Cut, drilled and welded base assemblies matched to the anchor layout
We fabricate steel column base plates as loose drilled parts or column-attached assemblies. The released base detail coordinates plate size and thickness, anchor-hole positions, column orientation and any specified stiffeners or shear lug. Our quotation keeps those fabrication details, finish conditions and required records with the identified column-base reference.
| Supply format | Loose drilled plate or column-attached base assembly |
|---|---|
| Plate | Selected material, plan dimensions and thickness |
| Anchor interface | Hole pattern and diameters from the released anchor layout |
| Attachments | Specified stiffeners, column welds and shear-lug detail |
| Bearing interface | Drawing-defined face condition, leveling and grout provisions |
| Finish | Required coating, reserved surfaces and acceptance records |
The AISC-published 2024 plate-washer study reproduces the 15th-edition Manual Table 14-2 recommendations below. All values are inches.
| Anchor rod diameter (in.) | Recommended maximum hole (in.) | Minimum washer size (in.) | Minimum washer thickness (in.) |
|---|---|---|---|
| 3/4 | 1-5/16 | 2 | 1/4 |
| 7/8 | 1-9/16 | 2-1/2 | 5/16 |
| 1 | 1-13/16 | 3 | 3/8 |
| 1-1/4 | 2-1/16 | 3 | 1/2 |
| 1-1/2 | 2-5/16 | 3-1/2 | 1/2 |
| 1-3/4 | 2-3/4 | 4 | 5/8 |
| 2 | 3-1/4 | 5 | 3/4 |
| 2-1/2 | 3-3/4 | 5-1/2 | 7/8 |
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AISC Manual 15th-edition Table 14-2 reference as reproduced in Engineering Journal, second quarter 2024. Circular or square washers meeting the size recommendation are acceptable. Washer clearance includes column, weld and rod-position interference. The adopted project base detail selects actual holes and washers, including smaller holes where appropriate.
Anchor rods connect the column base to its foundation interface. The released design selects the hole dimensions and anchor arrangement, while fabrication retains those positions and sizes on the base drawing.
The washer covers the selected hole and bears beneath the nut. Its footprint is coordinated with the column, welds and adjacent stiffeners, including the actual rod position within the clearance hole.
The plate, column and welded attachments retain their specified materials and acceptance requirements. Required material and fabrication records link those components to the supplied base reference.
The released plan dimensions, corner treatment and plate thickness establish the cut part. Hole positions remain referenced to the selected column and anchor datums through the required cutting and drilling operations.
A loose plate retains its own mark and orientation references. A column-attached assembly also identifies the column position, weld preparation and attachment details needed to preserve the same base geometry.
Grout openings, vents, leveling provisions and shear lugs are fabricated where the released base detail includes them. Their location and required clearances remain coordinated with the bearing face and anchor group.
The building or support schedule identifies each column base and its anchor interface. Repeated bases can share fabrication groups while retaining their plate thickness, hole pattern and orientation references.
A survey establishes actual anchor locations, projection and available bearing geometry. The accepted replacement detail resolves those dimensions into the plate, hole and washer arrangement to be fabricated.
Measurements check hole centers, diameters and orientation against the released datum. Column and attachment positions are related to the same reference on an assembled base.
The selected face condition and required weld acceptance are checked against the fabrication specification. Reserved bearing or connection surfaces retain their stated preparation and finish requirements.
Plate marks and drawing revisions connect the finished part to its material and inspection records. Loose washers, lugs or other supplied parts retain their separate identities and counts.
Our offer identifies loose plates or attached assemblies, their preparation and finish. Included plate washers or other loose parts have their own material references and quantities.
Packing supports the plate or assembled column at the agreed contact points. Protection keeps bearing faces, prepared holes and projecting attachments clear of concentrated packing loads.
Packing marks retain the base reference and orientation needed for the installation schedule. The receiving list separates repeated plates, attached columns and separately packed connection parts.
Overall size and thickness establish the raw plate scope. A fabrication offer also includes the specified material, holes, column or stiffener attachments, bearing-face condition, finish and quantity from the released base detail.
Yes, where the project detail selects a smaller hole for its anchor layout and installation tolerance. The table gives recommended maxima; the released base and anchor drawings identify the actual fabricated dimensions.
The structural and fabrication specification identifies the required bearing-face condition and any machining. That preparation is retained as a defined operation on the base-plate or column-assembly line.
Requested anchor rods are itemized separately with their specification, diameter, length, thread and hardware. Their interface remains coordinated with the released base drawing and anchor schedule.
AISC’s base-plate FAQ suggests considering a grout hole when the plate’s smaller side exceeds approximately 24 in. Very large or long rectangular plates may need two openings. The grout-placement plan establishes the selected openings and their positions on the fabrication drawing.
The base-and-foundation detail specifies anchor-rod holes, edge positions, washer seating and erection tolerances. AISC Chapter J and RCSC bolting provisions address steel-to-steel joints; the foundation anchor arrangement follows its own anchorage criteria. We fabricate the plate to the released base detail.
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Send the released base and anchor details, material, plate thickness, quantities and required finish. Identify loose plates or column-attached assemblies and the destination. We return the defined fabrication and separately counted connection-part scope.