# MRC (SKF) 309SFF Single Row Ball Bearing - 45mm Bore, Double Shielded - MROSupply.com ***MRC (SKF) 309SFF single row ball bearing with 45mm bore, 3.937" OD, double shielded, metal cage. Radial bearing for industrial applications.*** ## Product details: - Catalog number: 309SFF - SKU: 1132560 - Price: ***$102.72*** Each - Shipping: ***FREE SHIPPING*** ON ORDERS OVER $100 - Typically Ships in: 1 day - Brand: [MRC Bearing](https://www.mrosupply.com/brands/mrc-bearing/) - Category: - [Felt Seal Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/felt-seal-ball-bearings/) - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/) - [Bearings](htts://www.mrosupply.com/bearings/) - Unit of measure: each - Weight: 1.938 lb - Technicall support: contact supplier for technical support on 888 753 3477 ## Product images: - https://static.mrosupply.com/images/noimage.webp ## Product attributes; - Bearing Type: Radial - Cage: Metal - Enclosure: Double Shielded - I.D.: 1.772 - Locking: None - O.D.: 3.937 ## Product documents / software: - [Drawing](https://documents.mrosupply.com/product_documents/34/34FF/d_skf_6200_2z_R15738.jpg) - [Engineering Handbook](https://documents.mrosupply.com/product_documents/10/100KSF/engineering_handbook.pdf) - [Installation](https://documents.mrosupply.com/product_documents/10/100KSF/installation.pdf) - [Interchange](https://documents.mrosupply.com/product_documents/10/100KSF/INTERCHANGE.pdf) - [Lubrication](https://documents.mrosupply.com/product_documents/10/100KSF/lubrication.pdf) ## Alternate products to `MRC (SKF) 309SFF Single Row Ball Bearing - 45mm Bore, Double Shielded - MROSupply.com`: - [SKF 6309-2Z/C3 deep groove ball bearing, 45mm bore, double shielded with metal shields on both sides, C3 clearance. Sheet metal cage, bearing steel construction. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/319936/as-markdown/) - [SKF 6309-2Z deep groove ball bearing, 45mm bore, 3.937 in OD, double shielded with steel shields both sides. Normal internal clearance, sheet metal cage. Bearing steel construction. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/320958/as-markdown/) - [SKF 6309 2ZJEM deep groove ball bearing, 45mm bore, double shielded with metal shields, C3 clearance, sheet metal cage. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/320597/as-markdown/) - [NACHI 6309ZZEC3 Deep Groove Ball Bearing Single Row 45X100X25MM Two Shields Steel Cage C3 Clearance](https://www.mrosupply.com/products/696383/as-markdown/) - [NSK 6309ZZC3 Deep groove ball bearing with 45 mm bore, 100 mm OD, and 25 mm width. It features double metal shields (ZZ) and C3 internal clearance for applications requiring thermal expansion accommodation. The pressed steel cage provides reliable roller guidance. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034252/as-markdown/) - [Koyo 6309 ZZ is a single-row deep groove ball bearing with a 45 mm bore, 100 mm outside diameter, and 25 mm width. It features double steel shields (ZZ) and a pressed steel cage. This bearing is designed for radial and moderate axial loads in electric motors, pumps, fans, and general industrial rotating equipment.](https://www.mrosupply.com/products/1494959/as-markdown/) - [NSK 6309ZZ shielded deep groove ball bearing with 45 mm bore. Double metal shields (ZZ) protect against contaminants. Pressed steel cage and normal clearance. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034251/as-markdown/) - [Rollway 6309 ZZ EMQ BALL 16000-61800-62200-62300](https://www.mrosupply.com/products/2890165/as-markdown/) ## Product's reviews: - Motor bearings - Of all the bearings I have purchased in the last 45 years, these look to be top quality. - Great bearings, great price! - I am rebuilding an old Delta/Rockwell drill press and was having trouble finding the correct replacement bearings at a reasonable price from my usual go-to online dealers; from those that even had them available. Shipping times where reasonable. Competitively priced at time of purchase. Stock status was available, had to use contact link to make sure they were available to ship. Would be very nice if real-time in-stock status could be available while hunting down need parts, but in the long run it's not that big of deal. The stock status email back following the inquire was quick with a quoted price and purchase link. ## FAQ: - How do I choose the right type of bearing for my application?: Start with the load and how it’s applied. You need to know if you’re dealing with radial loads, axial loads, or a mix of both. Then look at speed, operating environment, and space constraints. For example, ball bearings are great for high speed and lighter loads, while roller bearings handle heavier loads but usually at lower speeds. If there’s contamination, moisture, or heat involved, you may need sealed bearings or specific materials. In most cases, the right choice comes down to matching load type, speed, and environment to the bearing design. - What is the difference between deep groove and angular contact ball bearings?: Deep groove ball bearings are the most common type. They’re designed to handle mainly radial loads, but they can also take some axial load in both directions. They’re simple, versatile, and used in everything from motors to conveyors. Angular contact ball bearings are built for combined loads, especially where there’s significant axial force in one direction. They’re often used in pairs and are common in higher precision or higher load applications like pumps and gearboxes. If your load is mostly radial, go deep groove. If axial load matters more, angular contact is usually the better choice.