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Carbon Brushes

NKF634 Carbon Brush

Part No. NKF634

NKF634 natural-graphite carbon brush — National 634 (NCC634) equivalent grade for turbo-generator slip rings, wind-turbine and diesel-generator service. Rated 8–12 A/cm², Shore 16; stocked in 20×32×80, 32×40×80 and 32×32×64 mm sizes with flexible copper leads.

Material	NKF634
Dimensions	- Stock sizes (per supplier listings): 20 × 32 × 80 mm; 32 × 40 × 80 mm; 32 × 32 × 64 mm — confirm s
Current Density	8.0–12.0 A/cm²
Hardness	Shore 16

Compatible Models

NKF634 (Morgan/National 634 designation) National/Morgan NCC634 (grade equivalent) Morgan LFC554 (cross-equivalent thermal-power service) Siemens/Turbine cross-reference: HTGG308276 BroadCarbon cross-reference: 61010063 Related 634-grade parts: GE 323B7988P01 / 323B7988P05 / 323B7988P07 NZ634 (南征)

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Technical Specifications

Specification	Value
Grade	NKF634 (National 634 / NCC634 equivalent)
Material	Natural graphite
Current Density	8.0–12.0 A/cm² (ring service, Morgan data)
Max Surface Speed	Not published (634 natural-graphite family ≈ 81 m/s typical)
Resistivity	25 µΩ·m (Morgan NKF634 data)
Density	1.28 g/cm³ (Morgan NKF634 data)
Hardness	Shore 16 (Morgan NKF634 data)
Friction Coefficient	0.25 (Morgan NKF634 data)
Stock Sizes	20×32×80; 32×40×80; 32×32×64 mm (custom per drawing)
Voltage	Not rated (N/A)
Lead Type	Flexible copper braid with terminal (per drawing; 12V starter wire-lead type available)
Spring	Not included (brush-holder supplied)
Application	Turbo-generator slip rings; wind-turbine generators; diesel-generator starters; exciter positions
Cross References	NCC634 · LFC554 · HTGG308276 · 61010063 · GE 323B7988P01/P05/P07

Compatible Models

This NKF634 Carbon Brush is designed as a direct replacement for the following machine models and series:

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Description

This NKF634 carbon brush is a natural-graphite brush equivalent to the National/Morgan 634 (NCC634) grade, widely specified for power-generation slip-ring duty. The naturally graphitic material provides low electrical loss, medium contact drop, low friction and stable film formation, making it a proven choice for thermal-power turbo-generator slip rings, exciter positions, wind-turbine generators and diesel-generator starter motors. The brush is supplied to your required size — commonly stocked as 20×32×80, 32×40×80 and 32×32×64 mm — with a flexible copper-braid shunt lead and terminal, ready for installation in the corresponding brush holder.

Features & benefits:

National 634 / NCC634-equivalent grade — proven natural-graphite material for generator slip-ring duty.
Cross-referenced part numbers — NCC634, LFC554, HTGG308276, 61010063, GE 323B7988P01/P05/P07.
Multiple stocked sizes — 20×32×80, 32×40×80, 32×32×64 mm; custom sizes per drawing.
Reliable contact — flexible copper-braid shunt lead with terminal (wire-lead 12 V starter type available).
Power-generation proven — turbo-generator slip rings, wind-turbine generators, diesel-generator starters.
Quality-inspected before dispatch: dimensional check, lead crimp integrity, and surface condition per batch.