TIMKEN QAPF18A085SM - Solid-Block Spherical Roller Bearing Unit 85 mm

TIMKEN QAPF18A085SM is a heavy-duty solid-block mounted spherical roller bearing unit with an 85 mm cylindrical bore and 4-bolt base mounting. The unit uses a spherical roller bearing, a cast-steel housing, a single concentric locking collar and a triple-lip M seal. The QAPF configuration is a fixed, non-expansion bearing unit designed for demanding industrial mounted-bearing applications.

Technical Data - TIMKEN QAPF18A085SM

Manufacturer: TIMKEN
Designation: QAPF18A085SM
Product type: Mounted spherical roller bearing unit
Housing style: Heavy Duty S2000 solid block
Bearing type: Spherical roller bearing
Bearing series: 22218
Shaft diameter: 85 mm
Bore type: Cylindrical
Mounting: 4-bolt base
Locking system: Single concentric locking collar
Seal: Triple-lip M seal
Expansion type: Non-expansion / fixed
Housing material: Cast steel
Housing finish: Powder coated
Maximum speed: 1,400 rpm
Dynamic load capacity: 355 kN
Static load capacity: 388 kN

Main Dimensions

Bore diameter: 85 mm
Overall length: 312.4 mm
Overall width: 113.5 mm
Overall height: 195.3 mm
Base to bore centreline: 95.3 mm
Base width: 95.3 mm
Bolt centre-to-centre range: 225.6 to 276.4 mm

These mounting dimensions are particularly important when replacing an existing solid-block bearing unit because shaft diameter alone does not determine interchangeability.

Spherical Roller Bearing Construction

The QAPF18A085SM incorporates a double-row spherical roller bearing in a one-piece cast-steel housing. This bearing design is intended for applications involving substantial radial loads and can accommodate angular misalignment resulting from shaft deflection or mounting conditions.

TIMKEN identifies the bearing size associated with the 85 mm unit as the 22218 series.

Concentric Collar Locking System

The unit uses a single concentric collar to secure the bearing to the 85 mm shaft. The locking collar uses set screws positioned to provide positive shaft locking while controlling runout.

This locking method is an important identification feature of the QAPF18A085SM and should be considered when comparing alternative mounted bearing units.

Triple-Lip M Seal

TIMKEN QAPF18A085SM is equipped with a triple-lip M seal.

The contacting seal arrangement is designed to provide additional protection against contaminants in demanding operating environments. The sealing material is nitrile rubber, making the sealing configuration suitable for many industrial environments where moisture and dirt are present.

Fixed Non-Expansion Configuration

The QAPF18A085SM is a non-expansion, fixed bearing unit. This means it is intended to axially locate the shaft at the bearing position.

In installations using both fixed and expansion bearing positions, the correct configuration must therefore be verified before replacement. A dimensionally similar expansion unit should not automatically be considered equivalent.

Load Ratings and Speed

Key operating values for the QAPF18A085SM are:

Dynamic load capacity: 355 kN
Static load capacity: 388 kN
Maximum speed: 1,400 rpm

These parameters should be considered together with shaft load, operating speed, lubrication, alignment and environmental conditions when selecting the unit.

Industrial Applications

The solid-block spherical roller bearing design is suitable for heavy-duty mounted bearing arrangements such as:

• conveyors
• bulk material handling equipment
• industrial fans
• processing machinery
• mining and aggregate equipment
• heavy drive systems
• production machinery
• industrial shaft assemblies

Actual suitability depends on the loads, speed, shaft arrangement, operating temperature and environmental conditions of the application.

Identification and Replacement Data

When identifying TIMKEN QAPF18A085SM, verify:

Brand: TIMKEN
Part number: QAPF18A085SM
Shaft: 85 mm
Bearing series: 22218
Housing: Solid block, cast steel
Mounting: 4-bolt base
Locking: Single concentric collar
Seal: Triple-lip M
Configuration: Fixed / non-expansion
Maximum speed: 1,400 rpm

The official TIMKEN CAD catalogue confirms the QAP18A085S family as an 85 mm mounted bearing based on bearing number 22218, with QAP18A085SM included among the complete TIMKEN part-number variants.

FAQ - TIMKEN QAPF18A085SM

What is TIMKEN QAPF18A085SM?
It is a heavy-duty solid-block mounted spherical roller bearing unit with an 85 mm cylindrical bore and four-bolt base.

What shaft diameter fits QAPF18A085SM?
The nominal shaft diameter is 85 mm.

What bearing series is used in this unit?
The corresponding spherical roller bearing series is 22218.

What are the overall dimensions?
The unit measures approximately 312.4 mm long, 113.5 mm wide and 195.3 mm high.

What is the dynamic load capacity?
The specified dynamic load capacity is 355 kN.

What is the static load capacity?
The specified static load capacity is 388 kN.

What is the maximum speed?
The listed maximum operating speed is 1,400 rpm.

Is QAPF18A085SM a fixed or expansion unit?
It is a fixed, non-expansion bearing unit.