$0.00 Login/Create Account (509) 482-4435 Products Services & Processing Resources About Contact Pipe Size Chart A pipe, unlike tubing, is typically measured and called out by nominal pipe size (NPS) or inside diameter, organized in a pipe size chart. NPS is a North American standard set of measurements that designate pipe diameter and pipe wall thickness (schedule). In comparison to pipe dimensions, measuring tubing is by the OUTSIDE DIAMETER, specified in decimal or fractional inches. In most applications, the pipe is offered in American standard sizes, which are used in aluminum, carbon steel, and stainless steel pipe. For pipe sizes .125” through 12”, NPS signifies nominal inside diameter. For sizes larger than 12”, NPS signifies the actual outside diameter of the pipe. For engineers, the most important information about the pipe is the size, or the inside diameter, which is used for line sizing calculations. Increasing the schedule, or wall thickness, increases the mechanical strength of the pipe, allowing it to handle greater internal pressures. Alcobra stocking schedules are as follows, in order of increasing thickness: 10 20 30 40 80 View All Piping Sizes Pipe Dimensions & Schedule As the pipe schedule changes, so does the internal diameter. The diameter ID can be calculated easily if the schedule is known. The pipe ID equals the pipe nominal bore or nominal diameter minus the wall thickness twice. For the purpose of standardization, the American National Standards Institute published ANSI B36.10, which broadened the range of available wall thicknesses to schedule 10 through schedule 160. The schedule numbers indicate an approximate value of 1000 times pressure-stress ratios. Schedule = 1000 x (P/S) where P is the internal service pressure of the pipe (PSIG) and S is the ultimate tensile strength of the pipe material (psi). Typical wall thickness tolerances are usually no more than 12.5% under the schedule specified, depending on the standards used in the pipe’s manufacture. The dimensions in the table below may vary +/- a few thousandths. Please contact us with any other questions you may have regarding available pipe sizes you may be interested in. 0.125" O.D. Sch # Wall I.D. Stainless Aluminum 0.405 40 0.068 0.269 T304/T316 6061 0.405 80 0.095 0.215 0.25" O.D. Sch # Wall I.D. Stainless Aluminum 0.54 40 0.088 0.364 T304/T316 6061 0.54 80 0.119 0.302 0.375" O.D. Sch # Wall I.D. Stainless Aluminum 0.675 40 0.091 0.493 T304/T316 6061 0.675 80 0.126 0.423 0.5" O.D. Sch # Wall I.D. Stainless Aluminum 0.84 40 0.109 0.622 T304/T316 6061/6063 0.84 80 0.147 0.546 T304/T316 6061 0.75" O.D. Sch # Wall I.D. Stainless Aluminum 1.05 40 0.0113 0.824 T304 6061/6063 1.05 80 0.154 0.742 T304/T316 6061 160 0.218 0.612 XXHY 0.308 0.434 1" O.D. Sch # Wall I.D. Stainless Aluminum 1.315 0.083 1.149 1.315 0.095 1.125 1.315 10 0.109 1.097 1.315 0.125 1.065 1.315 40 0.133 1.049 T304/T316 6061/6063 1.315 80 0.179 0.957 T304 6061 1.315 XXHY 0.358 0.599 1.25" O.D. Sch # Wall I.D. Stainless Aluminum 1.66 5 0.065 1.53 1.66 0.095 1.47 1.66 10 0.109 1.442 1.66 0.125 1.41 1.66 40 0.14 1.38 T304/T316 6061/6063 1.66 80 0.191 1.278 6061 1.66 160 0.25 1.16 1.66 XXHY 0.382 0.896 1.5" O.D. Sch # Wall I.D. Stainless Aluminum 1.9 5 0.065 1.774 1.9 10 0.109 1.682 1.9 0.125 1.65 1.9 40 0.145 1.61 T304 6061/6063 1.9 80 0.2 1.5 T304 6061 1.9 160 0.281 1.338 1.9 XXHY 0.4 1.1 2" O.D. Sch # Wall I.D. Stainless Aluminum 2.375 5 0.065 2.245 2.375 10 0.109 2.157 T304 2.375 40 0.154 2.067 T304 6061/6063 2.375 80 0.218 1.939 T304/T316 6061 2.375 160 0.343 1.687 2.375 XXHY 0.436 1.5 2.5" O.D. Sch # Wall I.D. Stainless Aluminum 2.875 5 0.083 2.709 2.875 10 0.12 2.635 2.875 0.156 2.563 2.875 40 0.203 2.469 T304/T316 6061/6063 2.875 0.25 2.375 2.875 80 0.276 2.323 T304 6061 2.875 160 0.375 2.125 2.875 XXHY 0.552 1.771 3" O.D. Sch # Wall I.D. Stainless Aluminum 3.5 5 0.078 3.344 3.5 10 0.120 3.26 T304 3.5 0.188 3.124 3.5 40 0.216 3.068 T304/T316 6061/6063 3.5 0.281 2.938 3.5 80 0.3 2.9 6061 3.5 160 0.437 2.624 3.5 XXHY 0.6 2.3 3.5" O.D. Sch # Wall I.D. Stainless Aluminum 4 5 0.083 3.834 4 10 0.12 3.76 T304 4 40 0.226 3.548 T304/T316 6061/6063 4 0.25 3.5 4 80 0.318 3.364 6061 4 XXHY 0.636 2.728 4" O.D. Sch # Wall I.D. Stainless Aluminum 4.5 5 0.083 4.334 4.5 10 0.12 4.26 T304 4.5 0.203 4.094 4.5 40 0.237 4.026 T304/T316 6061 4.5 60 0.281 3.938 4.5 0.312 3.876 4.5 80 0.337 3.826 T304 6061 4.5 120 0.438 3.624 4.5 160 0.531 3.438 4.5 XXHY 0.674 3.152 5" O.D. Sch # Wall I.D. Stainless Aluminum 5.563 5 0.109 5.345 5.563 10 0.134 5.313 5.563 40 0.258 5.047 T304/T316 6061/6063 5.563 0.312 4.939 5.563 80 0.375 4.813 5.563 120 0.5 4.563 5.563 160 0.625 4.313 5.563 XXHY 0.75 4.06 6" O.D. Sch # Wall I.D. Stainless Aluminum 6.625 0.094 6.437 6.625 5 0.109 6.407 6.625 10 0.134 6.357 6.625 0.141 6.343 6.625 0.25 6.125 6.625 40 0.28 6.065 T304/T316 6061/6063 6.625 0.344 5.937 6.625 80 0.432 5.761 T304/T316 6061/6063 6.625 0.5 5.625 6.625 120 0.562 5.501 6.625 0.625 5.375 6.625 160 0.719 5.187 6.625 XXHY 0.864 4.897 6.625 1.125 4.375 8" O.D. Sch # Wall I.D. Stainless Aluminum 8.625 5 0.109 8.407 8.625 0.12 8.385 8.625 0.141 8.343 8.625 10 0.148 8.329 8.625 20 0.25 8.125 8.625 30 0.277 8.071 8.625 40 0.322 7.981 6061 8.625 0.375 7.875 8.625 60 0.406 7.813 8.625 0.438 7.749 8.625 80 0.5 7.625 8.625 0.562 7.501 8.625 100 0.593 7.437 8.625 120 0.719 7.187 8.625 140 0.812 7.001 8.625 XXHY 0.875 6.875 8.625 160 0.906 6.813 10" O.D. Sch # Wall I.D. Stainless Aluminum 10.75 5 0.134 10.48 10.75 10 0.165 10.42 10.75 0.188 10.374 10.75 0.237 10.276 10.75 20 0.25 10.25 10.75 0.279 10.192 10.75 30 0.307 10.136 10.75 40 0.365 10.02 10.75 0.375 10 10.75 60 0.5 9.75 10.75 0.562 9.626 10.75 80 0.593 9.562 10.75 0.625 9.5 10.75 100 0.719 9.312 10.75 0.812 9.126 10.75 120 0.844 9.062 10.75 140/XXHY 1 8.75 10.75 160 1.125 8.5 12" O.D. Sch # Wall I.D. Stainless Aluminum 12.75 0.172 12.406 12.75 0.219 12.312 12.75 20 0.25 12.25 12.75 30 0.33 12.09 12.75 0.344 12.062 12.75 STD 0.375 12 12.75 40 0.406 11.938 12.75 XHY 0.5 11.75 12.75 60 0.562 11.626 12.75 80 0.688 11.374 12.75 0.75 11.25 12.75 100 0.84 11.062 12.75 120/XXHY 1 10.75 12.75 140/XXHY 1.125 10.5 12.75 160 1.312 10.126 14" O.D. Sch # Wall I.D. Stainless Aluminum 14 0.237 13.526 14 10 0.25 13.5 14 0.281 13.438 14 20 0.312 13.376 14 0.344 13.312 14 30 0.375 13.25 14 40 0.438 13.124 14 0.459 13.082 14 XHY 0.5 13 14 60 0.594 12.812 14 80 0.75 12.5 14 0.812 12.376 14 100 0.938 12.124 14 120 1.094 11.812 14 140/XXHY 1.25 11.5 14 160 1.406 11.188 16" O.D. Sch # Wall I.D. Stainless Aluminum 16 10 0.25 15.5 16 0.281 15.438 16 20 0.312 15.376 16 0.344 15.312 16 30 0.375 15.25 16 0.406 15.188 16 0.469 15.062 16 40/XHY 0.5 15 16 0.562 14.876 16 60 0.656 14.688 16 80 0.844 14.376 16 100 1.031 13.938 16 120 1.219 13.562 16 140/XXHY 1.438 13.124 16 160 1.594 12.812 Take Advantage of Our Precision Laser Cutting Services If you need a custom laser cut for your project, feel free to reach out for a quote today. Or give us a call if you have questions about any of our premium metals or processing services, We’ll be happy to help! 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