6204 Bearing Size & Variants: 6204 ZZ vs 6204 2RS E
The standard 6204 bearing size is a 20 mm bore, 47 mm outside diameter, and 14 mm width. It belongs to the 6200 light metric series, making it one of the most widely specified deep groove ball bearings in industrial machinery, electric motors, and automotive assemblies across Pakistan.
Selecting the correct 6204 bearing requires looking beyond the basic dimensions. The suffix - such as 6204 ZZ or 6204 2RS E - dictates the enclosure type, friction characteristics, and environmental protection. Matching both the exact envelope dimensions and the sealing specification is critical to prevent premature equipment failure and costly maintenance downtime.
What are the dimensions of 6204, 6205, and 6304 bearings?
The HI-TEC SILVER 6204 bearing features a 20 mm bore, 47 mm outside diameter, and 14 mm width. Dimensions define physical mounting fit, but bearings sharing a bore size are not interchangeable if their outside diameter or width differ.
For example, the HI-TEC SILVER 6205 has a 25 mm bore, 52 mm OD, and 15 mm width. In contrast, the HI-TEC SILVER 6304 features a 20 mm bore, 52 mm OD, and 15 mm width. A 6304 bearing has a 52 mm outside diameter and 15 mm width, meaning it cannot interchange with a 6204 despite sharing a 20 mm bore[1][2]. The 6300 series uses larger internal rolling elements to handle heavier radial loads, requiring a larger housing bore than the 6200 series[1][3].
| Part Number | Series | Bore (mm) | Outside Diameter (mm) | Width (mm) | Standard Variants Listed |
|---|---|---|---|---|---|
| 6204 | 6200 Series | 20 | 47 | 14 | 6204 2RS E, 6204 ZZ |
| 6205 | 6200 Series | 25 | 52 | 15 | 6205 2RS E, 6205 ZZ |
| 6304 | 6300 Series | 20 | 52 | 15 | 6304 (Open), 6304 2RS E, 6304 ZZ |
Checking dimensions before replacing a unit prevents housing misalignment and fit failures. You can verify specifications directly on our 6204 bearing product page.
Parts in this article
| Part (bore x OD x width) | Variants | Price |
|---|---|---|
| 6204 20 x 47 x 14 mm 6200 Series | 6204 2RS E (2x Rubber Seal) 6204 ZZ (2x Shield) · In stock | Ask today's price on WhatsApp |
| 6205 25 x 52 x 15 mm 6200 Series | 6205 2RS E (2x Rubber Seal) · Low stock 6205 ZZ (2x Shield) · In stock | Ask today's price on WhatsApp |
| 6304 20 x 52 x 15 mm 6300 Series | 6304 (Open) · In stock 6304 2RS E (2x Rubber Seal) · In stock 6304 ZZ (2x Shield) · In stock | Ask today's price on WhatsApp |
What is the difference between 6204 ZZ and 6204 2RS E bearings?
The HI-TEC SILVER 6204 ZZ variant uses two metal shields, whereas the 6204 2RS E features two contact rubber seals for enhanced protection. Bearing series numbers indicate size, but the suffix (ZZ vs 2RS E) determines environmental sealing and cannot be swapped arbitrarily.
Metal-shielded variants (ZZ) rely on non-contact steel plates that keep grease inside while allowing low rotational friction and higher speed capability[2]. They work best in clean, indoor environments like electric fans or sealed gearboxes[3]. Rubber-sealed variants (2RS E) use contacting synthetic rubber lips that press against the inner ring to block fine dust, slurry, and moisture[4]. The trade-off for higher protection is slightly increased friction torque[4].
| Operating Environment | Recommended Suffix | Sealing Mechanism | Key Advantage |
|---|---|---|---|
| Clean, low-friction indoor units | ZZ | Two non-contact metal shields | Low drag & higher speed |
| Dusty, moist, or outdoor machinery | 2RS E | Two contact rubber seals | High contaminant exclusion |
| Internal oil-bath systems | Open (e.g., 6304) | None (unshielded) | Unrestricted oil flow |
Selecting the wrong enclosure leads to grease leakage or dirt ingress. HI-TEC confirms exact part availability and current pricing for 6200 and 6300 series bearings via WhatsApp at +92-348-5563390 in Pakistan. You can also explore our complete 6304 bearing product page for medium-series requirements.
Need a price? Ask HI-TEC BEARINGS on WhatsApp Send the part number (6204, 6205, 6304, or any other) to ask for today's price and availability. Open WhatsApp |
Frequently Asked Questions
What are the dimensions of a 6204 bearing?
A standard 6204 bearing has a 20 mm bore diameter, a 47 mm outside diameter, and a width of 14 mm. These specifications apply across all standardized 6204 series deep groove ball bearings.
What is the difference between 6204 ZZ and 6204 2RS E bearings?
The 6204 ZZ uses two non-contact metal shields designed for low drag and clean operating environments. The 6204 2RS E uses two contact rubber seals that provide superior protection against moisture and fine dirt.
Are 6204 and 6304 bearings interchangeable?
No, 6204 and 6304 bearings are not interchangeable. While both share a 20 mm bore size, the 6304 has a larger 52 mm outside diameter and 15 mm width compared to the 6204 bearing's 47 mm outside diameter and 14 mm width.
What is the bore size and outside diameter of a 6205 bearing?
The 6205 bearing features a 25 mm bore diameter, a 52 mm outside diameter, and a width of 15 mm.
References
- 6204 - Deep groove ball bearings. https://www.skf.com/us/products/rolling-bearings/ball-bearings/deep-groove-ball-bearings/productid-6204 (2026-10-19)
- 6204 - Deep groove ball bearings - SKF. https://www.skf.com/products/rolling-bearings/ball-bearings/deep-groove-ball-bearings/productid-6204?failover=true (2026-09-22)
- 6204 Series | NSK. https://www.nsk.com/engineering/products/bearings/ball-bearings/deep-groove-ball-bearings/single-row-deep-groove-ball-bearings/6204-dgbb-sr.html (2024-11-05)
- 6204-2RSH Deep groove ball bearing with seals. https://www.skf.com/us/products/rolling-bearings/ball-bearings/deep-groove-ball-bearings/productid-6204-2RSH (2026-10-17)