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Availability:
51 in stock
Super-precision angular contact ball bearing, 60 x 85 x 13 mm, 25° contact angle, phenolic cage, universally ground duplex light-preload pair.
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$283.59
51 in stock
51 in stock
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM9312WIDUL |
| Model | 3MM 9312 WI CR DUL 71912-A |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 60 mm |
| OD | 85 mm |
| Width | 13 mm |
| Material | Bearing Steel |
|---|---|
| Series | 3MM9300WI |
| Condition | New |
| Preload | Light Preload |
| Base Number | 3MM9312WI |
| Industry Terms | super precision bearing, spindle bearing, machine tool bearing, ball screw support bearing, matched pair, precision angular contact |
| Common Misspellings | Fafner, Faffnir, Fafnier, 3MM9312WL, 3MM9312W1, 3MM931 2WI |
| Application Types | Machine tool spindles, grinding spindles, ball screw ends, precision rotary tables, high-speed gearboxes |
| Total Width | 26 mm (1.024 in) for the duplex pair |
| Bore Shaft Size | 60 mm (2.362 in) |
| Mpn Variants | 3MM9312WI-DUL, 3MM9312WIDUL, 3MM-9312-WI-CR-DUL, 3MM9312WICRDUL, 3MM 9312 WI CR DUL, 3MM9312WI |
| Arrangement Configuration | Duplex, universally ground (DUL) |
| Precision Class | ABEC 7/9 (P4S) |
| Additional Attributes | ISO envelope 71912; universally ground so pair orientation is selectable at assembly |
| Dynamic Load Rating | 20 kN / 4500 lbf |
| Static Load Rating | 14.4 kN / 3250 lbf |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Item Weight | 0.93 lbs |
| Cage Material | Phenolic |
| Limiting Speed | 13800 rpm |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 25 degrees |
| Mounting Arrangement | Back-to-back, face-to-face or tandem |
| Design Units | Metric |
| Bearing Material | Through-hardened bearing steel |
| Part Number | 3MM9312WI-CR-DUL |
| Cross Reference 1 | 71912 CD/P4A (ISO base, 25 deg light preload pair) |
|---|---|
| Cross Reference 2 | NSK 7912A5TRDULP4Y |
| Cross Reference 3 | SKF 71912 ACD/P4ADGA |
| Cross Reference 4 | Timken 3MM9312WICRDUL |
A Fafnir 3MM9312WI-CR-DUL super-precision angular contact ball bearing in the 60 x 85 x 13 mm envelope, corresponding to ISO designation 71912. Single-row rings ground as a universally matched duplex pair.
3MM — 25° contact angle in the Fafnir scheme.
MM prefix — Fafnir super-precision class, equivalent to ABEC 7/9 (P4S).
9312 — base size code for the 60 x 85 x 13 mm section.
CR — phenolic (laminated fabric) ball cage.
DUL — duplex, universally ground, light preload.
A 25° contact angle carries more thrust and less speed than a 15° bearing of the same envelope, which suits ball-screw ends and loaded spindle positions. Light preload gives the highest limiting speed of the three standard preload grades and the lowest heat generation. A phenolic cage runs quiet, holds oil in its structure and is the standard choice for high-speed super-precision service; its useful ceiling is around 120 °C.
Bore: 60 mm (2.362 in)
Outside diameter: 85 mm (3.346 in)
Width: 13 mm (0.512 in) per bearing
Rows: 1 per bearing
Contact angle: 25°
Precision class: ABEC 7/9 (P4S)
Preload: light
Cage material: phenolic
Closure: open, both faces
Sale unit is one universally ground duplex pair, 2 pieces. Universal grinding means either bearing of the pair can be set back-to-back, face-to-face or in tandem, and the light preload is established by the ground offset when the rings are clamped.
Both rings clamp fully against square, ground shoulders; the preload is only realised once the inner rings and outer rings are each drawn solidly together. Mounting is by light interference on the shaft and a close fit in the housing, with the bearings handled clean and oiled before clamping.
The direct ISO equivalent is 71912 at 25° in a matched light-preload set, for example NSK 7912A5TRDULP4Y or SKF 71912 ACD/P4ADGA. The 15° forms in the same envelope — 71912 C, Fafnir 2MM9312WI — are related sizes, not interchanges, because the contact angle changes the thrust and speed capability.
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