Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
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Super-precision angular contact ball bearing, 100 x 150 x 24 mm, 15° contact angle, single bearing, open both faces.
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$339.18
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Here are some other options that might fit your project — cross-referenced equivalents and similar parts we have in stock and ready to ship. Need help choosing? Call 585-295-7880.
Angular Contact Ball Bearing — Super-Precision, 100 mm ID, 150 mm OD, 24 mm Width, 15° Contact Angle, Extra Light Preload, P4A, Matched Pair$757.32
Angular Contact Spindle Bearing - 100 mm ID, 150 mm OD, 24 mm Width, 15° Contact Angle, ABEC 7 / P4, Phenolic Cage, Light Preload$351.68
Super Precision Angular Contact Ball Bearing - Straight Bore, 100 mm ID, 150 mm OD, 24 mm Width, Open, 15° Contact Angle, Light Preload, Universally Ground$346.83
Super-Precision Angular Contact Ball Bearing - Straight Bore, 100 mm ID, 150 mm OD, 24 mm Width, Open, 25° Contact Angle, Medium Preload, Phenolic Cage.$141.97| MFR / Brand | Fafnir |
|---|---|
| MPN | 2MM9120WI |
| Model | 2MM 9120 WI |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 100 mm |
| OD | 150 mm |
| Width | 24 mm |
| Material | High Carbon Chrome Steel |
|---|---|
| Series | 9100 Series |
| Lubricant | Preserved |
| Preload | Light Preload |
| Base Number | 2MM9120WI |
| Industry Terms | super precision bearing, spindle bearing, machine tool bearing, precision angular contact, ABEC 7 bearing, 15 degree bearing |
| Common Misspellings | Fafner, Faffnir, Fafnier, 2MM912OWI, 2MM9120WL, 2MM 91 20 WI |
| Application Types | Machine tool spindles, grinding heads, milling heads, precision gearboxes, rotary tables |
| Bore Shaft Size | 100 mm (3.937 in) |
| Mpn Variants | 2MM9120WI, 2MM-9120-WI, 2MM 9120 WI, 2MM9120, MM9120WI, 9120WI |
| Arrangement Configuration | Single bearing, not a matched set |
| Precision Class | ABEC 7/9 (P4S) |
| Additional Attributes | ISO envelope 7020; Fafnir leading 9 denotes the ISO 70 light series |
| Closure Type | Open |
| Min Temp | -30°C |
| Dynamic Load Rating | 83.6 kN / 18800 lbf |
| Static Load Rating | 77.4 kN / 17400 lbf |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Max Temp | 100°C |
| Item Weight | 2.86 lbs |
| Cage Material | Phenolic |
| Limiting Speed | 8300 rpm |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 15 degrees |
| Design Units | Metric |
| Bearing Material | Through-hardened bearing steel |
| Running Accuracy | P4S |
| Part Number | 2MM9120WI |
| Running Accuracy Radial And Axial Runout | P4S |
| Cross Reference 1 | 7020 C (ISO base, 15 deg) |
|---|---|
| Cross Reference 2 | Timken 2MM9120WI (Fafnir is a Timken brand) |
| Cross Reference 3 | SKF 7020 CD/P4A |
| Cross Reference 4 | FAG B7020C.TPA.P4S |
A Fafnir 2MM9120WI super-precision angular contact ball bearing in the 100 x 150 x 24 mm envelope, ISO base number 7020. Single row, 15° contact angle, open on both faces.
2MM — 15° contact angle in the Fafnir scheme.
MM prefix — Fafnir super-precision class, equivalent to ABEC 7/9 (P4S).
9 — ISO 70 light series.
120 — size code for the 100 mm bore, 150 mm outside diameter section.
A single-row angular contact ball bearing carries thrust in one direction together with a radial load. At 15° the thrust capacity is lower than a 25° or 40° bearing of the same envelope, and the limiting speed and heat behaviour are better, which is why the 15° form is standard at the fast end of a machine tool spindle. The light 70-series section keeps ring mass and centrifugal ball loading down. ABEC 7/9 holds bore, outside diameter and raceway runout to a few microns, which is what keeps spindle runout inside tolerance at speed.
Bore: 100 mm (3.937 in)
Outside diameter: 150 mm (5.906 in)
Width: 24 mm (0.945 in)
Rows: 1
Contact angle: 15°
Precision class: ABEC 7/9 (P4S)
Series: ISO 70 light
Rolling elements: balls
Closure: open, both faces
Sale unit is 1 Pc, a single bearing. The designation carries no duplex or preload suffix, so this bearing is not part of a ground matched set.
The inner ring seats with light interference on a ground shaft and the outer ring to a close fit in the housing, both clamped square against faces perpendicular to the axis. Two of these bearings set back-to-back locate a shaft in both directions; a single bearing needs a second opposed bearing in the arrangement to take return thrust.
ISO envelope 7020 at 15°, super-precision class — equivalents include SKF 7020 CD/P4A, NSK 7020CTYP4 and FAG B7020C.TPA.P4S. The 25° and 40° forms in this envelope, 7020 AC and 7020 B, are related sizes rather than interchanges, as is any normal-tolerance 7020.
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