Steel I-Beams: W-Beams, S-Beams, Junior Beams & H-Piles
W-Beams, S-Beams, junior beams and H-piles in standard AISC sizes and ASTM grades, cut to length, drilled, coped and galvanized to your drawings, and delivered to your shop or job site.
Mona Steel supplies steel I-beams and H-piles to general contractors, fabricators, erectors, solar EPCs, OEMs and data center builders. Sizes follow the AISC designations, dimensions and tolerances follow ASTM A6, and mill test reports come with every order.
The four cards below compare W-Beams, S-Beams, junior beams and H-piles by flange, size, weight, grade and typical use. Each card links to the full AISC size table on that beam’s page.
Which beam do you need?
W-Beam (wide flange beam)
The building-frame standard, quoted in ASTM A992 or A572 Gr. 50.
- Flanges
- Parallel inner and outer flange faces
- Sizes
- W4 to W44, 289 AISC sizes
- Weights
- 8.5 to 925 lb/ft
- Typical uses
- Beams and columns in building frames, equipment platforms and dunnage, solar W-Beam piles
S-Beam (American Standard beam)
Narrow-flange I-beams, quoted in ASTM A36 or A572 Gr. 50.
- Flanges
- Narrow flanges with inner faces sloped at 16-2/3%
- Sizes
- S3 to S24, 28 AISC sizes
- Weights
- 5.7 to 121 lb/ft
- Typical uses
- Monorail and hoist beams, and repairs or additions that match existing S-Beams
Junior beam (M designations)
Light I-sections, quoted in ASTM A36 or A572 Gr. 50.
- Flanges
- Parallel flange faces on every size except M5×18.9, which has sloped flanges
- Sizes
- M3 to M12.5, 16 AISC sizes
- Weights
- 2.9 to 18.9 lb/ft
- Typical uses
- Light framing, equipment frames and supports
H-pile (HP bearing pile)
Bearing-pile sections; A572 Gr. 50 is commonly specified, A588 on request.
- Flanges
- Parallel flange faces; web and flanges about the same thickness
- Sizes
- HP8 to HP18, 22 AISC sizes
- Weights
- 36 to 204 lb/ft
- Typical uses
- Driven bearing piles for building and bridge foundations, soldier piles for shoring
Find a size
Type any W, S, M or HP designation to jump to its row in that beam’s size table. C, MC and angle sizes work too, and every row has a “Quote” link.
Dimensions and nominal weights from the AISC Shapes Database v16.0, for reference only. Confirm the section with your engineer; availability is confirmed on the quote.
What people mean by “I-beam”
“I-beam” is a trade name, not an AISC designation, and buyers use it for two different products. Size charts often use it for the W-Beam (wide flange beam), whose inner and outer flange faces are parallel. Many suppliers use it for the S-Beam, the American Standard beam, whose inner flange faces slope at 16-2/3%.
“H-beam” usually means a W-Beam with flanges about as wide as the section is deep, or an H-pile (HP bearing pile). Junior beams are the light M designations. The letter on the drawing settles it: W, S, M or HP.
Confirm the designation before you order. W8×31 and S8×18.4 are both 8 in. deep, but the W-Beam has 8 in. flanges at 31 lb/ft and the S-Beam has 4 in. flanges at 18.4 lb/ft.
Grades and standards by shape
Order the grade your drawings or project specification call for. These are the grades we quote for each beam family, and other grades are available on request.
The W-Beams page explains how A992 differs from A572 Grade 50, and our A36 vs. A572 Grade 50 guide compares those two grades.
- W-Beams: ASTM A992, the standard for building construction, or A572 Grade 50
- S-Beams: ASTM A36 or A572 Grade 50
- Junior beams: ASTM A36 or A572 Grade 50
- H-piles: A572 Grade 50 is commonly specified; A588 weathering steel on request
- Dimensions and tolerances for all four: ASTM A6
- Hot-dip galvanizing: ASTM A123
Processing before delivery
Order beams in random lengths, or have them processed before they ship so they arrive ready for fit-up.
If you have structural drawings but no shop drawings, our detailing team can prepare shop drawings and a cut list before any steel is cut.
- Cut to length and mitered
- Drilled, coped and punched
- Holes, slots and copes laser or plasma cut
- Hot-dip galvanized per ASTM A123
- Bundled and tagged by piece mark
- Mill test reports and heat-number traceability with every order
Availability and alternatives
The size tables list the standard AISC designations Mona Steel supplies and quotes. Availability, lengths and lead time are confirmed on the quote.
Some S, M and HP sizes are rolled infrequently. If the size on your drawing is hard to source, we can quote the nearest alternative section for your engineer to review before anything is ordered.
Where we deliver
Mona Steel is headquartered in Anaheim. We deliver across California and ship to job sites in Texas, Arizona, Nevada and nationwide, quoted per load.
Beams go to your shop, your erector or the job site. We don’t erect steel; erection stays with your erector.
Steel Beams FAQ
Is an I-beam the same as a W-Beam?
Not always. “I-beam” is a trade name that can mean a W-Beam (wide flange beam), with parallel flange faces, or an S-Beam (American Standard beam), with sloped inner flange faces. Order by the letter in the designation, not by the name.
What is the difference between W-Beams, S-Beams, junior beams and H-piles?
W-Beams have parallel flange faces and run from W4 to W44, for beams and columns in building frames. S-Beams have narrower flanges with sloped inner faces, and junior beams (M designations) are light sections for light framing. H-piles have a web and flanges of about the same thickness and are driven as bearing piles.
How do I read a beam size like W14×90?
The letters name the shape, the first number is the nominal depth in inches and the second is the weight in lb/ft: W14×90 is a W-Beam of 14 in. nominal depth at 90 lb/ft. The nominal depth is a label, not a measurement, so take clearances from the actual depth in the size table. The W-Beams page shows how far the two can differ.
Which grade should I order: A992, A572 Grade 50 or A36?
The grade on your drawings or project specification. W-Beams are normally A992, with A572 Grade 50 also available. S-Beams and junior beams are quoted in A36 or A572 Grade 50, A572 Grade 50 is commonly specified for H-piles, and other grades are available on request.
Can you cut beams to length and deliver to my job site?
Yes. Beams can be cut to length, drilled, coped, punched and hot-dip galvanized per ASTM A123, then bundled and tagged by piece mark. They go to your shop or job site, with delivery quoted per load.
What should I send to get a beam quote?
Send the designation, grade, piece count and lengths, any holes, copes or galvanizing, the delivery ZIP code and the date you need the steel. A cut list, takeoff or shop drawings work just as well.
Request a quote
Request pricing on steel beams
Send the sizes, grades, quantities and lengths, or upload your cut list or takeoff. We come back with an itemized quote, mill test reports included with the order.
- DXF
- DWG
- STEP
- XLS/CSV