NMT Ltd.
Corporate Communications Department
NMT 7007 ACDGB/HCP4A Super Precision Hybrid Ceramic Angular Contact Ball Bearing – Japan NMT High-Speed Spindle Solution
Product Overview
The NMT 7007 ACDGB/HCP4A is a super-precision single-row angular contact ball bearing engineered for high-speed, high-rigidity spindle applications. With a 35 mm bore, 62 mm outer diameter, and 14 mm width, this bearing features a 25° contact angle design that efficiently accommodates combined radial and axial loads simultaneously.
Manufactured to the P4A super-precision tolerance class (dimensional accuracy to P4 grade, running accuracy exceeding P4 grade) and equipped with hybrid ceramic rolling elements (silicon nitride Si₃N₄) and a phenolic cage, this bearing achieves a limiting speed of up to 56,000 rpm. With a basic dynamic load rating of 14.8 kN and static load rating of 9 kN, it delivers exceptional load capacity and rigidity within a compact envelope.
Model Code Decoding – Understanding NMT 7007 ACDGB/HCP4A
Code Meaning
7007 Basic series designation, 35 mm bore, medium-duty angular contact bearing
AC Angular contact design with 25° contact angle
D High-capacity D-type design with increased ball complement
G Single bearing
B Universal matchable – supports back-to-back (<>), face-to-face (><), or tandem (>>) arrangements
HC Hybrid ceramic – rolling elements made of bearing-grade silicon nitride (Si₃N₄)
P4A Super-precision tolerance class – dimensional accuracy P4, running accuracy exceeding P4
Core Performance Advantages
1. Super-Precision Running Accuracy
The P4A tolerance class ensures minimal runout and vibration levels, meeting the stringent rotational accuracy requirements of high-precision machine tool spindles and precision instruments.
2. Hybrid Ceramic Technology – Higher Speeds, Lower Temperature Rise
Silicon nitride ceramic balls weigh only 60% of equivalent steel balls, significantly reducing centrifugal forces and frictional heat at high speeds, enabling stable temperature performance even at the 56,000 rpm limiting speed.
3. Universal Matchable Design – Flexible Arrangements
The GB suffix indicates universal matchable特性, allowing back-to-back, face-to-face, or tandem configurations without selective shimming, delivering effective load sharing within a predetermined preload range.
4. High-Capacity D-Type Design
Optimized ball complement and raceway curvature deliver higher radial and axial load capacity within a compact footprint.
5. Lightweight and Sustainable
Each bearing weighs only 0.15 kg with a carbon footprint of just 0.56 kg CO₂e, balancing high performance with environmental responsibility.
Typical Applications
The NMT 7007 ACDGB/HCP4A is ideal for demanding industrial applications including:
High-Speed Machine Tool Spindles – precision turning, milling, and grinding spindles
CNC Machining Centers – high-speed, high-rigidity spindle systems
Precision Instruments – measuring equipment, optical instrument rotary mechanisms
Industrial Robots – robot joints and high-precision actuators
High-Speed Motors – high-speed permanent magnet motors and spindle motors
NMT Quality Commitment
Japan NMT (Enmutī) enjoys an outstanding reputation in the precision bearing industry, with its angular contact ball bearing product line widely applied in high-precision machine tools, precision instruments, and high-speed motors. Through micro-profiling of rolling contact surfaces and precision raceway grinding, NMT ensures that contact angle deviations are minimized to an extremely narrow range, reducing friction variations during startup and operation to the lowest possible level.
Choose NMT 7007 ACDGB/HCP4A for:
✅ Japanese precision manufacturing craftsmanship
✅ Super-precision P4A tolerance class
✅ Hybrid ceramic high-speed performance
✅ Universal matchable flexible arrangements
✅ Full lifecycle reliability