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Air Brake Line Couplings for Tractors, Trucks & Trailers. All of the below couplings are manufactured in Great Britain to BS AU 138a:1980 and BS AU 138b:2000. Air brake couplings are used to connect the air brake systems of a heavy goods vehicle's (HGV) or agricultural machines to trailers. All couplings have colour coded labels - yellow for the service line and red for the emergency line – and anodised aluminium outer sleeves of the female couplings to match.

Standards
BS AU 138a:1980 
BS AU 138b:2000

                                        

                                                    

Air Brake Couplings

                                                    

BS AU 138a:1980

BS AU 138a:1980
Air Brake C Couplings
  • Standard: BS AU 138a: 1980

  • Valve Type: Valveless 

  • Material: Carbon Steel 

  • Finishing: Zn-Fe (Cr III) 

  • Thread: 1/2" BSP

1/2" BSP Male Valveless

Air Brake C Couplings
  • Standard: BS AU 138a: 1980

  • Valve Type: Valveless

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) 

  • Thread: 1/2" BSP 

M22 Female Valveless

Air Brake C Couplings
  • Standard: BS AU 138a: 1980

  • Valve Type: Valveless

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) 

  • Threads: M22 x 1.5 Metric

M22 Male Valveless

Air Brake C Couplings
  • Standard: BS AU 138a: 1980

  • Valve Type: Valveless

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) 

  • Threads: M22 x 1.5 Metric

Self Sealing Valve - 1/2" BSP

Air Brake Seal Sealing Valve
  • Standard: BS AU 138a: 1980

  • Valve Type: Valveless

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) 

  • Threads: M22 x 1.5 Metric

Self Sealing Valve - M22 x 1.5

Air Brake Seal Sealing Valve
  • Standard: BS AU 138a: 1980

  • Valve Type: Valveless

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) 

  • Threads: M22 x 1.5 Metric

BS AU 138b:2000

BS AU 138b:2000

1/2" BSP Female Valved

Air Brake C Couplings
  • Standard: BS AU 138b:2000

  • Valve Type: Valved

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) Black Passivated 

  • Thread: 1/2" BSP

  • Standard Seals: NBR

M22 Female Valved

Air Brake C Couplings
  • Standard: BS AU 138b:2000

  • Valve Type: Valved

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) Black Passivated 

  • Thread: M22 x 1.5

  • Standard Seals: NBR

M16 Female Valved

Air Brake C Couplings
  • Standard: BS AU 138b:2000

  • Valve Type: Valved

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) Black Passivated 

  • Thread: M16 x 1.5

  • Standard Seals: NBR

1/2" BSP Valveless with Valve Lifter

Air Brake C Couplings
  • Standard: BS AU 138b:2000

  • Valve Type: Valveless with Valve Lifter

  • Material: Carbon Steel 

  • Finishing: Zn-Fe (Cr III) 

  • Thread: 1/2" BSP

M22 Valveless with Valve Lifter

Air Brake C Couplings
  • Standard: BS AU 138b:2000

  • Valve Type: Valveless with Valve Lifter

  • Material: Carbon Steel 

  • Finishing: Zn-Fe (Cr III) 

  • Thread: M22 x 1.5 Metric

1/2" BSP Male 'C' Coupling with Self Sealing Valve

Air Brake C Couplings
  • Standard: BS AU 138b:2000

  • Valve Type: Valved

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) Black Passivated 

  • Thread: 1/2" BSP

  • Standard Seals: NBR

M22 Male 'C' Coupling with Self Sealing Valve

Air Brake C Couplings
  • Standard: BS AU 138b:2000

  • Valve Type: Valved

  • Material: Carbon Steel

  • Finishing: Zn-Fe (Cr III) Black Passivated 

  • Thread: M22 x 1.5

  • Standard Seals: NBR

Trailer 'C' Coupling Male 1/2" BSP

Air Brake C Couplings
  • Standard: BS AU 138b:2000

  • ​Valve Style: Valveless

  • Material: Carbon Steel 

  • Zinc-nickel and black passivation plated

  • Threads: 1/2" BSP

Trailer 'C' Coupling Male M22 x 1.5

Air Brake C Couplings
  • Standard: BS AU 138b:2000

  • ​Valve Style: Valveless

  • Material: Carbon Steel 

  • Zinc-nickel and black passivation plated

  • Threads: M22 x 1.5

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