AN Blanking Caps

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£3.08

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Seal Male AN 37° Flare Connections

Seal open male AN hose and fitting connections with our aluminium AN Blanking Caps. Designed with a female AN 37° flare connection, each cap provides a secure closure for fuel, oil, coolant and other compatible fluid systems.

Why Choose Our AN Blanking Caps?

37° Flare Connection

The female connection seals directly against the 37° flare of a compatible male AN fitting, providing a secure fluid seal without an O-ring or thread sealant.
6061-T6 Aluminium Construction

Precision-machined from lightweight 6061-T6 aluminium for an excellent combination of strength and low weight.
Black Anodised Finish

Protects against wear and corrosion while providing a clean, professional appearance.

Designed for Male AN Connections

These female caps are designed specifically for male AN 37° flare connections. Always match the AN size of the cap to the connection being sealed and check that both flare sealing surfaces are clean and undamaged before installation.

Type: AN Blanking Cap For closing male AN hose and fitting connections
Material: 6061-T6 Aluminium Lightweight and durable
Finish: Black Anodised Protects against wear and corrosion

Connection 1: AN Female JIC 37° · Female cone flare

Available aluminium AN blanking cap sizes
Product Code	Connection 1
CAP-BNK-AN-AL-AN3	AN3 Female 3/8"-24 UNF
CAP-BNK-AN-AL-AN4	AN4 Female 7/16"-20 UNF
CAP-BNK-AN-AL-AN6	AN6 Female 9/16"-18 UNF
CAP-BNK-AN-AL-AN8	AN8 Female 3/4"-16 UNF
CAP-BNK-AN-AL-AN10	AN10 Female 7/8"-14 UNF
CAP-BNK-AN-AL-AN12	AN12 Female 1 1/16"-12 UNF
CAP-BNK-AN-AL-AN16	AN16 Female 1 5/16"-12 UNF

Fuel Systems
Oil Systems
Coolant Systems
Braided Hoses
AN Adapters
Temporary Line Closure

Free repair or replacement for two years from the date of purchase. Learn more

Frequently Asked Questions

What are AN blanking caps used for?
AN blanking caps are used to close open male AN connections on hoses, adapters and other fluid-system components.
What type of connection do these caps fit?
They have a female AN connection and are designed to fit a corresponding male AN 37° flare connection.
How do AN blanking caps seal?
The fluid seal is created where the female 37° flare inside the cap seats against the 37° flare of the male AN connection. The UNF thread holds the two sealing surfaces together but does not itself provide the fluid seal.
Do AN blanking caps require an O-ring?
No. The connection seals on the mating 37° flare surfaces and does not require an O-ring.
Should I use PTFE tape or thread sealant?
No. Thread sealant or PTFE tape should not be used on the AN thread. The connection seals on the 37° flare rather than on the thread.
What are the AN blanking caps made from?
They are precision-machined from 6061-T6 aluminium and finished with black anodising for protection against wear and corrosion.