A modular 2' x 3' cast iron fixture table. Starting at $775.
Every accurate weldment starts with a flat, square reference. The ArcFlat is a modular welding, fabrication, and fixture table made from nodular cast iron, with all five surfaces CNC machined and a top held to ±0.0075" flatness. Its 2" x 2" hole pattern accepts standard 5/8" and 16mm clamps, and each 36" x 24" block supports 1,000 lb static. ArcFlat blocks bolt together, so your table grows with your shop.
Use the interactive Product Configurator to choose from 18 layouts that fit your fabrication space and workflow, or build your own combination. Not sure which welding table is right for you? Compare cast iron, tab-and-slot, and welded steel tables.
Enter the size of the part you build the most and see the smallest ArcFlat layout that holds it, drawn to scale on the 2" hole grid.
Pins and clamps are for representation only and not a fixture plan.
Choose how many blocks you need and a layout. We add the leg kits and Precision Bolt Kits that layout needs, and you can add accessories before checkout.
1. Number of blocks Each block is 36" × 24"
Need more than 7 blocks? Contact support about freight shipping.
2. Layout
3. Leg kits
Corner legs Bolt kits and support legs
4. Accessories Optional
Fixture packages
Layout blocks need the 0.625" Layout Pin (8 Pack).
5/8" Layout Pin$19.95
4" x 1" x 1" Layout Block$21.95
4" x 1" x 2" Layout Block$24.95
6" x 1" x 2" Layout Block$29.95
ArcFlat Magnetic 1-2-3 Block$39.95
5" x 5" Angle Square$44.95
10" x 10" Angle Square$99.95
3" Straight Stop$15.95
4" Straight Stop – Slotted$17.95
6" Straight Stop – SL3H$18.95
10" Straight Stop – 4S5H$24.95
15" Straight Stop – 4S10H$32.95
Your ArcFlat
Plus ground shipping per block to the contiguous USA. Ships in 2-3 business days. Full refund, minus a 2.4% transaction fee, until your order ships.
Essential Starter Kit
11 essential fixturing tools (29 pieces), including layout pins, fixture clamps, magnetic 1-2-3 blocks, and layout blocks. Everything you need to start fixturing on your ArcFlat.
Specialty Builder Kit
25 fixturing tools (43 pieces): everything in the Essential Starter Kit, plus angle squares, modular angles, straight stops, and a V-block for repeat parts and complex setups.
| Specification | Detail |
|---|---|
| Dimensions | 36" length x 24" width x 4" height |
| Surface Flatness | ±0.0075" |
| Edge Perpendicularity | ±0.1 degrees |
| Static Load Capacity | 1,000 lb |
| Gross Weight | 145 lb |
| Hole Size | 0.630" +0.010" -0.005" |
| Hole Pattern | 2" x 2" grid |
| Thickness | Topside 3/8", Sidewall 5/16" |
| Material Grade | Nodular Cast Iron |
How a pre-machined cast iron table compares to building your own welding table.
| ArcFlat | Tab-and-Slot Kit | Welded Steel | |
|---|---|---|---|
| Surface flatness | Machined to ±0.0075" | Depends on assembly and welding skill | Depends on fabrication skill and warping |
| Assembly | None (bolt-on legs) | Hours of clamping, tacking, and welding | Cutting, squaring, fitting, and welding from scratch |
| Warp risk | None | Moderate to high | High |
| Clamp compatibility | Standard 5/8" and 16mm clamps | Usually 5/8" or 16mm, varies by kit | Edge clamps only, unless drilled |
| Upfront cost | $775 per block | Lower upfront, plus your build time | Lowest material cost, highest time cost |
Size your table for the parts you build most often, with room around them for clamps. Because ArcFlat blocks bolt together, you can start with one and grow.
Fits brackets, small frames, jigs, and bench-size parts. A good starting point for a garage or a first fixture table.
Bolt two blocks end to end for long parts like rails and trailer tongues, or side by side for a deeper surface for frames and gates.
Build larger surfaces for chassis, gates, and long assemblies. The configurator offers 18 layouts, or you can build your own.
Use one Precision Bolt Kit per joint to hold ±0.0075" flatness across adjoining blocks. Standard 1/2" bolts work, but won't hold that rating.
A fixture table is only as useful as the clamps you put in it. Here's what to know before you buy.
ArcFlat's 0.630" holes accept many standard 5/8" and 16mm clamps. Check with the manufacturer of any third-party tooling to confirm fit.
The Essential Starter Kit includes layout pins, fixture clamps, magnetic 1-2-3 blocks, and layout blocks, enough to cover most fit-up jobs.
The Specialty Builder Kit adds angle squares, modular angles, stops, and a V-block for repeat parts and more complex setups.
Tooling holes on all four machined sides let you clamp vertically, build up off the edge, or bolt blocks together.
Each 36" x 24" ArcFlat block is $775. The Leg Kit is $95 and the leveling bolt kit is $35, both sold separately. Fixture packages are available to get you clamping right away.
It depends on your work. Cast iron can be machined very flat, resists warping, and sheds spatter well, which makes it ideal for precision fixturing. Steel is tougher under hard impacts and costs less upfront, but it's harder to keep flat once welded. See the full welding table comparison.
Size it for your typical part, plus room for clamps and fixtures around it. A single 36" x 24" block suits brackets, small frames, and bench work. Bolting blocks together creates larger surfaces for chassis, gates, and long assemblies.
Each ArcFlat block has a static load capacity of 1,000 lb. The block itself weighs 145 lb.
ArcFlat ships UPS Ground, so blocks don't need freight service. If you're ordering a large quantity of ArcFlat blocks, contact Support about freight shipping options.
No. Because of its weight, ArcFlat ships only within the contiguous United States.
No. The ArcFlat is machined from a solid block of cast iron and no assembly is required.
The Leg Kit ($95) is an entry-level option that includes four 3" x 3" steel tube legs with basic leveling feet and hardware. Some customers prefer to build a custom support structure, which is why we sell the ArcFlat block separately. The ArcFlat bolt pattern is in the Specifications above to help you build your own.
Click here to learn more about typical cosmetic defects you may encounter.
Many will. ArcFlat fixture holes are machined to 0.630" (+0.010" / -0.005"). Check with the manufacturer of your third-party clamps and tooling to confirm they're compatible.
Weld blocks can be joined with standard 1/2" bolts; however, the ±0.0075” flatness rating can only be maintained across the entire surface of two adjoining weld blocks using the Precision Bolt Kit. Learn more about the ArcFlat Precision Bolt Kit here. One precision bolt kit is required for each joint.
Please see our Warranty, Refund, and Return Policy for full details on warranties, returns, and refunds.
All products sold directly by Langmuir Systems are eligible for return and refund. The terms of the return and refund policy are listed below:
