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Super-precision angular contact ball bearing, 8 x 22 x 7 mm, 25° contact angle, high-capacity design, ABEC 7. 1 Pc.
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| MFR / Brand | SKF |
|---|---|
| MPN | 708ACD/P4 |
| Model | 708 ACD P4 708A |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 8 mm |
| OD | 22 mm |
| Width | 7 mm |
| Material | Bearing Steel |
|---|---|
| Series | 700 |
| Condition | New |
| Base Number | 708 |
| Industry Terms | Spindle bearing, super precision bearing, angular contact ball bearing, high capacity design, miniature precision bearing |
| Common Misspellings | SKF 708ACDP4, 708 ADC/P4, SKF 708 AC D P4, 708ACD-P4 |
| Application Types | Small high-speed spindles, precision instrument shafts, dental and grinding spindles |
| Bore Shaft Size | 8 mm (0.3150 in) |
| Mpn Variants | 708ACD/P4, 708 ACD P4, 708-ACD/P4, 708ACDP4, 708 ACD/P4A |
| Arrangement Configuration | Single standalone bearing |
| Precision Class | P4 (ABEC 7) |
| Additional Attributes | Ratings published for the 708 ACD/P4A variant of the same ACD internal design |
| Min Temp | -30°C |
| Cage Type | Phenolic |
| Dynamic Load Rating | 3.19 kN |
| Static Load Rating | 1.34 kN |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Max Temp | 120°C |
| Item Weight | 0.012 kg |
| Cage Material | Phenolic Resin |
| Limiting Speed | 80000 |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 25° |
| Design Units | Metric |
| Bearing Material | Carbon chromium bearing steel |
| Internal Clearance | CN |
| Part Number | 708 ACD/P4 |
| Cross Reference 1 | 708 ACD/P4A (SKF published variant of the same design) |
|---|---|
| Cross Reference 2 | NSK 708A5 |
| Cross Reference 3 | FAG B708-C-T-P4S (708 envelope precision) |
An SKF 708 ACD/P4 single-row super-precision angular contact ball bearing measuring 8 x 22 x 7 mm. It is an extra-light 70-series bearing with a 25° contact angle, built to the high-capacity ACD internal design and held to P4 (ABEC 7) accuracy.
70 — extra-light dimension series
8 — 8 mm bore
AC — 25° contact angle in the SKF scheme
D — high-capacity internal design
P4 — dimensional and running accuracy to ABEC 7
A 25° contact angle carries more thrust and less speed than the 15° C variant in the same envelope, which suits spindles where axial stiffness governs. The ACD high-capacity design raises the ball complement and raceway shoulder height relative to the older AC arrangement, lifting the dynamic rating within the same 8 x 22 x 7 mm envelope. P4 accuracy controls bore, outside diameter and raceway runout to super-precision limits, and at these speeds that runout is what keeps a small spindle in balance.
Bore: 8 mm (0.3150 in)
Outside diameter: 22 mm (0.8661 in)
Width: 7 mm (0.2756 in)
Contact angle: 25°
Precision class: P4 (ABEC 7)
Basic dynamic load rating C: 3.19 kN
Basic static load rating C0: 1.34 kN
Fatigue load limit Cu: 0.056 kN
Reference speed: 120,000 rpm
Limiting speed: 80,000 rpm
Mass: 0.012 kg
Rows: single
Closure: open
Internal clearance: standard
1 Pc, a single standalone bearing.
A single angular contact ball bearing takes thrust in one direction only and is located axially against a second bearing or a fixed shoulder. The seat and housing bore are ground to tolerances matched to the P4 class, and mounting is done by even axial pressure on the ring being fitted so no load passes through the ball complement.
Same-spec equivalents are 25°, P4-class, high-capacity 708-envelope bearings from other super-precision makers, such as FAG B7008… in the corresponding bore, NSK 708A5 and NTN 7000-series 8 mm bore precision variants at a 25° angle. The SKF 708 CD/P4A carries a 15° angle in the identical envelope and is a related size, not an interchange. Suffix variants that differ in preload or matching — /P4ADGA, /P4ADGB, /P4ADGC, /P4AH — are also related sizes.
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