# NTN 7311BL1 Angular Contact Ball Bearing - 55 mm Bore, Single Row, Open, Standard Precision - MROSupply.com ***NTN 7311BL1 73 series single-row angular contact ball bearing with 55 mm straight bore. Open design, standard precision. Suitable for combined radial and axial loads in pumps, compressors, and machine tool spindles.*** ## Product details: - Catalog number: 7311BL1 - SKU: 277596 - Price: ***$220.37*** Each - Shipping: ***FREE SHIPPING*** ON ORDERS OVER $100 - Typically Ships in: 1 day - Brand: [NTN Bearing](https://www.mrosupply.com/brands/ntn-bearing/) - Category: - [Single Row Angular Contact Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/single-row-angular-contact-bearings/) - [Angular Contact Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/) - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/) - [Bearings](htts://www.mrosupply.com/bearings/) - Unit of measure: each - Weight: 3.488 lb - UPC: 4547359451030 ## Product images: - https://static.mrosupply.com/images/noimage.webp ## Product attributes; - Enclosure: Open - Height: 4.724 - I.D.: 55 mm - Length: 4.724 - O.D.: 120 mm - Width: 1.1417 ## Product documents / software: - [Drawing](https://documents.mrosupply.com/product_documents/59/73/5973972/1162_S_9Tu0vwD.png) - [Drawing 1162_S](https://documents.mrosupply.com/product_documents/28/38/283866/1162_S_U4NXYaQ.png) ## Alternate products to `NTN 7311BL1 Angular Contact Ball Bearing - 55 mm Bore, Single Row, Open, Standard Precision - MROSupply.com`: - [SKF 7311 BECBM angular contact ball bearing, 55mm bore, 40° contact angle, machined brass cage. Designed for combined radial and axial loads in pumps, gearboxes, and machine-tool spindles.](https://www.mrosupply.com/products/313717/as-markdown/) - [Nachi Bearing 7311BMUC3 Angular Contact Ball Bearing Single Flush Ground 40](https://www.mrosupply.com/products/5900190/as-markdown/) - [Rollway 7311 BM 55 mm Bore Size, 120 mm Outside Diameter, Angular Contact Ball Bearing, Straight Bore, 52100 Bearing Steel, Normal Radial Clearance](https://www.mrosupply.com/products/2889890/as-markdown/) - [NSK 7311BYG single-row angular contact ball bearing with 55 mm bore and 100 mm OD. Features a 40° contact angle and a machined brass cage for high-speed operation. Designed for combined radial and axial loads in pumps, gearboxes, and machine-tool spindles.](https://www.mrosupply.com/products/5035309/as-markdown/) - [NSK 7311BMPC single-row angular contact ball bearing with 55 mm bore and 40° contact angle. Features a machined brass cage for high-speed and heavy-load applications. Designed for combined radial and axial loads in pumps, gearboxes, and machine-tool spindles.](https://www.mrosupply.com/products/5035307/as-markdown/) - [Koyo 7311B-5G C3FY is a single-row angular contact ball bearing with a 55 mm straight bore, 40° contact angle, and C3 clearance. The 5G suffix indicates improved internal geometry, and C3FY denotes factory pre-greasing with C3 clearance. Designed for combined radial and axial loads in machine tool spindles, pumps, and compressors.](https://www.mrosupply.com/products/1495337/as-markdown/) - [FAG 7311B.MP.UA single row angular contact ball bearing with 55mm bore. Universal face-to-face arrangement for duplex mounting. Ball guided cage. Multi-purpose design suitable for high-speed applications requiring axial load capacity in both directions.](https://www.mrosupply.com/products/2176769/as-markdown/) - [FAG 7311B.MP.UO single row angular contact ball bearing with 55mm bore. Features universal back-to-back arrangement and ball guided cage. Suitable for multi-purpose applications requiring high axial and radial load capacity. Precision German engineering from Schaeffler.](https://www.mrosupply.com/products/2176770/as-markdown/) ## 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.