As a professional bearing supplier in China serving industrial machinery and power transmission systems, BMT Bearings has long specialized in the development and production of Inch Series Deep Groove Ball Bearings and various high-precision bearings.
Inch Series Deep Groove Ball Bearings are deep groove ball bearings whose main dimensions, including bore diameter, outside diameter and width, are designed based on inches (in) as the basic unit. Compared with metric bearings, which use millimeters (mm) as the dimensional unit, the two types share basically the same geometric principles for their internal raceways and balls. However, inch series bearings are mainly used in machinery with imperial dimensions, imported equipment and instruments, or specific industrial systems, and they cannot be directly interchanged with metric bearings.
| Comparison Dimension | Inch Series Deep Groove Ball Bearings | Metric Series Deep Groove Ball Bearings |
|---|---|---|
| Dimension Units | Bore, outside diameter and width are all in inches (in) as standard units. | Bore, outside diameter and width are all in millimeters (mm) as standard units. |
| Common Model Designations | Mainly R series (e.g., R2, R4, R6) or 1600 series (e.g., 1601, 1614). | Mainly 4-digit codes such as 6000, 6200, 6300, 6800 and 6900 series. |
| Design and Tolerance Standards | Follow imperial industrial dimension standards such as ANSI / ABMA. | Follow international and national metric standards such as ISO / DIN / GB. |
| Primary Application Markets | Widely used in original imported European / American equipment, American standard industrial machinery, specific instruments and power tools. | Extremely high global versatility; widely used in most modern machinery, automobiles, home appliances and general industrial equipment. |
| Interchangeability & Substitution | Cannot be physically interchanged with metric bearings (even if numerical conversions are close, tolerance zones differ). | Cannot be physically interchanged with inch series bearings. |
Working with metric dimensions instead? Browse our full Deep Groove Ball Bearings range, or compare the Single Row Deep Groove Ball Bearing series.
Inch Series Deep Groove Ball Bearings follow the standard raceway geometry of deep groove ball bearings, with the main difference being that the bore diameter, outside diameter and width are precisely measured and manufactured in imperial units (inches). These bearings can accommodate radial loads in both directions as well as certain axial loads, while maintaining low friction torque during high-speed operation.
To meet different sealing and lubrication requirements under various operating conditions, we provide multiple structural configurations:
Suitable for enclosed gearboxes and machinery where external oil or grease lubrication systems are used.
Equipped with steel shields on both sides to effectively prevent particle ingress while helping retain the internal grease.
Uses contact rubber seals on both sides to provide higher protection against dust, moisture and harsh environmental exposure.
The table below lists common standard models of BMT Bearings inch series deep groove ball bearings. All dimensions are given in both millimeters and inches for cross-reference during procurement and model selection.
| Inch Deep Groove Ball Bearing Specifications (Part Common Models) | ||||||
|---|---|---|---|---|---|---|
| Model | Seal Type |
Bore (d) mm / inch |
Outer (D) mm / inch |
Width (B) mm / inch |
Chamfer (r) mm |
Load Rating (N) Cr / Cor |
| 1601 2RS | 2RS | 4.762 / 3/16 | 17.462 / 11/16 | 7.938 / 5/16 | 0.3 | 1510 / 720 |
| 1601 2Z | 2Z | 4.762 / 3/16 | 17.462 / 11/16 | 6.35 / 1/4 | 0.3 | 1510 / 720 |
| 1602 2RS | 2RS | 6.35 / 1/4 | 17.462 / 11/16 | 7.938 / 5/16 | 0.3 | 1510 / 720 |
| 1602 2Z | 2Z | 6.35 / 1/4 | 17.462 / 11/16 | 6.35 / 1/4 | 0.3 | 1510 / 720 |
| 1603 2RS | 2RS | 7.938 / 5/16 | 22.225 / 7/8 | 8.737 / 11/32 | 0.3 | 2540 / 1340 |
| 1603 2Z | 2Z | 7.938 / 5/16 | 22.225 / 7/8 | 7.144 / 9/32 | 0.3 | 2540 / 1340 |
| 1604 2RS | 2RS | 9.525 / 3/8 | 22.225 / 7/8 | 8.737 / 11/32 | 0.4 | 2540 / 1340 |
| 1604 2Z | 2Z | 9.525 / 3/8 | 22.225 / 7/8 | 7.144 / 9/32 | 0.4 | 2540 / 1340 |
| 1605 2RS/2Z | 2RS / 2Z | 7.938 / 5/16 | 23.019 / 29/32 | 7.938 / 5/16 | 0.3 | 2540 / 1340 |
| 1606 2RS/2Z | 2RS / 2Z | 9.525 / 3/8 | 23.019 / 29/32 | 7.938 / 5/16 | 0.4 | 2540 / 1340 |
| 1607 2RS/2Z | 2RS / 2Z | 11.112 / 7/16 | 23.019 / 29/32 | 7.938 / 5/16 | 0.4 | 3550 / 1930 |
| 1614 2RS/2Z | 2RS / 2Z | 9.525 / 3/8 | 28.575 / 1-1/8 | 9.525 / 3/8 | 0.6 | 3920 / 2240 |
| 1615 2RS/2Z | 2RS / 2Z | 11.112 / 7/16 | 28.575 / 1-1/8 | 9.525 / 3/8 | 0.6 | 3920 / 2240 |
| 1616 2RS/2Z | 2RS / 2Z | 12.7 / 1/2 | 28.575 / 1-1/8 | 9.525 / 3/8 | 0.6 | 3920 / 2240 |
| 1620 2RS/2Z | 2RS / 2Z | 11.112 / 7/16 | 34.925 / 1-3/8 | 11.112 / 7/16 | 0.6 | 5880 / 3470 |
| 1621 2RS/2Z | 2RS / 2Z | 12.7 / 1/2 | 34.925 / 1-3/8 | 11.112 / 7/16 | 0.6 | 5880 / 3470 |
| 1622 2RS/2Z | 2RS / 2Z | 14.288 / 9/16 | 34.925 / 1-3/8 | 11.112 / 7/16 | 0.6 | 5880 / 3470 |
| 1623 2RS/2Z | 2RS / 2Z | 15.875 / 5/8 | 34.925 / 1-3/8 | 11.112 / 7/16 | 0.6 | 5880 / 3470 |
| 1628 2RS/2Z | 2RS / 2Z | 15.875 / 5/8 | 41.275 / 1-5/8 | 12.7 / 1/2 | 0.6 | 7320 / 4440 |
| 1630 2RS/2Z | 2RS / 2Z | 19.05 / 3/4 | 41.275 / 1-5/8 | 12.7 / 1/2 | 0.6 | 7320 / 4440 |
| 1633 2RS/2Z | 2RS / 2Z | 15.875 / 5/8 | 44.45 / 1-3/4 | 12.7 / 1/2 | 0.6 | 7320 / 4440 |
| 1635 2RS/2Z | 2RS / 2Z | 19.05 / 3/4 | 44.45 / 1-3/4 | 12.7 / 1/2 | 0.6 | 7320 / 4440 |
Used in small motors, vacuum cleaners and garden tools to provide smooth operation and low-noise performance.
Used in auxiliary motors, pumps and drivetrain support components, meeting the requirements of the IATF 16949 automotive quality management system.
Maintain low temperature rise and stable lubrication under continuous high-load operating conditions.
Resist vibration and external impact, helping reduce equipment downtime and maintenance frequency.
BMT Bearings strictly implements high-standard manufacturing processes throughout production. From raw material procurement to finished product shipment, each stage undergoes multiple standardized inspections. The factory is equipped with 100 automated grinding production lines and automated assembly lines to ensure high consistency in geometric tolerances and surface roughness for every bearing.
For quality inspection, the company is equipped with comprehensive measuring and testing instruments and conducts complete batch-by-batch inspections of finished products:
High-precision pneumatic gauges and electronic comparators are used to strictly control bore diameter, outside diameter, internal clearance and rotational accuracy.
Dedicated vibration testers (V1, V2 and V3 grades) and noise testing equipment (dBA) are used for screening to ensure that motor-grade (EMQ) bearings meet requirements for smooth operation and low noise.
High-carbon chromium bearing steel undergoes precision heat treatment to provide excellent wear resistance and fatigue strength.
The service life of inch series deep groove ball bearings in actual applications often depends on proper selection and installation. Understanding common failure causes can help extend machinery maintenance intervals.
If the shaft tolerance is excessive during installation, excessive expansion of the inner ring may reduce the original internal clearance (C0). For high-temperature operating conditions, a C3 clearance specification should be considered.
Never strike the bearing rings directly or transfer installation force through the rolling elements. A shrink-fit method or a suitable sleeve installation tool is recommended.
At excessively high speeds, improperly selected grease may separate or deteriorate due to centrifugal effects. For high-temperature or high-speed applications, industrial grease with an appropriate viscosity should be selected according to the actual speed factor.
Need inch-dimension bearings for your line?
Send your model list, drawing or sample. BMT Bearings replies within 24 working hours with pricing, seal options and lead time.
A1: First confirm the bore diameter, outside diameter and width, then check the seal type, load requirements and operating environment. If you only have an original part number or a sample, send it to us and we will cross-reference the exact inch-dimension model.
A2: The choice should be based on dust, moisture, lubrication and maintenance conditions, while also referring to the configuration of the original bearing. As a rule of thumb, 2Z steel shields suit dry, dusty environments with moderate speeds, while 2RS rubber seals suit humid, contaminated or wash-down applications.
A3: Direct replacement is not recommended. The complete dimensions, seal type, fit requirements and load requirements should be checked before selecting a replacement. Even when inch-to-millimeter conversions appear close, tolerance zones usually differ. Compare our deep groove ball bearings only after a full dimensional check.
A4: Check the model, dimensions, seal type and appearance, and make sure the shaft, bearing housing and installation position are clean and free from damage. Confirm that the internal clearance matches the interference fit and the operating temperature.
A5: Check the installation condition, lubrication, contamination, load and seal configuration, and confirm that the bearing model and dimensions are properly matched. If the issue persists, our technical team can review your application data and recommend a corrected specification.
A6: Yes. We support sample and small-batch trial orders alongside bulk wholesale supply, so buyers can verify precision, noise level and fit before committing to volume production. Full OEM customization of clearance, grease, seal type and packaging is available — see our product range for reference.
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No.183,Longfeng,West of Zhangting industrial Zone,Yuyao,Ningbo,China
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