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Central Surplus Bearing Finder
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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1 in stock
Super-precision deep groove ball bearing, 90 x 190 x 43 mm, P4S (ABEC 7/9), open, CN clearance, 63 heavy series. Chrome steel, metric.
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$468.74
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| MFR / Brand | Fafnir |
|---|---|
| MPN | MM318K |
| Model | MM-318-K / 6318 / P4S / ABEC 7-9 |
| Bearing Type | Ball Bearing |
| ID | 90 mm |
| OD | 190 mm |
| Width | 43 mm |
| Material | Chrome steel |
|---|---|
| Base Number | 6318 |
| Industry Terms | super precision ball bearing; spindle bearing; ABEC 7 deep groove; precision deep groove bearing; machine tool bearing |
| Application Types | Precision spindles; grinding and boring heads; precision gearboxes; instrument drives |
| Bore Shaft Size | 90 mm |
| Mpn Variants | MM318K; MM-318-K; MM 318 K; M318K; M-318-K; MM318; 318K |
| Manufacturer Status | Legacy Fafnir designation; Fafnir super-precision production passed to The Timken Company |
| Number Of Rows | 1 |
| Part Number | MM318K |
| Series | Fafnir MM300 super-precision / ISO 63 heavy dimension series |
Fafnir MM318K super-precision deep groove ball bearing. Bore: 90 mm. Outside Diameter: 190 mm. Overall Width: 43 mm. Base Number: 6318. Precision Class: P4S (ABEC 7/9). Series: 63 heavy dimension series. Number Of Rows: 1. Rolling Elements: Balls. Closure Type: Open. Internal Clearance: CN (normal). Material: Chrome steel. Design Units: Metric. Fafnir super-precision production passed to The Timken Company.
MM is Fafnir’s super-precision spindle-bearing prefix and carries Precision Class P4S, ABEC 7/9.
The 3 gives the 63 heavy dimension series. The 18 is the bore code, giving a 90 mm bore and the 6318 envelope at 90 x 190 x 43 mm.
K is a Fafnir configuration suffix. Searchable forms: MM318K, MM-318-K, MM 318 K, M318K, M-318-K, MM318, 318K.
A super-precision deep groove bearing carries radial load with modest thrust in either direction while holding the running accuracy of a spindle bearing. P4S holds bore and outside diameter tolerance, width variation and radial and axial runout to close limits, so the shaft runs truer and the assembly generates less vibration at speed. That suits grinding and boring spindles, precision gearboxes and instrument drives.
The 63 heavy series carries more load in the same bore than the equivalent 62 or 60 series, being wider and larger in outside diameter with bigger balls. It trades speed capability and radial space for capacity.
CN clearance is the normal internal clearance range, the general-purpose setting for a shaft and housing at standard interference fits.
Unit Quantity: 1 Pc. Single row, open on both faces.
Base Number: 6318, 90 x 190 x 43 mm. Legacy Fafnir MM numbers cross to Timken’s later super-precision numbering. A commercial-grade 6318 shares the same envelope at a coarser tolerance class. A 6314 at 70 x 150 x 35 mm is a related size. Also written MM318K, MM-318-K, MM 318 K, M318K, M-318-K, MM318 and 318K.
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A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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