Eaton FD40 — MIL-C-4109 Push-to-Connect Air Quick Coupler

The Eaton FD40 — MIL-C-4109 Push-to-Connect Air Quick Coupler is a air quick-disconnect coupling from Eaton's Aeroquip range. One-hand push-to-connect industrial-interchange air coupler with ball latching — MIL-C-4109 dimensional compatibility for compressed air and pneumatic tool service. Brass female / steel male halves; 360° swivel prevents hose kinking.

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

Construction & features

• Interchange standard: MIL-C-4109
• Connection method: Push-to-Connect
• Valving: Valved (Self-sealing Poppet)
• Meets MIL-C-4109 dimensional requirements (industrial interchange)
• Automatic sleeve for one-hand push-to-connect operation
• Ball latching mechanism with pin latch
• Protective sleeve lock prevents accidental disconnection
• 360° swivels eliminate hose kinking
• Female half: brass body with self-sealing poppet valve
• Male half: carbon steel zinc-plated, straight-through non-valved design
• Both Female NPT and Male NPT port thread options
• Interchanges with: Industrial Interchange (MIL-C-4109), ARO 310, Hansen 3000, Foster 3 Series

Available variants — specify in your RFQ

Indus quotes the full FD40 range; specify the configuration that matches your hose end and operating envelope. The Eaton part-number scheme is FD40-XXXX-AA-BB (series, half/material code, port thread size in 16ths of an inch, nominal coupling size in 16ths of an inch).

• Coupling halves: Male, Female, Dust Cap/Plug
• Body sizes: 1/4", 3/8", 1/2"
• Body materials: Female: Brass; Male: Carbon Steel (zinc trivalent chromate plated)
• Seal materials: Buna-N
• Port thread types: Female NPT, Male NPT

Sample part numbers: FD40-1013-04-04, FD40-1014-04-04, FD40-1054-06-06, FD40-1055-08-08. The full part-number matrix is available on request — Indus will quote any standard configuration in the Eaton catalogue.

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
• Vacuum rating: 28 in./Hg
• Operating temperature range: -40°C to +100°C (varies by seal compound; specify in RFQ)

Applications

• Compressed air supply
• Pneumatic tool service
• Workshop air-line drops
• Mobile compressor air supply
• MIL-C-4109 industrial-interchange replacement

How to order

Confirm (a) the exact Eaton part number you require, or (b) the configuration parameters: coupling half (male / female / complete set / repair kit / dust cap), body size, port thread type and designation, seal compound, body material. Indus will quote ex-Eaton with full mill certification, NACE / ABS / Lloyd's options on request, and air-freight or sea-freight options to UAE / GCC. Standard lead time 14 days from order; in-stock items ship same week.

Companion products

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