6213 and 6313 Bearings: Sizes, ZZ and 2RS E Variants
Both 6213 and 6313 bearings fit a 65 mm shaft: 6213 measures 65x120x23 mm (light series), while 6313 measures 65x140x33 mm (medium series). Choosing the correct part number depends on matching your machine's exact housing dimensions, load profile, and enclosure requirements. Ordering based on shaft size alone will lead to mismatched housing fits or premature mechanical failure.
Selecting between 6213 and 6313 bearings also requires choosing the proper enclosure variant. Rubber contact seals (2RS E) provide superior dust and moisture protection in dirty operating environments, whereas non-contact steel shields (ZZ) reduce friction for higher-speed machinery. Machined brass cage options (M) further extend performance in severe heavy-duty setups.
At HI-TEC BEARINGS, we supply 6213 in our premium HI-TEC SILVER tier and 6313 in both HI-TEC and HI-TEC SILVER product lines across 2RS E, ZZ, and M variants. Pricing and availability are verified directly with our engineering team on WhatsApp at +92-348-5563390.
What are the dimensions of 6213 and 6313 bearings?
Both 6213 and 6313 bearings fit a 65 mm shaft: 6213 measures 65x120x23 mm (light series), while 6313 measures 65x140x33 mm (medium series). 6213 and 6313 bearings are not interchangeable despite sharing a 65 mm bore, as their distinct outer diameters and widths require specific housing dimensions. Fitting a 6313 bearing into a bore designed for a 6213 bearing is physically impossible due to the 20 mm difference in outer diameter and 10 mm difference in width.
The dimensional divergence stems from ISO standardized bearing series definitions. The 6200 series represents a light-duty cross-section, ideal for electric motors, gearboxes, and pumps where space and weight are tightly controlled. The 6300 series represents a medium-duty cross-section, utilizing larger rolling elements and thicker rings to support significantly higher radial and dynamic loads[1][2].
| Specification | 6213 Bearing | 6313 Bearing |
|---|---|---|
| Bore Diameter (Shaft Size) | 65 mm | 65 mm |
| Outside Diameter (OD) | 120 mm | 140 mm |
| Width / Thickness | 23 mm | 33 mm |
| ISO Series | 6200 Series (Light) | 6300 Series (Medium) |
| Primary Application | Motors, standard gearboxes, pumps | Heavy-duty machinery, severe impact loads |
Because of the larger outer envelope, the 6313 bearing provides higher radial load carrying capability than the 6213 bearing[1][2]. However, if your motor or machinery casing was manufactured for a 120 mm outer diameter housing bore, only the 6213 model will seat correctly.
Parts in this article
| Part (bore x OD x width) | Variants | Price |
|---|---|---|
| 6213 65 x 120 x 23 mm 6200 Series | 6213 2RS E (2x Rubber Seal) · In stock 6213 ZZ (2x Shield) · In stock | Ask today's price on WhatsApp |
| 6313 65 x 140 x 33 mm 6300 Series | 6313 2RS E (2x Rubber Seal) · In stock 6313 M 6313 ZZ (2x Shield) · In stock | Ask today's price on WhatsApp |
What is the difference between 2RS E and ZZ bearing variants?
For 65 mm shaft bearings, 2RS E variants feature double rubber seals for dust and moisture protection, whereas ZZ variants use double steel shields for higher-speed operation. HI-TEC offers 6213 in HI-TEC SILVER and 6313 in both HI-TEC and HI-TEC SILVER tiers across 2RS E, ZZ, and M configurations. Selecting the right variant ensures optimum protection without generating excess frictional heat.
Rubber contact seals (2RS E) physically press against the inner ring. This design forms a barrier against grit, airborne particles, and liquid ingress, retaining grease in harsh environments. Non-contact steel shields (ZZ) maintain a minute clearance gap, eliminating contact friction and enabling higher limiting speeds[1]. The M designation indicates a solid machined brass cage[3][1], which offers robust structural integrity under heavy impact or vibration.
| Variant / Feature | 2RS E (2x Rubber Seal) | ZZ (2x Shield) | M (Machined Brass Cage) |
|---|---|---|---|
| Enclosure Design | Contact synthetic rubber | Non-contact steel shield | Open bearing with brass cage |
| Ingress Protection | Superior (dust & moisture) | Moderate (dry contaminants) | Open (requires external lubrication) |
| Frictional Resistance | Higher friction | Very low friction | Low friction |
| Operating Focus | Contaminated environments | Clean, high-speed machinery | High load / severe vibration |
| Brand Tier Availability | HI-TEC SILVER (6213/6313), HI-TEC (6313) | HI-TEC SILVER (6213/6313), HI-TEC (6313) | HI-TEC, HI-TEC SILVER (6313) |
Matching the variant to operational conditions prevents premature failure. Installing a ZZ shield in a wet environment causes grease contamination, while installing a 2RS E seal in ultra-high-speed equipment generates unnecessary friction and heat build-up[1].
Need a price? Ask HI-TEC BEARINGS on WhatsApp Send the part number (6213, 6313, or any other) to ask for today's price and availability. Open WhatsApp |
Frequently Asked Questions
What are the dimensions of 6213 and 6313 bearings?
Both bearings feature a 65 mm bore diameter to fit a 65 mm shaft. The 6213 light-series bearing measures 65x120x23 mm, whereas the 6313 medium-series bearing measures 65x140x33 mm.
What is the difference between 6213 and 6313 bearings for a 65 mm shaft?
The difference lies in outer diameter, width, and load rating. The 6213 model (120 mm OD, 23 mm width) is designed for light-to-medium industrial duty, while the 6313 model (140 mm OD, 33 mm width) features heavier cross-sections for greater load capacity.
What is the difference between 2RS E and ZZ bearing variants?
2RS E variants feature double rubber contact seals that block fine dust and moisture, making them ideal for dirty environments. ZZ variants use double non-contact metal shields, which create less friction and support higher operating speeds.
Can I replace a 6213 bearing with a 6313 bearing?
No, you cannot replace a 6213 bearing with a 6313 bearing. Although both fit a 65 mm shaft, the 6313 bearing has a 20 mm larger outer diameter and is 10 mm wider, so it will not fit into a housing machined for a 6213 bearing.
References
- SKF bearings and mounted products. https://cdn.skfmediahub.skf.com/api/public/0901d196807026e8/pdf_preview_medium/0901d196807026e8_pdf_preview_medium.pdf (2026-11-05)
- 6213 M - Deep groove ball bearings - SKF. https://www.skf.com/products/rolling-bearings/ball-bearings/deep-groove-ball-bearings/productid-6213%20M?failover=true (2026-10-01)
- Self-aligning ball bearings | Schaeffler medias. https://medias.schaeffler.us/en/knowledge-center/rolling-bearings/self-aligning-ball-bearings (2026-09-28)