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Size chart · 121 inch sizes · all on existing dies · updated 2026-11-07

FRP size chart in inches

Fiberglass round and square tubes, rectangular tubes, solid and threaded rods, square bars, flat strips, angles, channels and I-beams, listed the way North American drawings call them: fractional inches first, then the decimal and millimetre equivalents, a calculated weight per foot and whether the die already exists.

Quote inch sizes

How to read the charts

True inch sections, all on dies we already have

Every size in these charts runs on a die already in our factory's die stock and is pultruded as a true inch section, not converted from the nearest metric size, so no tooling charge applies. A size not listed needs a die made and trialed first, quoted as a separate tooling line. Cut lengths, tolerances and the minimum run are stated in the quotation.

Calculated weight uses 1.9 g/cm³ (0.0686 lb/in³), the mid-point of the 1.8–2.0 g/cm³ density our factory states for its pultruded profiles, applied to the nominal section with square corners. Actual weight varies with glass content, resin, surface veil and corner radii, by roughly ±5 %. Use it for freight and handling estimates, not as an acceptance criterion.

Fiberglass round tube sizes

From 1/4 in OD small-bore tubes for antenna masts, kite and tool spars and telescoping tips up to 4 in OD in 1/8 in and 1/4 in walls, all on existing dies.

Fiberglass round tube sizes in inches with metric equivalents and calculated weight
OD × ID (in)Wall (in)Decimal OD × ID (in)Metric OD × ID (mm)lb/ftkg/mSleeves insideDie
1/4 × 9/640.0550.250 × 0.1416.35 × 3.570.0280.0411/2 × 1/4Existing die
5/16 × 9/640.0860.313 × 0.1417.94 × 3.570.0500.075None in chartExisting die
3/8 × 3/163/320.375 × 0.1889.53 × 4.760.0680.10None in chartExisting die
3/8 × 9/640.1170.375 × 0.1419.53 × 3.570.0780.12None in chartExisting die
1/2 × 1/41/80.500 × 0.25012.7 × 6.350.120.183/4 × 1/2Existing die
3/4 × 1/21/80.750 × 0.50019.05 × 12.70.200.301 × 3/4Existing die
1 × 3/41/81.000 × 0.75025.4 × 19.050.280.421-1/4 × 1Existing die
1-1/4 × 11/81.250 × 1.00031.75 × 25.40.360.541-1/2 × 1-1/4Existing die
1-1/2 × 1-1/41/81.500 × 1.25038.1 × 31.750.440.661-3/4 × 1-1/2Existing die
1-3/4 × 1-1/21/81.750 × 1.50044.45 × 38.10.530.782 × 1-3/4Existing die
2 × 1-3/41/82.000 × 1.75050.8 × 44.450.610.902-1/4 × 2Existing die
2-1/4 × 21/82.250 × 2.00057.15 × 50.80.691.022-1/2 × 2-1/4Existing die
2-1/2 × 2-1/41/82.500 × 2.25063.5 × 57.150.771.142-3/4 × 2-1/2Existing die
2-3/4 × 2-1/21/82.750 × 2.50069.85 × 63.50.851.263 × 2-3/4Existing die
3 × 2-3/41/83.000 × 2.75076.2 × 69.850.931.383-1/2 × 3Existing die
1 × 1/21/41.000 × 0.50025.4 × 12.70.490.721-1/4 × 1Existing die
1-1/4 × 3/41/41.250 × 0.75031.75 × 19.050.650.961-1/2 × 1-1/4Existing die
1-1/2 × 11/41.500 × 1.00038.1 × 25.40.811.201-3/4 × 1-1/2Existing die
1-3/4 × 1-1/41/41.750 × 1.25044.45 × 31.750.971.442 × 1-3/4Existing die
2 × 1-1/21/42.000 × 1.50050.8 × 38.11.131.682-1/4 × 2Existing die
2-1/2 × 21/42.500 × 2.00063.5 × 50.81.462.172-3/4 × 2-1/2Existing die
3 × 2-1/21/43.000 × 2.50076.2 × 63.51.782.653-1/2 × 3Existing die
3-1/2 × 31/43.500 × 3.00088.9 × 76.22.103.134 × 3-1/2Existing die
4 × 3-1/21/44.000 × 3.500101.6 × 88.92.433.61None in chartExisting die
  • In the 1/8 in wall series the bore of each tube equals the outside diameter of the next size down, from 1/4 in up to 3 in, so the sizes nest for telescoping poles and sleeved joints. Nominal sizes are line-to-line: state the sliding clearance or a press fit on the drawing and we size the bore tolerance to it.
  • “Sleeves inside” names the tube in this chart whose bore equals the outside diameter, across both wall series. A 1/4 in wall tube sleeves inside the 1/8 in wall tube one size up, which gives a doubled wall at a joint or a stiffer base section.

Order requirements for this shape

Fiberglass square tube sizes

1 × 1 in to 4 × 4 in in 1/8 in and 3/16 in walls, plus the heavy 2 × 2 × 1/4 in tube, all on existing dies.

Fiberglass square tube sizes in inches with metric equivalents and calculated weight
Side × side × wall (in)Metric (mm)Clear opening (in)lb/ftkg/mDie
1 × 1 × 1/825.4 × 25.4 × 3.180.7500.360.54Existing die
1-1/4 × 1-1/4 × 1/831.75 × 31.75 × 3.181.0000.460.69Existing die
1-1/2 × 1-1/2 × 1/838.1 × 38.1 × 3.181.2500.570.84Existing die
1-3/4 × 1-3/4 × 1/844.45 × 44.45 × 3.181.5000.671.00Existing die
2 × 2 × 1/850.8 × 50.8 × 3.181.7500.771.15Existing die
2-1/2 × 2-1/2 × 1/863.5 × 63.5 × 3.182.2500.981.46Existing die
3 × 3 × 1/876.2 × 76.2 × 3.182.7501.181.76Existing die
1-1/2 × 1-1/2 × 3/1638.1 × 38.1 × 4.761.1250.811.21Existing die
2 × 2 × 3/1650.8 × 50.8 × 4.761.6251.121.67Existing die
2-1/2 × 2-1/2 × 3/1663.5 × 63.5 × 4.762.1251.432.13Existing die
3 × 3 × 3/1676.2 × 76.2 × 4.762.6251.742.59Existing die
3-1/2 × 3-1/2 × 3/1688.9 × 88.9 × 4.763.1252.053.05Existing die
4 × 4 × 3/16101.6 × 101.6 × 4.763.6252.363.51Existing die
2 × 2 × 1/450.8 × 50.8 × 6.351.5001.442.15Existing die
  • Clear opening is outside side minus two walls, flat to flat. Internal corners carry a radius, so check a square insert against the corner, not only the flats.

Order requirements for this shape

Fiberglass rectangular tube sizes

All eight sections run on existing dies. Other width and height combinations between 1 and 4 in are quoted to drawing.

Fiberglass rectangular tube sizes in inches with metric equivalents and calculated weight
Width × height × wall (in)Metric (mm)Clear opening (in)lb/ftkg/mDie
1 × 2 × 1/825.4 × 50.8 × 3.180.750 × 1.7500.570.84Existing die
1 × 3 × 1/825.4 × 76.2 × 3.180.750 × 2.7500.771.15Existing die
1-1/2 × 2-1/2 × 1/838.1 × 63.5 × 3.181.250 × 2.2500.771.15Existing die
1-1/2 × 3 × 1/838.1 × 76.2 × 3.181.250 × 2.7500.881.30Existing die
2 × 3 × 1/850.8 × 76.2 × 3.181.750 × 2.7500.981.46Existing die
2 × 3 × 3/1650.8 × 76.2 × 4.761.625 × 2.6251.432.13Existing die
2 × 4 × 3/1650.8 × 101.6 × 4.761.625 × 3.6251.742.59Existing die
3 × 4 × 3/1676.2 × 101.6 × 4.762.625 × 3.6252.053.05Existing die
  • Mark which face is vertical in service. A 2 × 4 in tube installed on its side is a different member, and hole patterns refer to a named face.

Order requirements for this shape

Fiberglass round rod sizes

5/64 in to 1-3/4 in, all on existing dies; 2 in is quoted on request.

Fiberglass round rod sizes in inches with metric equivalents and calculated weight
Diameter (in)Decimal (in)Metric (mm)lb/ftkg/mDie
5/640.0781.980.0040.006Existing die
3/320.0942.380.0060.008Existing die
1/80.1253.180.0100.015Existing die
5/320.1563.970.0160.024Existing die
3/160.1884.760.0230.034Existing die
1/40.2506.350.0400.060Existing die
5/160.3137.940.0630.094Existing die
3/80.3759.530.0910.14Existing die
7/160.43811.110.120.18Existing die
1/20.50012.70.160.24Existing die
5/80.62515.880.250.38Existing die
3/40.75019.050.360.54Existing die
7/80.87522.230.500.74Existing die
11.00025.40.650.96Existing die
1-1/41.25031.751.011.50Existing die
1-1/21.50038.11.462.17Existing die
1-3/41.75044.451.982.95Existing die
  • Rods for flag poles, stakes and springs are ordered by their bending duty as well as their diameter. Tell us whether the rod must stay stiff or flex repeatedly.

Order requirements for this shape

Fiberglass threaded rod sizes

All-thread rod made from our pultruded round rod, with the thread formed after pultrusion. The rod dies exist; threading is a secondary operation priced in the quotation. Matching fiberglass nuts are quoted separately.

Fiberglass threaded rod sizes in inches with metric equivalents and calculated weight
Diameter × threads per inch (UNC)Decimal (in)Metric (mm)Threads per inchlb/ftkg/mDie
3/8-16 UNC0.3759.53160.0720.11Existing rod die
1/2-13 UNC0.50012.7130.130.19Existing rod die
5/8-11 UNC0.62515.88110.210.31Existing rod die
3/4-10 UNC0.75019.05100.300.45Existing rod die
1-8 UNC1.00025.480.550.81Existing rod die
  • Weight is calculated on the thread pitch diameter. Fiberglass threads carry far less load than steel threads of the same size: give the design load and torque so the thread length and nut engagement can be checked.

Order requirements for this shape

Fiberglass square bar sizes

3/16 in to 1-1/2 in, all on existing dies.

Fiberglass square bar sizes in inches with metric equivalents and calculated weight
Side (in)Decimal (in)Metric (mm)lb/ftkg/mDie
3/160.1884.760.0290.043Existing die
1/40.2506.350.0510.077Existing die
3/80.3759.530.120.17Existing die
1/20.50012.70.210.31Existing die
5/80.62515.880.320.48Existing die
3/40.75019.050.460.69Existing die
11.00025.40.821.23Existing die
1-1/41.25031.751.291.92Existing die
1-1/21.50038.11.852.76Existing die
  • Corner condition matters for keys and wear strips: state a sharp, radiused or chamfered edge.

Order requirements for this shape

Fiberglass flat strip and flat bar sizes

Sixteen strips from 1 × 1/8 in to 6 × 1/2 in, all on existing dies. Color and surface finish are set per order.

Fiberglass flat strip and flat bar sizes in inches with metric equivalents and calculated weight
Width × thickness (in)Decimal (in)Metric (mm)lb/ftkg/mDie
1 × 1/81.000 × 0.12525.4 × 3.180.100.15Existing die
1 × 1/41.000 × 0.25025.4 × 6.350.210.31Existing die
1-1/2 × 1/81.500 × 0.12538.1 × 3.180.150.23Existing die
1-1/2 × 1/41.500 × 0.25038.1 × 6.350.310.46Existing die
2 × 1/82.000 × 0.12550.8 × 3.180.210.31Existing die
2 × 3/162.000 × 0.18850.8 × 4.760.310.46Existing die
2 × 1/42.000 × 0.25050.8 × 6.350.410.61Existing die
2 × 1/22.000 × 0.50050.8 × 12.70.821.23Existing die
3 × 1/43.000 × 0.25076.2 × 6.350.620.92Existing die
3 × 3/83.000 × 0.37576.2 × 9.530.931.38Existing die
4 × 1/44.000 × 0.250101.6 × 6.350.821.23Existing die
4 × 3/84.000 × 0.375101.6 × 9.531.241.84Existing die
4 × 1/24.000 × 0.500101.6 × 12.71.652.45Existing die
6 × 1/46.000 × 0.250152.4 × 6.351.241.84Existing die
6 × 1/26.000 × 0.500152.4 × 12.72.473.68Existing die
1-1/4 × 3/161.250 × 0.18831.75 × 4.760.190.29Existing die
  • For wear strips, battens and spacers state flatness over the piece length and whether one or both faces carry a surface veil.

Order requirements for this shape

Fiberglass angle sizes

Equal-leg angles from 1 × 1 × 1/8 in to 6 × 6 × 3/4 in, all on existing dies, in polyester or vinyl ester resin, 120 in and 240 in lengths or cut to order. Unequal legs are quoted to drawing.

Fiberglass angle sizes in inches with metric equivalents and calculated weight
Leg × leg × thickness (in)Decimal (in)Metric (mm)lb/ftkg/mDie
1-1/2 × 1-1/2 × 1/41.500 × 1.500 × 0.25038.1 × 38.1 × 6.350.570.84Existing die
2 × 2 × 1/42.000 × 2.000 × 0.25050.8 × 50.8 × 6.350.771.15Existing die
3 × 3 × 1/43.000 × 3.000 × 0.25076.2 × 76.2 × 6.351.181.76Existing die
3 × 3 × 3/83.000 × 3.000 × 0.37576.2 × 76.2 × 9.531.742.59Existing die
3 × 3 × 1/23.000 × 3.000 × 0.50076.2 × 76.2 × 12.72.273.37Existing die
4 × 4 × 3/84.000 × 4.000 × 0.375101.6 × 101.6 × 9.532.363.51Existing die
4 × 4 × 1/24.000 × 4.000 × 0.500101.6 × 101.6 × 12.73.094.60Existing die
6 × 6 × 1/26.000 × 6.000 × 0.500152.4 × 152.4 × 12.74.747.05Existing die
6 × 6 × 5/86.000 × 6.000 × 0.625152.4 × 152.4 × 15.885.868.71Existing die
6 × 6 × 3/46.000 × 6.000 × 0.750152.4 × 152.4 × 19.056.9510.34Existing die
1 × 1 × 1/81.000 × 1.000 × 0.12525.4 × 25.4 × 3.180.190.29Existing die
2 × 2 × 3/162.000 × 2.000 × 0.18850.8 × 50.8 × 4.760.590.88Existing die
  • The root (inside corner) carries a radius. Show it on the drawing if a plate or another angle must sit tight into the corner.

Order requirements for this shape

Fiberglass channel sizes

Twelve channels from 1-1/2 in to 6 in deep, including a 1-5/8 × 1-5/8 in strut-size channel, all on existing dies; lengths 10–20 ft or cut to order.

Fiberglass channel sizes in inches with metric equivalents and calculated weight
Depth × flange × thickness (in)Decimal (in)Metric (mm)lb/ftkg/mDie
2 × 9/16 × 1/82.000 × 0.563 × 0.12550.8 × 14.29 × 3.180.300.44Existing die
2 × 1 × 1/82.000 × 1.000 × 0.12550.8 × 25.4 × 3.180.390.57Existing die
3 × 7/8 × 1/43.000 × 0.875 × 0.25076.2 × 22.23 × 6.350.881.30Existing die
3 × 1-1/2 × 1/43.000 × 1.500 × 0.25076.2 × 38.1 × 6.351.131.69Existing die
4 × 1-1/8 × 1/44.000 × 1.125 × 0.250101.6 × 28.58 × 6.351.181.76Existing die
4 × 1-1/2 × 1/44.000 × 1.500 × 0.250101.6 × 38.1 × 6.351.341.99Existing die
5 × 1-3/8 × 1/45.000 × 1.375 × 0.250127 × 34.93 × 6.351.492.22Existing die
6 × 1-5/8 × 1/46.000 × 1.625 × 0.250152.4 × 41.28 × 6.351.802.68Existing die
6 × 1-11/16 × 3/86.000 × 1.688 × 0.375152.4 × 42.86 × 9.532.663.96Existing die
1-1/2 × 13/16 × 3/161.500 × 0.813 × 0.18838.1 × 20.64 × 4.760.420.63Existing die
2-9/16 × 1-7/32 × 1/82.563 × 1.219 × 0.12565.09 × 30.96 × 3.180.490.73Existing die
1-5/8 × 1-5/8 × 1/8 (0.200 web)1.625 × 1.625 × 0.125 × 0.20041.28 × 41.28 × 3.18 × 5.080.560.84Existing die
  • Weights assume one thickness for web and flanges unless a web thickness is given. Many channels use a thicker web than flange: give both on the drawing and we quote that section.
  • The 1-5/8 in strut-size channel is a plain channel with a 0.200 in web. If your strut fittings need in-turned lips and a slotted back, send the fitting drawing.

Order requirements for this shape

Fiberglass I-beam sizes

Four I-beams from 3 in to 8 in deep on existing dies. Other depths and wide-flange sections are quoted to drawing.

Fiberglass I-beam sizes in inches with metric equivalents and calculated weight
Flange × depth × thickness (in)Decimal (in)Metric (mm)lb/ftkg/mDie
1-1/2 × 3 × 1/41.500 × 3.000 × 0.25038.1 × 76.2 × 6.351.131.69Existing die
2 × 4 × 1/42.000 × 4.000 × 0.25050.8 × 101.6 × 6.351.542.30Existing die
3 × 6 × 1/43.000 × 6.000 × 0.25076.2 × 152.4 × 6.352.373.52Existing die
4 × 8 × 3/84.000 × 8.000 × 0.375101.6 × 203.2 × 9.534.717.01Existing die
  • Beams are chosen by stiffness and connection details, not by size alone. Send span, supports and loads so the section can be checked before you order.

Order requirements for this shape

Ordering

What to send with an inch-size enquiry

  • Designation and units

    Write the size as it appears in the chart, for example 1-1/2 × 1/8 in round tube, and say whether the drawing is in inches or millimetres.

  • Lengths and quantities

    List each cut length with its quantity. Tell us if pieces must be packed in bundles of a fixed count.

  • Fit and tolerances

    For sleeves, inserts and fittings, name the mating part and the clearance you need. We set the tolerances to it.

  • Resin, color and surface

    Polyester, vinyl ester or polyurethane; color; and whether a surface veil is needed for outdoor or UV exposure.

  • Service conditions

    Loads, chemicals, temperature and electrical duty. They decide the resin and the tests we propose.

  • Machining

    Holes, slots, end caps or bonding. Show positions from a named end and face.

A size not listed here goes through the custom FRP profile route. The finished-profile RFQ checklist covers inspection and packing.

FAQ

Inch size questions

Are these sizes in stock?
No finished stock is held; every size is pultruded to order. Every listed size runs on an existing die, so the order goes straight to production planning without a tooling charge. The quotation states the minimum run, the tolerances and the lead time.
What if my size is not listed?
Send the drawing. A new die is made and trialed first and quoted as a separate tooling line; the trial samples are checked against your drawing before the production run.
Is threaded rod available?
Yes, 3/8-16 to 1-8 UNC all-thread is made from our pultruded round rod with the thread formed afterwards. Give the design load and torque, because fiberglass threads carry much less load than steel threads of the same size.
Can I order a metric size instead?
Yes. Send the size in millimetres. Do not substitute a 25 mm tube for a 1 in tube where parts must fit together: a 0.4 mm difference on the diameter is enough to stop a sleeve sliding or leave it loose.
Will two tubes from the 1/8 in wall series telescope?
Nominally the bore of each tube equals the outside diameter of the next size down, so the sizes nest line to line. For a sliding fit, put the clearance on the drawing; we set the bore and outside diameter tolerances to it and check the fit on samples.
How accurate are the lb/ft weights?
They are calculated from the nominal section at 1.9 g/cm³ and ignore corner radii, so expect roughly ±5 % on delivered pieces. Use them for freight and handling estimates; the packing list gives the weighed figure.
What lengths can I order?
Cut to length. State lengths in feet and inches or millimetres together with the quantity for each length. The quotation confirms the longest single piece for the section and the container.

Send a cross-section drawing. Get a scoped quotation.

Every quotation names the manufacturer, the exporter of record and the warranty party, and lists what is included.

Request an inch-size quotation All FRP profile families