D374B Railway Carbon Brush for GE Motors D374N

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Carbon Brushes

D374B Railway Carbon Brush for GE Motors D374N

Part No. D374B

D374B / D374N electrographite railway carbon brush for GE traction motors, locomotive main generators, turbine-generator exciter motors, rolling-mill and Z4 DC motors. D374B: 2 × (11 × 36 × 44) mm split brush; D374N: ρ58 µΩ·m, Rockwell 83, rated 12 A/cm², 60 m/s; supplied to size with copper-braid lead.

Material	Electrographite
Dimensions	- D374B: 2 × (11 × 36 × 44) mm (double/split brush) - D374N: 12.5 × 25 × 40 mm; 16 × 25 × 40 mm; 20
Application	D374B / D374N electrographite brush for: - Railway traction motors (GE) — high-speed traction DC motors with difficult commutation - Locomotive main generators and turbine-generator exciter motors - Rolling mill motors and heavy DC motors
Current Density	- D374 family: 10–12 A/cm² (per CarbonPro industrial brush chart) - D374N: rated
Speed	- D374 family: 50 m/s permissible peripheral speed (per CarbonPro chart) - D374N
Hardness	- D374: Rockwell 70 (10 mm steel ball), tolerance +67% / −50% - D374N: Rockwell
Grade	D374B / D374N

Compatible Models

GE 752 traction motor (railway locomotive) — D374-family cross verify per brush drawing GE 5CD362 / 5CD363 / 5CD372 / 5CD373 motors — D374-family cross verify GE 36A171014AAP11 brush position — D374F aftermarket cross-reference (same D374 family) Siemens traction motors — D374 / D374N per Siemens service data Z4 series DC motors (12.5 × 25 × 40 / 16 × 25 × 40 / 20 × 25 × 40 mm) — verify per motor Locomotive main generators and turbine-generator exciter motors — verify per machine

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Technical Specifications

Specification	Value
Grade	D374B / D374N (D374 electrographite family)
Material	Electrographite (baked carbon-graphite); D374N = carbon-black-based, porous, high commutation
Resistivity (D374)	44 µΩ·m ±30% (JB/T 4003-2001 data)
Resistivity (D374N)	58 µΩ·m ±30% (JB/T 4003-2001 data)
Hardness (D374)	Rockwell 70 (10 mm ball), +67%/-50%
Hardness (D374N)	Rockwell 83 (10 mm ball), +20%/-35%
Density	1.56 g/cm³ (D374); 1.57 g/cm³ (D374N)
Contact Drop (D374N, brush pair)	2.8 V ±35%
Wear (D374N, 50 h)	≤ 0.15 mm
Current Density	10-12 A/cm² (D374 family, CarbonPro chart); D374N rated 12 A/cm²
Max Peripheral Speed	50 m/s (D374 family, CarbonPro chart); D374N 60 m/s
Brush Pressure (D374N)	19,600-39,200 Pa
Sizes (D374B)	2 x (11 x 36 x 44) mm (split/double brush)
Sizes (D374N)	12.5 x 25 x 40; 16 x 25 x 40; 20 x 25 x 40; 20 x 32 x 40; 16 x 32 x 50 mm; custom per drawing
Voltage	Not rated (N/A)
Lead Type	Copper braid shunt with terminal (single/double lead per drawing)
Spring	Not included (brush-holder supplied)
Application	GE railway traction motors; locomotive main generators; turbine-generator exciter motors; rolling mill motors; Z4 DC motors; general AC/DC motors

Compatible Models

This D374B Railway Carbon Brush for GE Motors D374N is designed as a direct replacement for the following machine models and series:

Not sure if it fits your machine? Send us your equipment model, motor type or original part number — our engineers will confirm compatibility and advise the correct grade. Ask an engineer →

Description

This D374B / D374N carbon brush is an electrographite (baked carbon-graphite) brush from the D374 family, used on railway traction motors — including GE locomotive traction motors — as well as locomotive main generators, turbine-generator exciter motors, rolling-mill motors and Z4 series DC motors. D374B is the railway/GE-motor variant, typically supplied as a 2 × (11 × 36 × 44) mm split (double) brush with double copper-braid shunts. D374N is the carbon-black-based electrographite variant characterised by a porous structure, high commutation capability and good commutation performance, intended for high-speed traction DC motors with difficult commutation; per JB/T 4003-2001 data it has resistivity 58 µΩ·m ±30%, Rockwell hardness 83 (10 mm ball) +20%/−35%, density 1.57 g/cm³, a pair contact drop of 2.8 V ±35%, 50 h wear ≤0.15 mm, rated current density 12 A/cm², permissible peripheral speed 60 m/s and recommended brush pressure 19,600–39,200 Pa. The sibling grade D374 (non-N) is softer and more conductive — resistivity 44 µΩ·m ±30%, Rockwell 70, density 1.56 g/cm³ — so the two are not interchangeable without checking commutation behaviour. Brushes are manufactured to your required size and lead arrangement (D374N common sizes 12.5 × 25 × 40, 16 × 25 × 40, 20 × 25 × 40, 20 × 32 × 40, 16 × 32 × 50 mm; D374B 2 × 11 × 36 × 44 mm; custom per drawing).

Features & benefits:

D374B railway variant — GE traction motors, locomotive main generators, AC/DC machines
D374N high-commutation variant — porous carbon-black electrographite, good commutation on difficult high-speed traction motors
JB/T 4003-2001 data: ρ58 µΩ·m, Rockwell 83, 12 A/cm², 60 m/s, wear ≤0.15 mm/50 h
Split-brush option — 2 × (11 × 36 × 44) mm with double shunt for traction service
Custom to your drawing — sizes, lead length and terminal per specification
Quality-inspected before dispatch: dimensional check, lead crimp integrity, and surface condition per batch