Xem Studiomeasured geometry

Library › Tri-clamp & pipe › Pipe, tube & threads ·

PTFE, FEP, PFA and ETFE fluoropolymer tubing: fractional sizes by ID, wall (standard, thin, lightweight) and industrial-spec ID × OD, 1/16 to 1/2 in

What are the ID, OD and wall of 1/4 inch PTFE tubing (standard wall, thin wall, industrial spec)? · Standard part · basis: Zeus Industrial Products' extruded tubing datasheet (fractional sizes, one maker); numbers only

Also called: 1/4 ptfe tubing id od, 1/4 inch ptfe tube wall thickness, 1/8 ptfe tubing id, ptfe tubing 3/8 id 0.387, thin wall ptfe tubing 1/4 id, lightweight wall ptfe tube, teflon tubing 1/2 id od, ptfe tubing industrial spec, 1/16 id ptfe tubing od 1/8, ptfe tube sizes chart inch, 5/16 ptfe tubing id, 3/16 ptfe tube od, fep tube 1/4 id wall .020

Exact dimensions. True size, with no tolerance added.

sizes
21 in table

Notes

  • Zeus' datasheet gives the fluoropolymer tubing family (ETFE, FEP, PFA, PTFE) one set of fractional sizes; the page does not break out PTFE alone, so these are sizes in which PTFE tube is made, not a PTFE-only table. Standard-wall and thin-wall tubing are sized by nominal ID: 1/8 in 0.125 (range 0.120–0.130), 3/16 in 0.192 (0.188–0.198), 1/4 in 0.255 (0.250–0.260), 5/16 in 0.321 (0.313–0.332), 3/8 in 0.387 (0.375–0.394), 1/2 in 0.515 (0.500–0.520 in). The ID-by-size table prints a 1/8 row twice (0.120 / 0.125 / 0.130 and 0.125 / 0.130 / 0.135) and the wall table also has two 1/8 rows, but the datasheet does not label which is which; both are shown, in the datasheet's order, without pairing them.
  • Wall (nominal ± tolerance, in), per size: 1/8 in standard 0.020 ±0.004, thin 0.015 ±0.003 (and a lightweight 0.008 ±0.002 row); 3/16 in 0.020 / 0.015 / lightweight 0.010; 1/4 in 0.020 / 0.015 / lightweight 0.010; 5/16 in 0.020 / 0.015 / lightweight 0.012; 3/8 in 0.025 / 0.015 / lightweight 0.015; 1/2 in 0.025 / 0.018 / lightweight 0.018. The datasheet does not print the OD for these; adding 2 × wall to the ID is arithmetic left to the reader, and the nominal ID is not a design dimension within its range.
  • 'Industrial specification tubing' is sized differently and the datasheet prints ID and OD together: 1/16 in 0.063 × 0.125, 1/8 in 0.125 × 0.188, 3/16 in 0.188 × 0.250, 1/4 in 0.250 × 0.313, 5/16 in 0.313 × 0.375, 3/8 in 0.375 × 0.438, 1/2 in 0.500 × 0.563 in (tolerance ±0.005 in, ±0.006 in for 1/2 in; in mm 1.60 × 3.18 up to 12.70 × 14.30). The wall is printed as 0.30 in in the inch column but 0.76 mm in the mm column, and (OD − ID) ÷ 2 is 0.031 in, so 0.76 mm (about 0.030 in) is the number used; the inch printing '0.30' is a typo in the datasheet.
  • AWG-sized fluoropolymer tubing (catalog sizes by wire gauge) exists in the same catalog but its table was not read cleanly and is not on this page. Pressure, temperature and chemical data are not copied. Related tubing: nylon-tubing-inch-metric-sizes, tygon-vinyl-tubing-e-3603-sizes, polyethylene-tubing-lldpe-sizes. No files: tubing is not drawn as a fixed shape.

PTFE, FEP, PFA and ETFE fluoropolymer tubing: fractional sizes by… size chart

tablenominal sizeID, in (min / nominal / max or ID ± tol.)ID, mmwall or ODwall mm / note
Fractional size by ID (min / nominal / max)1/80.120 / 0.125 / 0.1303.05 / 3.18 / 3.30——
Fractional size by ID (min / nominal / max)1/80.125 / 0.130 / 0.1353.18 / 3.30 / 3.43——
Fractional size by ID (min / nominal / max)3/160.188 / 0.192 / 0.1984.78 / 4.88 / 5.03——
Fractional size by ID (min / nominal / max)1/40.250 / 0.255 / 0.2606.35 / 6.48 / 6.60——
Fractional size by ID (min / nominal / max)5/160.313 / 0.321 / 0.3327.95 / 8.15 / 8.43——
Fractional size by ID (min / nominal / max)3/80.375 / 0.387 / 0.3949.53 / 9.83 / 10.01——
Fractional size by ID (min / nominal / max)1/20.500 / 0.515 / 0.52012.70 / 13.08 / 13.21——
Wall, nominal ± tolerance (in)1/8——standard 0.020 ±0.004 (0.51 mm); thin 0.015 ±0.003 (0.38 mm)—
Wall, nominal ± tolerance (in)1/8——lightweight 0.008 ±0.002 (0.20 mm)—
Wall, nominal ± tolerance (in)3/16——standard 0.020 ±0.004 (0.51 mm); thin 0.015 ±0.003 (0.38 mm); lightweight 0.010 ±0.003 (0.25 mm)—
Wall, nominal ± tolerance (in)1/4——standard 0.020 ±0.004 (0.51 mm); thin 0.015 ±0.003 (0.38 mm); lightweight 0.010 ±0.003 (0.25 mm)—
Wall, nominal ± tolerance (in)5/16——standard 0.020 ±0.004 (0.51 mm); thin 0.015 ±0.003 (0.38 mm); lightweight 0.012 ±0.003 (0.30 mm)—
Wall, nominal ± tolerance (in)3/8——standard 0.025 ±0.005 (0.64 mm); thin 0.015 ±0.003 (0.38 mm); lightweight 0.015 ±0.005 (0.38 mm)—
Wall, nominal ± tolerance (in)1/2——standard 0.025 ±0.005 (0.64 mm); thin 0.018 ±0.004 (0.46 mm); lightweight 0.018 ±0.005 (0.46 mm)—
Industrial specification tubing1/160.063 ±0.0051.60 ±0.13OD 0.125 ±0.005 in (3.18 ±0.13 mm)0.76 mm (printed; the inch column prints '0.30')
Industrial specification tubing1/80.125 ±0.0053.18 ±0.13OD 0.188 ±0.005 in (4.78 ±0.13 mm)0.76 mm (printed; the inch column prints '0.30')
Industrial specification tubing3/160.188 ±0.0054.78 ±0.13OD 0.250 ±0.005 in (6.35 ±0.13 mm)0.76 mm (printed; the inch column prints '0.30')
Industrial specification tubing1/40.250 ±0.0056.35 ±0.13OD 0.313 ±0.005 in (7.95 ±0.13 mm)0.76 mm (printed; the inch column prints '0.30')
Industrial specification tubing5/160.313 ±0.0057.95 ±0.13OD 0.375 ±0.005 in (9.53 ±0.13 mm)0.76 mm (printed; the inch column prints '0.30')
Industrial specification tubing3/80.375 ±0.0059.53 ±0.13OD 0.438 ±0.005 in (11.13 ±0.13 mm)0.76 mm (printed; the inch column prints '0.30')
Industrial specification tubing1/20.500 ±0.00612.70 ±0.15OD 0.563 ±0.006 in (14.30 ±0.15 mm)0.76 mm (printed; the inch column prints '0.30')

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Zeus Industrial ProductsExtruded tubing (V2R4): fractional sizes by ID, wall dimensions (standard, thin, lightweight) and industrial-specification tubing ID x ODwebMaker datasheet; numbers only

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=ptfe-fep-pfa-tubing-fractional-sizes

Schematic, not to scale.

Fits with

Nylon tubing sizes: inch (1/8 to 5/8 in OD) and metric (3 to 12 mm) OD × ID × wall, standard, D.O.T. and high-pressure nylon 1133 sizes★ sheet
Tygon vinyl tubing (E-3603 / S3 E-3603): ID × OD × wall, 1/32 to 1 in ID, 1/16 to 1/4 in walls31 sizes★ sheet
Polyethylene tubing sizes (LLDPE): 1/8 to 3/4 in and 4 to 12 mm OD × ID × wall, plus Liquiflex POE16 sizes★ sheet
Silicone tube 1 × 3 to 10 × 14 mm (ID × OD), isometric render of a generated part
Silicone tube 1 × 3 to 10 × 14 mm (ID × OD)8 sizes★ 11 files
Capricorn XS PTFE Bowden tubing (1.75 mm filament), isometric render of a generated part
Capricorn XS PTFE Bowden tubing (1.75 mm filament)3.95×3.95×100 mm★ 1 file
length
Push-to-connect pneumatic fittings: tube OD 4 to 12 mm and 1/8 to 1/2 in with the thread sizes offered12 sizes★ sheet
AN and JIC 37° flare fittings: dash sizes -3 to -20, thread, tube OD, hose ID, flare diameter9 sizes★ sheet

Questions

What is the OD of 1/4 inch ID PTFE tubing?

In Zeus' industrial-specification tubing, 1/4 in ID (0.250 ±0.005) has an OD of 0.313 ±0.005 in (7.95 mm), wall 0.76 mm. Standard and thin wall sizes are given by ID and wall (0.020 / 0.015 in at 1/4 in); no OD is printed for them.

What wall is thin-wall PTFE tubing?

0.015 ±0.003 in (0.38 mm) for 1/8 to 3/8 in ID, 0.018 ±0.004 in (0.46 mm) at 1/2 in, in Zeus' table.

What is the nominal ID of '1/4 inch' PTFE tubing?

0.255 in (6.48 mm), range 0.250–0.260 in, for standard and thin wall.