10pcs MR74ZZ Miniature Ball Bearings 4x7x2.5mm Stainless Steel

JARBLUE MR74ZZ Miniature Shielded Ball Bearings — 10-Piece Set

Upgrade your precision machinery, RC models, robotics, or small mechanical assemblies with this 10-piece set of MR74ZZ miniature ball bearings. Engineered from high-grade Gcr15 bearing steel and featuring double-side metal shields (ZZ), these compact 4×7×2.5mm bearings deliver smooth, low-friction rotation in tight spaces where performance matters most.

Key Specifications

Why Choose MR74ZZ Bearings?

• Ultra-compact design — At just 4×7×2.5mm, these bearings fit into the tightest mechanical spaces without sacrificing performance.
• Double-side metal shields (ZZ) — Protects internal components from dust, debris, and light moisture ingress, extending service life.
• High-grade Gcr15 bearing steel — Provides excellent hardness, wear resistance, and dimensional stability under continuous operation.
• CE certified quality — Manufactured to P0.Z2 / ABCE-1.Z2 precision standards for reliable, consistent performance.
• Versatile compatibility — Cross-compatible with DDL-740ZZ, S674ZZ, B674ZZ, and WA674ZZ designations across multiple international standards.
• Pack of 10 — Great value for repairs, builds, or keeping spares on hand.

Common Applications

• RC cars, drones, and model aircraft
• 3D printers and CNC machines
• Robotics and servo mechanisms
• Small electric motors and spindles
• Medical and dental equipment
• Precision instruments and electronics

Made in Zhejiang, China (Mainland).

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Frequently Asked Questions

Q: What is the difference between MR74ZZ and MR74RS bearings?

A: The MR74ZZ features two-side metal shields (ZZ suffix), which protect the bearing from dust and debris while allowing for slightly lower friction at higher speeds. The MR74RS uses rubber seals (RS suffix) for a tighter seal against contaminants, making it better suited for environments with more exposure to dust or moisture. Both share the same 4×7×2.5mm dimensions and are interchangeable in most applications.

Q: Are these MR74ZZ bearings compatible with DDL-740ZZ, S674ZZ, B674ZZ, or WA674ZZ replacements?

A: Yes. The MR74ZZ is cross-referenced with DDL-740ZZ, S674ZZ, B674ZZ, and WA674ZZ — these are all equivalent designations used by different manufacturers and standards bodies for the same 4×7×2.5mm miniature ball bearing. You can use this bearing as a direct drop-in replacement for any of those model numbers.

Q: Can these bearings be used in 3D printers or RC models?

A: Absolutely. The MR74ZZ is one of the most popular miniature bearings for 3D printers, RC cars, drones, and robotics due to its compact size and smooth rotation. The metal shields keep lubricant in and contaminants out, making them ideal for fast-spinning, precision applications.

Q: How many bearings are included in one order?

A: Each pack includes 10 pieces of MR74ZZ miniature ball bearings, giving you excellent value whether you're doing a repair, a full build, or stocking up on spares.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.