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Seamless Carbon Steel Tubing, 0.38 Inch OD, 0.05 Inch Thick, 0.28 Inch ID

Description & Features

This seamless low carbon steel tubing is annealed for superior bending and flaring, conforming to SAE J524 specifications. Designed with an outer diameter of 0.38 inches, a wall thickness of 0.05 inches, and an inner diameter of 0.28 inches, it provides exceptional reliability for demanding applications.

With a burst pressure of 14,373 psi and a maximum working pressure of 2,396 psi, this tubing is built to handle high-pressure environments. Its tensile strength is rated at 55,000 psi, ensuring durability and performance under stress. The product also features a safety factor of 6:1, highlighting its robustness and dependability.

The seamless carbon steel tubing's pressure ratings are based on SAE Specification J1065, utilizing the conservative Barlow formula to ensure accurate and safe operation parameters. It has a rated flow of 2.8 and an inside area of 0.0602.

Brand: Marmon/Keystone

Catalog Number: C1BK88

Supplier Part Number: 3/8.049

Specifications

Burst Pressure 14373	Brand Marmon/Keystone	Brand Marmon - Keystone	Pack Size 12.00	UOM FT	I.D. 0.277 in	Inside Area 0.06	Maximum Working Pressure 2396	O.D. 0.375 in	Rated Flow 2.80	Safety Factor 6:1	Supplier Part Number 3/8.049	Wall Thickness 0.05	Alternate Part Numbers Alternate Part Number C1BK88, Alternate Part Number MI-08754324, Alternate Part Number MINO-01965X80001	Product Weight 0.15 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 (2)

Question by: Daryl R on Nov 28, 2025, 11:45 AM

trying to match up tubing i’ve already got, is this one 3/8 OD with about a .049 wall?

Answer by: Customer Support on Nov 29, 2025, 5:14 PM

The outside diameter is 0.375 inch and the wall thickness is 0.049 inch, which puts the inside diameter at 0.277 inch.

Question by: Rick C on Dec 2, 2025, 12:17 PM

got a brake line project, is this tube the kind that’ll bend and flare without fighting me too much?

Answer by: Customer Support on Dec 4, 2025, 8:15 AM

Being annealed low carbon steel to SAE J524, it’s made for bending and flaring work. The size on this one is 0.375 inch OD with about a 0.049 inch wall and a 0.277 inch ID, so you can match it up to the tooling and fittings meant for that tubing size.