Dimensions
| Parameter | Symbol | Value | Unit | US customary | Data |
|---|---|---|---|---|---|
| Depth | d | 457.2 | mm | 18.000 in | U |
| Flange width | bf | 190.5 | mm | 7.500 in | U |
| Flange thickness | tf | 14.5 | mm | 0.570 in | U |
| Web thickness | tw | 9.0 | mm | 0.355 in | U |
| Root radius | r1 | 10.2 | mm | 0.402 in | U |
Section Properties
| Parameter | Symbol | Value | Unit | US customary | Data |
|---|---|---|---|---|---|
| General | |||||
| Mass per metre | mass | 74.32 | kg/m | 49.94 lb/ft | C |
| Gross area | A | 9,467 | mm² | 14.67 in² | C |
| About x-axis (major) | |||||
| Second moment of area Ix | Ix | 333.431 | 10⁶ mm⁴ | 801.1 in⁴ | C |
| Elastic section modulus Zx (min) | Zx | 1,458.6 | 10³ mm³ | 89.01 in³ | C |
| Plastic section modulus Sx | Sx | 1,653.5 | 10³ mm³ | 100.90 in³ | C |
| Radius of gyration rx | rx | 187.7 | mm | 7.388 in | C |
| About y-axis (minor) | |||||
| Second moment of area Iy | Iy | 16.712 | 10⁶ mm⁴ | 40.2 in⁴ | C |
| Elastic section modulus Zy (min) | Zy | 175.5 | 10³ mm³ | 10.71 in³ | C |
| Plastic section modulus Sy | Sy | 272.0 | 10³ mm³ | 16.60 in³ | C |
| Radius of gyration ry | ry | 42.0 | mm | 1.654 in | C |
| Torsion & warping | |||||
| Torsion constant JApproximate thin-walled value, fillets neglected | J | 0.490 | 10⁶ mm⁴ | 1.2 in⁴ | C |
| Warping constant IwIy·(d−tf)²/4 | Iw | 818.92 | 10⁹ mm⁶ | 3,050 in⁶ | C |
| Surface area | |||||
| External surface area | extArea | 1.641 | m²/m | 5.383 ft²/ft | C |
Nominal designation mass 74.41 kg/m; calculated 74.32 kg/m (-0.1%).
Steel Grades
| Grade | Standard | fy MPa | fu MPa | Note | Data |
|---|---|---|---|---|---|
| A992 (50 ksi) | ASTM A992/A992M | 345 | 450 | Preferred grade for W-shapes (AISC) | U |
Strengths shown for governing thickness t = 14.5 mm. Density 7850 kg/m³, E = 200 000 MPa.
Where to buy
Producers of Hot-rolled beams & columns (I / H / W) – local mills first. Buy direct from the mill for large tonnages, or through a steel distributor / stockist for small quantities and cut lengths.
Local producer
Standards: ASTM A6, ASTM A992
Local producer
Standards: ASTM A6, ASTM A992
Local producer
Standards: ASTM A6, ASTM A992
Supplies this market
Standards: EN 10365, EN 10025, ASTM A6
International producer
Standards: EN 10365, BS 4-1, EN 10025
International producer
Standards: EN 10365, EN 10025
Buying checklist
- Specify the section designation, product standard and steel grade exactly (e.g. "W18x50 – ASTM A6/A6M – A992 (50 ksi)").
- Ask for mill test certificates (EN 10204 type 3.1 or equivalent) traceable to the heat number.
- Sections from another standard system are not automatically equivalent – have the engineer approve any substitution.
- Check availability, minimum order quantity, stock lengths, lead time and delivery terms with the mill or distributor.
All producers of this product type →
Listing is informational only – not an endorsement, offer or confirmation of availability. Company details are marked UNVERIFIED until checked.
Source & Verification
- Source publisher
- Pending verification – nominal dimensions entered by the application developer
- Source document
- ASTM A6/A6M and AISC Shapes Database (W-shapes)
- Edition
- —
- Publication year
- —
- Page reference
- —
- Last updated
- 2026-10-12
- Verification status
- Unverified
Dimensions converted from the inch values of the AISC shapes database (d, bf, tw, tf, kdes; root radius = kdes − tf). Nominal weight 50 lb/ft. Verify against ASTM A6/A6M and the AISC Steel Construction Manual before design use.