Flexible metal conduit sizes: FMC (reduced-wall 'greenfield') and liquid-tight LFMC, 3/8 to 4 in: ID and OD ranges, metric designators

sizes

35 in table

Notes

• Flexible metal conduit comes in electrical trade sizes (3/8, 1/2, 3/4, 1 ... 4 in) with metric designators 12, 16, 21, 27, 35, 41, 53, 63, 78, 91 (as printed by Anamet for 3/8 to 3-1/2 in). The ID and OD are printed as ranges (min–max), not nominal values, so nothing is averaged to a single value; 1/2 in FMC is ID 0.625–0.645 in and OD 0.860–0.920 in; 1/2 in LFMC (Type EF) is ID 0.620–0.640 in and OD 0.820–0.840 in. Ranges are in inches.
• FMC (also called greenfield, flex, or 'reduced-wall' flex, RWS) is steel flexible conduit without a jacket (Electri-Flex calls its Type BR 'non-jacketed'). Anamet's Type RWS page (10 of its 28 items shown in the text read, 3/8 to 3-1/2 in) and Electri-Flex's Type BR sheet print the same ID and OD ranges at every size they share; the exceptions are written as the sources print them: at 2 in the upper OD limit is 2.450 (Anamet) or 2.454 (Electri-Flex); at 2-1/2, 3 and 3-1/2 in Anamet prints the ID as a single value (2.500, 3.000, 3.500 in, the metric half of the cell reads 0.000 mm in the text, which is a page error) while Electri-Flex prints 2.500–2.700, 3.000–3.200 and 3.500 (min only). Electri-Flex's text was garbled when read; the pairs were assigned as the smaller = ID, larger = OD, which is how the sizes order.
• LFMC (liquid-tight, 'Sealtite'-type) is metal conduit with a PVC jacket. Type EF (general construction) and Type MTC (machine tool) are listed 3/8 to 2 in with ID and OD ranges; the 3/8 in Type HFL page prints the same range as Type EF (ID 0.485–0.505, OD 0.690–0.710 in). Larger LFMC sizes (2-1/2 to 4 in) were not in the sheets read. Bend radius is shown only for Electri-Flex's Type BR (its 'inside radius' column, inches as printed); Anamet's sheets print an 'electrical bend radius' per size that is not copied.
• EMT, rigid and IMC steel conduit tables are on emt-conduit and rigid-imc-emt-conduit-sizes-to-4-in; PVC conduit is on pvc-rigid-conduit-sch-40-80-nema-tc-2; knockouts and locknuts on conduit-knockout-diameters-nema-bulletin-71. No files: flexible conduit has no fixed shape.

Flexible metal conduit sizes: FMC (reduced-wall 'greenfield') and… size chart

Where the files are

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

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.

Plain text: sheet.txt · JSON: /api/geometry?object=flexible-metal-conduit-fmc-lfmc-trade-sizes

Fits with

Free

EMT conduit sizes: 1/2 to 2 in OD and wall (ANSI C80.3)6 sizes★ 24 filesFree

Rigid (RMC), IMC and EMT conduit sizes to 4 in: outside diameter, wall and inside diameter by trade size, inches and mm26 sizes★ sheetFree

PVC rigid conduit Schedule 40 and Schedule 80 (NEMA TC 2 / UL 651): trade size, OD, minimum wall, minimum average ID, 1/2 to 8 in + 100 mm sections168.27×168.27×100.0 mm★ 16 filesFree

Conduit knockout diameters (NEMA Bulletin 71): 1/2 to 6 in trade sizes, minimum, nominal and maximum, with bushing and locknut diameters + hole gauge plates298.5×78.7×3.0 mm★ 3 filesFree

US metal handy box and 4 in square box: size, depth, cubic inches, cover ears10 sizes★ sheetFree

U-bolts by pipe size: thread, inside diameter, inside width and thread length for 1/2 to 6 in pipe and 1 to 3 in square tube18 sizes★ sheet