Product Description
The NTN BL311N is a single-row maximum capacity (filling slot) deep groove radial ball bearing from NTN's BL3 series, featuring a snap ring groove machined into the outer ring without a snap ring included. With a 55mm (2.1654 in) bore, 120mm (4.7244 in) outside diameter, and 29mm (1.1417 in) width, this open-type bearing is manufactured from 52100 high carbon chrome steel with a pressed steel cage and is suitable for a wide range of industrial radial load applications. The "N" suffix designates a precision-ground annular snap ring groove on the outer ring to facilitate axial positioning in through-bore housings, with the snap ring ordered separately.
Technical Specifications
| Specification | Value |
|---|---|
| Brand | NTN Bearings |
| Model / Part Number | BL311N |
| Bearing Type | Single Row Maximum Capacity Deep Groove Radial Ball Bearing |
| Bearing Series | BL3 (Maximum Capacity Series) |
| Also Known As | 311N |
| Bore Diameter (d) | 55 mm / 2.1654 in |
| Outside Diameter (D) | 120 mm / 4.7244 in |
| Width (B) | 29 mm / 1.1417 in |
| Fillet Radius (r) | 2.0 mm / 0.0787 in |
| Enclosure / Closure Type | Open |
| Seal Type | None (Open) |
| Ring Modification (Suffix N) | Snap Ring Groove on Outer Ring — Without Snap Ring |
| Filling Slot (Maximum Capacity) | Yes |
| Number of Rows | 1 (Single Row) |
| Bore Type | Round (Cylindrical) |
| Material | 52100 High Carbon Chrome Steel |
| Cage Type | Pressed Steel |
| Ball Material | Steel |
| Precision Rating | ABEC 1 / ISO Class P0 (Standard) |
| Radial Internal Clearance | CN (Normal / C0) |
| Dynamic Load Rating (Cr) | 21,100 lbf / 21.1 kN |
| Static Load Rating (C0r) | 15,200 lbf / 45 kN |
| Limiting Speed — Oil Lubrication | 6,100 RPM |
| Limiting Speed — Grease Lubrication | 5,200 RPM |
| Operating Temperature Range | -40°C to 120°C (-40°F to 250°F) |
| da min | 64 mm / 2.5197 in |
| da max | 74 mm / 2.9134 in |
| Da max | 111 mm / 4.3701 in |
| Weight | ~1.48 kg / 3.26 lbs |
We warranty all items for 30 days from date of purchase.
Other Details
We warranty all items for 30 days from date of purchase. If you experience any issues with your item within this period, please contact us and we will work with you to resolve the problem. This warranty covers defects in functionality but does not cover damage caused by misuse, improper installation, or normal wear and tear.Product Videos
Custom Field
GTIN 679523686161
Material 52100 Chrome Steel
Manufacturer NTN Bearings
Dynamic Load Rating 21,100 lbf / 21.1 kN
Empty Weight 1.48 kg / 3.26 lbs
Enclosure Type Open
Part Number BL311N
Series BL3 Maximum Capacity Series
Shelf A-2
Bore Diameter 55 mm
Model BL311N
MPN BL311N
Type Ball Bearing
