Custom Sheet Metal Frames, Brackets & Panels

Custom sheet metal frames, brackets, chassis and panels form the structural foundation of many industrial products.

A mounting bracket may support a motor, battery module or electrical component. A sheet metal frame can carry the load of an equipment enclosure or machine assembly. A chassis provides the structural base for electronics, controls or power equipment, while custom panels provide mounting, protection, access and reinforcement.

Unlike standard hardware, these components are manufactured around the exact dimensions, mounting interfaces and loads of the customer’s equipment.

Carsai manufactures custom sheet metal brackets, frames, chassis and panels according to customer drawings using laser cutting, CNC punching, bending, welding, hardware installation, surface treatment and assembly.

Projects can range from one prototype mounting bracket to repeat production of complete frame structures, chassis components and custom sheet metal panels.

What Are Structural Sheet Metal Parts?

Structural sheet metal parts are fabricated components designed to support, locate, connect or protect other parts within a larger product.

Typical examples include:

• Equipment frames
• Mounting brackets
• Battery brackets
• Chassis
• Support structures
• Internal mounting panels
• Equipment panels
• Reinforcement plates
• Covers
• Trays
• Rack mounting components

These parts may appear simple compared with a complete enclosure, but their dimensions can be more functionally critical.

For example, a bracket may contain only two bends and four holes. If the hole locations or flange positions are wrong, the motor or electrical component attached to it may not fit.

For this reason, structural sheet metal manufacturing must focus on final assembly relationships, not only the appearance of the individual part.

Custom Parts vs Standard Sheet Metal Hardware

Standard brackets, rails and frames work well when their dimensions already match the equipment.

Custom fabrication becomes necessary when the product requires:

• Non-standard dimensions
• Special hole patterns
• Custom bend angles
• Specific material thickness
• Multiple mounting interfaces
• Welded reinforcement
• Special finishes
• Integrated hardware

A custom sheet metal bracket, for example, may need to align with three different components simultaneously.

One flange can attach to a machine frame, another support a motor, while slots allow final adjustment during installation.

These relationships cannot usually be achieved efficiently with standard catalog brackets.

Sheet Metal Frame

A sheet metal frame provides structural support for equipment, enclosures or assemblies.

Unlike a heavy structural frame made from large welded steel sections, sheet metal frames can be created from:

• Bent channels
• Folded profiles
• Laser-cut plates
• Reinforcement brackets
• Welded sheet components

This allows relatively thin material to form rigid structures through geometry.

Typical applications include:

• Industrial equipment
• Electrical cabinets
• Battery systems
• Automation equipment
• Electronics
• Telecom equipment
• Machinery

A frame may remain exposed or become the internal structure of a larger enclosure.

Sheet Metal Frames for Industrial Equipment

Sheet metal frames can be designed around the load and mounting requirements of the equipment.

Important factors include:

• Overall dimensions
• Component weight
• Load distribution
• Mounting points
• Panel attachment
• Vibration
• Transportation
• Assembly access

Large equipment may use a welded frame carrying most of the structural load, while thinner external panels provide protection and appearance.

This allows each part of the product to use the material thickness appropriate to its function.

For a detailed look at frame construction, chassis and structural supports, see our guide to sheet metal frames, chassis and support structures.

Bent Sheet Metal Frame Construction

A frame does not always need to be built from separate welded tubes.

Bent sheet metal can create:

• U channels
• C-shaped sections
• Hat sections
• Reinforcement rails
• Structural side members

Bending dramatically increases stiffness compared with flat sheet.

For example, a long flat strip may flex easily, while adding two 90-degree flanges creates a much more rigid channel.

This makes formed sheet metal useful for lightweight equipment structures.

Welded Sheet Metal Frames

More complex frames may contain several separately bent components that are welded together.

A typical process can be:

laser cutting → CNC bending → fixture assembly → tack welding → final welding → inspection → finishing

Welding fixtures are useful for controlling:

• Width
• Height
• Squareness
• Mounting positions
• Diagonal dimensions

Even if each component is individually accurate, heat from welding can move the completed structure.

Critical dimensions should therefore be inspected after welding.

Designing Frame Strength Efficiently

Using thicker material everywhere is not always the most efficient way to create a stronger frame.

Structural performance can often be improved through:

• Additional bends
• Closed or semi-closed profiles
• Reinforcement ribs
• Gussets
• Cross members
• Strategic brackets

This can increase stiffness while reducing unnecessary weight.

For OEM equipment, optimizing geometry can also reduce material cost across repeat production.

Sheet Metal Chassis

A sheet metal chassis usually forms the structural base or internal skeleton of an electrical, electronic or industrial product.

Typical chassis applications include:

• Electronics
• Power supplies
• Control equipment
• Telecom systems
• Industrial automation
• Battery systems

A chassis may support:

• PCBs
• Power supplies
• Fans
• Connectors
• Switches
• Transformers
• Electrical modules

Unlike an external enclosure, the chassis may prioritize internal dimensional accuracy over cosmetic appearance.

Chassis Construction

Common chassis designs include:

• U-shaped base
• Bent tray
• Multi-panel chassis
• Welded internal structure
• Rack-style chassis

The design should provide adequate rigidity while maintaining access for equipment installation.

Typical manufacturing may include:

• Laser cutting
• CNC bending
• PEM hardware installation
• Riveting
• Spot welding
• Powder coating or anodizing

Because electronic components can be closely spaced, mounting relationships can require careful control.

Chassis Mounting Features

Useful features include:

• PCB standoffs
• PEM studs
• Threaded inserts
• Connector cutouts
• Equipment mounting holes
• Cable-management points
• Fan openings

These features can be incorporated during sheet metal production rather than added manually during final assembly.

This reduces downstream manufacturing work for OEM buyers.

Custom Sheet Metal Bracket

A custom sheet metal bracket connects, supports or positions components inside equipment.

Although brackets are often relatively small, they are among the most common custom fabricated parts because equipment mounting dimensions rarely match standard hardware exactly.

Typical applications include:

• Motor mounting
• Battery mounting
• Sensor mounting
• Electrical equipment
• PCB support
• Machine assemblies
• Rack equipment
• Structural reinforcement

A bracket may be as simple as an L-shaped bent part or as complex as a welded multi-piece structure.

Custom Sheet Metal Brackets

Custom sheet metal brackets can include:

• L-shaped brackets
• U-shaped brackets
• Z-shaped brackets
• Offset brackets
• Mounting brackets
• Support brackets
• Battery brackets
• Rack ears
• Motor brackets

The product name matters less than the geometry and functional interfaces defined by the drawing.

Unlike standard commodity brackets, custom parts are usually manufactured from engineering drawings with specified:

• Hole positions
• Bend angles
• Materials
• Thicknesses
• Surface finishes
• Quantities

For a more detailed guide to bracket types and manufacturing, see custom sheet metal brackets and mounting brackets.

Mounting Hole Accuracy in Brackets

Mounting holes are often one of the most important features in a bracket.

Critical dimensions may include:

• Hole-to-hole spacing
• Hole-to-bend distance
• Hole-to-edge distance
• Position relative to another mounting face

An accurately laser-cut flat blank does not automatically guarantee correct final hole position after bending.

Bend angle and flange dimensions also affect the spatial location of the holes.

Functional dimensions should therefore be inspected after forming where necessary.

Bracket Material Selection

Common materials include:

• Carbon steel
• Stainless steel
• Aluminum
• Galvanized steel
• Copper
• Brass

The correct material depends on:

• Load
• Environment
• Weight
• Electrical requirements
• Surface treatment

Carbon steel provides good strength and economical cost.

Stainless steel is useful for corrosion-resistant brackets.

Aluminum is suitable where low weight matters.

Copper and brass can be used for specialized electrical or conductive components.

Sheet Metal Bracket Thickness

Bracket thickness should be selected according to actual load rather than simply choosing the thickest available material.

Increasing thickness affects:

• Weight
• Material cost
• Cutting speed
• Bending force

A formed reinforcement or return flange may sometimes provide more stiffness than increasing the thickness of the complete bracket.

For repeated OEM parts, small reductions in material usage can create meaningful cost savings.

Bracket Reinforcement

Higher-load brackets may incorporate:

• Gussets
• Ribs
• Embossments
• Return flanges
• Welded reinforcement

These features can improve rigidity and reduce deformation under load.

Stamped ribs or formed edges can be particularly efficient because they add strength without requiring a separate welded component.

The best approach depends on production quantity and geometry.

One-Piece vs Welded Brackets

Where possible, a bracket manufactured from one bent blank can reduce:

• Part count
• Welding
• Assembly
• Distortion

However, some geometries cannot be produced from one piece because of:

• Tooling interference
• Material thickness
• Multiple mounting planes
• Structural requirements

These components may need to be produced from several pieces and welded together.

Manufacturing strategy should balance fabrication complexity and assembly cost.

Sheet Metal Panels

Sheet metal panels serve many functions in industrial equipment.

They can be:

• Structural
• Protective
• Removable
• Cosmetic
• Functional mounting surfaces

Typical products include:

• Equipment panels
• Electrical panels
• Control panels
• Side panels
• Rear panels
• Internal mounting panels
• Access panels

A panel may remain flat or include several bends for stiffness and attachment.

Custom Sheet Metal Panels

Custom sheet metal panels can be manufactured with exact dimensions and openings for specific equipment.

Features may include:

• Connector openings
• Displays
• Switches
• Fans
• Cable entries
• Mounting holes
• Ventilation
• Labels or identification areas

Laser cutting is useful for complex custom openings, while punching may be more efficient for repeated holes or louvers.

Bending can then add structural rigidity and mounting flanges.

For more detail on this product group, see custom sheet metal panels, covers and trays.

Increasing Panel Rigidity

A large flat panel can flex significantly.

Instead of simply increasing thickness, rigidity can be improved using:

• Edge flanges
• Return bends
• Formed ribs
• Reinforcement channels
• Welded stiffeners

This is especially useful for:

• Cabinet doors
• Machine panels
• Equipment covers

Good structural design can reduce both material weight and cost.

Internal Mounting Panels

Internal mounting panels are common in electrical and industrial equipment.

They may support:

• DIN rails
• Power supplies
• Terminal components
• Electrical devices
• Mechanical assemblies

These panels can contain:

• Laser-cut holes
• Tapped holes
• PEM hardware
• Mounting studs

They may also use a different material from the external enclosure.

For example, an external cabinet can be powder-coated steel while the internal mounting panel uses galvanized sheet.

Sheet Metal Covers

A cover protects internal components while allowing access when required.

Common designs include:

• Flat removable panels
• U-shaped covers
• Bent covers
• Hinged covers

Covers may attach with:

• Screws
• Captive fasteners
• Rivets
• Hinges

If frequent maintenance is required, fastener accessibility and durability become important.

Sheet Metal Trays

Trays are commonly used to support:

• Batteries
• Electronics
• Power components
• Equipment modules
• Cables

A tray normally includes a base and several bent sides.

Load-bearing trays may require:

• Reinforced edges
• Structural bends
• Additional brackets
• Thicker base material

For battery or heavy equipment trays, the design should account for the actual module weight and support locations.

Materials for Frames, Brackets and Panels

The same material is not necessarily ideal for every structural component.

A single assembly could use:

• Thick carbon steel frame
• Aluminum covers
• Galvanized mounting panels
• Stainless external brackets

Material should be selected according to each component’s role.

Common considerations include:

Material grade should be specified clearly on drawings.

Laser Cutting Structural Sheet Metal Parts

Laser cutting is widely used for custom frames, brackets and panels because it allows detailed geometry to be manufactured directly from CAD data.

Possible features include:

• Outer profiles
• Mounting holes
• Slots
• Tabs
• Connector cutouts
• Ventilation

For prototype and low-volume orders, laser cutting avoids dedicated profile tooling.

This makes it especially suitable for engineered OEM components.

CNC Punching

CNC punching can be efficient when components contain repeated features.

Examples include:

• Panel ventilation
• Repeated mounting holes
• Louvers
• Knockouts

Punching can also create certain formed features that laser cutting cannot produce by itself.

The best process depends on feature geometry and quantity.

CNC Bending

Bending transforms flat blanks into structural components.

Common parts include:

• Channels
• Brackets
• Chassis
• Panel flanges
• Frame members

Important considerations include:

• Bend radius
• Flange length
• Bend sequence
• Hole-to-bend distance
• Tooling access

The final 3D part should be reviewed before the flat pattern is released to production.

Welding Structural Components

Welding is used when several fabricated parts must become one rigid assembly.

Applications include:

• Equipment frames
• Reinforced brackets
• Chassis structures
• Panel assemblies

Welding heat can influence final geometry.

Fixtures and controlled weld sequences help maintain:

• Squareness
• Mounting relationships
• Overall dimensions

Critical dimensions should therefore be checked after welding.

Tabs and Slots for Structural Assembly

Laser-cut tabs and slots can help position components before welding.

This can be particularly useful for:

• Frames
• Bracket assemblies
• Chassis
• Support structures

Benefits include:

• Faster assembly
• Improved repeatability
• Reduced measuring
• Simpler fixtures

A practical clearance should still be provided so components can assemble reliably despite normal manufacturing variation.

PEM Hardware and Threaded Features

Structural sheet metal parts frequently require threaded attachment points.

Common solutions include:

• PEM nuts
• PEM studs
• Rivet nuts
• Weld nuts
• Tapped holes in thicker material

The correct method depends on:

• Material thickness
• Fastener load
• Installation access
• Service requirements

Hardware installation should be considered before bending and finishing because tool access can become restricted later.

Surface Finishing

Common finishes for frames, brackets and panels include:

• Powder coating
• Zinc plating
• Nickel plating
• Anodizing
• Passivation
• Brushing

The correct finish depends on material and environment.

Carbon Steel

Often powder coated or plated.

Stainless Steel

May be brushed or passivated.

Aluminum

Frequently anodized or powder coated.

Galvanized Steel

May remain with its existing zinc coating.

Finish requirements should be included in the RFQ because they influence both price and manufacturing sequence.

Powder Coated Frames and Brackets

Powder coating is widely used for industrial structural parts because it provides:

• Corrosion protection
• Durable finish
• Consistent appearance

However, some areas may need to remain coating-free.

Examples include:

• Grounding points
• Precision mating surfaces
• Threaded areas

Masking requirements should be identified clearly on the drawing.

Prototype Structural Parts

Laser cutting and CNC bending are well suited to prototype frames, brackets and panels.

Prototype production allows engineers to check:

• Mounting
• Fit
• Structural geometry
• Hole positions
• Assembly
• Clearance

Design changes can then be made before larger quantities are produced.

This is particularly valuable when a bracket interfaces with several other components.

Low-Volume Production

Many industrial structural components are produced in relatively low or medium quantities.

Examples include:

• Specialized machinery
• Custom electrical equipment
• Automation systems
• Energy equipment

For these applications, flexible manufacturing can often avoid expensive dedicated tooling.

Production may use:

laser cutting → CNC bending → welding → finishing

with digital programs retained for repeat orders.

High-Volume Production

As quantity increases, other processes may become more economical.

Possible production improvements include:

• CNC punching
• Dedicated stamping tools
• Forming dies
• Welding fixtures
• Assembly jigs

A bracket initially produced through laser cutting and bending might eventually transition to stamping if annual quantities become high enough.

Expected production volume should therefore be included during sourcing.

Structural Part Tolerances

Tolerance requirements should follow the function of the part.

A mounting bracket may require tight control of:

• Hole positions
• Mounting surface locations
• Bend relationships

while a non-mating outside edge can use a normal fabrication tolerance.

A frame may require:

• Overall width
• Overall height
• Squareness
• Mounting-hole alignment

rather than extremely tight tolerances on every individual component.

This approach improves manufacturability and reduces unnecessary cost.

Tolerance Stack-Up

Structural assemblies often contain several components.

Small dimensional variation can accumulate across:

• Brackets
• Frame members
• Panels
• Welds
• Hardware

This can affect final equipment alignment.

Engineering drawings should use functional datums and clearly identify dimensions that control assembly.

Design for Easier Manufacturing

Several DFM principles can improve structural sheet metal parts.

Useful practices include:

• Standardize bend radii
• Avoid very short flanges
• Keep critical holes away from bends
• Reduce unnecessary welds
• Use tabs and slots
• Use realistic tolerances
• Standardize fasteners
• Add formed reinforcement instead of unnecessary thickness

These changes can improve both cost and repeatability.

Reducing Part Count

One of the most effective ways to reduce fabrication cost is to reduce unnecessary components.

For example, a separate flat plate and two brackets may sometimes be redesigned as one bent component.

Benefits can include:

• Less welding
• Less hardware
• Lower assembly labor
• Fewer inventory items

However, combining too many functions into one complicated part can also increase manufacturing difficulty.

The goal is to find the simplest practical structure.

Designing for Assembly

Structural parts should make final product assembly easier.

Useful features include:

• Locating tabs
• Slots
• Alignment holes
• Captive hardware
• Accessible fasteners

A good custom bracket does more than support a load—it can also help locate the attached component accurately during assembly.

For repeat OEM production, these small design features can reduce assembly time substantially.

Frame and Panel Interaction

Frames and panels should be designed as one system.

The frame controls structural geometry.

Panels attach to the frame and may provide:

• Protection
• Access
• Appearance

Mounting points should allow panel variation without creating visible misalignment.

For example, slotted mounting holes can sometimes provide practical assembly adjustment while the structural frame maintains the critical dimensions.

Structural Parts for Electrical Equipment

Electrical and power equipment commonly uses:

• Frames
• Battery brackets
• Mounting panels
• Chassis
• Support structures

These components may need to support:

• Busbars
• Batteries
• Breakers
• Power supplies
• Control equipment

Load and electrical requirements should both be considered.

Some surfaces may also require grounding or coating-free contact areas.

Structural Parts for Machinery

Machinery uses custom brackets and frames to support:

• Motors
• Sensors
• Guards
• Controllers
• Covers
• Mechanical assemblies

Mounting relationships can be particularly important when the sheet metal component interfaces with CNC-machined parts.

Critical holes and mounting surfaces should therefore be clearly identified on the drawing.

Frames and Brackets for Battery Equipment

Battery and energy-storage systems can require:

• Battery brackets
• Module support frames
• Trays
• Cabinet structures
• Internal supports

Structural design should consider:

• Module weight
• Mounting locations
• Cable clearance
• Busbar clearance
• Maintenance

For repeated module positions, consistent spacing is especially important.

Quality Inspection

Inspection methods depend on the part.

Typical bracket inspection can include:

• Hole spacing
• Flange position
• Bend angle
• Overall dimensions

Frame inspection may include:

• Width
• Height
• Diagonal squareness
• Mounting locations

Panel inspection may include:

• Cutout position
• Flatness
• Bend dimensions
• Cosmetic surface

Inspection should focus on the dimensions that affect final assembly.

First Article Inspection

Before full production, the first completed part or assembly can be checked against the drawing.

This is useful for verifying:

• Cutting program
• Bending
• Welding fixture
• Hardware
• Surface finish

Corrections can then be made before the entire order is manufactured.

For repeat OEM products, the approved first article can serve as a useful production reference.

What Affects the Cost of Frames, Brackets and Panels?

Major cost factors include:

• Material
• Thickness
• Part size
• Cutting complexity
• Number of bends
• Welding
• Hardware
• Surface finish
• Tolerances
• Quantity

A small bracket is not automatically inexpensive.

A small component containing many bends, tight tolerances and welded reinforcement can require more manufacturing time than a much larger simple panel.

Drawings are therefore necessary for accurate pricing.

Choosing a Structural Sheet Metal Parts Manufacturer

When sourcing custom frames, brackets and panels, buyers should evaluate whether the manufacturer can manage the complete component.

Useful capabilities include:

• Laser cutting
• CNC punching
• CNC bending
• Welding
• Hardware installation
• Surface finishing
• Assembly
• Inspection

The manufacturer should also understand how the part interfaces with the customer’s equipment.

For structural OEM parts, fit and mounting relationships are often more important than cosmetic appearance alone.

What to Include in an RFQ

For accurate quotation, provide:

1. 2D engineering drawings
2. 3D STEP model
3. Material grade
4. Thickness
5. Quantity
6. Critical dimensions
7. Surface finish
8. Welding requirements
9. Hardware
10. Assembly requirements

For structural frames, include relevant load or mounting information where it affects fabrication requirements.

For brackets, clearly identify critical mounting interfaces.

For panels, specify cosmetic surfaces when applicable.

Request Custom Sheet Metal Frames, Brackets & Panels

Carsai manufactures sheet metal frame, chassis, structural panel and custom sheet metal bracket components according to customer drawings.

Projects can include individual custom sheet metal brackets, larger sheet metal frames, precision sheet metal chassis, equipment supports and custom sheet metal panels manufactured from carbon steel, stainless steel, galvanized steel and aluminum.

Production can combine laser cutting, CNC punching, bending, welding, hardware installation and surface finishing according to the final part requirements.

Whether the project involves a small mounting bracket, structural frame, chassis or large equipment panel, material, thickness, geometry, load, tolerances and assembly interfaces should be considered together.

Providing complete drawings and expected quantities allows the appropriate fabrication process to be selected from prototype through repeat OEM production.