The F624ZZ Flange Deep Groove Ball Bearing (4x13x5mm) is a miniature, high-precision radial ball bearing engineered for low-friction rotary motion, high radial load capacity, and precise axial positioning in compact mechanical assemblies. Featuring an integrated solid outer-ring flange and dual steel dust shields (ZZ), this bearing provides a positive locating shoulder that prevents axial movement inside mounting bores while safeguarding internal raceways from dust and debris, making it an essential component for 3D printer gantry idlers, belt tensioners, extruder mechanisms, and robotics projects.

Specification

• Bearing Model: F624ZZ (Flanged Miniature Deep Groove Series)
• Bore Diameter (Inner Diameter / ID): 4.0mm
• Outer Diameter (OD): 13.0mm
• Bearing Width / Thickness (W): 5.0mm
• Flange Diameter (D1): Approx. 15.0mm
• Flange Thickness (C1): Approx. 1.0mm - 1.2mm
• Material: High-Grade GCr15 High-Carbon Chromium Bearing Steel (Hardened & Precision Ground)
• Closure / Shielding: Dual-Sided Metal Dust Shields (ZZ Designation)
• Internal Clearance: Standard Precision Radial Clearance (C0 / ABEC-1 to ABEC-3 standard)
• Lubrication: Pre-lubricated with high-stability micro-bearing grease
• Dynamic Load Rating (Cr): Approx. 1300 N
• Static Load Rating (Cor): Approx. 490 N
• Speed Limit: Up to 32,000 RPM (Grease Lubrication)
• Shaft / Fastener Compatibility: Fits standard 4mm precision dowel pins, linear guide shafts, and M4 metric shoulder screws.

Features

• Integrated Flanged Outer Ring: The built-in precision flange acts as a positive mechanical locating stop against plates or housing bores, eliminating axial slippage and the need for external retaining circlips.
• Heavier 624-Series Load Rating: Compared to the slimmer 604 series, the 13mm OD and 5mm width provide larger rolling balls and deeper raceways, offering higher dynamic load capacity and greater resistance to radial belt tension.
• Dual Metal Dust Shields (ZZ): Pressed steel shields on both sides retain internal factory grease while preventing workshop dust, filament debris, and foreign particles from contaminating the ball tracks.
• Smooth, Low-Friction Operation: Precision-ground raceways and micro-polished steel balls deliver ultra-low rotational torque, minimal vibration, and quiet operation across varying speeds.
• Ideal for Belt Idler Stacks: Frequently used in back-to-back pairs with flanges facing outward to create self-guiding, low-friction idler pulleys for 6mm and 9mm GT2 timing belts.

Common Applications

• 3D Printer Timing Belt Idlers & Tensioners: Used in Voron, CoreXY, Prusa, Creality, and custom DIY 3D printer gantries as primary belt idlers and tensioning rollers.
• Extruder Filament Drive Assemblies: Serving as the low-friction idler bearing pressing filament against dual-drive extruder gears.
• Desktop CNC Routers & Laser Engravers: Providing smooth roller guidance and belt idler support for X/Y gantry drive systems.
• Robotics & Automated Actuators: Guiding miniature timing belts, drive cables, sensor trigger wheels, and compact pivot points.

Professional Installation and Maintenance Tips

• Apply Pressing Force Correctly: When mounting onto a 4mm shaft, apply force strictly to the inner ring. When seating into a housing bore, press only on the outer ring or flange face. Never press against the shields or rolling balls to avoid brinelling the raceways.
• Use Shims When Stacking Bearings: If assembling two F624ZZ bearings face-to-face as a belt pulley, insert a thin 4mm precision washer or shim between the inner rings so the outer bodies can spin freely without binding against the clamping bolt.
• Do Not Degrease Factory Shielded Bearings: The internal high-performance grease is pre-calibrated for long operating life. Avoid soaking shielded (ZZ) bearings in harsh solvents unless immediately re-lubricating with appropriate bearing oil/grease.
• Verify Shaft Tolerances: Mount on precision-ground 4mm shafts (h6 or g6 tolerance) and avoid forcing over rough, threaded screw shafts to prevent bore distortion and internal ball binding.