Polyethylene tubing sizes (LLDPE): 1/8 to 3/4 in and 4 to 12 mm OD × ID × wall, plus Liquiflex POE — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/polyethylene-tubing-lldpe-sizes/  (sheet CC BY 4.0)
Basis: Freelin-Wade polyethylene catalog pages (LLDPE inch and metric, Liquiflex POE); one maker; numbers only; pressure ratings left out
Catalog version: 2026-10-20

Sizes: see table below
- Polyethylene tubing is sold by OD with the ID set by the wall; the sizes read are Freelin-Wade's linear low-density polyethylene (LLDPE) line: 1/8 in OD (0.062 ID, 0.031 wall), 5/32 (0.106, 0.025), 1/4 (0.170, 0.040), 5/16 (0.187, 0.062), 3/8 (0.250, 0.062), 1/2 (0.375, 0.062), 5/8 (0.500, 0.062), 3/4 (0.625, 0.062) and 3/4 × 0.500 (0.125 wall) in; metric 4 × 2.7, 6 × 4, 8 × 6, 10 × 8 and 12 × 9 mm. The catalog page says Freelin-Wade no longer offers low-density polyethylene (LDPE). 'Poly tubing' for drip irrigation is sold in similar ID × OD sizes: drip-irrigation-tubing-sizes.
- Liquiflex POE (polyolefin, listed separately) is 1/4 in OD × 1/8 in ID (0.062 wall) and 3/8 in OD × 0.245 in ID (0.062 wall). Each ID and wall was checked against OD − 2 × wall: the LLDPE rows agree to within 0.004 in (0.1 mm for the metric rows); the POE 3/8 in row does not quite (3/8 − 2 × 0.062 is 0.251 in against the printed ID 0.245 in), and both printed values are shown. 
- Bend radius is shown (inches, as printed) for the inch LLDPE and POE rows; the datasheet's metric bend radii are not copied (printed without units, in the text read). Working pressures at 75 °F and 150 °F and part numbers are left out. Other tubing: nylon-tubing-inch-metric-sizes, tygon-vinyl-tubing-e-3603-sizes, ptfe-fep-pfa-tubing-fractional-sizes, silicone-tube-and-fittings. No files: tubing is not drawn as a fixed shape.

family  OD as listed  OD, in  OD, mm  ID, in  ID, mm  wall, in  wall, mm  bend radius, in (as printed)
LLDPE (inch)  1/8  0.125  3.18  0.062  1.57  0.031  0.79  1/2
LLDPE (inch)  5/32  0.1562  3.97  0.106  2.69  0.025  0.64  1
LLDPE (inch)  1/4  0.25  6.35  0.170  4.32  0.040  1.02  1-1/4
LLDPE (inch)  5/16  0.3125  7.94  0.187  4.75  0.062  1.57  1-1/2
LLDPE (inch)  3/8  0.375  9.53  0.250  6.35  0.062  1.57  2
LLDPE (inch)  1/2  0.5  12.70  0.375  9.53  0.062  1.57  2-1/2
LLDPE (inch)  5/8  0.625  15.88  0.500  12.70  0.062  1.57  3
LLDPE (inch)  3/4  0.75  19.05  0.625  15.88  0.062  1.57  4
LLDPE (inch)  3/4  0.75  19.05  0.500  12.70  0.125  3.18  2.5
LLDPE (metric)  4 mm  0.1575  4  0.106  2.7  0.026  0.65  —
LLDPE (metric)  6 mm  0.2362  6  0.157  4  0.039  1  —
LLDPE (metric)  8 mm  0.315  8  0.236  6  0.039  1  —
LLDPE (metric)  10 mm  0.3937  10  0.315  8  0.039  1  —
LLDPE (metric)  12 mm  0.4724  12  0.354  9  0.059  1.5  —
Liquiflex POE (polyolefin, inch)  1/4  0.25  6.35  0.125  3.18  0.062  1.57  .75
Liquiflex POE (polyolefin, inch)  3/8  0.375  9.53  0.245  6.22  0.062  1.57  1.5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Freelin-Wade: Polyethylene catalog pages: LLDPE inch and metric, Liquiflex POE: OD, ID, wall, bend radius — web — Maker catalog; numbers only — https://www.freelin-wade.com/documents/catalogs/polyethylene-catalog-pages.pdf

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=polyethylene-tubing-lldpe-sizes