Adapter, -4AN»5/8x18 Inv Flare, BLK
Quick Overview
- Adapter, -4 AN JIC male to 5/8"-18 inverted flare
- Fits 3/8 inch SAE inverted flare ports
- 45-degree inverted flare, metal-to-metal seal
- No tape or sealant needed
- E85 compatible, black anodized 6061-T6 aluminum
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$6.86
per EACH (USD)Adapter, -4 AN JIC Male to 5/8"-18 SAE Inverted Flare Male, Black
Connects -4 AN plumbing to a 3/8" SAE inverted flare port or fitting.
The Racetronix ADF-4J5818IF has a -4 AN JIC male (37° flare) on one end and a 5/8"-18 SAE 45° inverted flare male on the other, the thread used on 3/8" steel hard line. Thread the inverted flare end into a factory port such as a fuel filter, carburetor, regulator or brake/fuel junction that takes a 3/8" inverted flare tube nut, and connect -4 AN hose to the JIC end.
Key features
- -4 AN JIC male (37° flare).
- 5/8"-18 SAE inverted flare male (45°), for 3/8" line ports.
- Straight one-piece body.
- E85 compatible.
- 6061-T6 aluminum, black anodized.
Both ends seal metal to metal on their flares: 37° on the AN end and 45° on the inverted flare end. Do not use Teflon tape or thread sealant on either end.
Specifications
| Part number | ADF-4J5818IF |
| JIC end | -4 AN JIC male, 7/16"-20 thread, 37° flare |
| Inverted flare end | 5/8"-18 SAE inverted flare male, 45° seat, for 3/8" tube |
| Material | 6061-T6 aluminum, black anodized |
| Fuel compatibility | Gasoline and E85 |
Lookup chart
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| Part number | AN JIC male | Inverted flare male |
|---|---|---|
| ADF-4J71624IF | -4 AN | 7/16-24 (1/4" tube) |
| ADF-4J5818IF | -4 AN | 5/8-18 (3/8" tube) |
| ADF-6J71624IF | -6 AN | 7/16-24 (1/4" tube) |
| ADF-6J1220IF | -6 AN | 1/2-20 (5/16" tube) |
| ADF-6J5818IF | -6 AN | 5/8-18 (3/8" tube) |
| ADF-6J1116118IF | -6 AN | 11/16-18 (7/16" tube) |
| ADF-8J1220IF | -8 AN | 1/2-20 (5/16" tube) |
| ADF-8J5818IF | -8 AN | 5/8-18 (3/8" tube) |
Frequently asked questions
Will it work with a bubble flare port?
No. SAE inverted flare uses a 45° double flare. ISO bubble flare ports, common on European cars, have a different seat and will not seal with this fitting.
Is the AN flare the same as the inverted flare?
No. AN/JIC uses a 37° flare and inverted flare uses 45°. The two do not seal against each other, which is why this adapter is needed.
Is it E85 compatible?
Yes. It is made from 6061-T6 aluminum and black anodized, and works with gasoline and E85.
Questions and support
Not sure which fitting your build needs? Email [email protected] before you order.
Racetronix provides technical support to verified customers through our support forum, not by phone or email. Please request forum access when you place your order so your account is approved before your parts arrive. The forum is moderated, open 24/7, and holds a knowledge base going back to 1999.









