Aero 300 - A30 Locking And Non-Locking Fuel Cap

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Locking Non-Locking
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These English fuel caps are used on most of the worlds super cars and bikes, and some series production aero planes. They are beautifully made in forged and bright anodized aluminum. The high precision and easy to operate mechanism is very secure and non vented. They are designed to keep the fuel in and the water out. The lock is there to ensure that your tank is free from contaminants. Aero caps are used on Adam, CAP, Cirrus, Diamond, Lancair Columbia, Lancair kits, Nemesis, Vans, Velocity and many more aircraft.

Two keys come with the locking version (L). Fixing can be by rivet, bolt, weld or glass in as appropriate. These are flush caps of outstanding quality which are ideal for virtually any homebuilt aircraft.

The 300 Series: 3-3/4" OD opening 1-3/4", 6 hole 3" pcd. A37 fits 2" and 2.25" Hoses.
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  • Centre-Forging: Aluminium Alloy 6082
  • Neck: Aluminium Alloy 6082/T6
  • Option: Black
  • Neck: Polished

  • No Lock: 136.6 g
  • Locking: 154.5 g

  • Outside Diameter (A): 62.5 mm
  • Outside Diameter (B): 58.4 mm
  • Bolt Circle Dia.: (PCD) Not Applicable
  • Bore: 44.5 mm
  • Overall Height : 33.75 mm

Neck Options:
  • Spigot: 58.0 mm A3NLP (Lock, steel neck)
  • Body Diameter: G 58.0 mm A3NLPB (Lock, steel neck, black)
  • Neck Diameter: Not Applicable
  • Flange Thickness: Not Applicable

In The Box

  • 1 - Set of Keys for Locking Only (L)
  • Frequently Purchased With
  • Customers Also Viewed


I am biased! This picture shows the Aero A30*-RV with a curved flange to fit most Vans wings. *=L or S as wanted. It used to be sold by Vans as a luxury option. For flatter wings like the RV 10 the flat rivet flange A30*-R Is better. These caps can only be fitted while building the tanks.

Robin V
May 5, 2020


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

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