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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
Availability:
2 in stock
Tapered roller bearing matched pair, 60 x 85 x 17 mm, ABEC 5 / P5 precision. NSK HR32912J DB set, 60,000 N dynamic rating per bearing, pressed steel cage.
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| MFR / Brand | NSK |
|---|---|
| MPN | HR32912JDBP5 |
| Model | HR 32912 J DB P5 + KL10 CP45 |
| Bearing Type | Tapered Roller Bearing Cone |
| ID | 60 mm |
| OD | 85 mm |
| Base Number | 32912 |
|---|---|
| Industry Terms | tapered roller bearing; cone and cup; matched pair; duplex set; back-to-back set; precision taper bearing; DB set |
| Common Misspellings | HR 32912 J DB P5; HR32912DBP5; HR32912JD BP5; HR3291 2J; 32912JDB P5 |
| Application Types | machine tool spindles; rotary tables; precision gearboxes; indexing heads; worm drives |
| Total Width | 17 mm |
| Overall Width | 17 mm |
| Mpn Variants | HR32912JDBP5; HR-32912-J-DB-P5; HR32912J DB P5; HR32912JDB; 32912J; 32912; KL10CP45 |
| Precision Class | ABEC 5 / P5 |
| Additional Attributes | Jet-lubrication limiting speed 7,100 rpm. Cone width B 17 mm. Cup width C 14 mm. Effective load centre a 15.5 mm. Axial load factors e 0.33, Y1 1.8, Y0 1. da min 69 mm; db max 65 mm; Da 78-79 mm; Db min 81 mm; ra max 1 mm; Sa 4 mm; Sb 3 mm. ISO dimension series 2BC. |
| Cage Type | Pressed |
| Dynamic Load Rating | 60,000 N |
| Static Load Rating | 84,500 N |
| Series | 329 |
| Rolling Elements | Tapered Roller |
| Item Weight | 0.306 kg (0.675 lb) per bearing |
| Cage Material | Pressed steel |
| Number Of Rows | 1 per bearing |
| Bore Type | Cylindrical |
| Limiting Speed | 3,800 rpm grease; 5,300 rpm oil |
| Lubricant | grease or oil |
| Harmonization Code | 8482.20.00 |
| Mounting Arrangement | Back-to-back (DB) |
| Cross Reference 1 | Timken 32912 |
|---|---|
| Cross Reference 2 | SKF 32912/Q |
| Cross Reference 3 | FAG 32912-A |
| Cross Reference 4 | Koyo 32912JR |
| Cross Reference 5 | NTN 4T-32912X |
| Cross Reference 6 | NACHI 32912 |
NSK HR32912J single-row tapered roller bearing cone and cup, supplied as a back-to-back matched pair. Bore Diameter: 60 mm. Outside Diameter: 85 mm. Overall Width: 17 mm. Cone width B: 17 mm. Cup width C: 14 mm. Rolling Elements: Tapered Roller. Precision Class: ABEC 5 / P5.
HR — NSK high-capacity uprate of the base 32912 design, within the same ISO boundary dimensions.
32912 — ISO metric tapered roller size, 60 x 85 x 17 mm, dimension series 2BC.
J — pressed steel cage.
DB — back-to-back matched pair. Two single-row bearings ground as a set and mounted with their load lines diverging.
P5 — ISO class 5 precision, equivalent to ABEC 5.
Dynamic Load Rating: 60,000 N (13,488 lbf) per bearing. Static Load Rating: 84,500 N (18,997 lbf) per bearing. Limiting Speed: 3,800 rpm grease; 5,300 rpm oil. Jet lubrication raises the limit to 7,100 rpm. Item Weight: 0.306 kg (0.675 lb) per bearing. Cage Material: Pressed steel. Closure Type: Open. Lubricant: grease or oil. The back-to-back pair carries radial load and axial load in both directions, and the wide effective spread between the two load lines gives high moment stiffness.
Effective load centre a: 15.5 mm. Shaft abutment diameter da min: 69 mm. Cone back face abutment db max: 65 mm. Housing abutment diameter Da: 78–79 mm. Housing abutment Db min: 81 mm. Maximum abutment fillet radius ra: 1 mm. Cone back face clearance Sa: 4 mm. Cup back face clearance Sb: 3 mm. Axial load factors e: 0.33, Y1: 1.8, Y0: 1.
Unit Quantity: 2 Pcs. Mounting Arrangement: Back-to-back (DB). Number Of Rows: 1 per bearing. Load ratings and mass are stated per bearing.
The 32912 ISO envelope is shared by Timken 32912, SKF 32912/Q, FAG 32912-A, Koyo 32912JR, NTN 4T-32912X and NACHI 32912. The HR execution is NSK’s high-capacity version on that envelope.
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