Brass Bulkhead Union

DOT-certified brass reducing tees enable seamless tubing integration in air brake systems. Featuring a male NPT-threaded port, standard compression port, and smaller compression port, these fittings facilitate secure transitions between different tubing sizes while maintaining leak-proof integrity under 150 PSI operating pressure.

DOT Air Brake Compression Fittings

DOT Brass Bulkhead Unions: Secure Bulkhead Penetration for Air Brake Systems
Engineered for commercial vehicle safety, these DOT-certified brass compression fittings create vibration-resistant, leak-proof connections between nylon tubing sections across bulkheads. Their pass-through design enables rapid disconnection/reconnection while maintaining FMVSS 121 compliance in critical air brake applications.

DOT Bulkhead Union: Vibration-Resistant Structural Design

1. Dual-Nut Compression System

• Central Sleeve Assembly: Precision-machined brass sleeve penetrates bulkhead holes with ±0.1mm tolerance
• Bidirectional Locking: Interior/exterior hex nuts torque to 35-40 N·m for vibration-proof fixation
• Universal Compatibility: Adjustable sleeve accommodates 3-25mm bulkhead thicknesses
• Anti-Rotation Feature: 12-point flange hex design prevents tool slippage during installation

2. Dual-Barb Sealing Technology

• Axial Lock: Integrated 45° barbs create mechanical interlock with nylon tubing (prevents slippage under 250N pull force)
• Radial Seal: Tapered compression chamber deforms tubing outer wall to form helium-tight seal at 150 PSI
• Dual-Security Principle: Combines barb retention (axial) + taper compression (radial) for FMVSS 121 compliance

Bulkhead Union: Critical Integration for Air Brake Systems

1. System Integration & Modular Connectivity

Centralized Connection Hub
Bulkhead unions serve as FMVSS 121-compliant junction points between air tanks, brake chambers, and control valves. This configuration:

• Isolates pneumatic modules while maintaining system integrity
• Enables 45% faster maintenance access versus hard-piped systems
• Supports ISO 15170 modular design standards for commercial vehicles

Plug-and-Play Serviceability
The union’s bidirectional coupling allows subsystem replacement in <15 minutes without:

• Depressurizing main air circuits
• Disrupting adjacent components
• Requiring specialized tools

2. High-Pressure Sealing & Vibration Resistance

Leak-Proof Operation
Maintains <0.25 SCFM leakage at 150 PSI through:

• Radial compression sealing (SAE J2490 compliant)
• MIL-STD-889 distortion-resistant threading
• 100% helium mass spec testing protocol

Shock & Vibration Performance
Withstands 15G vibration loads (SAE J1455) by:

• Distributing harmonic energy through hexagonal load paths
• Preventing micro-movement with serrated flange interfaces
• Absorbing impulse shocks via brass deformation zone

DOT Air Brake Compression Fittings Specification

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