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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
Matched duplex pair of 25° super-precision angular contact ball bearings, 30 mm bore x 55 mm OD x 13 mm wide each (26 mm stacked), ABEC 7 with heavy preload — for stiff, accurate machine tool spindle and precision screw-drive positions. Sold as the pair, 2 pieces.
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| MFR / Brand | Fafnir |
|---|---|
| Model | 3MM 9107 WI DUH / B 7007 E T DUH P4 / 7007A5 7007ACD |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 30 mm |
| OD | 47 mm |
| Width | 9 mm |
| Material | Bearing Steel |
|---|---|
| Series | 9100 |
| Base Number | 7006 |
| Industry Terms | Spindle bearing, machine tool bearing, precision duplex pair, matched set angular contact, heavy preload spindle set |
| Common Misspellings | Fafner, Faffnir, Fafnier, 3MM9106W1, 3MM 9106WL DUH |
| Application Types | Machine tool spindles, grinding spindles, precision ball screw drives, rotary tables |
| Bore Shaft Size | 30 mm |
| Mpn Variants | 3MM9106WI-DUH, 3MM9106WIDUH, 3MM-9106-WI-DUH, 3MM 9106 WI DUH, MM9106WI |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing (duplex pair) |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.68 |
| Part Number | 3MM9106WI-DUH |
A matched duplex pair of Fafnir 3MM9106WI super-precision angular contact ball bearings, universally ground for heavy preload (DUH). Each bearing is 30 mm bore x 55 mm OD x 13 mm wide, so the pair stacks to 26 mm overall. The 9100WI line is Fafnir’s light-section spindle series on the 7006 envelope, intended for machine tool spindles, grinding heads and precision screw drives.
3MM — Fafnir super-precision series, 25° contact angle.
The MM prefix implies ABEC 7/9 (P4S) tolerance class, not plain P4.
9106 — 9100 light-section series, 7006 envelope, 30 x 55 x 13 mm.
WI — super-precision spindle bearing design.
DUH — duplex, universally ground, heavy preload.
Heavy preload is the stiffness end of the range: it holds the shaft firmly against axial deflection and gives the best positioning accuracy under load, at the cost of more internal friction, more heat and a lower practical speed limit than light or medium preload. The 25° contact angle carries substantially more thrust than a 15° bearing of the same size. Pick DUH only if the spindle design calls for it — fitting a heavy-preload pair where a light one belongs will run hot.
Bore: 30 mm.
Outside diameter: 55 mm.
Width: 13 mm each bearing.
Total width mounted as a pair: 26 mm.
Contact angle: 25°.
Tolerance class: ABEC 7/9 (P4S).
Preload: heavy (H).
Rows: single row each, mounted as a duplex pair.
Closure: open.
Bore type: straight.
Cage: phenolic.
Bearing material: bearing steel.
Dynamic load rating: 13.8 kN.
Static load rating: 9.9 kN.
Limiting speed: 23000 rpm.
Operating temperature range: -30 °C to 120 °C.
Item weight: 0.18 lbs.
Harmonization code: 8482.10.50.68.
Two bearings, supplied as the factory-matched set. Universally ground rings allow back-to-back (DB), face-to-face (DF) or tandem (DT) mounting while still producing the intended heavy preload. Keep the pair together — the preload lives in the matched grind, not in a spacer, so a split set or a mixed set gives an unknown preload.
Same-specification alternatives are 7006-envelope 25° ABEC 7 heavy-preload duplex sets, and the 3MM9106WIDUH / 3MM-9106-WI-DUH forms of this number. Related sizes that are NOT drop-in: 2MM9106WI is the same envelope at 15°, and DUL/DUM carry light or medium preload. A 7006A in the NSK scheme is 30° and a different part.
$231.30
29 in stock
$231.30
29 in stock
Rockwell’s own product page for the Kinetix 6000 is down
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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