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Carbon Brushes

J164 Slip Ring Carbon Brush

Part No. J164

J164 high-copper metal-graphite carbon brush for slip rings and commutators on low-voltage, high-current machines — YZR crane-motor slip rings, welding-machine ground brushes, exciters, starters and collector rings. Rated 20 A/cm², max speed 20 m/s, resistivity 0.045–0.135 µΩ·m; stocked in 25×32×60 mm and other standard sizes.

Dimensions	- Stock sizes (per supplier listings): 25×32×60 mm; 12.5×32×50 mm; 20×40×60 mm; 16×45×50 mm; 32×32×6
Current Density	20 A/cm²
Speed	Maximum peripheral speed 20 m/s
Grade	J164

Compatible Models

YZR-series wound-rotor crane motors (YZR112 YZR132 YZR160 YZR200 YZR250 YZR280 YZR315 — slip-ring brush positions) Seam welder / roll seam welding machine ground brushes (e.g.

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Technical Specifications

Specification	Value
Grade	J164 (Chinese standard JB/T 4003)
Material	Metal graphite — high copper (copper-carbon, ≈85% Cu)
Resistivity	0.045–0.135 µΩ·m
Current Density	20 A/cm² (rated; up to 25 A/cm² per supplier datasheets)
Max Surface Speed	20 m/s
Contact Drop	≤0.7 V (pair, per standard/CarbonPro chart)
Friction Coefficient	0.18–0.42
Density	4.99–6.05 g/cm³
Hardness	Rockwell (supplier datasheet; IUGIS 62 HR10/392)
Stock Sizes	25×32×60; 12.5×32×50; 20×40×60; 16×45×50; 32×32×60; 32×42×60/65/75; 8×20×32; 10×25×40; 5.5×7×18 (spring type) mm
Voltage	Not rated (N/A); low-voltage machines (≤60 V class typical)
Lead Type	Flexible copper braid with terminal; multi-lead high-current; spring-contact type
Spring	Not included (shunt type); spring-contact variants available
Application	Slip rings & commutators — YZR crane motors, welders, exciters, starters, collector rings, grounding brushes

Compatible Models

This J164 Slip Ring Carbon Brush is designed as a direct replacement for the following machine models and series:

YZR-series wound-rotor crane motors (YZR112 YZR132 YZR160 YZR200 YZR250 YZR280 YZR315 — slip-ring brush positions) Seam welder / roll seam welding machine ground brushes (e.g. 32×42×60) Silicon-rectifier generator brushes (spring type e.g. 5.5×7×18) AC exciter generators / gas-turbine exciter positions (e.g. 32×32×60) Automotive starter motor brushes High-current collector rings & grounding/earthing devices (e.g. 300 A welding ground brush 25×32×60) Related grades for comparison: J201 (low copper) J204 (medium/half copper) D172 J102 (metal graphite)

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Description

This J164 slip-ring carbon brush is a high-copper metal-graphite brush to the Chinese standard grade J164 (JB/T 4003). The high copper content gives outstanding conductivity — resistivity of only 0.045–0.135 µΩ·m — and a rated current density of 20 A/cm², making it a proven choice for low-voltage, high-current-density service on slip rings and commutators. Typical installations include the slip rings of YZR-series wound-rotor crane motors, welding-machine ground brush positions, silicon-rectifier generators, AC exciter commutators, automotive starters and general high-current collector rings. The brush is supplied to your required size and lead configuration — including multi-lead high-current and spring-contact variants — ready for installation.

Features & benefits:

High-copper metal-graphite grade (J164) — very low resistivity (0.045–0.135 µΩ·m), rated 20 A/cm² for high-current duty.
Slip-ring / commutator proven — YZR crane-motor slip rings, welding-machine ground brushes, exciters, starters, collector rings.
Multiple stock sizes — 25×32×60, 12.5×32×50, 20×40×60, 32×32×60, 32×42×60 and more; custom per drawing.
Flexible lead options — single or multi-lead copper braid with terminals; spring-contact type available.
Standard-grade traceability — manufactured to Chinese standard JB/T 4003.
Quality-inspected before dispatch: dimensional check, lead crimp integrity, and surface condition per batch.