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ECMA X38

Reclosable Claw-Lock Closure for Folding Cartons

  • 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

  • Illustrated host uses a tape-free claw-lock closure
  • Host-carton assembly depends on the selected carton design
  • Claw-lock feature can support repeated opening and reclosure

About this product

ECMA X38 specifies a reclosable opening with a claw-lock system. It is a Group X feature used with a folding-carton design. The illustrated carton applies that lock to one closure; the X code does not define a claw-lock bottom or a specific carton body.

The claw-lock feature can add retention to a suitable host closure while the base carton and packing method are selected separately.

Common uses

  • Cosmetics
  • Pharmaceuticals
  • Light retail goods
  • Boutique items

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.

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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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Retail and Presentation Packaging

Primary Retail Packaging

The claw-lock provides a clean, uninterrupted base without tape or glue residue. This makes it useful for products that sit directly on retail shelves or in display trays, where presentation matters from every angle.

Reusable or Inspectable Kits

Because the claw lock is a mechanical friction fit, the bottom can be carefully opened and reclosed without destroying the carton. This is useful for kits that may need inspection or components added late in the fulfillment process.

Lightweight Consumer Goods

For items that do not exert heavy downward pressure, the friction lock provides enough support without needing a glued base. This keeps the package simple while maintaining a flat bottom profile.

Mid-Volume Rollouts

When order volumes are too low to justify the setup of a pre-glued crash-lock base, but the presentation needs to look professional, the claw-lock offers a practical middle ground.

Product Categories Using the Claw-Lock

Cosmetics and Health Care

These sectors often need premium finishes and clean lines. The claw-lock bottom supports high-quality graphics on solid bleached board while maintaining a secure base for bottles, jars, or tubes.

Boutique and Specialty Goods

For brands scaling up from short runs but not yet ready for fully automated cartoning lines, the claw-lock offers a professional look with manageable manual packing labor.

Pharmaceuticals and Supplements

When products are packed in lightweight blister packs or small bottles, the claw-lock provides a clean closure that can be easily opened by the end user if needed.

When to Compare Auto-Bottoms or Standard Tucks

High-Volume Fulfillment (Crash-Lock Base)

If your packing line needs maximum speed, the manual folding required for a claw-lock will become a bottleneck. Compare a crash-lock carton, which is pre-glued at the factory and opens quickly, reducing labor time.

Heavy or Fragile Goods

The claw lock relies on friction and the tear strength of the paperboard. For heavy items that exert heavy downward pressure, a fully glued bottom or a reinforced corrugated structure is a better choice to prevent the base from disengaging.

Direct-to-Consumer Parcel Shipping

Friction-locked cartons can open during rough courier transit. If this carton is shipping directly to a consumer via parcel networks, it is worth comparing an outer shipping box or adding a secure external seal.

Board Choice, Assembly Labor, and Route Planning

Packing Labor vs. Manufacturing Route

The primary tradeoff with a claw-lock is labor. The carton is simpler to manufacture than an auto-bottom because it only requires a straight-line glue seam. However, your fulfillment team must manually fold the four bottom flaps for every unit.

Material Tear Strength

The security of the lock depends on the rounded claw tab not tearing under stress. Virgin fibers like Solid Bleached Sulfate (SBS) or Folding Box Board (FBB) perform well. Recycled boards with shorter fibers may tear at the lock point during assembly or repeated use.

Product Weight and Base Support

Because the base relies entirely on the friction of the claw and the receiving slot, the exact weight of the product should be checked against the board grade to ensure the bottom does not bow or disengage.

Top Closure Style

While the X38 code defines the bottom claw-lock, the top closure can be configured to match your needs. A basic slit-lock tuck top is common, but reverse tucks or tamper-evident features can be specified depending on the product.

Top Closure and Lock Tightness Options

Top Closure Variations

The top closure can be adapted to a basic tuck, reverse tuck, or a specialized lock depending on how the product is loaded and presented.

Lock Tightness

The radius of the claw and the width of the receiving slot can be adjusted during structural design. A tighter fit increases security but requires more dexterity from the packer.

Dust Flap Modifications

The minor dust flaps can be shaped or angled to accommodate specific product profiles or to make the manual folding process slightly smoother.

Board and packing details

Flat Delivery and Storage

Like most folding cartons, these are delivered as flat sleeves. They are very efficient to ship and store, taking up minimal warehouse space before fulfillment.

Additional notes

Fulfillment line setup

Ensure your packing stations have enough space for operators to comfortably use both hands to erect the bottom before loading the product from the top.

Grain direction

For maximum strength, the paperboard grain should run horizontally around the carton to prevent the main panels from bulging and to keep the lock engaged.

Related Bottom Closures

A56.20.01.03: Classic Snap-Lock Bottom

A traditional 1-2-3 bottom without the specific rounded claw feature. Often used for similar retail applications.

FAQs

Assembly and Labor

How long does it take to assemble a claw-lock bottom?

It requires manually folding in two dust flaps, the receiving flap, and finally pushing the claw flap into the slot. It is faster than taping a box but noticeably slower than a pre-glued crash-lock bottom.

Strength and Security

Will the bottom hold heavy items?

The claw lock is designed for light to medium-weight retail goods. Heavy items can cause the friction lock to disengage or the paperboard to tear. Testing a physical sample with your exact product weight is a good idea.

Materials

Can this be made from corrugated board?

It is usually not a good match. The thickness and fluting of corrugated board make the precise friction fit of the claw and slot difficult to engage. It performs well in common folding carton paperboards.

Shipping

Can I ship this directly in the mail?

Friction-locked folding cartons are primary retail packaging. They usually need an outer corrugated shipper to handle parcel courier networks safely.

Reusability

Is the bottom truly reclosable?

The claw can be un-tucked and re-inserted. However, because it is made of paperboard, repeated opening and closing will eventually wear down the tab and weaken the lock.

Production

Does this require special gluing equipment?

The claw-lock bottom itself is not glued. The carton only requires a straight-line side seam, which is a common production route.

Materials

What board types work well for the claw lock?

Virgin fiber boards like SBS or FBB are often chosen because they have the tear strength needed to keep the claw tab intact during assembly and use.

Design

Can the top closure be changed?

Yes, the X38 template defines the bottom closure. The top can be configured as a straight tuck, reverse tuck, or other common closure depending on your presentation needs.