66.675 2.6250 14.288 0.5625
Replacement Checklist
Before requesting a replacement, confirm the marked bearing number, measured bore, outside diameter, width, closure type, and operating environment. If the bearing is used in a small roller or wheel, include photos of the mounted position and note whether there is any side contact, washing, dust, or lubricant contamination.
| Check | Why It Matters |
|---|---|
| Bore, OD, and width | SR open and ZZ versions may share bore and OD but differ in width |
| Inch and metric readings | Inch-size bearings can be misread if only rounded metric values are used |
| Closure type | Open, ZZ, and 2RS choices affect protection, drag, and available space |
| Material need | Stainless steel helps where moisture or mild corrosion is present |
| Existing assembly | Wheel, guide, pulley, and housing design affect whether substitution is safe |
Related Bearing Paths
For stainless inch-size bearings, start with stainless steel bearings and stainless miniature ball bearings. If the replacement is actually a metric part, compare the dimensions against metric ball bearings before placing the RFQ.
FAQ
Are SR inch series bearings the same as metric miniature bearings?
No. Some sizes may look close when rounded, but SR inch series bearings are built around inch dimensions. Always compare exact bore, outside diameter, and width before substitution.
Can a ZZ SR bearing be changed to 2RS?
It may be possible when moisture or dust protection is more important, but the seal style can affect drag and available width. Confirm the mounted space before changing the closure type.
What should be included in an SR bearing RFQ?
Send the bearing number, measured dimensions, closure type, material requirement, quantity, environment, and photos if the bearing is from an older or hard-to-identify assembly.