45° Long Radius Elbow Dimensions
Dat 45° long radius elbow makes a half turn on the same 1.5D centerline radius as its 90° counterpart. It's the fittin' dat lets a line change direction nice and gradual: offsettin' around an obstruction, easin' into a rack, or splittin' the difference on a run dat don't turn square.
Two 45s versus one 90.
A pair of 45° elbows makes a dogleg offset with less pressure loss and a gentler flow path than a square turn, which is why offsets around structural steel and equipment are usually built this way, I tell you what.
Readin' the A dimension.
A is measured from the centerline intersection to the face of either end. Unlike the 90° elbow, it ain't simply 1.5 × NPS, 'cause the geometry of the half turn changes the number, so y'all best take it from the table rather than tryin' to calculate it.
How To Read Dese Dimensions
ASME B16.9 dimensions the 45 degree elbow on the same 1.5D centerline radius as the 90, but that half turn gives it its own center-to-end. That's the A column down below, and it's a tabulated figure rather than a multiple of the nominal size, yessir.
- O.D.
- Outside diameterOutside diameter at the weldin' end, matchin' up perfect with the pipe it welds to.
- I.D.
- Inside diameterBore right through the fitting, set by dat wall thickness.
- T
- Wall thicknessNominal wall at the weldin' end, matched to the pipe schedule.
- A
- Center to endFrom the intersection of the centerlines to the welding face on the half turn. It ain't a simple multiple of the nominal size, so y'all just read it straight from the table.
121 sizes across 6 schedules · dimensions in inches, weights in pounds · ASME B16.9
Schedule STD
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End A | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.622 | 0.109 | 0.62 | 40 | 0.09 |
| ¾ | 1.05 | 0.824 | 0.113 | 0.75 | 40 | 0.10 |
| 1 | 1.32 | 1.049 | 0.133 | 0.88 | 40 | 0.22 |
| 1¼ | 1.66 | 1.380 | 0.140 | 1.00 | 40 | 0.33 |
| 1½ | 1.90 | 1.610 | 0.145 | 1.12 | 40 | 0.43 |
| 2 | 2.38 | 2.067 | 0.154 | 1.38 | 40 | 0.85 |
| 2½ | 2.88 | 2.469 | 0.203 | 1.75 | 40 | 1.70 |
| 3 | 3.50 | 3.068 | 0.216 | 2.00 | 40 | 2.50 |
| 3½ | 4.00 | 3.548 | 0.226 | 2.25 | 40 | 3.40 |
| 4 | 4.50 | 4.026 | 0.237 | 2.50 | 40 | 4.50 |
| 5 | 5.56 | 5.047 | 0.258 | 3.12 | 40 | 7.50 |
| 6 | 6.62 | 6.065 | 0.280 | 3.75 | 40 | 11.70 |
| 8 | 8.62 | 7.981 | 0.322 | 5.00 | 40 | 23.30 |
| 10 | 10.75 | 10.020 | 0.365 | 6.25 | 40 | 40.90 |
| 12 | 12.75 | 12.000 | 0.375 | 7.50 | * | 61.40 |
| 14 | 14.00 | 13.250 | 0.375 | 8.75 | 30 | 78.10 |
| 16 | 16.00 | 15.250 | 0.375 | 10.00 | 30 | 101.00 |
| 18 | 18.00 | 17.250 | 0.375 | 11.25 | * | 128.00 |
| 20 | 20.00 | 19.250 | 0.375 | 12.50 | 20 | 159.00 |
| 24 | 24.00 | 23.250 | 0.375 | 15.00 | 20 | 231.00 |
| 30 | 30.00 | 29.250 | 0.375 | 18.50 | * | 358.00 |
| 36 | 36.00 | 35.250 | 0.375 | 22.25 | * | 518.00 |
| 42 | 42.00 | 41.250 | 0.375 | 26.00 | * | 707.00 |
| 48 | 48.00 | 47.250 | 0.375 | 29.88 | * | 1000.00 |
Schedule XS
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End A | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.546 | 0.147 | 0.62 | 80 | 0.15 |
| ¾ | 1.05 | 0.742 | 0.154 | 0.75 | 80 | 0.16 |
| 1 | 1.32 | 0.957 | 0.179 | 0.88 | 80 | 0.28 |
| 1¼ | 1.66 | 1.278 | 0.191 | 1.00 | 80 | 0.45 |
| 1½ | 1.90 | 1.500 | 0.200 | 1.12 | 80 | 0.61 |
| 2 | 2.38 | 1.939 | 0.218 | 1.38 | 80 | 1.20 |
| 2½ | 2.88 | 2.323 | 0.276 | 1.75 | 80 | 2.00 |
| 3 | 3.50 | 2.900 | 0.300 | 2.00 | 80 | 3.30 |
| 3½ | 4.00 | 3.364 | 0.318 | 2.25 | 80 | 4.50 |
| 4 | 4.50 | 3.826 | 0.337 | 2.50 | 80 | 6.20 |
| 5 | 5.56 | 4.813 | 0.375 | 3.12 | 80 | 10.50 |
| 6 | 6.62 | 5.761 | 0.432 | 3.75 | 80 | 17.00 |
| 8 | 8.62 | 7.625 | 0.500 | 5.00 | 80 | 34.30 |
| 10 | 10.75 | 9.750 | 0.500 | 6.25 | 60 | 53.50 |
| 12 | 12.75 | 11.750 | 0.500 | 7.50 | * | 77.60 |
| 14 | 14.00 | 13.000 | 0.500 | 8.75 | * | 100.00 |
| 16 | 16.00 | 15.000 | 0.500 | 10.00 | 40 | 134.00 |
| 18 | 18.00 | 17.000 | 0.500 | 11.25 | * | 170.00 |
| 20 | 20.00 | 19.000 | 0.500 | 12.50 | 30 | 209.00 |
| 24 | 24.00 | 23.000 | 0.500 | 15.00 | * | 302.00 |
| 30 | 30.00 | 29.000 | 0.500 | 18.50 | 20 | 475.10 |
| 36 | 36.00 | 35.000 | 0.500 | 22.25 | 20 | 686.10 |
| 42 | 42.00 | 41.000 | 0.500 | 26.00 | * | 936.10 |
| 48 | 48.00 | 47.000 | 0.500 | 29.88 | * | 1250.00 |
Schedule 40
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End A | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.622 | 0.109 | 0.62 | 40 | 0.09 |
| ¾ | 1.05 | 0.824 | 0.113 | 0.75 | 40 | 0.10 |
| 1 | 1.32 | 1.054 | 0.133 | 0.88 | 40 | 0.22 |
| 1¼ | 1.66 | 1.380 | 0.140 | 1.00 | 40 | 0.33 |
| 1½ | 1.90 | 1.610 | 0.145 | 1.12 | 40 | 0.43 |
| 2 | 2.38 | 2.072 | 0.154 | 1.38 | 40 | 0.85 |
| 2½ | 2.88 | 2.474 | 0.203 | 1.75 | 40 | 1.70 |
| 3 | 3.50 | 3.068 | 0.216 | 2.00 | 40 | 2.50 |
| 3½ | 4.00 | 3.548 | 0.226 | 2.25 | 40 | 3.40 |
| 4 | 4.50 | 4.026 | 0.237 | 2.50 | 40 | 4.50 |
| 5 | 5.56 | 5.044 | 0.258 | 3.12 | 40 | 7.50 |
| 6 | 6.62 | 6.060 | 0.280 | 3.75 | 40 | 11.70 |
| 8 | 8.62 | 7.976 | 0.322 | 5.00 | 40 | 23.30 |
| 10 | 10.75 | 10.020 | 0.365 | 6.25 | 40 | 40.90 |
| 12 | 12.75 | 11.938 | 0.406 | 7.50 | 40 | 65.00 |
| 14 | 14.00 | 13.124 | 0.438 | 8.75 | 40 | 80.00 |
| 16 | 16.00 | 15.000 | 0.500 | 10.00 | 40 | 105.00 |
| 18 | 18.00 | 16.876 | 0.562 | 11.25 | 40 | 130.00 |
| 20 | 20.00 | 18.812 | 0.594 | 12.50 | 40 | 165.00 |
| 24 | 24.00 | 22.624 | 0.688 | 15.00 | 40 | 235.00 |
Schedule 80
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End A | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.546 | 0.147 | 0.62 | 80 | 0.15 |
| ¾ | 1.05 | 0.742 | 0.154 | 0.75 | 80 | 0.16 |
| 1 | 1.32 | 0.962 | 0.179 | 0.88 | 80 | 0.28 |
| 1¼ | 1.66 | 1.278 | 0.191 | 1.00 | 80 | 0.45 |
| 1½ | 1.90 | 1.500 | 0.200 | 1.12 | 80 | 0.61 |
| 2 | 2.38 | 1.944 | 0.218 | 1.38 | 80 | 1.20 |
| 2½ | 2.88 | 2.328 | 0.276 | 1.75 | 80 | 2.00 |
| 3 | 3.50 | 2.900 | 0.300 | 2.00 | 80 | 3.30 |
| 3½ | 4.00 | 3.364 | 0.318 | 2.25 | 80 | 4.50 |
| 4 | 4.50 | 3.826 | 0.337 | 2.50 | 80 | 6.20 |
| 5 | 5.56 | 4.810 | 0.375 | 3.12 | 80 | 10.50 |
| 6 | 6.62 | 5.756 | 0.432 | 3.75 | 80 | 17.00 |
| 8 | 8.62 | 7.620 | 0.500 | 5.00 | 80 | 34.30 |
| 10 | 10.75 | 9.562 | 0.594 | 6.25 | 80 | 55.00 |
| 12 | 12.75 | 11.374 | 0.688 | 7.50 | 80 | 80.00 |
| 14 | 14.00 | 12.500 | 0.750 | 8.75 | 80 | 100.00 |
| 16 | 16.00 | 14.312 | 0.844 | 10.00 | 80 | 135.00 |
| 18 | 18.00 | 16.124 | 0.938 | 11.25 | 80 | 175.00 |
| 20 | 20.00 | 17.938 | 1.031 | 12.50 | 80 | 210.00 |
| 24 | 24.00 | 21.562 | 1.219 | 15.00 | 80 | 305.00 |
Schedule 160
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End A | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.464 | 0.188 | 0.62 | 160 | 1.80 |
| ¾ | 1.05 | 0.612 | 0.219 | 0.75 | 160 | 2.00 |
| 1 | 1.32 | 0.820 | 0.250 | 0.88 | 160 | 3.00 |
| 1¼ | 1.66 | 1.160 | 0.250 | 1.00 | 160 | 3.50 |
| 1½ | 1.90 | 1.338 | 0.281 | 1.12 | 160 | 3.70 |
| 2 | 2.38 | 1.692 | 0.344 | 1.38 | 160 | 5.00 |
| 2½ | 2.88 | 2.130 | 0.375 | 1.75 | 160 | 3.70 |
| 3 | 3.50 | 2.624 | 0.438 | 2.00 | 160 | 5.60 |
| 4 | 4.50 | 3.438 | 0.531 | 2.50 | 160 | 5.60 |
| 5 | 5.56 | 4.310 | 0.625 | 3.12 | 160 | 15.00 |
| 6 | 6.62 | 5.182 | 0.719 | 3.75 | 160 | 28.00 |
| 8 | 8.62 | 6.808 | 0.906 | 5.00 | 160 | 48.00 |
| 10 | 10.75 | 8.500 | 1.125 | 6.25 | 160 | 72.00 |
| 12 | 12.75 | 10.126 | 1.312 | 7.50 | 160 | 98.00 |
| 14 | 14.00 | 11.188 | 1.406 | 8.75 | 160 | 130.00 |
| 16 | 16.00 | 12.812 | 1.594 | 10.00 | 160 | 180.00 |
| 18 | 18.00 | 14.438 | 1.781 | 11.25 | 160 | 260.00 |
| 20 | 20.00 | 16.062 | 1.969 | 12.50 | 160 | 390.00 |
| 24 | 24.00 | 19.312 | 2.344 | 15.00 | 160 | 560.00 |
Schedule XXS
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End A | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.252 | 0.294 | 0.62 | * | 1.80 |
| ¾ | 1.05 | 0.434 | 0.308 | 0.75 | * | 2.00 |
| 1 | 1.32 | 0.604 | 0.358 | 0.88 | * | 3.00 |
| 1¼ | 1.66 | 0.896 | 0.382 | 1.00 | * | 3.50 |
| 1½ | 1.90 | 1.100 | 0.400 | 1.12 | * | 3.70 |
| 2 | 2.38 | 1.508 | 0.436 | 1.38 | * | 5.00 |
| 2½ | 2.88 | 1.776 | 0.552 | 1.75 | * | 3.70 |
| 3 | 3.50 | 2.300 | 0.600 | 2.00 | * | 6.00 |
| 4 | 4.50 | 3.152 | 0.674 | 2.50 | * | 10.40 |
| 5 | 5.56 | 4.060 | 0.750 | 3.12 | * | 19.20 |
| 6 | 6.62 | 4.892 | 0.864 | 3.75 | * | 30.00 |
| 8 | 8.62 | 6.870 | 0.875 | 5.00 | * | 50.00 |
| 10 | 10.75 | 8.750 | 1.000 | 6.25 | 140 | 75.00 |
| 12 | 12.75 | 10.750 | 1.000 | 7.50 | 120 | 95.00 |
Materials We Supply
45° Long Radius Elbow to ASME B16.9 in the grades below. Tell us the service and we'll confirm the right one for y'all.
| Material | Specification | Typical Service |
|---|---|---|
| Carbon Steel | ASTM A234 WPB / WPC | General process, steam, oil and gas gathering and utility lines |
| Low-Temp Carbon Steel | ASTM A420 WPL6 | Cold service to −50°F; LNG and northern pipeline work |
| Chrome-Moly Alloy | ASTM A234 WP11 / WP22 / WP91 | Elevated temperature; refinery heaters, power plant steam |
| Stainless Steel | ASTM A403 WP304/304L, WP316/316L | Corrosive service, chemical, food and beverage, water treatment |
| Duplex & Super Duplex | ASTM A815 UNS S31803 / S32750 | Chloride and seawater service, offshore, desalination |
Questions Folks Ask Us
What is a 45 degree elbow used for?
Changin' direction by a half turn, typically to offset a line around an obstruction, to ease into or out of a pipe rack, or to follow a grade. Two 45° elbows in series create a smooth dogleg with less pressure loss than a pair of 90s, I tell you what.
What's dat center-to-end of a 45 degree elbow?
It follows from the 1.5D bend radius and the half turn, and it ain't 1.5 × NPS the way a 90° elbow is. Use the A column in the table above for the exact figure at your size and schedule.
Can I use two 45s instead of a 90?
Yessir, and it's mighty common practice for offsets. Dat flow path runs gentler and your pressure loss is lower than a single square turn, though it'll cost you one extra weld and a bit more overall length, I tell you what.
