64450-64700 bearing: complete specifications & equivalents
The 64450-64700 is a ISO 355 radial bearing sized 114.3 x 177.8 x 41.275 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 114.3 mm |
| Outer diameter D | 177.8 mm |
| Width B | 41.275 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 307 kN |
| Basic static load rating C0 | 415 kN |
| Fatigue load limit Pu | 42.5 kN |
| Reference speed (thermal) | 2800 rpm |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3600 g |
| Manufacturer designation | SKF 64450/64700 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB |
| Last verified | 2026-09-28 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB) · extracted 2026-09-28
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 64000-series range
| Bore d | 4.5 in |
|---|---|
| Outer diameter D | 7 in |
| Width B | 1.625 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 31.8 mm |
| Smallest bore in 64000-series | 110 mm |
| Largest outer diameter in 64000-series | 180 mm |
| Width range across 64000-series | 41.275–41.275 mm |
| Bore position in 64000-series (smallest first) | 2 of 2 |
| Bore above smallest 64000-series size | 4.299999999999997 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 64450-64700-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 114.3×177.8×41.275 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 64450-64700 | Timken | full Dimensions and internal design equivalent — standard interchange. | Same inch-series cone/cup boundary envelope (d/D/T); load ratings and speed limits are brand-specific and may differ. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 64450-64700 model number is decoded
The cup reference 64700 is structural, not a suffix: it identifies the outer ring that, combined with the 64450 cone, produces the 114.3/177.8/41.275 mm envelope catalogue-listed as 64450. Quote the cup number in full when ordering — the 64000-series tables contain other cups that fit the same cone but change the bearing.For a 114.3 mm shaft carrying combined load, SKF lists 64450 under catalogue execution SKF 64450/64700: one open single-row tapered roller bearing in the inch 64000-series.Digit by digit, 64450 reads as cone reference / cup reference in the 64000-series inch series; the 114.3 mm bore, 177.8 mm OD and 41.275 mm width are the metric equivalents of the original inch boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 2,800 r/min thermal reference and 3,400 r/min mechanical limiting speed. Mounting practice for 64450: the rotating cone takes the interference fit (m6 on a 114.3 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing. Speed envelope and thermal behaviour: at 2,800 r/min thermal reference, the 114.3 mm bore shaft runs at a dn of 320k, and the 31.8 mm section dissipates heat through the cup-to-housing contact path; the 3,400 r/min mechanical ceiling reflects cage strength, and the 3600 g spinning cone contributes gyroscopic moment under rapid speed reversal.
Typical equipment & failure modes
Common applications
- wind-turbine main shafts
- marine propulsion gearboxes
- large industrial mixer shafts
- heavy-duty rolling-mill gearboxes
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- false brinelling on idle paired sets exposed to machine vibration
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- rolling-contact fatigue spalling after the rated L10 life is exceeded
Selection pitfalls — read before you substitute
- At 114.3 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.
- The 64000-series inch series at 114.3 mm bore (177.8×41.275 mm) follows the Timken cone/cup convention; substitutions must match both the cone and cup reference exactly — interchanging with another series or a metric 3xxxx bearing of the same bore changes OD, width and contact angle, so re-run the pair setting and shoulder-diameter checks before swapping.
- When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 64450 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
- A single 64450 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.
- The 3600 g mass and 41.275 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 64450.
- The 307/415 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of 64450 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 64450/64700 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Is 64450 interchangeable with other brands?
Inch-series tapered roller bearings follow a long-standing industry boundary plan, so cones and cups of the same basic number are generally dimensionally interchangeable across manufacturers. However, internal geometry, cage design and load ratings differ by brand, so for paired or precision applications keep both halves of the set from one manufacturer — or re-verify ratings and setting when mixing.
What are the dimensions and catalogue data of 64450?
The SKF 64450/64700 is a single-row tapered roller bearing with 114.3 mm bore, 177.8 mm outer diameter and 41.275 mm width (4.5 × 7 × 1.625 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 307 kN, C0 415 kN, fatigue load limit Pu 42.5 kN, reference speed 2,800 r/min, limiting speed 3,400 r/min, mass about 3600 g. It is an open, separable bearing with a pressed-steel cage.
How does the 64450 inch-series designation work?
Inch-series tapered roller bearings use a Timken-style cone/cup convention: the number before the slash identifies the cone (inner ring with roller and cage assembly), the number after the slash identifies the cup (outer ring), and the 64000-series code marks the dimensional series. The metric dimensions 114.3×177.8×41.275 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in 64450 mean?
The cone number (before the slash) identifies the inner ring, rollers and cage; the cup number (after the slash) identifies the outer ring. Both are quoted together because a single-row tapered roller bearing is a matched separable pair — the cone and cup are ground to work together and are not interchangeable with arbitrary other parts. The series prefix (64000-series) groups sizes that share the same boundary-dimension plan.
Can a single 64450 take axial load in both directions?
No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB on 2026-09-28. Read our editorial & correction policy.