Steel form parts guide
Plan straight runs, curves, corners and fillers.
Straight forms hold straight lines. Flex forms make curves. Corners turn the layout. Fillers close odd lengths. The connections and pins make those pieces work together.
Use the live Ohio Metal Forms catalog for current dimensions, fit, availability, and price.
Short answer
Draw the form line first. Label straight runs, curves, 90-degree turns and odd-length closeouts. Choose the OMF form height and check every connection direction. List required pins and jobsite hardware separately; they are not automatically included. Do not order by total feet alone.
- 1Trace the line
- 2Name each piece
- 3Match height
- 4Add connections
- 5Trial assemble
1. Give every part one clear job
On smaller screens, scroll horizontally to review every column.
| Part | What it does | Common ordering miss |
|---|---|---|
| Straight form | Holds a straight flatwork edge | Counting curve footage as straight |
| Flexible form | Follows a planned radius or smooth free curve | Assuming any tight bend is possible |
| OMF 90-degree corner | Connects to the female end of a matching-height OMF straight section | Assuming separate inside/outside OMF corner products or overlooking the connection direction |
| Filler | Overlaps a straight form to close an odd run | Treating it as a free-standing five-foot section |
| Pins and other jobsite hardware | Must be selected for the actual form and setup | Assuming pins are included, sold by OMF, or interchangeable with old hardware |
2. Mark the plan before counting parts
- Color the straights: Use one color and write the required form height beside each run.
- Color the curves: Use a second color and count inside and outside arcs separately.
- Circle every turn: Mark the concrete side and connection direction. Inside/outside is a plan description, not an OMF variant choice.
- Box odd closeouts: Show the full form under every planned filler overlap.
- Number the joints: Give mixed-system and transition joints an ID that can be checked in the field.
3. Match height and connection—not just length
Two pieces can both be ten feet long and still fail to join. Compare the face height, top and bottom rails, end connection, pocket style, pin size, and the way adjacent faces line up.
Keep a sample of the actual connection when ordering additions to an older inventory. Photos help, but measurements and a trial assembly are better. If brands are mixed, treat every joint as unproven until checked.
4. Pack by pour, height, and part type
- Bundle straight forms by height. Put the pour or edge IDs on the tag.
- Keep flex forms protected. Do not bury them under a mixed load where they can be damaged or mistaken for straights.
- Box small hardware. Count corners, locks, pins, and specialty pieces into labeled containers.
- Carry the marked plan. The crew should know where every odd piece belongs before spreading the load across the site.
Questions contractors ask
Can flexible forms be used for straight concrete work?
A flexible form is built for curve work. Use the product maker's guidance and the job requirements; do not assume it provides the same straightness and support as the matching straight form.
Does OMF sell separate inside and outside concrete form corners?
The current OMF listing has one 90-degree corner variant for each matching straight-form height. It fits the female end of the straight section. Inside and outside describe the plan turn; send the layout if the connection direction is unclear.
Are pins included with steel concrete forms?
Do not assume so. Ohio Metal Forms treats quantity as individual pieces, and jobsite hardware is not automatically added unless the current order explicitly lists it.
AI-assisted editorial review on September 5, 2026 checked this guide against existing Ohio Metal Forms product information and the sources below. Examples are planning exercises, not reported customer jobs. No new shop measurements or performance claims are presented.
Sources and scope
We used the following sources for general formwork and flatwork principles. Product dimensions and fit statements on this page refer specifically to the current Ohio Metal Forms catalog.
- Ohio Metal Forms, Concrete Form Size Guide — existing OMF product guidance for section lengths, piece quantities, matching heights and hardware scope
- Ohio Metal Forms, Form Corner — OMF lists a matching-height 90-degree corner for the female end of its straight form, not separate inside/outside variants
- Ohio Metal Forms, Five-Foot Filler Form — OMF filler slides over matching-height straight forms; the overlap and direction require layout review
This guide is planning information, not a project design, engineering judgment, safety plan, code interpretation, or substitute for the contract documents. The contractor remains responsible for means, methods, site conditions, competent-person review, and applicable requirements.