SN Series
SN Series
Engineering Classification of SN Series Plummer Block Housings: Heavy-Duty Applications & Standards
SN Series Split Plummer Block Housings (Pillow Blocks) are fundamental mechanical assemblies engineered for heavy-duty industrial applications. Characterized by their modular split-housing design (separate cap and base), they significantly simplify mounting, maintenance, relubrication, and bearing inspection in continuous operating environments.
In this engineering guide from Kamyar Gostar Iranian Industrial Group (DKFL), we explore the structural classifications, metallurgy, sealing options, and technical criteria for selecting SN housings.
1. Classification & Key Technical Features
- SN 500 and SN 600 Series: Designed for mounting bearings on stepped or straight shafts using adapter sleeves (H-series). Optimized for medium to heavy radial and axial loads.
- SN 200 and SN 300 Series: Configured for direct cylindrical bore bearing mounting directly onto stepped shafts without intermediate sleeves.
- Two-Piece Split Architecture: The base and cap are securely locked via two high-tensile cap bolts, enabling quick replacement of internal components without shaft dismounting.
- Bearing Versatility: Engineered to accommodate self-aligning ball bearings (12xx, 22xx series) and spherical roller bearings (222xx, 223xx series) for superior alignment compensation.
2. Metallurgical Quality & Sealing Solutions
DKFL manufactures SN series housings using high-grade grey cast iron (HT200 / GG20) and ductile iron (GGG40 for severe shock-load scenarios), delivering superior vibration damping and load-bearing capacity. Standard sealing arrangements include felt strip seals, double labyrinth seals (TS), and V-ring contact seals to provide robust protection against dust, water spray, and abrasive contaminants.
3. Technical Data: SN 500 Selection Matrix
| Housing Code | Shaft Dia. d1 (mm) | Matched Bearing (Tapered) | Adapter Sleeve | Mounting Bolt |
|---|---|---|---|---|
| SN 506 | 25 | 1206 K / 22206 K | H 206 / H 306 | M12 |
| SN 508 | 35 | 1208 K / 22208 K | H 208 / H 308 | M12 |
| SN 510 | 45 | 1210 K / 22210 K | H 210 / H 310 | M16 |
| SN 512 | 55 | 1212 K / 22212 K | H 212 / H 312 | M16 |
| SN 515 | 65 | 1215 K / 22215 K | H 215 / H 315 | M20 |
4. Primary Industrial Applications
- Mining & Steel Plants: Crushers, vibrating screens, and bulk material handling conveyor systems under extreme loads.
- Cement & Aggregates: Rotary kilns and milling machinery requiring high resistance to abrasive ambient dust.
- Heavy Industrial Fans & Blowers: High-speed rotor shafts demanding continuous thermal dissipation and rigid support.
- Pulp & Paper Machinery: Drive rollers and processing cylinders subjected to constant heavy radial loads.