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Central Surplus Bearing Finder
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
Availability:
1 in stock
Super-precision angular contact ball bearing pair, 45 x 75 x 16 mm, 25° contact angle, open, phenolic cage, medium preload, universally matchable.
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$218.65
1 in stock
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM9109WIDUM |
| GTIN | 087796202436 |
| Model | 2MM 9109 WI CR DUM / 7009 ACD P4A DGB / 7009-A5 |
| Bearing Type | Super-Precision Angular Contact Ball Bearing, Open |
| ID | 45 mm |
| OD | 75 mm |
| Width | 16 mm |
| Material | Chrome Steel |
|---|---|
| Series | Fafnir 3MM9100WI (ISO 70 light series) |
| Base Number | 7009 |
| Industry Terms | Super precision spindle bearing, machine tool bearing, matched duplex pair, phenolic cage angular contact |
| Common Misspellings | Fafner, Fafnier, Fafnir 3MM9109W1, 3MM9109WIDUM bearing |
| Bore Shaft Size | 45 mm (1.7717 in) |
| Mpn Variants | 3MM9109WIDUM, 3MM9109WI-DUM, 3MM-9109-WI-CR-DUM, 3MM9109WICRDUM, 3MM 9109 WI CR DUM |
| Closure Type | Open |
| Rolling Elements | Steel Balls |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Part Number | 3MM9109WI-CR-DUM |
A Timken Fafnir 3MM9109WI-CR-DUM super-precision angular contact ball bearing, supplied as a matched pair. Bore 45 mm, outside diameter 75 mm, width 16 mm per bearing, 32 mm across the assembled pair. Open on both faces, with a fabric-base phenolic cage riding on the outer ring lands.
The leading 3MM sets a 25° contact angle. The MM prefix denotes Fafnir super-precision execution to P4S, equivalent to ABEC 7/9. The 9100 series number decodes to the ISO 70 light series, so 9109 is the ISO 7009 envelope at 45 x 75 x 16 mm. CR is the phenolic outer-land-riding cage. DUM is a universally matchable duplex pair set to medium preload.
A 25° contact angle carries more thrust and tolerates less speed than a 15° bearing of the same envelope, which suits it to machine tool spindles and screw drives where axial stiffness governs. The phenolic cage is light and self-lubricating, allowing higher speed than a machined bronze cage while accepting a lower maximum temperature. Because the pair is preload-set rather than clearance-set, internal clearance is not applicable to it.
Two bearings, sold as a matched set. Universally matchable duplex construction allows the pair to be mounted back-to-back, face-to-face or in tandem, with the flush ground faces producing the specified medium preload when clamped.
The rings are ground for a specific relationship to one another and are kept together as a set. Clamping is applied evenly against the ground faces so that the designed preload is established without distorting the rings.
Same-specification equivalents in other schemes are SKF 7009 ACD/P4A DGB, NSK 7009A5TYNDUMP4 and FAG B7009-E-T-P4S-DUM. A 7009 CD, C or 15° variant shares the envelope but carries a different contact angle and is a related size rather than an interchange.
$26.58
199 in stock
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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Our team can locate, cross-reference, and source all parts.
Our team can locate, cross-reference, and source all parts.
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