MIL-C-4109 Manual-Retract Air Coupler

The MIL-C-4109 Manual-Retract Air Coupler is a air quick-disconnect coupling in the Indus QC-AMR range. Manual-retract ball-latch industrial-interchange air coupler designed specifically for compressed air. Uses Eaton FD40 Series male tips. Protective collar prevents accidental snagging and disconnection.

Working pressure to 21 bar (305 psi) at the smallest body size, with minimum burst pressure of 560 bar. Manual Retract connection — valved (self-sealing poppet) variant.

Construction & features

• Interchange standard: MIL-C-4109
• Connection method: Manual Retract
• Valving: Valved (Self-sealing Poppet)
• Interchanges with: MIL-C-4109 industrial interchange (uses FD40 male tips), Eaton FD43

Available variants — specify in your RFQ

Indus supplies the full QC-AMR range. Specify the configuration that matches your hose end and operating envelope and we will quote against it.

• Coupling halves: Female (uses FD40 male tips), SOCKETLESS™ hose end, Dust Cap/Plug
• Body sizes: 1/4", 3/8", 1/2"
• Body materials: Carbon Steel (zinc trivalent chromate plated)
• Seal materials: Neoprene
• Port thread types: Female NPT, Male NPT

Performance

• Maximum operating pressure: 21 bar (305 psi) at the smallest size; derates with diameter
• Minimum burst pressure: 560 bar (8122 psi)
• Rated flow (largest size): up to 80 L/min
• Operating temperature range: -40°C to +100°C (varies by seal compound; specify in RFQ)

Replacing an existing coupling?

This coupler is dimensionally interchangeable with Eaton FD43, and with MIL-C-4109 industrial interchange (uses FD40 male tips). If you are matching an existing fleet, quote the coupling you are replacing on the RFQ and we will confirm the mating half before you order.

How to order

Confirm the coupling half (male / female / complete set / dust cap), body size, port thread type and size, seal compound and body material. Indus quotes with material certification on request, and air-freight or sea-freight to the UAE and wider GCC. Standard lead time 14 days from order; stocked configurations ship the same week.

Companion products

Indus also supplies the matching dust caps, dust plugs and seal repair kits for this series — add them to the same RFQ. For a hose assembly terminated with this coupler, request a complete assembly quote and we will supply it tested at 1.5× working pressure with a witness-test certificate.