1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7007 ACDGC/P4A

Model Code Explanation

7007: Standard boundary dimension of 70 series precision angular contact ball bearing;

ACD: 25° contact angle, high-load D internal raceway profile;

GC: Single bearing, measured preload Class C;

P4A: P4A ultra-precision tolerance class, bearing steel material.

Standard Dimension Parameters

Bore d: 35 mm

Outer diameter D: 62 mm

Width B: 14 mm

Contact angle: 25 °

Performance Data

Basic dynamic load rating Cr: 14.8 kN

Basic static load rating C0r: 9 kN

Speed note: Contact SKF for data on achievable rotational speed.

Full Product Attributes

Contact form: standard two-point contact

Number of bearings: 1 (independent single bearing)

Ring structure: integrated inner ring and outer ring

Internal design: high-load D optimized design

Compatible re-matching: Available, can be arranged as back-to-back (<>), face-to-face (><) or tandem (>>)

Duplex layout: None (single unit for field assembly)

Quantity of bearings in kit: 1

Preload specification: Measured load, Class C

Tolerance class: P4A precision grade

Material: bearing steel

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication configured on site

Indicative carbon footprint for new product: 0.56 kg CO₂e

Net weight: 0.15 kg

eClass code: 23-05-08-04

UNSPSC code: 31171531

Note: The 25° contact angle delivers outstanding axial load capacity. D-type raceway optimizes rolling element contact stress distribution. Bearing steel provides balanced hardness and wear resistance. Supplied as loose single bearing without factory matched set; users can configure multiple layouts with custom spacers. Preload follows measured load Class C for convenient on-site adjustment. Open construction requires external dust sealing system.

2 Structure & Operating Characteristics

Japan NMT 7007 ACDGC/P4A is a 7007 size 25° high-load D-type precision single angular contact bearing constructed with integrated heat-treated bearing steel rings and super-finished raceways. Optimized D-shaped raceway equalizes contact stress, and the 25° contact angle withstands combined radial and bidirectional axial loads.

Open non-sealed design removes seal friction loss, compatible with oil-air lubrication and high-speed grease lubrication systems. No lubricant pre-filled; lubricant shall be added during assembly.

Supplied as independent single bearing without factory fixed arrangement. Equipment manufacturers can combine multiple bearings and precision spacers to build back-to-back, face-to-face, tandem and multi-set composite support structures. Uniform Class C measured load tolerance facilitates dimensional calculation and preload tuning, suitable for precision machinery with self-designed preload mechanism.

3 Core Performance Advantages

1. 25° contact angle + high-load D raceway: Strong axial capacity, evenly distributed contact stress.

2. P4A ultra-precision grade: Strict rotary runout control for stable long-term accuracy.

3. Bearing steel material: High hardness, excellent wear resistance and reliable load capacity.

4. Freely combinable single unit: Flexible layout for customized spindle solutions.

5. Class C measured load standard: Unified benchmark for accurate on-site preload adjustment.

6. Open seal-free construction, low friction, compatible with various high-speed lubrication systems.

4 Typical Application Scenarios

4.1 CNC engraving & milling machines, compact machining center spindles: OEMs developing self-designed bearing supports and adjustable preload structures.

4.2 Precision grinders, high-speed automation rotary modules: Applications requiring both load capacity and rotational speed with on-site preload tuning.

4.3 Precision testing instruments, general machinery high-speed support units: Medium-load conditions demanding high rigidity and long-term operational stability.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision bearings shall be assembled in dust-free clean workshops. Remove all burrs and metal debris on shaft and housing mating surfaces. Controlled thermal mounting is recommended. Never strike bearing rings or raceways directly. When multiple bearings are paired, select same-batch products to minimize assembly error.

5.2 Matching & Preload Instructions

This loose single bearing has no factory preset pairing; back-to-back, face-to-face or tandem arrangements can be freely selected. Preload follows measured load Class C. Target preload is achieved by adjusting spacer thickness via dimensional chain calculation. Modify spacer dimensions if preload level needs adjustment.

5.3 Lubrication Matching Solutions

No pre-filled lubricant. Oil-air lubrication is preferred for continuous long-duration high-speed running; dedicated high-speed grease is applicable for intermittent operation. Do not mix lubricants of different brands or types. Regularly inspect lubrication pipelines.

5.4 Speed Parameter Note

Obtain limiting speed reference data from SKF. Maintain adequate safety margin according to actual load; moderately reduce operating speed under increased load to control bearing temperature.

6 Daily Maintenance & Fault Troubleshooting

Implement multi-stage low-speed progressive running-in after assembly. Raise speed to rated value only after temperature rise and vibration stabilize. Open bearings do not have dustproof capability; main machine must be fitted with labyrinth or contact dust seals.

Ensure continuous and stable lubricant supply to avoid rolling surface damage caused by dry friction. In case of abnormal temperature rise, increased vibration or operating noise, sequentially check lubrication supply, mounting coaxiality, spacer precision, preload and actual operating load.