The SKF FSAF 520 is a split plummer block housing without bearing from the SAF series, featuring a two-piece, cast metal construction with inch dimensions. When combined with SKF bearings, seals, and related components, it provides a robust and cost-effective solution for rotating equipment in demanding industrial applications, maximizing service life while minimizing maintenance requirements.
Key Features:
- Robust two-piece cast iron design for tough operating conditions
- Customizable configurations with various seal and bearing options
- Cost-efficient bearing housing solution with excellent design quality
- Suitable for both through-shaft and shaft end mounting arrangements
Technical Specifications
1. Dimensions (Metric & Imperial)
| Dimension | Metric | Imperial | Description |
|---|
| Bearing Seat |
|
|
|
| Dₐ | 180 mm | 7.087 in | Diameter of bearing seat |
| G7 | - | - | Tolerance class of bearing seat diameter |
| Cₐ | 55.804 mm | 2.197 in | Width of bearing seat |
| Shaft |
|
|
|
| dₐ | 87.313 mm | 3.4375 in | Shaft diameter (compatible) |
| Centre Heights |
|
|
|
| H₁ | 114.3 mm | 4.500 in | Centre height (pillow block) |
| Outside Dimensions |
|
|
|
| A₁ | 111.125 mm | 4.375 in | Foot width |
| A₂ | 153.194 mm | 6.031 in | Overall width |
| H | 217.488 mm | 8.5625 in | Overall height |
| H₂ | 44.45 mm | 1.750 in | Foot height |
| L | 387.35 mm | 15.250 in | Overall length |
| Bolt Holes |
|
|
|
| J (min) | 295.275 mm | 11.625 in | Distance between attachment bolts (min) |
| J (max) | 333.375 mm | 13.125 in | Distance between attachment bolts (max) |
| J₁ | 60.325 mm | 2.375 in | Distance between attachment bolts (axial) |
| N₁ | 22.225 mm | 0.875 in | Width of attachment bolt hole |
| Attachment bolt diameter | 19.05 mm | 3/4 in | Recommended bolt diameter |
| Threaded Holes |
|
|
|
| R₁ | 58.738 mm | 2.3125 in | Distance of drain plug from centre |
| R₂ | 30.163 mm | 1.1875 in | Height of drain plug position |
| RG | - | 3/8-18 NPT | Thread of drain hole |
| PG | - | 1/4-18 NPT | Thread of grease fitting in cap |
2. Housing Properties
| Property | Specification |
|---|
| Housing type | Split plummer (pillow) block |
| Housing configuration | Two-piece |
| Mounting arrangement | Through shaft/Shaft end |
| Number of bolt holes for fasteners | 4 |
| Bearing housing seal type | Labyrinth |
| Housing lubrication feature | Grease/Oil compatible |
| Product net weight | 21.5 kg |
| eClass code | 23-05-17-01 |
| UNSPSC code | 31171519 |
3. Materials & Corrosion Protection
| Component | Material/Specification |
|---|
| Housing material | Cast iron |
| Corrosion protection | Paint - compliant with ISO 12944-2, corrosivity category C2 |
| Cap bolt specification | 3/4-10 UNC x 4 |
| Number of cap bolts | 2 |
| SAE grade of cap bolt | 5 |
4. Mounting & Operational Information
| Parameter | Value |
|---|
| Recommended tightening torque for cap bolts | 203.373 N·m |
| Width of included locating ring | 9.728 mm |
| Initial grease fill (20% of housing volume) | 340.194 g |
| Initial grease fill (40% of housing volume) | 526.167 g |
5. Recommended Safe Loads
| Load Type | Value |
|---|
| Safe load at 60° load angle (P60°) | 119 kN |
| Safe load at 90° load angle (P90°) | 71.2 kN |
| Safe load at 120° load angle (P120°) | 44.5 kN |
| Safe load at 150° load angle (P150°) | 40 kN |
| Safe load at 180° load angle (P180°) | 48.9 kN |
| Safe axial load (Pa) | 31.8 kN |
6. Compatible Components
| Component | SKF Part Number |
|---|
| PosiTrac labyrinth seal | 2 x LOR 102 |
| Locating (stabilizing) ring | SR-20-17 |
| Recommended end cover (end plug) | EPR 12 |
Typical Applications
- Conveyor systems
- Pulp and paper processing equipment
- Mining machinery
- Aggregate processing plants
- General industrial rotating equipment
