Brass flare fittings: a buyer's guide
In short
Brass flare fittings (45 degree SAE) connect soft copper tubing without solder: a flare nut presses the flared tube end against the fitting's cone to make a metal-to-metal seal. They are sized by the tube's outside diameter. Supply Tie sells ATC brass flare nuts, caps, plugs, unions, elbows and flare x pipe adapters in packs of 5 at supplytie.com, and ships to the lower 48 states.
Brass flare fittings in stock
| Fitting | Sold by | Pack price | Per fitting | Link |
|---|---|---|---|---|
| ATC 1/4 in. brass flare nut 6JC050810721033 | Pack of 5 | $8.99 | $1.80 |
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| ATC 3/8 in. brass flare nut 6JC050810721035 | Pack of 5 | $9.85 | $1.97 |
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| ATC 1/2 in. brass flare nut 6JC050810721036 | Pack of 5 | $12.99 | $2.60 |
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| ATC 1/4 in. brass forged flare nut 6JC050810721021 | Pack of 5 | $10.60 | $2.12 |
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| ATC 3/8 in. brass forged flare nut 6JC050810721022 | Pack of 5 | $11.99 | $2.40 |
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| ATC 1/2 in. brass forged flare nut 6JC050810721023 | Pack of 5 | $15.99 | $3.20 |
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| ATC 1/4 in. brass flare cap 6JC050810721012 | Pack of 5 | $8.99 | $1.80 |
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| ATC 3/8 in. brass flare cap 6JC050810721014 | Pack of 5 | $10.55 | $2.11 |
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| ATC 1/2 in. brass flare cap 6JC050810721015 | Pack of 5 | $11.20 | $2.24 |
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| ATC 1/4 in. brass flare plug 6JC050810721020 | Pack of 5 | $7.95 | $1.59 |
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| ATC 3/8 in. brass flare plug 6JC120110701085 | Pack of 5 | $12.99 | $2.60 |
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| ATC 1/2 in. brass flare plug 6JC120110701086 | Pack of 5 | $14.99 | $3.00 |
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| ATC 3/8 in. brass union 6JC120110701090 | Pack of 5 | $16.99 | $3.40 |
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| ATC 1/2 in. brass union 6JC120110701092 | Pack of 5 | $20.45 | $4.09 |
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| ATC 5/8 in. brass union 6JC120110701095 | Pack of 5 | $27.00 | $5.40 |
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| ATC 3/8 in. flare x 1/4 in. flare brass reducing union 6JC120110701098 | Pack of 5 | $14.45 | $2.89 |
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| ATC 1/2 in. flare x 3/8 in. flare brass reducing union 6JC120110701091 | Pack of 5 | $18.99 | $3.80 |
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| ATC 1/4 in. brass 90 degree elbow 6JC126310721011 | Pack of 5 | $14.95 | $2.99 |
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| ATC 3/8 in. brass 90 degree elbow 6JC126310721013 | Pack of 5 | $24.05 | $4.81 |
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| ATC 1/2 in. brass 90 degree elbow 6JC126310721014 | Pack of 5 | $28.15 | $5.63 |
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| ATC 1/4 in. flare x 1/4 in. male pipe brass adapter 6JC120110701062 | Pack of 5 | $10.99 | $2.20 |
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| ATC 3/8 in. flare x 3/8 in. male pipe brass adapter 6JC120110701070 | Pack of 5 | $14.60 | $2.92 |
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| ATC 1/2 in. flare x 1/2 in. male pipe brass adapter 6JC120110701074 | Pack of 5 | $17.45 | $3.49 |
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| ATC 5/8 in. flare x 1/2 in. male pipe brass adapter 6JC120110701077 | Pack of 5 | $28.99 | $5.80 |
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| ATC 3/4 in. flare x 1/2 in. male pipe brass adapter 6JC120110701079 | Pack of 5 | $37.45 | $7.49 |
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Prices as listed on supplytie.com on Nov 12, 2026; they can change. Shipping for your ZIP code shows in the cart before checkout. Repeat and volume orders can be quoted: send your list for a free bulk price check.
How to choose
- Size: match the flare size to the tube OD (1/4, 3/8, 1/2, 5/8 or 3/4 in.).
- Angle: these are 45 degree SAE flare. Hydraulic 37 degree JIC fittings are a different system; see JIC hydraulic fittings.
- Type: unions join two tubes; adapters go from tube to a pipe thread; caps and plugs close off a line; elbows turn 90 degrees.
- Nut: forged (long) nuts for lines that vibrate; standard nuts for fixed runs.
- Gas and refrigerant: follow the appliance maker's instructions and local code; leak test every joint.
Shop all: brass fittings · valves and fittings · gas and water connectors. Related: brass compression fittings · hose barb fittings · copper sweat fittings
About Supply Tie
Founded in 2023, Supply Tie carries 100,000+ products for warehouses, plants, contractors and facilities and ships to the lower 48 states. Lead times vary by item and vendor; see Shipping & Returns. Approved business accounts can order on Net 30 terms, and volume pricing is available on repeat orders.
Questions? support@supplytie.com
FAQ
What are brass flare fittings used for?
45 degree SAE brass flare fittings connect soft copper tubing, and some aluminum tubing, without solder. They are common on gas appliance connectors, refrigeration and HVAC lines, oil burner lines and water lines to ice makers and humidifiers.
How are flare fittings sized?
The flare size is the outside diameter (OD) of the tube: a 3/8 in. flare fitting fits 3/8 in. OD tubing. Adapters list the flare size first and the pipe thread (NPT) size second, such as 3/8 in. flare x 1/2 in. male pipe.
Can 45 degree flare fittings be used with 37 degree JIC fittings?
No. 45 degree SAE flare fittings and 37 degree JIC (hydraulic) fittings have different seat angles and will not seal together, even when the threads look the same.
Forged flare nut or standard flare nut?
Forged flare nuts are longer and heavier and support the tube further back from the flare, which helps against vibration. Standard (short) flare nuts are fine for most fixed connections.
How do I make a flare connection?
Slide the flare nut onto the tube first, cut the tube square, deburr it, form the 45 degree flare with a flaring tool, then tighten the nut onto the fitting. Do not use thread sealant on the flare face; the metal-to-metal flare is the seal.
Where can I buy brass flare fittings?
Supply Tie (supplytie.com) sells ATC brass flare nuts, caps, plugs, unions, elbows and flare x pipe adapters in 1/4 to 3/4 in. As of Nov 12, 2026, prices start at $1.59 per fitting in packs of 5; orders ship to the lower 48 states.