Magnetic Performance Stability
The Ø5×18mm Alnico rod magnet uses an Alnico 5 alloy containing aluminum, nickel, cobalt, iron, and copper to generate a stable magnetic field inside guitar pickup assemblies. During pickup production, each rod is magnetized along the axial direction to control gauss distribution across the pole pieces. Stable magnetic flux helps reduce output variation between strings and limits frequency imbalance caused by inconsistent pole magnetization. This structure is commonly integrated into single coil and humbucker pickups where pickup winding tension, pole spacing, and magnetic strength must remain consistent across batch production.
Precision Dimension Control
Diameter and Length Tolerance Control
The rod diameter influences insertion force during pickup assembly. Excessive diameter deviation may crack flatwork materials or loosen pole positioning after wax potting. Length tolerance also affects exposed pole height and pickup balance after final installation.
01
Surface Grinding and Chamfer Processing
Centerless grinding is used to process the rod surface and maintain cylindrical consistency across the full length of the magnet. Chamfered edges reduce chipping during insertion into pickup bobbins and help prevent cracking in vulcanized fiberboard during pressing operations.
02
Pole Alignment During Coil Winding
Parallel alignment between adjacent pole rods affects magnetic field distribution inside the pickup coil. Controlled straightness and dimensional consistency help maintain even spacing during coil winding, reducing assembly deviation in multi-pole pickup configurations.
03
Compatibility with Standard Pickup Structures
The Ø5×18mm size is commonly used in Strat-style single coil pickups, humbucker slug structures, and custom hand-wound pickup systems. The rod dimensions allow direct installation into standard pickup tooling and bobbin hole patterns used in OEM guitar pickup production.
04
FAQ
What is an Alnico Rod Magnet used for in guitar pickups?
Alnico rod magnets are installed inside guitar pickup bobbins to generate the magnetic field around steel strings. String vibration disturbs the magnetic field and induces signal output through the copper pickup coil. Ø5×18mm rod magnets are commonly used in Strat-style single coil pickups, humbuckers, and bass pickups.
Can you manufacture custom sizes for guitar pickup magnets?
Yes. Custom diameter, length, chamfer angle, magnetization direction, and gauss level can be produced according to pickup structure drawings or OEM specifications. Custom rod magnets can also be supplied in magnetized or unmagnetized condition.
What tolerance can you control on the rod diameter?
Diameter tolerance affects insertion fit inside pickup bobbins and flatwork assemblies. Ground rod magnets are processed to controlled tolerances to support stable pole spacing and reduce assembly deviation during pickup production.
Are the rod magnets axially magnetized?
Yes. Ø5×18mm pickup rod magnets are typically magnetized through the length direction (axial magnetization) to transfer magnetic flux from the pole tip toward the pickup coil winding structure.
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