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Seamless Carbon Steel Tubing, 0.25 Inch OD, 0.05 Inch Thick, 0.15 Inch ID

Description & Features

Marmon/Keystone offers seamless carbon steel tubing annealed for optimal bending and flaring, adhering to SAE J524 specifications. This tubing boasts a maximum working pressure of 3593 psi and a burst pressure of 21560 psi, ensuring durability and reliability in various industrial applications.

With a tensile strength of 55,000 psi and a wall thickness of 0.05 inches, our tubing ensures high performance. The inside diameter of 0.15 inches and outside diameter of 0.25 inches provide precise flow control with a rated flow of 0.8, making it ideal for numerous mechanical systems.

To ensure safety, the tubing conforms to the stringent SAE J1065 specifications, incorporating a safety factor of 6:1, meeting rigorous industry standards.

Supplier Part Number: 1/4.049

Specifications

Burst Pressure 21560	Brand Marmon/Keystone	Brand Marmon - Keystone	Pack Size 12.00	UOM FT	I.D. 0.152 in	Inside Area 0.02	Maximum Working Pressure 3593	O.D. 0.25 in	Rated Flow 0.80	Safety Factor 6:1	Supplier Part Number 1/4.049	Wall Thickness 0.05	Alternate Part Numbers Alternate Part Number C1AF29, Alternate Part Number MI-08763852, Alternate Part Number MINO-01965X80008	Product Weight 0.23 lbs

Similar Products

Model Number	O.D.	Wall Thickness	I.D.	Inside Area	Rated Flow	Maximum Working Pressure	Burst Pressure	Safety Factor
1/2.049 Seamless Carbon Steel Tubing	0.5 in	0.049	0.402 in	0.1269	6	1797	10780	6:1
1/2.065 Seamless Carbon Steel Tubing	0.5 in	0.065	0.37 in	0.1075	4.9	2383	14300	6:1
1/4.049 Seamless Carbon Steel Tubing	0.25 in	0.049	0.152 in	0.0181	0.8	3593	21560	6:1
3/8.049 Seamless Carbon Steel Tubing	0.375 in	0.049	0.277 in	0.0602	2.8	2396	14373	6:1
3/8.065 Seamless Carbon Steel Tubing	0.375 in	0.065	0.245 in	0.0471	2.6	3178	19067	6:1
5/8.095 Seamless Carbon Steel Tubing	0.63 in	0.095	0.435 in	0.1485	6.9	2787	16720	6:1
1-1/4.095 Seamless Carbon Steel Tubing	1.25 in	0.095	1.06 in	0.882	41	1393	8360	6:1
1-1/4.120 Seamless Carbon Steel Tubing	1.25 in	0.12	1.01 in	0.8008	36.7	1760	10560	6:1
1.065 Seamless Carbon Steel Tubing	1 in	0.065	0.87 in	0.5942	28.1	1192	7150	6:1
1.120 Seamless Carbon Steel Tubing	1 in	0.12	0.76 in	0.4534	20.7	2200	13200	6:1
1/2.083 Seamless Carbon Steel Tubing	0.5 in	0.083	0.334 in	0.0876	4	3043	18260	6:1
3/16.035 Seamless Carbon Steel Tubing	0.1875 in	0.035	0.1175 in	0.0108	0.4	3422	20533	6:1
3/4.049 Seamless Carbon Steel Tubing	0.75 in	0.049	0.652 in	0.3337	15.4	1198	7187	6:1
3/4.065 Seamless Carbon Steel Tubing	0.75 in	0.065	0.62 in	0.3018	12	1589	9533	6:1
3/4.095 Seamless Carbon Steel Tubing	0.75 in	0.095	0.56 in	0.2462	11	2322	13933	6:1
3/4.109 Seamless Carbon Steel Tubing	0.75 in	0.109	0.532 in	0.2222	10.6	2664	15987	6:1
5/8.065 Seamless Carbon Steel Tubing	0.63 in	0.065	0.495 in	0.1923	9	1907	11440	6:1

Product Questions & Answers (3)

Question by: Jimmy K on Mar 16, 2026, 4:09 PM

what kind of pressure can this tubing handle before I run into trouble? looking for the working max.

Answer by: Customer Support on Mar 17, 2026, 9:23 PM

Rated for a maximum working pressure of 3593 psi, the line provides a very strong safety margin. A 6:1 safety factor means the actual burst pressure reaches up to 21560 psi to help protect your system against severe spikes.

Question by: Janet C on Feb 28, 2026, 7:29 PM

tubing says it's annealed -- does that mean it'll bend without cracking or do I still need a tube bender on the smaller radius stuff?

Answer by: Customer Support on Mar 2, 2026, 6:19 AM

Annealing is specifically what makes this tubing cooperative for bending and flaring work. The SAE J524 spec requires it to be in that softened state, so the material has enough ductility to handle forming without fracturing along the bend. A proper tube bender is still the right call for tight-radius work, but the annealed condition means you're not fighting a stiff, work-hardened tube that wants to kink or split on you.

Question by: Duane A on Apr 26, 2025, 5:25 PM

Hey, can this tubing handle a good bit of pressure? I'm working on a project where things can get pretty intense.

Answer by: Customer Support on Apr 27, 2025, 6:55 PM

Based on SAE J1065, it can handle a maximum working pressure of 3593 psi. The burst pressure is rated much higher, at 21560 psi.