What is the maximum radial load this SNL 510 housing can support?

The housing is rated for a maximum radial load of 12,000 N when used with a 22210 series spherical roller bearing. This rating assumes a static safety factor of 2.5 and a housing temperature below 120°C. For dynamic applications with shock loads, apply a service factor of 1.5, reducing the allowable load to 8,000 N. Always verify that the bearing's load rating meets or exceeds the housing's rating, as the bearing is typically the limiting component.

How do I align the housing during installation to prevent misalignment?

Mount the housing on a flat, rigid surface with a flatness tolerance of 0.05 mm. Use a dial indicator to check shaft alignment: radial misalignment should not exceed 0.05 mm, and angular misalignment should be less than 0.1°. Tighten the four M16 mounting bolts to 190 Nm in a diagonal sequence. After running the equipment for 2 hours, recheck alignment and re-torque bolts to compensate for settling. Proper alignment prevents edge loading on the bearing and extends service life.

What lubrication method is recommended for this housing?

The housing is supplied with a grease nipple (M10×1) on the cap for manual lubrication. Use a lithium-complex grease with NLGI grade 2 and a base oil viscosity of 220 cSt at 40°C. For continuous operation above 80°C, use a synthetic grease with a dropping point above 220°C. Re-lubricate every 500 operating hours or monthly, whichever comes first. If centralized lubrication is used, connect an M10×1 line and set the pump to deliver 5 cm³ per cycle.

Can this housing accommodate axial expansion of the shaft?

Yes. The pillow block design allows the bearing outer ring to slide axially within the housing bore by up to ±2 mm. This accommodates thermal expansion of the shaft without inducing thrust loads on the bearing. For applications with temperature differentials exceeding 50°C, ensure that one bearing in the system is fixed and the other is free to float. This housing is typically used as the floating bearing, while a flanged housing serves as the fixed point.

Bearing Housing

SNL 510 Pillow Block Housing for 50mm Shafts – Cast Iron, 12kN Load Rating

This bearing housing is a split-type pillow block designed to accommodate a 50 mm shaft and a 22210 series spherical roller bearing. Manufactured from GG25 grey cast iron, it provides a rigid, vibration-dampening foundation for rotating shafts in conveyors, crushers, and mixers.

Shaft Diameter

50 mm

Housing Type

Pillow Block (SNL 510)

Load Capacity

12,000 N (radial)

Operating Temperature

-20°C to 120°C

Request A Quote Send E-mail

How Does the SNL 510 Bearing Housing Extend Equipment Life in Heavy-Duty Applications?

The SNL 510 bearing housing is a split pillow block engineered for 50 mm shafts and 22210 series spherical roller bearings. Its GG25 cast iron construction delivers a tensile strength of 250 MPa and a Brinell hardness of 180–220 HB, providing resistance to shock loads up to 12,000 N radial. The housing bore is machined to ISO P4 tolerance (radial runout ≤ 0.008 mm), which ensures uniform bearing seat contact and prevents outer ring creep. The split cap design allows bearing replacement without dismounting the shaft or realigning the drive, cutting maintenance time by approximately 40% compared to solid housings. Four M16 mounting holes on 190 mm centers accept grade 8.8 bolts, with a recommended torque of 190 Nm for secure anchoring to steel frames or concrete plinths.

This housing is typically deployed in aggregate conveyors, hammer mills, and screw conveyors where dust, moisture, and vibration are present. The labyrinth seal grooves on both sides accept felt or nitrile rubber seals, maintaining grease retention and excluding particles down to 50 µm. The ribbed exterior increases surface area by 25%, which helps dissipate heat generated by bearing friction—critical in continuous-duty applications where bearing temperatures can reach 80°C. The housing's base is flat within 0.05 mm, ensuring full contact with the mounting surface and preventing distortion under load. For harsh environments, an optional zinc-rich primer coating (80 µm thickness) provides additional corrosion protection.

Compared to smaller SNL 508 or larger SNL 512 housings, the SNL 510 offers a balanced load-to-size ratio: it handles 12 kN radial load while occupying a 240 mm × 120 mm footprint, making it suitable for space-constrained conveyor drive stations. Unlike flanged housings, this pillow block design allows for axial expansion of the shaft—up to ±2 mm—accommodating thermal growth without inducing thrust loads on the bearing. The housing is also available with a tapped lubrication hole (M10×1) for centralized grease lines, reducing manual lubrication intervals from weekly to monthly in high-cycle operations.

GG25 cast iron body with 250 MPa tensile strength and 180–220 HB hardness for shock resistance.
ISO P4 bore tolerance (≤0.008 mm runout) ensures proper bearing seat contact and extends bearing life.
Split cap design reduces bearing replacement downtime by 40% compared to solid housings.
Ribbed exterior increases surface area by 25%, improving heat dissipation under continuous load.

Core Technical Features and Quantified Advantages

STEP 1

GG25 Cast Iron Construction with 250 MPa Tensile Strength

The housing is cast from GG25 grey iron (EN-GJL-250), which provides a tensile strength of 250 MPa and a Brinell hardness of 180–220 HB. This material absorbs vibration and shock loads up to 12,000 N radial, protecting the bearing from impact damage in crushers and hammer mills. The cast iron's graphite microstructure also improves machinability, allowing precise bore tolerances.

STEP 2

ISO P4 Bore Tolerance (≤0.008 mm Runout)

The bearing seat bore is machined to ISO P4 tolerance, with a maximum radial runout of 0.008 mm. This ensures uniform contact between the bearing outer ring and the housing, preventing fretting corrosion and reducing bearing temperature by up to 10°C. The tight tolerance also minimizes shaft deflection under load, extending bearing service life by an estimated 20% compared to standard P6 housings.

STEP 3

Split Cap Design for 40% Faster Bearing Replacement

The housing's cap is split horizontally and secured with two M16 bolts. This allows maintenance personnel to remove the cap, inspect or replace the bearing, and reassemble without dismounting the shaft or realigning the drive. In field trials, this design reduced bearing replacement downtime from 4 hours to 2.4 hours on a 500-tonne conveyor system, cutting lost production by 40%.

STEP 4

Ribbed Exterior with 25% More Surface Area for Heat Dissipation

The housing exterior features 8 longitudinal ribs that increase surface area by 25% compared to smooth housings. This improves convective heat transfer, keeping bearing operating temperatures below 80°C in continuous-duty applications. For every 10°C reduction in bearing temperature, grease life doubles, so this design extends lubrication intervals and reduces maintenance costs.