Carbon Brush — Saudi Arabia

Carbon Brush Supplier Saudi Arabia — Graphite Brushes for Motors, Generators & Slip Rings

Gulf Union Ozone supplies industrial graphite carbon brushes for electric motors, generators, slip rings, and rotating machines across Saudi Arabia. Our Jeddah warehouse stocks electrographite grades (EG4 through EG365), metal-graphite copper-graphite grades (MG24, MG75, MG124), natural graphite slip ring grades (NG17, NG27), carbon graphite grades (CG2, CG4), and silver-graphite grades (AG3, AG5) — all conforming to IEC 60136, DIN 43138, IEC 60951, NEMA MG1, and BS 4244. Custom dimensions cut to order. ISO 9001:2015 certified (CR 4030570569) with full grade certificates and dimensional inspection reports on every shipment.

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Graphite carbon brushes for electric motors, generators and slip rings — Gulf Union Ozone Saudi Arabia
StandardsIEC 60136 · DIN 43138 · NEMA MG1 · BS 4244
Products55+ Carbon Brush SKUs
DispatchSame-day from Jeddah
QualityISO 9001:2015
DocumentationGrade Certs & Dimensional Reports
Product Types

Product Types in Stock

Gulf Union Ozone stocks the principal carbon brush material families used in industrial rotating electrical machines across Saudi Arabia. Every grade is held in block stock for custom cutting to your motor or generator brush holder dimensions. All shipments include grade certificates, dimensional inspection reports, and certificates of conformance. ISO 9001:2015 certified (CR 4030570569).

Type 01

Electrographite (EG) Brushes

The most widely used carbon brush family in industrial applications. Electrographite grades EG4, EG17, EG34, EG54, EG64, EG98, EG104, EG225, EG317, EG344, and EG365 are manufactured by graphitising carbon at temperatures above 2500°C to produce a low-friction, self-lubricating material. Resistivity range 8–55 μΩ·m; current density up to 15 A/cm²; maximum peripheral speed 35–50 m/s depending on grade. Conforming to IEC 60136, DIN 43138, and IEC 60951. Suitable for DC motors, wound-rotor induction motors, synchronous generators, crane and hoist motors, and compressor drives.

Type 02

Metal Graphite (MG) Brushes

Metal-graphite (copper-graphite) brushes for very high current density at low contact voltage drop. Grades MG24, MG25, MG75, and MG124 contain 70–90% copper by weight sintered with graphite to achieve resistivity as low as 0.5–5 μΩ·m and current densities of 20–50 A/cm². Maximum peripheral speed is limited to 15–20 m/s due to higher hardness and abrasion. Conforming to IEC 60136 and DIN 43138. Principal applications include welding generators, low-voltage high-current DC drives, electroplating rectifier motors, electrolytic plant equipment, and slip ring assemblies carrying large excitation currents.

Type 03

Natural Graphite (NG) & Carbon Graphite (CG) Brushes

Natural graphite grades NG17 and NG27 are soft, low-friction brushes produced from high-purity natural graphite flake, delivering ultra-low contact pressure and minimum film abrasion on collector rings at peripheral speeds up to 60 m/s. Ideal for high-speed turbine generators, aerospace generators, and smooth slip ring surfaces. Carbon graphite grades CG2 and CG4 use a harder carbon-graphite matrix for low-speed DC motors (up to 15 m/s) where commutator film formation is critical. Resistivity 15–80 μΩ·m; Shore hardness 20–45. Conforming to IEC 60136, DIN 43138, and BS 4244. Suitable for turbo-alternators, marine generators, MV slip ring motors, and fractional-HP DC drives.

Type 04

Silver Graphite (AG) Brushes

Silver-graphite brushes contain 10–50% silver by weight, providing very low resistivity (0.3–2 μΩ·m), low contact voltage drop, and stable electrical contact at high frequencies. Grades AG3 (30% Ag), AG5 (50% Ag), and AG10 (10% Ag) are used in precision slip ring assemblies, data transmission rings, instrumentation rotary joints, and radio-frequency equipment where minimal signal distortion is required. Maximum peripheral speed 10–25 m/s. Conforming to IEC 60136. The high silver content provides natural anti-corrosion properties, making AG grades well suited to humid and corrosive industrial environments found in coastal and offshore facilities across Saudi Arabia.

Type 05

Resin-Bonded & Pitch-Bonded Graphite Brushes

Resin-bonded graphite (RST, T924) and pitch-bonded graphite (PB4, P105) grades are manufactured using thermosetting resin or coal-tar pitch binders to achieve controlled porosity, enhanced hardness, and predictable film formation on copper or brass commutator surfaces. Resistivity 20–70 μΩ·m; Shore hardness 60–90 HSD. RST grades are preferred for crane motors, hoisting winches, and variable-speed DC drives where commutator wear must be minimised. Pitch-bonded P105 is suited to large synchronous generator and hydro-turbine brushes where long brush life and stable current sharing between brush sets are critical. Conforming to DIN 43138 and IEC 60951.

Type 06

Specialty Brushes — Grounding, Split-Type & Custom Assemblies

Specialty carbon brush products include shaft grounding brushes (grade GP7, electrographite) for bearing current protection in VFD-driven motors and wind turbines, split-type brush assemblies for field replacement without removing the brush holder, beveled top brushes for high-vibration environments, micro brushes (MB series, 3×5 mm to 6×10 mm) for small precision motors, and constant-force spring box assemblies with pre-loaded phosphor bronze or stainless steel springs conforming to IEC 60136. All specialty brushes are supplied with shunt wires (copper or tinned copper, crimped or brazed) and can be dimensioned to match any OEM brush holder specification. Grade certificates and dimensional inspection reports issued with all orders.

In Summary

Industrial carbon brushes are sliding electrical contacts used in rotating machines — DC motors, AC slip ring motors, alternators, and exciters — to transfer current between the stationary brush holders and the rotating commutator or slip ring. Gulf Union Ozone stocks four principal grades: electrographite (EG) for medium-speed DC motor service at 1.0 to 1.5 A/cm²; carbon-graphite (CG) for slower machines at 0.5 to 1.0 A/cm²; metal-graphite (MG) with copper or silver base for high-current low-voltage service at 8 to 12 A/cm² in traction and plating applications; and natural graphite (NG) for high-speed AC slip ring motors. Grade selection factors include commutator peripheral speed, current density, voltage drop below 1.0 V per brush pair, ambient humidity, and commutation difficulty. Common Saudi Arabia applications include overhead crane motors, centrifugal pump drives, and generator exciters at Aramco power stations. Replace brushes worn below 15mm height or showing chipping or sparking at the commutator. Gulf Union Ozone supplies to OEM drawing dimensions or standard EN 60251 sizes from Jeddah stock.

Product Catalog

Complete Carbon Brush Range — 55+ Products

All grades are stocked in block form in our Jeddah warehouse for same-day or next-day cutting to your required dimensions. Provide the grade, width × thickness × height in mm, shunt wire type, and quantity. Grade certificates, dimensional inspection reports, and Certificates of Conformance are issued with every shipment. Contact our team for cross-referencing to OEM part numbers.

Product Standard / Spec Material Size Range Application
EG4 Electrographite Brush IEC 60136, DIN 43138 Electrographite; resistivity 40–55 μΩ·m; Shore 35–50 HSD 6×10 mm to 32×63 mm; custom cut to order General-purpose DC motors, small fractional-HP commutator motors
EG17 Standard Electrographite Brush IEC 60136, DIN 43138 Electrographite; resistivity 25–40 μΩ·m; Shore 30–45 HSD 8×10 mm to 25×50 mm; standard and custom dimensions Industrial DC motors, commutator machines, traction auxiliaries
EG34 Medium-Hardness Electrographite IEC 60136, DIN 43138, IEC 60951 Electrographite; resistivity 20–35 μΩ·m; Shore 40–55 HSD; max speed 30 m/s 10×16 mm to 40×63 mm Medium-duty industrial DC motors, crane bridge drives, conveyor motors
EG54 High-Current Electrographite IEC 60136, IEC 60951 Electrographite; resistivity 15–25 μΩ·m; current density up to 15 A/cm²; Shore 45–60 HSD 12×20 mm to 50×80 mm High current density DC motors, steel mill main drives, rolling mill motors
EG64 General-Purpose Electrographite IEC 60136, DIN 43138 Electrographite; resistivity 18–30 μΩ·m; Shore 35–50 HSD; max speed 35 m/s 6×10 mm to 32×63 mm AC and DC industrial motors, generators, pumps, compressors
EG98 High-Speed Electrographite IEC 60136, DIN 43138 Electrographite; resistivity 12–20 μΩ·m; Shore 25–40 HSD; max speed 45 m/s 10×16 mm to 25×40 mm High-speed DC motors (>25 m/s), turbine-driven generators, spindle drives
EG104 Traction Motor Electrographite IEC 60136, EN 60136, IEC 60951 Electrographite; resistivity 20–30 μΩ·m; Shore 40–55 HSD; max speed 40 m/s 16×25 mm to 50×80 mm; split type available Railway traction motors, metro and light-rail drives, locomotive traction
EG225 Low-Voltage Electrographite IEC 60136, DIN 43138, IEC 60951 Electrographite; resistivity 10–18 μΩ·m; Shore 30–45 HSD; contact drop <0.8 V 8×12 mm to 20×32 mm 24 V and 48 V DC motors, forklift traction motors, battery-powered drives
EG317 Slip Ring Electrographite IEC 60136, DIN 43138 Electrographite; resistivity 15–25 μΩ·m; Shore 25–40 HSD; max speed 40 m/s 10×16 mm to 32×50 mm Wound rotor induction motor slip rings, slip ring assemblies, exciter rings
EG344 Industrial-Grade Electrographite IEC 60136, DIN 43138, IEC 60951 Electrographite; resistivity 18–30 μΩ·m; Shore 40–55 HSD; max speed 35 m/s 16×25 mm to 40×63 mm Industrial DC generators, rectifier exciter sets, power station auxiliaries
EG365 Generator-Grade Electrographite IEC 60136, IEC 60951, DIN 43138 Electrographite; resistivity 12–22 μΩ·m; Shore 30–45 HSD; max speed 45 m/s 20×32 mm to 63×100 mm; large block stock Large synchronous AC generators, hydro-generators, turbo-alternators
EG4-W Moisture-Resistant Electrographite IEC 60136, DIN 43138 Electrographite with hydrophobic impregnation; Shore 35–50 HSD; max speed 30 m/s 10×16 mm to 32×50 mm Wet or humid environments, wash-down motors, outdoor generator sets
EG54 HD Heavy-Duty Electrographite IEC 60951, DIN 43138 Electrographite; resistivity 15–20 μΩ·m; Shore 50–65 HSD; current density 15 A/cm² 25×40 mm to 80×125 mm; large format blocks Mining equipment motors, dragline and shovel drives, mill motors
EG104 Railway Traction Brush (EN) EN 50238, IEC 60136, IEC 60951 Electrographite; resistivity 18–28 μΩ·m; Shore 45–60 HSD; max speed 40 m/s 20×32 mm to 63×100 mm; split type available Electric railway traction motors (Metro, Haramain HSR), locomotive drives
MG24 Copper-Graphite Brush (75% Cu) IEC 60136, DIN 43138 Sintered copper-graphite; 75% Cu; resistivity 2–5 μΩ·m; Shore 60–80 HSD; max speed 15 m/s 6×10 mm to 20×32 mm High-current slip ring assemblies, low-voltage DC exciters, collector rings
MG25 Metal-Graphite Standard (80% Cu) IEC 60136, DIN 43138 Sintered copper-graphite; 80% Cu; resistivity 1–3 μΩ·m; Shore 65–85 HSD 8×12 mm to 25×40 mm Low-voltage high-current DC machines, battery charger motors, starter generators
MG75 Heavy-Duty Copper-Graphite (85% Cu) IEC 60136, DIN 43138, IEC 60951 Sintered copper-graphite; 85% Cu; resistivity 0.8–2 μΩ·m; Shore 75–95 HSD; current density 40 A/cm² 10×16 mm to 32×50 mm Welding generators, electroplating rectifier motors, galvanising plant drives
MG124 Ultra High-Current Metal-Graphite (90% Cu) IEC 60136, IEC 60951 Sintered copper-graphite; 90% Cu; resistivity 0.5–1.5 μΩ·m; Shore 80–100 HSD; current density 50 A/cm² 12×20 mm to 40×63 mm Electrolytic plant motors, aluminium smelter bus bars, chlor-alkali cell drives
MG Sintered Copper-Graphite (EV Grade) IEC 60136, ISO 8726 Fine-grain sintered copper-graphite; resistivity 1–4 μΩ·m; Shore 65–80 HSD 8×12 mm to 25×40 mm; precision tolerance ±0.05 mm Electric vehicle and hybrid motor slip rings, automotive alternators
NG17 Natural Graphite Slip Ring Brush IEC 60136, DIN 43138 Natural graphite flake; resistivity 20–35 μΩ·m; Shore 15–25 HSD; max speed 50 m/s 10×16 mm to 32×50 mm High-speed wound rotor slip rings, AC generator slip rings, turbine exciters
NG27 Natural Graphite Turbine Generator Brush IEC 60136, DIN 43138, IEC 60951 High-purity natural graphite; resistivity 15–28 μΩ·m; Shore 10–20 HSD; max speed 60 m/s 16×25 mm to 50×80 mm Large turbine generators, nuclear and gas turbine exciters, hydro-alternators
CG2 Carbon Graphite — Low Speed IEC 60136, BS 4244, DIN 43138 Carbon graphite; resistivity 50–80 μΩ·m; Shore 55–70 HSD; max speed 12 m/s 6×10 mm to 16×25 mm Low-speed DC motors, manually controlled DC drives, small industrial machinery
CG4 Carbon Graphite — Medium Speed IEC 60136, BS 4244, DIN 43138 Carbon graphite; resistivity 40–65 μΩ·m; Shore 50–65 HSD; max speed 15 m/s 8×12 mm to 20×32 mm Medium-speed DC motors, DC shunt and compound motors, workshop machines
FE15 Carbon Graphite — Fractional HP IEC 60136, BS 4244 Carbon graphite; resistivity 55–80 μΩ·m; Shore 60–75 HSD; max speed 10 m/s 5×8 mm to 12×20 mm; shunt wire fitted Fractional-HP universal motors, power tools, mixer and blender motors
FE25 Carbon Graphite DC Commutator IEC 60136, DIN 43138 Carbon graphite; resistivity 45–70 μΩ·m; Shore 55–70 HSD; max speed 15 m/s 10×16 mm to 25×40 mm DC shunt motors, series motors, commutator-type AC motors
AG3 Silver-Graphite Brush (30% Ag) IEC 60136, DIN 43138 Silver-graphite; 30% Ag; resistivity 1–3 μΩ·m; Shore 50–70 HSD; max speed 20 m/s 6×10 mm to 16×25 mm; precision ±0.05 mm tolerance Precision slip ring assemblies, signal transmission rings, angle encoders
AG5 Silver-Graphite High-Frequency (50% Ag) IEC 60136, DIN 43138 Silver-graphite; 50% Ag; resistivity 0.5–1.5 μΩ·m; Shore 55–75 HSD; max speed 25 m/s 8×12 mm to 20×32 mm High-frequency slip rings, rotary joints, radar antenna drives, instrumentation
AG10 Silver-Carbon Brush (10% Ag) IEC 60136, DIN 43138 Silver-carbon; 10% Ag; resistivity 3–6 μΩ·m; Shore 45–60 HSD; max speed 15 m/s 6×10 mm to 12×20 mm RF equipment rotary contacts, medical imaging slip rings, low-noise applications
RST Resin-Bonded Graphite Brush DIN 43138, IEC 60136 Resin-bonded graphite; resistivity 25–50 μΩ·m; Shore 65–85 HSD; max speed 25 m/s 10×16 mm to 32×50 mm Crane and hoist motors, variable-speed DC drives, commutator protection
PB4 Pitch-Bonded Graphite Brush IEC 60136, DIN 43138, IEC 60951 Pitch-bonded graphite; resistivity 20–40 μΩ·m; Shore 60–80 HSD; max speed 35 m/s 16×25 mm to 50×80 mm Heavy-duty DC generators, reversing mill drives, steel plant traction
P105 Pitch-Bonded Large Generator Brush IEC 60951, DIN 43138 Pitch-bonded graphite; resistivity 18–35 μΩ·m; Shore 55–75 HSD; max speed 40 m/s 20×32 mm to 80×125 mm; large-format blocks Large synchronous generators, hydro-turbine exciters, power station units
Grade 2S Carbon Graphite (BS) BS 4244, IEC 60136 Carbon graphite; resistivity 60–90 μΩ·m; Shore 50–65 HSD 6×10 mm to 20×32 mm; BS dimensional range Small DC motors, general industrial commutator applications
Grade 4S Electrographite (BS) BS 4244, IEC 60136 Electrographite; resistivity 25–40 μΩ·m; Shore 35–50 HSD; max speed 30 m/s 10×16 mm to 32×50 mm; BS dimensional range Industrial machinery, pumps, fans, general DC and AC commutator motors
Grade M10 Metal-Graphite (BS) — 70% Cu BS 4244, IEC 60136 Sintered copper-graphite; 70% Cu; resistivity 3–7 μΩ·m; Shore 60–80 HSD 8×12 mm to 20×32 mm High current, low voltage applications, starter motor brushes, exciter rings
Grade M25 Metal-Graphite (BS) — 75% Cu BS 4244, IEC 60136 Sintered copper-graphite; 75% Cu; resistivity 2–5 μΩ·m; Shore 65–85 HSD 10×16 mm to 32×50 mm Welding equipment, electroplating, high-current DC generator brushes
Grade S50 Special Electrographite ISO 8726, IEC 60136 Electrographite; resistivity 10–18 μΩ·m; Shore 35–50 HSD; max speed 40 m/s 12×20 mm to 40×63 mm Steel mill motors, rolling mill drives, reversible main drives
Grade T50 Traction Electrographite ISO 8726, IEC 60136, IEC 60951 Electrographite; resistivity 15–25 μΩ·m; Shore 40–55 HSD; max speed 40 m/s 16×25 mm to 50×80 mm Electric traction applications, locomotive traction motors, urban transit
D37 Premium Electrographite (NEMA) NEMA MG1, IEC 60136 Electrographite; resistivity 20–32 μΩ·m; Shore 38–52 HSD; max speed 35 m/s 10×16 mm to 32×50 mm; inch and metric sizes NEMA-frame industrial DC motors, process industry drives, paper mill motors
D3 Standard Carbon Graphite (NEMA) NEMA MG1, IEC 60136 Carbon graphite; resistivity 55–80 μΩ·m; Shore 55–70 HSD; max speed 12 m/s 6×10 mm to 16×25 mm; inch and metric sizes Small NEMA-frame DC motors, bench tools, small industrial drives
G50 Hard Electrographite (NEMA) NEMA MG1, IEC 60136 Electrographite; resistivity 30–45 μΩ·m; Shore 55–70 HSD; max speed 25 m/s 10×16 mm to 25×40 mm Commutator friction and film-forming applications, dusty environments
T924 Resin-Bonded Graphite (Crane Grade) IEC 60136, DIN 43138 Resin-bonded graphite; resistivity 28–50 μΩ·m; Shore 70–90 HSD; max speed 20 m/s 10×16 mm to 32×50 mm Overhead travelling cranes, hoisting winches, gantry crane motors
AL62 Electrographite Slip Ring Grade IEC 60136, DIN 43138 Electrographite; resistivity 12–22 μΩ·m; Shore 25–40 HSD; max speed 50 m/s 16×25 mm to 50×80 mm AC generator slip rings, excitation rings, wound rotor collector assemblies
KS24 Wind Turbine Generator Grade IEC 60136, IEC 60951, GL Wind 2010 Electrographite; resistivity 14–24 μΩ·m; Shore 28–42 HSD; max speed 45 m/s; humidity-stable 12×20 mm to 40×63 mm Wind turbine generator slip rings and collector rings, doubly-fed induction generators
AX24 Marine Electrographite Grade IEC 60136, DIN 43138, DNV-GL Electrographite with anti-corrosion impregnation; resistivity 16–28 μΩ·m; Shore 32–48 HSD 10×16 mm to 32×50 mm Marine propulsion motors, offshore platform generators, FPSO drives
NC11 Natural Graphite-Carbon Slip Ring IEC 60136, DIN 43138 Natural graphite-carbon composite; resistivity 22–38 μΩ·m; Shore 20–35 HSD; max speed 50 m/s 10×16 mm to 25×40 mm Slip rings, collector rings, wound rotor induction motors, brush rocker assemblies
NC12 Natural Graphite-Carbon WRIM Grade IEC 60136, DIN 43138, IEC 60951 Natural graphite-carbon; resistivity 18–32 μΩ·m; Shore 18–30 HSD; max speed 55 m/s 12×20 mm to 32×50 mm Wound rotor induction motors (WRIM), exciter exciters, adjustable-speed MV drives
KNF High-Speed Turbine Grade IEC 60136, DIN 43138 Electrographite; resistivity 8–15 μΩ·m; Shore 20–32 HSD; max speed 60 m/s 8×12 mm to 20×32 mm; precision block format High-speed turbines (>40 m/s), steam turbine generator collector rings
GEC-30 Electrographite (JIS Grade) JIS C4003, IEC 60136 Electrographite; resistivity 18–30 μΩ·m; Shore 35–50 HSD; max speed 35 m/s 10×16 mm to 32×50 mm; JIS and metric dimensions AC/DC industrial motors, Japanese OEM equipment, rotating machinery
EM5 General Industry Grade (JIS) JIS C4003, IEC 60136, DIN 43138 Electrographite; resistivity 22–35 μΩ·m; Shore 38–52 HSD; max speed 30 m/s 8×12 mm to 25×40 mm General industry motors, fan and blower drives, pump motors
Grounding Brush GP7 — Shaft Grounding IEC 60136, IEEE 1100 Electrographite; resistivity 20–35 μΩ·m; Shore 30–45 HSD; low contact pressure spring 6×10 mm to 12×20 mm; ring or block form VFD-driven motor shaft grounding, bearing current protection, wind turbine shaft
Micro Brush MB Series — Small Precision Motors IEC 60136; precision tolerance ±0.02 mm Electrographite or carbon graphite; Shore 35–60 HSD depending on application 3×5 mm to 6×10 mm; ultra-precision miniature format Precision servo motors, medical device motors, miniature DC drives, actuators
Beveled Top EG4 Brush — High Vibration IEC 60136, DIN 43138; beveled top contact face Electrographite; Shore 35–50 HSD; top bevel 30° or 45° machined 10×16 mm to 32×50 mm; bevel angle to specification High-vibration motors, reciprocating compressor drives, mobile equipment
Split-Type Carbon Brush Assembly IEC 60136, DIN 43138; split-type design Electrographite or EG/MG grade; split into two equal halves; shunt wire bridged 20×32 mm to 63×100 mm; split for in-situ replacement Large slip ring assemblies, field replacement without holder removal, generators
Constant-Force Spring Box Assembly IEC 60136; constant-force spring per IEC 60136-4 EG or MG brush + phosphor bronze or SS316 constant-force coil spring; plastic or steel box 12×20 mm to 40×63 mm brush; spring force 0.15–0.45 N/cm² Generator brush holders, automated brush replacement systems, wind turbines
Aerospace Grade Electrographite (ISO 5855) ISO 5855, IEC 60136; aerospace qualification High-purity electrographite; resistivity 10–20 μΩ·m; Shore 25–38 HSD; max speed 50 m/s 6×10 mm to 20×32 mm; certified block stock Aerospace generators, aircraft APU brushes, defense rotating equipment
EG225 LV Battery System Brush IEC 60136, DIN 43138, IEC 60951 Electrographite; resistivity 8–15 μΩ·m; Shore 28–42 HSD; contact drop <0.6 V 6×10 mm to 16×25 mm; low contact voltage drop grade Battery-powered industrial trucks, 24 V–80 V DC traction motors, AGVs
EG317 Wound Rotor Exciter Brush IEC 60136, IEC 60951, DIN 43138 Electrographite; resistivity 14–22 μΩ·m; Shore 28–42 HSD; max speed 45 m/s 12×20 mm to 40×63 mm; long-life low-wear formulation MV wound rotor slip rings, generator exciter rings, power station auxiliary
EG365 Hydro-Generator Brush (Large Format) IEC 60951, IEC 60136, DIN 43138 Electrographite; resistivity 10–18 μΩ·m; Shore 28–40 HSD; max speed 45 m/s; matched sets 32×50 mm to 100×160 mm; large-block matched sets Hydro-generators, large synchronous condensers, pumped-storage units
Custom OEM Cross-Reference Carbon Brush IEC 60136 / DIN 43138 / customer drawing; OEM cross-reference available EG, MG, NG, CG, AG, or PB grade to OEM specification; shunt wire type and length to order Any dimension per OEM datasheet; tolerances to IEC 60136 or tighter Direct OEM replacement for Mersen, Schunk, Morgan, Helwig, Fuji Carbon, SGL grades
Technical Specifications

Carbon Brush Grade Properties & Standards

Key electrical, mechanical, and tribological properties for the principal carbon brush families stocked by Gulf Union Ozone. All values are typical; contact our technical team for grade-specific datasheets and IEC 60136 test reports.

Grade Family Resistivity (μΩ·m) A/cm² Max Speed
Electrographite (EG) 8 – 55 8 – 15 30 – 50 m/s
Metal Graphite (MG) 0.5 – 7 20 – 50 10 – 20 m/s
Natural Graphite (NG) 15 – 35 5 – 10 50 – 60 m/s
Carbon Graphite (CG) 40 – 90 5 – 10 10 – 15 m/s
Silver Graphite (AG) 0.3 – 6 10 – 30 10 – 25 m/s
Resin-Bonded (RST) 20 – 70 6 – 12 20 – 35 m/s
Pitch-Bonded (PB) 15 – 45 8 – 14 25 – 45 m/s
Standard Scope
IEC 60136 Dimensions and classification of carbon brushes for rotating machines
IEC 60951 Carbon brushes for machines: test methods and classification
DIN 43138 German standard: carbon brush dimensions, grades, tolerances
BS 4244 British standard: specification for carbon brushes and holders
NEMA MG1 NEMA standard for motors and generators including brush requirements
ISO 8726 Special electrographite grade test methods and qualification
JIS C4003 Japanese standard for carbon brushes and test requirements
ISO 5855 Aerospace metallic materials and carbon brush qualification
ISO 9001:2015 Gulf Union Ozone Quality Management System — CR 4030570569
Documentation Available Grade certificates (IEC 60951 test data) · Dimensional inspection reports · Certificates of Conformance (CoC) · OEM cross-reference sheets · Packing lists and delivery notes
In Summary

Carbon brush selection for slip-ring induction motors, wound-rotor motors, and DC motors at Saudi Aramco process and utility stations requires careful grade matching to the collector ring material and operating current density. Gulf Union Ozone supplies electrographite grades for wound-rotor motor slip rings (low contact drop, long life at high peripheral speed), resin-bonded graphite grades for DC motor commutators (high film strength at high current density), and metal-graphite grades (copper-graphite, silver-graphite) for low-voltage high-current DC applications at electrochemical plants. Brush grade selection is provided free of charge based on motor nameplate data (voltage, current, speed) and application duty (continuous, intermittent, variable speed). Saudi Aramco and SABIC rotating equipment engineers can contact Gulf Union Ozone for brush grade cross-reference from existing OEM part numbers to equivalent stock grades.

Why Choose Us

Why Industrial Buyers in Saudi Arabia Choose Gulf Union Ozone

⚡

Local Stock — Same-Day Dispatch

Electrographite, metal-graphite, and natural graphite grade blocks are held in our Jeddah safety stock. Orders confirmed by midday ship same day. Emergency carbon brush supply for plant breakdowns and unplanned outages across Saudi Arabia.

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Documentation Ready to Ship

Grade certificates per IEC 60951, dimensional inspection reports, Certificates of Conformance, OEM cross-reference data sheets, and packing lists are prepared and ready to ship with every order. No delays waiting for paperwork.

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ISO 9001:2015 Documented Quality

Our ISO 9001:2015 certified quality management system (CR 4030570569) covers incoming grade verification, dimensional spot checks to IEC 60136 tolerances, and full traceability from mill certificate to packing list for every carbon brush order.

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Nationwide KSA Delivery

Gulf Union Ozone delivers carbon brushes to all 18 Saudi regions. Petrochemical plants in Al Jubail and Yanbu, power plants in Ras Tanura, manufacturing facilities in Riyadh, Dammam, Khobar, Jubail, and Yanbu industrial cities — all served from our Jeddah warehouse.

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Request a Quote

Request a Carbon Brush Quotation

To receive a quotation for carbon brushes, please provide: the brush grade or OEM part number, dimensions (width × thickness × height in mm), shunt wire type (copper or tinned copper, braided or stranded), required quantity, and your target delivery location in Saudi Arabia. For OEM cross-references, share the equipment nameplate data or existing brush markings and our technical team will identify the correct grade equivalent.

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CR 4030570569 | ISO 9001:2015 | Jeddah, Saudi Arabia

Inventory updated: August 2026

In Summary

Gulf Union Ozone carbon brush supply delivers across Saudi Arabia from the Jeddah bonded stock: standard electrographite and resin-bonded brush grades for common motor frame sizes are available same-day in Jeddah, 48–72 hours to Jubail and Dammam, 72–96 hours to Riyadh. Emergency brush supply during motor turnaround at Jubail and Yanbu refineries is supported with next-day delivery from Jeddah for stocked grades. All carbon brushes are supplied with the manufacturer's quality certificate confirming grade designation, resistivity, hardness (Shore), and contact drop at rated current density. Brush holders, tension springs, shunts (flexible pigtails), and brush pressure gauges for maintenance are stocked alongside the brush grades. Custom brush profiles (non-standard dimensions, special face geometry) are machined at the Jeddah workshop within 5–7 working days from approved drawing.

In Summary

Carbon brushes for SWCC desalination plant electrochlorination systems, electrolysis cells, and impressed-current cathodic protection (ICCP) systems use metal-graphite grades with high copper content — typically 50–80% copper — for high-current-density low-voltage DC applications where contact drop must be minimised. Gulf Union Ozone supplies copper-graphite and silver-graphite brush grades for electrolytic applications at SWCC Jubail, Yanbu, and Shuqaiq desalination plants, rated to 400 A/dm² contact current density. Brush spring pressure and holder geometry are critical for electrochemical applications — Gulf Union Ozone provides spring-tension specifications and holder design assistance to maximise contact efficiency and minimise heat generation in electrochlorination cell assemblies. Graphite-only grades (electrographite and natural graphite) for pantograph current collectors and overhead conductor systems at Saudi railway infrastructure (Haramain, SAR, Riyadh Metro) are also stocked. All brush grades are supplied with manufacturer's quality certificates showing resistivity, hardness, and contact drop at rated current.