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FEFCO 0974

Self-Locking Triangular Corner Brace

  • Available in a wide range of custom configurations & material selection.
  • Order 1 sample. Or order 100K+ units. Or anything in between.
  • Affordable delivery across North America.
  • Design support, warehousing, testing, assembly available.
  • Widest machinery capability in America via 30+ specialist partner plants.
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Product details

Top highlights

  • Self-locking tabs hold the 3D triangular shape outside the box
  • Hollow diagonal air gap provides a dedicated corner crumple zone
  • Requires die-cutting, unlike simple open-truss pads

About this product

Heavy-duty corner protection often requires a balance between shock absorption and packing efficiency. The self-locking triangular corner brace provides a rigid, right-angled crumple zone that isolates vulnerable product edges from direct impact.

By spanning the 90-degree corner of a master carton, this corrugated pad creates a hollow diagonal air gap. Because it features interlocking flaps, pack-bench operators can pre-assemble the braces ahead of time, keeping fulfillment organized when handling heavy or fragile square goods.

Common uses

  • Pre-assembled kitting and fulfillment
  • Heavy-duty corner shock absorption for furniture and electronics

Get a quote

Share what you know. We'll take it from there. Or email us at info@herculeindustrial.com

Best Price Guarantee

Already have a packaging quote? Let us beat it.

Send us the quote you have. We will beat it for the same specifications, quantity, and delivery requirements.

Upload a competing quote

Free quote review. No obligation.

30+specialist partner plants

We supply through the plant best suited to your price, material, production, and delivery requirements.

Why we can beat a lower quote

30+ plants give us more ways to lower the price.

Each plant has different machinery, material costs, order minimums, and freight rates. Our buying volume helps us secure better pricing. We then quote through the plant that gives you the lowest total price for your requirements.

Send us your current quote. Watch us beat it.

Attach it to the quote form or email it to us. We'll review it free and send you our price.

Upload a competing quoteinfo@herculeindustrial.com
Best Price Guarantee terms

To qualify, send a written supplier quote dated within the past 30 days and addressed to your company. It must cover the same dimensions, construction, material, print, finish, quantity, tooling, freight, delivery date, and delivery location. The guarantee does not cover taxes, expired quotes, liquidation or clearance sales, or obvious pricing errors.

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Corner Protection and Pre-Assembly Workflows

Pre-assembled kitting and fulfillment

Because the side flaps lock into place, these braces can be folded into rigid triangles before the product arrives at the packing bench. This allows fulfillment teams to prep their protective components in batches, rather than fighting board spring-back while trying to load a heavy item.

Heavy-duty corner shock absorption

The diagonal face spans the corner of the master carton, creating a hollow void. When the outer box takes a corner impact, this air gap acts as a crumple zone, absorbing kinetic energy before it reaches the product inside.

Edge isolation for fragile panels

When packing glass, monitors, or finished wood, the brace keeps the actual product corner suspended away from the outer box walls, preventing direct transfer of crushing forces.

Vertical column reinforcement

When cut so the corrugated flutes run vertically and extended to the full height of the master carton, the brace acts as a load-bearing column in the corner to resist top-down crushing.

Product Types That Need Diagonal Bracing

Furniture and heavy electronics

Square and rectangular goods with vulnerable corners benefit from the deep standoff this brace provides. The rigid hypotenuse face distributes the product's weight across the two outer walls of the master carton, keeping the actual corner isolated from direct strikes.

Industrial equipment shipping

Heavy machined parts or motors that might otherwise punch through a standard corrugated box can be restrained using these dense corner buffers, keeping the payload centered and secure.

High-value appliance distribution

Appliances require clear standoff from the outer packaging to prevent cosmetic denting during transit. The hollow air gap provides that necessary clearance while maintaining structural rigidity.

When to Consider Simpler or Denser Corner Pads

High-speed automated packing lines

The locking tabs require precise, two-handed manual folding to engage the slots against the natural tension of the corrugated board. If your line relies on automated insertion or high-speed robotic pick-and-place, a simpler friction-fit pad or a pre-glued component makes more sense.

Extreme weight applications requiring dead-stop cushioning

While the hollow air gap absorbs shock well, extremely heavy items might crush the triangle completely. In those cases, a dense, multi-wall nested block provides a solid dead-stop cushion.

Close variants and lookalike dielines

The closest library neighbors include 0973, 0972, 0975. Use this as a variant check if a buyer brings an old code, sample, or dieline that looks close. The deciding details are usually the lock, slot, closure, wall build, part count, or fold sequence.

Board Thickness, Die-Cutting, and Assembly Fatigue

Balancing board strength with assembly effort

Heavy single-wall or double-wall board increases the crush resistance of the corner truss. However, thicker board increases the manual force required to fold the panels and insert the locking tabs. If the board is too thick, the tabs may tear or become impossible for operators to lock efficiently.

The die-cutting requirement

The interlocking tabs and non-linear side flaps mean this pad must be manufactured on a flatbed or rotary die-cutter. If you are running a very short trial and want to avoid die-cutting entirely, a simpler open truss might be a better starting point.

Flute direction for stacking strength

If you need the corner brace to help support the weight of pallets stacked on top of the master carton, specify that the flutes must run vertically when the pad is in its final 3D orientation.

Clearance inside the master carton

The depth of the corner legs must be mathematically synced to the diagonal face. You must know the exact internal dimensions of your outer box to ensure the brace fits snugly without bowing.

Adjusting the Brace Dimensions

Scaling the brace depth and length

The overall length of the pad can be extruded to match the full height of your master carton, acting as a vertical column. The depth of the corner legs can also be adjusted, but they must remain mathematically synced to the diagonal face to ensure the brace still fits perfectly into a 90-degree corner.

Modifying tab clearances for thicker board

If you upgrade to a heavier board grade for better protection, the receiving slots for the locking tabs must be widened so the pad can still be assembled without tearing.

Adding corner chamfers

If the inside corners of your master carton have glue joints or tape that might interfere with a sharp 90-degree pad, the apex of the brace can be slightly chamfered to ensure a clean fit.

Board and packing details

Prototype testing for tab engagement

Because the locking mechanism relies on precise clearances, it is highly recommended to request a digital CAD sample cut from your exact intended board grade. This allows you to verify that the tabs lock securely without tearing before committing to a full production run.

Additional notes

Short digital trial versus repeat run

For initial testing, a few prototypes can be cut on a digital table to verify the locking tabs and drop performance. Once the fit is approved, the die-cutting process is set up for efficient repeat production.

Related Internal Protectors

0973: Open Triangular Truss

A similar diagonal corner brace that lacks side flaps and locking tabs. It cannot hold its shape outside the box, but it can be manufactured on a slitter-scorer without die-cutting.

0971: Solid Labyrinth Corner Block

A dense, multi-wall nested block that fills the corner entirely rather than leaving a hollow air gap. Uses much more board but provides a dead-stop cushion for extreme weights.

0972: Corner Protector

Nearby FEFCO style to review if the buyer wants a similar job but the closure, flap overlap, wall build, or part count changes the package choice.

0975: Corner Brace Pad

Nearby FEFCO style to review if the buyer wants a similar job but the closure, flap overlap, wall build, or part count changes the package choice.

FAQs

Assembly and Packing

Can this corner brace be inserted by automated machinery?

Generally, no. The unfastened blank requires complex two-handed 3D folding and precise tab insertion to lock the shape. It is designed for manual pack-bench assembly, where operators can fold and lock the braces before dropping them into the box.

Protection and Fit

Does this pad provide vertical stacking strength?

If the pad is cut so the corrugated flutes run vertically, and the pad extends the full height of the master carton, it can act as a load-bearing column in the corner to resist crushing.

Production and Tooling

Why does this corner pad require die-cutting?

While simple scored pads can be produced with straight cuts and creases, the 0974 features extending side flaps, locking tabs, and receiving slots. These irregular shapes require a dedicated die-cutting process to stamp out the exact profile.

Board Choice

Should we use double-wall board for maximum corner protection?

Double-wall board offers excellent shock absorption, but it can make the locking tabs too thick to engage properly without tearing. If heavy board is required, the slot clearances must be carefully adjusted, and physical assembly testing is strongly recommended to ensure your packing team can actually fold it.

Shipping Route

Can this brace be shipped flat to our facility?

Yes. The pads are delivered as flat die-cut blanks, which provides excellent pallet density. Your team will fold and lock them into 3D triangles at the packing station.

Product Context

What product details help specify the right corner brace?

Sharing the exact dimensions of your master carton, the weight of the product, and the clearance available in the corners will help determine how deep the diagonal brace needs to be and what board grade will absorb the impact without making the tabs too stiff to fold.

Protection and Fit

How does the hollow air gap protect the product?

The diagonal face spans the corner, leaving the actual 90-degree corner empty. When the outer box takes an impact, the corrugated board crumples into this empty space, absorbing the kinetic energy before it reaches your product.

Design and Fit

Can we adjust the angle of the diagonal face?

The brace relies on strict right-triangle geometry to fit into the corner of a standard box. While the overall size can scale up or down, the 90-degree corner and the corresponding diagonal face must remain mathematically synced.