1 Complete Model & Code Explanation

Model: 7010 ACD/P4ADGA

Code Definition

7010: Light series precision angular contact ball bearing basic dimension

ACD: 25° contact angle

P4A: Precision tolerance grade P4A

DGA: Duplex bearing sorted by load and face height, GA grade for on-site duplex assembly

Key Dimensions

Bore d: 50 mm

Outer diameter D: 80 mm

Width B: 16 mm

Contact angle: 25°

Structure: Single row open bearing

Rolling element: High-carbon chromium bearing steel ball

Ring material: High-carbon chromium bearing steel

Supply form: Loose single unit, supports on-site DB/DF/DT duplex arrangement

Preload classification: DGA dual-sorted specification (face height & load), adjustable via spacer shims

Pre-filled lubricant: None

Coating: None

Note: Contact SKF for official load ratings and limiting speed data.

Full Product Attributes

Contact form: two-point contact

Number of rows: 1 (single bearing)

Duplex capable: Yes, back-to-back (<>), face-to-face (><), tandem (>>)

Factory pre-assembled duplex set: Not supplied (loose single unit)

Precision class: P4A precision grade

Material: Full high-carbon chromium bearing steel (all-steel bearing)

Seal: Open type, no seal

Note: The 25° contact angle delivers outstanding axial load capacity for conditions with cutting axial thrust and radial loads. All-steel construction possesses good toughness and slight impact resistance with favorable cost performance. DGA grade undergoes dual sorting of end-face height and load, ensuring even load distribution and lower spindle vibration after duplex mounting. Supplied as loose singles for flexible duplex spindle layout design. Open structure eliminates seal drag and fits oil-air lubrication system. Independent lubrication system and external dust protection are mandatory. Use same-batch DGA grade bearings for duplex assembly to minimize assembly deviation.

2 Structure & Operating Characteristics

Japan NMT 7010 ACD/P4ADGA is a size 7010 high-speed precision all-steel angular contact ball bearing. Inner rings, outer rings and steel balls are ultra-precision ground from premium bearing steel. The 25° contact angle reinforces axial load capacity to steadily withstand combined radial and axial loads. Adopting high-standard DGA sorting process, single bearings feature high consistency of end-face height, providing superior coaxiality and lower vibration after duplex combination.

Supplied as non-pre-matched single bearings, multiple duplex layouts including DB, DF and tandem are optional. Technicians achieve precise preload setting with spacers and shims. The low-friction open bearing is widely equipped on machining center spindles, high-speed engraving & milling spindles, precision grinding spindles and other machinery.

3 Core Performance Advantages

1. 25° contact angle: Excellent axial load capacity to sustain combined radial and axial cutting loads.

2. All-steel construction: Good toughness, slight impact resistance, high cost performance and stable spare parts supply.

3. P4A precision grade: Strict rotary runout control to maintain long-term machining accuracy.

4. DGA dual-sorted duplex-capable single bearing: Graded by face height and load, uniform load distribution and reduced vibration after duplex assembly.

5. Open unsealed structure: Free of seal resistance loss, fully compatible with oil-air high-speed lubrication.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A precision bearings must be assembled in dust-free clean environment. Remove all burrs and metal debris from shaft and housing mating surfaces. Controlled thermal mounting is recommended. Never strike bearing rings or steel balls directly. Select same-batch DGA grade bearings for duplex assembly to reduce height difference and uneven load.

5.2 Matching & Preload Instructions

No factory duplex assembly. All duplex layouts and target preload are set on-site with spacers and shims. DGA sorting grade serves only as selection reference. Measure spindle axial rigidity and vibration after assembly to verify actual preload state. Avoid excessive preload which causes overheating and premature bearing fatigue failure.

5.3 Lubrication Matching Solutions

No pre-filled lubricant. Special high-speed spindle grease suits intermittent high-speed operation. Oil-air lubrication is preferred for continuous long-running high-speed applications to remove friction heat efficiently. Do not mix lubricants of different brands or models. Inspect lubrication pipelines regularly.

5.4 Speed Parameter Note

Obtain official load ratings and limiting speed data from SKF. Its maximum DN value is lower than hybrid ceramic bearings of the same specification. Maintain adequate safety margin based on load and cooling conditions; reduce operating speed under heavy load.

6 Daily Maintenance & Fault Troubleshooting

Perform multi-stage low-speed running-in after assembly. Gradually increase rotating speed to rated value only after temperature rise and vibration stabilize. Open bearings have no built-in dust shield; labyrinth or air curtain dust-proof device must be installed on equipment.

Sustain continuous and stable lubrication; dry friction operation is prohibited. In case of abnormal temperature rise, abnormal noise or sharp vibration growth, check lubrication supply, mounting coaxiality, preload shim thickness, operating load and integrity of dust protection sequentially.