TIMKEN 387-2 Single Row Tapered Roller Bearing Single Cone, Imperial Series, 2.2500in Bore, 0.8640in Width, Cylindrical Bore, Steel Cage, Precision ABMA Class 2.
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Timken
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Key Features
- Available in single, double and multi-row configurations, as well as proprietary sizes
- Designed in collaboration with OE engineers to design, engineer and test bearings for premium performance in many applications
- Power dense designs allow for heavier loads and can help extend bearing life
- Optimized internal geometry lower torque and operating temperatures to extend lubrication system life
- Can be designed to withstand high-corrosive, high-temperature and vacuum or low-lubrication environments with proprietary enhancements
Description
Timken® Tapered Roller Bearings
Timken® Tapered Roller Bearings are engineered for precision, durability, and performance under demanding conditions. Designed with a unique geometry that combines a tapered inner and outer raceway with tapered rolling elements, these bearings are built to manage both radial and axial loads efficiently — even in the most challenging environments.
Each Timken bearing is manufactured to exacting standards using premium steel and advanced heat-treatment processes, ensuring superior wear resistance, low friction, and consistent performance. The optimized internal design allows for accurate alignment and high load-carrying capacity, making them ideal for applications in heavy machinery, automotive axles, gearboxes, agricultural equipment, and industrial power transmission systems.
Timken’s proprietary surface finishing and precision tolerances help reduce operating temperatures and extend bearing life. Available in single-row and double-row configurations, Timken tapered roller bearings deliver dependable operation, smooth rotation, and exceptional longevity.
Specifications
Key Dimensions
| Rolling Element | Tapered |
| Bore Size (ID) | 2.2500 in / 57.150 mm |
| Overall Width | 0.8640 in / 21.946 mm |
Performance
| Precision Class | ABMA Class 2 |
| Relubricatable | No |
| Relubrication Feature | None |
Properties
| Bearing Type | Unmounted Roller Bearing |
| Bore Type | Cylindrical |
| Row Type | 1 |
| Material - Rolling Elements | Steel |
| Cage Type | Stamped Window |
| Cage Material | Steel |
| Bearing Material | Steel |
| Inner Ring Width | 0.8640 in / 21.946 mm |
| Component | Inner Ring |
| Assembly Components | Single Cone |
Mounting Dimensions
| Maximum Shaft Fillet Radius | 0.090 in / 2.30 mm |
How to Read a Timken Bearing Number
Timken uses two designation systems. Metric bearings follow the ISO standard — multiply the last two digits by 5 for bore diameter (special codes: 00=10mm, 01=12mm, 02=15mm, 03=17mm). Inch tapered roller bearings use Timken's own system with a duty-class prefix, angularity digit, and separate part numbers for the cone (inner ring + rollers + cage) and cup (outer ring). Suffixes are separated by spaces or dots.
LM11949 / LM11910
LM Light-Medium duty • 11949 Cone (inner ring) • 11910 Cup (outer ring) • Inch tapered roller bearing SET 2
22311 EMB W33 C3
223 Spherical roller, series 23 • 11 55mm bore • EMB Extended capacity brass cage • W33 Lubrication groove + 3 holes • C3 Greater than normal clearance
Prefixes & Type Codes
Bearing Type Codes (First Digit — Metric)
| Code | Bearing Type |
|---|---|
| 0 | Double row angular contact ball bearing |
| 1 | Self-aligning ball bearing |
| 2 | Spherical roller bearing |
| 3 | Tapered roller bearing (metric) |
| 4 | Double row deep groove ball bearing |
| 5 | Thrust ball bearing |
| 6 | Single row deep groove ball bearing |
| 7 | Single row angular contact ball bearing |
| 8 | Cylindrical roller thrust bearing |
Tapered Roller — Assembly Types
| Code | Assembly Type |
|---|---|
| TS | Single row — one cone + one cup |
| TSF | Single row with flanged cup |
| TSL | Single row with DUO-FACE Plus seal |
| TDO | Two-row, double outer ring (one double cup + two cones) |
| TDI | Two-row, double inner ring (one double cone + two cups) |
| TDIT | TDI with tapered bore for adapter mounting |
| TNA | Two-row, non-adjustable (inner ring faces abut) |
| TQO | Four-row, straight bore |
| TQOW | Four-row with cone face lubrication slots |
| TQI | Four-row, mixed cone configuration |
| TQIT | Four-row with tapered bore |
| 2TS-IM | Two TS bearings, indirect mounting with spacers |
| 2TS-DM | Two TS bearings, direct mounting (inner rings abutting) |
| SR | SET-RIGHT — two TS bearings with automated preset |
Tapered Roller — Duty Class (Inch System)
| Prefix | Duty Class |
|---|---|
| EL | Extra Light |
| LL | Light-Light (lighter than light) |
| L | Light |
| LM | Light-Medium |
| M | Medium |
| HM | Heavy-Medium |
| H | Heavy |
| HH | Heavy-Heavy (heavier than heavy) |
| EH | Extra Heavy |
Cone & Cup Terminology
| Term | Meaning |
|---|---|
| Cone | Inner ring assembly (inner ring + rollers + cage) — odd-numbered suffix |
| Cup | Outer ring — even-numbered suffix |
| D | Double cone or double cup |
| DA | Double cone or spherical OD double cup |
| DD | Special long double cone or cup |
| P | Puller groove in cone bore |
| G | Retainer groove in cone bore |
| SC | Square bore cone |
Cylindrical Roller Bearings
| Prefix | Configuration |
|---|---|
| NU | Outer ring two flanges, inner ring without flanges — radial load only |
| NJ | Inner ring one flange, outer ring two flanges — radial + one-direction axial |
| NUP | Outer ring two flanges, inner ring one flange + loose rib — light axial both directions |
| N | Inner ring two flanges, outer ring without flanges |
| NF | Inner ring without flanges, outer ring two flanges |
| NCF | Full complement (no cage) — maximum roller count, highest load capacity |
| RY / RX | Four-row cylindrical roller (rolling mill applications) |
Spherical Roller Bearing Series
| Series | Description |
|---|---|
| 222xx | Width series 2, light diameter |
| 223xx | Width series 2, medium diameter |
| 230xx | Width series 3, extra-light diameter |
| 231xx | Width series 3, light diameter |
| 232xx | Width series 3, medium diameter |
| 239xx | Width series 3, extra-wide |
| 240xx | Width series 4, extra-light diameter |
| 241xx | Width series 4, light diameter |
Needle Roller & Cam Followers
| Prefix | Type |
|---|---|
| HK | Drawn cup needle roller bearing, open ends (metric) |
| BK | Drawn cup needle roller bearing, closed end (metric) |
| B / J | Drawn cup needle roller bearing (inch) |
| NA | Machined needle roller bearing with inner ring |
| NK | Machined needle roller bearing without inner ring |
| IR | Separate inner ring for needle roller bearings |
| CR | Standard cam follower (stud type) |
| CRS | Cam follower, sealed |
| CRH | Cam follower, heavy series |
| YCR | Yoke roller (straddle mount) |
Thrust & Housed Unit Prefixes
| Prefix | Type |
|---|---|
| TVL | Angular contact ball thrust, single direction |
| DTVL | Angular contact ball thrust, double (both directions) |
| TP | Cylindrical roller thrust |
| TTHD | Heavy-duty tapered roller thrust |
| UCP | Pillow block housed unit, two-bolt |
| UCF | Four-bolt circular flange housed unit |
| UCFL | Two-bolt rectangular flange housed unit |
| UCT | Take-up unit (adjustable frame) |
| SAF | Split-block pillow block (spherical roller) |
| SNT | Plummer block housing |
Suffixes
Seals & Shields
| Suffix | Meaning |
|---|---|
| Z | Metal shield on one side |
| ZZ | Metal shields on both sides |
| RS | Contact (lip) seal on one side |
| 2RS | Contact (lip) seals on both sides |
| RZ | Non-contact (gap) seal on one side |
| 2RZ | Non-contact (gap) seals on both sides |
| L | DUO-FACE seal assembly (tapered roller bearings) |
| P / PP | Seals on one / both sides (angular contact types) |
Internal Clearance
| Suffix | Meaning |
|---|---|
| C2 | Clearance less than Normal |
| C0 | Normal clearance (default — usually omitted) |
| C3 | Clearance greater than Normal |
| C4 | Clearance greater than C3 |
| C5 | Clearance greater than C4 (loosest) |
Cylindrical roller clearance codes: R1 (tightest) • R2 • R3 (normal) • R4 • R5 (loosest)
Cage / Retainer Type
| Suffix | Meaning |
|---|---|
| M | Machined brass cage |
| TN1 | Polymer (polyamide / nylon) cage |
| EJ | Extended capacity, stamped nitrided steel cage (window type) |
| EM | Extended capacity, machined brass cage (finger type) |
| EMB | Brass cage, finger type, land piloted (spherical roller) |
| YM | One-piece brass cage, roller piloted (spherical roller) |
| YMB | One-piece brass cage, land piloted (spherical roller) |
| YMD | Two-piece brass cage, rows rotate independently (spherical roller) |
| PRC | Moulded reinforced nylon cage (super precision) |
| CR | Phenolic laminate cage (super precision) |
| MBR | Machined bronze retainer (super precision) |
Internal Design & Modifications
| Suffix | Meaning |
|---|---|
| A | Bore, radius, OD, or length differs from standard |
| C | Dimensionally different, non-interchangeable |
| E | Special characteristics, non-interchangeable |
| F | Polymer cage assembly (tapered roller) |
| H | Special cage, rollers, or internal geometry |
| CP | Flash chrome plated, otherwise interchangeable |
| HR | Hydra-rib cup (fluid-controlled roller guidance) |
| W800 | Vibratory / shaker screen modification (tighter tolerances, brass cage, upper C4 clearance) |
Snap Ring, Bore & Flange
| Suffix | Meaning |
|---|---|
| N | Snap ring groove in outer ring |
| NR | Snap ring groove with snap ring installed |
| K | Tapered bore, taper 1:12 (spherical roller) |
| K30 | Tapered bore, taper 1:30 |
| T | Tapered bore cone / tapered OD cup (tapered roller) |
| RB | Snap ring on OD of cup |
| B | Flanged cup (tapered roller) |
| X | Dimensions modified to ISO standard |
Tolerance / Precision Class
| Class | Meaning |
|---|---|
| #4 | Standard (least precise — inch tapered roller) |
| #2 | Standard, tighter than #4 |
| #3 | Precision — automotive grade (copper dot marking) |
| #0 | Precision — tighter than #3 |
| #00 | High precision |
| #000 | Ultra-high precision (tightest — inch tapered roller) |
ISO classes (metric): P0 (normal) • P6 (ABEC-3) • P5 (ABEC-5) • P4 (ABEC-7) • P2 (ABEC-9)
Heat Stabilization
| Suffix | Max Operating Temperature |
|---|---|
| S1 | Up to 200 °C (392 °F) |
| S2 | Up to 250 °C (482 °F) |
| S3 | Up to 300 °C (572 °F) |
| S4 | Up to 350 °C (662 °F) |
Materials
| Code | Meaning |
|---|---|
| (standard) | Case-carburized steel — hard surface, tough ductile core (Timken signature) |
| XX | Special steel cone or cup |
| XP | Special steel and process |
| DV | Double part in special steel |
| H / A | Stainless steel (deep groove / angular contact ball bearings) |
Lubrication Features
| Suffix | Meaning |
|---|---|
| W33 | Annular groove + three lubrication holes in outer ring |
| W30B | Face slots on inner ring for lubrication |
| W22 | Reduced tolerance on outside diameter |
| W45A | Tapped holes on outer ring face |
| S | Lubrication groove + 3 holes in outer ring (spherical roller) |
Matched Sets & Mounting
| Code | Meaning |
|---|---|
| DB | Back-to-back mounting (O arrangement) |
| DF | Face-to-face mounting (X arrangement) |
| DT | Tandem arrangement |
| SET | Matched cone + cup set (automotive wheel bearings, e.g. SET2, SET45) |
| SUL / DUL | Light preload — single / duplex (super precision) |
| SUM / DUM | Medium preload — single / duplex (super precision) |
| SUH / DUH | Heavy preload — single / duplex (super precision) |
Special Product Lines
| Name | Description |
|---|---|
| UNIPAC | Pre-set, pre-sealed, pre-lubricated two-row tapered roller package |
| MileMate | Premium matched cup/cone sets for commercial vehicle wheels |
| SET-RIGHT | Automated preset bearing assemblies |
| AP / AP-2 | Integrated pre-assembled, pre-lubricated bearing for rail/industrial |
| DUO-FACE | Integral seal system for tapered roller bearings |
| 454-Series | Enhanced surface finish for fuel efficiency |
| EnviroSpexx | Energy-efficient roller bearings, optimized internal geometry |
Need help choosing the right Timken bearing? Call us at 1 (248) 429‑9073 or use the chat below.
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