ASTM A312 Stainless Steel Pipe Weight Chart

What does the "S" mean in Schedule (e.g., SCH 40S)?

In ASTM A312/ANSI B36.19, the "S" stands for Stainless.Stainless steel schedules (5S, 10S, 40S, 80S) often have different wall thicknesses than carbon steel schedules (which follow ANSI B36.10). For example, a SCH 40 carbon steel pipe may be thicker or thinner than a SCH 40S stainless steel pipe depending on the NPS.

 

What are the wall thickness tolerances for ASTM A312?

According to ASTM A312, the wall thickness at any point shall not vary more than:

Over: 20.0% of nominal wall thickness.

Under: 12.5% of nominal wall thickness.

What is the formula to calculate ASTM A312 Stainless Steel Pipe weight?

For a quick manual calculation, you can use the following formula:
Metric ( kg/m ):Weight (kg/m) = (OD - WT) * WT * 0.02491
Imperial (lb/ft):Weight (lb/ft) = (OD - WT) * WT * 10.69
(Where OD = Outside Diameter in mm/inch and WT = Wall Thickness in mm/inch)

 

ASTM A312 Stainless Steel Pipe Weight Chart 

Weights are based on the density of stainless steel (approx. 7.93 g/cm³ for TP304 and 7.98 g/cm³ for TP316).

NPS (Inch)	Outside Diameter (mm)	Schedule (SCH)	Wall Thickness (mm)	Weight ( kg/m )	Weight (lb/ft)
1/2"	21.34	10S	2.11	1.02	0.69
1/2"	21.34	40S	2.77	1.29	0.87
3/4"	26.67	10S	2.11	1.30	0.87
3/4"	26.67	40S	2.87	1.71	1.15
1"	33.40	10S	2.77	2.13	1.43
1"	33.40	40S	3.38	2.55	1.71
1-1/2"	48.26	10S	2.77	3.16	2.12
1-1/2"	48.26	40S	3.68	4.12	2.77
2"	60.33	10S	2.77	4.00	2.69
2"	60.33	40S	3.91	5.53	3.72
3"	88.90	10S	3.05	6.57	4.41
3"	88.90	40S	5.49	11.47	7.71
4"	114.30	10S	3.05	8.51	5.72
4"	114.30	40S	6.02	16.35	10.99

 

How is "Nominal Pipe Size" (NPS) different from "Outside Diameter" (OD)?

For pipes under 14 inches, the NPS does not match the actual OD (e.g., a 2" pipe has an OD of 2.375" or 60.33mm).

For pipes 14 inches and larger, the NPS is exactly equal to the OD.

 

ASTM A312 Steel Pipes Tolerance

ASTM A312 Diameter Tolerance, astm a312 dimensional tolerances

NPS	ASTM A312/ASME SA312 OD Tolerance
	+		–
	inch	mm	inch	mm
1/8 to 1 1 /2 > 1 1 /2 to 4 > 4 to 8 > 8 to 18 > 18 to 26 > 26 to 34 > 34 to 48	1/64(0.015) 1/32(0.031) 1/16(0.062) 3/32(0.093) 1/8(0.125) 5/32(0.156) 3/16(0.187)	0.4 0.8 1.6 2.4 3.2 4.0 4.8	1/32(0.031) 1/32(0.031) 1/32(0.031) 1/32(0.031) 1/32(0.031) 1/32(0.031) 1/32(0.031)	0.8 0.8 0.8 0.8 0.8 0.8 0.8

 

What is the dimensions for ASTM A312 stainless steel pipe?

The dimensional specifications for ASTM A312 stainless steel pipes are governed by the ASME B36.10 and ASME B36.19 standards. Their Nominal Pipe Size (NPS) range spans from a few inches up to 30 inches (with outside diameters ranging from 10.3 mm to 762 mm), while wall thicknesses are defined according to Schedules such as 5S, 10S, 40S, and 80S.

Dimensions Chart for ASTM A312 Stainless Steel Pipe (ASME B36.19)

NPS (Inch)	DN (mm)	Outside Diameter (OD) (mm)	SCH 5S (WT mm)	SCH 10S (WT mm)	SCH 40S (WT mm)	SCH 80S (WT mm)
1/8"	6	10.29	1.00	1.24	1.73	2.41
1/4"	8	13.72	1.20	1.65	2.24	3.02
3/8"	10	17.15	1.20	1.65	2.31	3.20
1/2"	15	21.34	1.65	2.11	2.77	3.73
3/4"	20	26.67	1.65	2.11	2.87	3.91
1"	25	33.40	1.65	2.77	3.38	4.55
1-1/4"	32	42.16	1.65	2.77	3.56	4.85
1-1/2"	40	48.26	1.65	2.77	3.68	5.08
2"	50	60.33	1.65	2.77	3.91	5.54
2-1/2"	65	73.03	2.11	3.05	5.16	7.01
3"	80	88.90	2.11	3.05	5.49	7.62
4"	100	114.30	2.11	3.05	6.02	8.56
5"	125	141.30	2.77	3.40	6.55	9.53
6"	150	168.28	2.77	3.40	7.11	10.97
8"	200	219.08	2.77	3.76	8.18	12.70
10"	250	273.05	3.40	4.19	9.27	12.70*
12"	300	323.85	3.96	4.57	9.53	12.70*

 

What is the difference between ASME B36.19 and B36.10?

B36.19: Specifically created for Stainless Steel. It features lighter wall thicknesses (like SCH 5S and 10S) to save costs, as stainless steel is stronger and more corrosion-resistant than carbon steel.
B36.10: The standard for Carbon Steel and wrought iron pipes. While many dimensions overlap (like SCH 40 and 40S), B36.10 includes much heavier wall schedules (SCH 100, 120, 140, 160).

 

Is there a weight difference between TP304 and TP316?

The difference is negligible for standard calculations,While TP316 is slightly denser (approx. 8,000 kg/m ³) than TP304 (approx. 7,930 kg/m ³) due to the Molybdenum content, the industry standard uses the same weight factors for both in most commercial charts.

 

 

ASTM A312 TP316/316L Stainless Steel Pipe Manufacture

We maintain a ready stock of standard-specification (SCH 10S, SCH 40S) TP304 and TP316 materials, ensuring immediate shipment within 7 to 15 days.
In addition to piping, we also supply a comprehensive range of complementary pipe fittings-including flanges, elbows, and tees-designed to help clients streamline their procurement processes and eliminate the tedious complexities associated with sourcing various components individually.

 

We provide complete Material Test Certificates (MTCs) that comply with EN 10204 3.1 or 3.2 standards. Third-party inspections (by SGS, BV, TUV, Lloyd's) can be arranged, including non-destructive testing (UT/ET), hydrostatic testing, intergranular corrosion testing, and more.