Hangzhou Uniseel Technology Co., Ltd.
Case Study: 43,120 Gold 58mm Unishell Caps for a US Packaging Company
1. A Pallet Order, and a Request to Move Faster
A leading US packaging company recently placed an order with Uniseel for a full pallet of 58mm gold unishell caps fitted with pressure-sensitive (PS) liners — 43,120 pieces in total. The caps will be supplied to the customer's own clients, which means every single unit must meet the strict visual, dimensional and food-contact standards expected on the North American market.
What happened next is a story about flexibility as much as about manufacturing. At the customer's request, we packed 60 pieces of the exact production run and sent them by air freight the very same day the order was confirmed. Air freight reaches the United States in days rather than the weeks a sea container needs, so the customer could start presenting the actual product to their end customers almost immediately — while the full pallet continued its journey by sea.
2. Why the Sample Flight Mattered
Figure 1 - The air-freight sample package: order-matched 58mm gold caps in sealed bags, with full compliance documentation and contact details.
In B2B packaging, trust is built with physical evidence. A specification sheet can describe a cap, but only a real cap can demonstrate the brushed gold finish, the smooth thread engagement and the clean fit of the pressure-sensitive liner on a bottle neck. The US customer knew this, and so did we.
The 60 air-freighted samples were taken directly from the customer's own order — not from a different batch — so what the customer's prospects see is exactly what the full 43,120-piece pallet will deliver. No color deviation, no dimension drift, no 'sample versus bulk' surprises. That is the essence of our 'First Box, Full Answer' philosophy: the first box a customer opens must answer every question they have.
3. 58mm: Uncommon Size, Common Practice for Us
58mm is not a standard shelf size in the closure industry. Most metal cap production worldwide concentrates on the 38mm and 45mm formats used by the beverage and supplement industries. Yet for Uniseel, 58mm is a size we produce regularly. Customers across different markets repeatedly order this diameter for large-format jars, cosmetic pots, honey containers and premium food packaging.
This experience matters on the production line. Our in-house tooling for 58mm caps is already proven, our stamping dies are tuned, and our quality control procedures are adapted to the larger-diameter geometry. A supplier who has never run 58mm before faces weeks of trial and error. We simply schedule the run — which is exactly why the customer could receive order-matched samples within days of confirming the order.
Underpinning every size we produce is our ±0.1mm internal tolerance standard, protected by a portfolio of 21 patents covering precision stamping dies, thread-forming equipment and automated production lines. Large-diameter caps place higher demands on roundness and thread engagement, and it is precisely in this area that our precision-control capability shows its value.
4. The Product: Gold Finish + Pressure-Sensitive Liner
Figure 2 - 58mm gold unishell caps with pressure-sensitive liners: the exact product from the US customer's 43,120-piece order.
The caps in this order combine two characteristics that matter for premium packaging:
Brushed gold finish. The matte, fine-brushed gold surface gives jars a premium shelf presence. The finish is achieved with food-grade organic coating on electrolytic tinplate — no electroplating — which keeps the cap RoHS-compliant while delivering the warm metallic tone customers expect.
Pressure-sensitive (PS) liner. The white PS foam liner bonds to the bottle rim purely under the compression applied when the cap is torqued down. No induction heating equipment is required, which makes PS-lined caps a simple and cost-effective solution for glass, metal and PET containers — and a common choice for aluminum bottles.
As with all Uniseel closures, the caps are produced under ISO 9001:2015 quality management and backed by third-party verification: SGS test reports for food contact (FDA 21 CFR 175.300), REACH SVHC compliance and RoHS, alongside conformity with EU Regulation (EC) No 1935/2004. The sample shipment itself traveled with the full compliance documentation pack — declarations, test report references and contact details — so the customer's team had everything they needed at a glance.
5. What the Customer Experienced
Put yourself in the position of the customer's procurement team. One conversation covered:
A non-standard size — confirmed available, with production experience and proven tooling.
Full order documentation — SGS-backed compliance evidence ready before shipment.
A fast-track sample — 60 order-matched pieces air-freighted the same day.
A full pallet in transit — 43,120 pieces scheduled for sea delivery, with the same quality standard.
This combination — specialty size capability, documented compliance and supply-chain flexibility — is why established packaging companies come to Uniseel for closures they cannot source easily elsewhere.
6. Summary
The 58mm gold unishell cap order for the US market is a textbook example of what Uniseel does best: producing non-standard sizes without compromise, proving quality with hard evidence, and moving at the speed the customer's business requires. Whether a customer needs 60 samples in the air today or 43,120 caps on a pallet tomorrow, the answer is the same — First Box, Full Answer.
Frequently Asked Questions (FAQ)
Q1. Can Uniseel produce 58mm metal caps?
A. Yes. 58mm is a size we produce regularly for large-format jars, cosmetic pots and premium food packaging. Our tooling and production lines are already proven for this diameter, so lead times are comparable to standard sizes.
Q2. What liner options are available for 58mm caps?
A. We offer both pressure-sensitive (PS) liners and induction heat seal (IHS) liners for 58mm caps. The PS liner seals purely by compression during capping and requires no induction equipment.
Q3. What is the application torque for a 58mm cap with a PS liner?
A. Torque should be verified on your capping line with a torque meter. As a general guideline, larger diameters require higher torque than 38mm (17-21 in-lb) or 45mm (20-25 in-lb); our technical team will provide the specific recommendation for your 58mm closure and bottle combination.
Q4. Are the gold caps food-contact compliant?
A. Yes. The caps are tested against FDA 21 CFR 175.300, REACH SVHC and RoHS, with SGS test reports available. They also conform to EU Regulation (EC) No 1935/2004.
Q5. Is the gold finish electroplated?
A. No. The gold finish uses food-grade organic coating on electrolytic tinplate without electroplating, which keeps the caps RoHS-compliant.
Q6. Do you send samples before bulk production?
A. Yes. We support the 'First Box, Full Answer' approach — samples can be drawn directly from the customer's own production order and air-freighted for fast evaluation, as we did for this US customer.
Q7. Can you match samples to the bulk order exactly?
A. Yes. When requested, samples are taken from the same production run as the bulk order, guaranteeing identical color, dimensions and liner performance.
Q8. What is the minimum order quantity for 58mm caps?
A. MOQ depends on the finish, liner and volume required. Contact us with your specification and annual volume for a tailored quotation.
Q9. How do you ensure dimensional accuracy on large-diameter caps?
A. We control an internal tolerance of ±0.1mm, supported by 21 patents covering precision stamping dies, thread-forming equipment and automated production.
Q10. How long does sea freight take for a pallet to the United States?
A. Sea freight typically takes several weeks depending on the port. When speed is critical, we can air-freight sample quantities or even full orders on request.
Uniseel — Unified Quality, Sealed for Safety.
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