Public Mailbox
SKU: FL-PF-011
Wall-mounted public mailbox. Galvanized steel, weather-resistant.
| Material | Hot-dip galvanized steel (1.2mm) |
|---|---|
| Manufacturing Process | Laser cutting + bending + welding + hot-dip galvanizing |
| Surface Finish | Hot-dip galvanized or powder coated |
| Tolerance | ±0.5mm |
| Dimensions | 400×300×500mm |
| Capacity | 50 letters |
| Mounting | Wall |
| Lock | Standard key |
| MOQ | 50 units |
| Lead Time | Quoted after drawing review and process confirmation |
| Sample Time | Quoted after drawing review and process confirmation |
| Sample Fee | USD 80 |
| Price Range | USD 45-75/unit |
| Applications | Apartment buildings, communities |
| Compliance | ISO 9001 |
| Export Markets | USA, Germany, Australia |
Public mail collection boxes provide convenient mail drop-off points in urban and rural locations. These boxes must protect mail from weather and theft while providing easy mail deposit for the public.
Mailbox Types
Street collection boxes provide curbside mail deposit for the public. Cluster box units (CBUs) provide centralized mail delivery for residential neighborhoods. Apartment mailbox banks provide individual mailboxes for multi-unit residences. Post office box units provide secure mail storage within post offices. Package collection boxes accommodate parcel drop-off for e-commerce returns.
Material and Finish for Outdoor Mailboxes
Stainless steel (grade 304) provides premium mailboxes with decades of corrosion resistance and security. We use 1.5 to 2.5 mm sheet. Heavy-duty galvanized steel provides cost-effective mailboxes with good corrosion resistance. Aluminum provides light weight for residential mailbox units with anodizing for surface protection. Powder coating provides color options and additional protection. All mailboxes must resist prying, cutting, and vandalism attempts.
Design Considerations for Daily Public Use
Mailboxes must protect mail from rain, snow, and humidity. Deposit slots must be sized to accept standard mail while preventing hand insertion for theft. Locking mechanisms must be secure against picking and forced entry. Mail collection doors must be accessible to postal personnel with standard keys. Boxes must be anchored to prevent theft of the entire unit. All edges must be smooth for public safety. High-visibility identification must be permanently displayed. Boxes must meet postal service specifications.
How Public Mailboxes Are Fabricated
Our TRUMPF fiber laser cuts mailbox body panels, doors, and frame components from flat sheet stock. CNC press brake machines form mailbox bodies, doors, and mounting brackets. Component assembly uses TIG welding for stainless steel and MIG welding for galvanized steel, with continuous welds for weather sealing and security. Surface treatments include powder coating in postal service colors, electropolishing for stainless steel, and anti-graffiti coatings.
Field Notes: Public Mail and Parcel Boxes
A public mailbox or parcel locker is a security product before it is a metal box, and the fabrication has to follow from that. The door mechanism is where the security actually lives: the door needs stiffness so that it cannot be sprung far enough to reach the lock, the hinge has to be either concealed or protected so that it cannot be cut or unbolted from outside, and the lock provision has to be compatible with the locking system the operator already uses. On the weathering side, a box that stands outdoors has to drain, because a parcel locker that fills with water at the base will fail at the base weld. And on the finish side, a coated part cannot be repaired in the field, so any fixing that will be drilled on site has to be planned into the cutting rather than added afterwards.
A public mailbox is a low-value item with an unforgiving duty: it lives outdoors, it is opened several times a day by people who are not thinking about it, and if the lock or the hinge goes the whole unit is replaced. Almost every specification decision on this part comes down to those two components and to how the box sheds water.
What Makes a Mailbox Last Outside
The box on this page is 1.2 mm hot-dip galvanized steel at 400 × 300 × 500 mm. Galvanizing is doing the real work here, not the paint: a zinc coating protects the cut edges and the folded corners where a painted part would rust through first. Powder coating over galvanizing is available where the installation has a colour requirement, and it extends the maintenance interval rather than replacing the corrosion protection.
Water management is the second half. A mailbox with a flat top holds water, and water sitting on a horizontal seam finds the lock and the hinge. The top needs fall, the door opening needs a lip or a return that throws water away from the seam, and the bottom needs drainage so condensation has somewhere to go. These are drawing details that cost nothing and decide whether the unit lasts three years or fifteen.
Specifying a Mailbox for Repeated Daily Use
- Lock and hinge specification — the standard key lock is the default. Where a bank of boxes is installed, keying arrangements and whether cylinders are replaceable without tools have to be settled up front.
- Door swing and clearances — a door that needs a hand free to hold it open is a door that gets slammed. Check the geometry against the installed position, not on a bench.
- Mounting to the wall — the fixing pattern has to suit the substrate. A box that pulls away from a block wall is a fixing problem, not a box problem.
- Capacity against opening size — 50 letters is the stated capacity, but the aperture has to admit the largest mail item the building receives while still resisting anything being fished out.
Settling these before tooling is the cheapest intervention available; our DFM review covers them at quotation stage.
How Mailboxes Are Built and Checked
Laser cutting, bending, welding and hot-dip galvanizing, with powder coating as an option. On a 1.2 mm galvanized part the recurring issues are distortion at the welds on the door, and coating damage at the handling points — both are controlled by how the parts are fixtured and racked rather than by the process settings.
Inspection follows the buyer drawing and the approved sample: envelope dimensions, door fit and swing, lock operation, and coating condition on edges. General tolerances are to ISO 2768. Where a buyer wants the galvanizing thickness verified, that is checked per order and recorded on the batch documentation — see material certification and traceability. Units nest for shipment, which is why the MOQ on this part is set where it is; see export packaging standards for how they are packed.
Can we have our own colour and keying?
Yes. Galvanized is the standard finish; powder coating over it is available to a specified RAL. Lock cylinders and keying are bought to your specification and fitted.
Is the box fully sealed against rain?
It is built to shed water — sloped top, protected door seam, drainage at the base. Ventilated to avoid condensation. Not a hermetic seal, which would trap moisture inside instead.
What to Send for Public Mailbox Metal Fabrication Pricing
Dimensions or the existing unit, finish, lock specification, quantity and destination. Timing is quoted after drawing review and process confirmation.
Payment Terms
How a project is paid for is agreed before production starts, and the structure that applies to your order is stated on the quotation and on the order confirmation, so there is no ambiguity later.
- 30% advance payment with the order and the 70% balance before shipment — our standard structure.
- 70% advance payment with the order and the 30% balance before shipment — used for some projects.
- 100% payment in advance before production starts — used for some projects.
If your finance team works to a fixed structure, say so in the first enquiry and we will confirm what applies to your order before you commit. Request a quotation.
Questions buyers ask before sending drawings
The questions that come up most often before a project starts, answered the way we answer them by email.
What do you need from me to quote Public Mailbox?
2D drawings as PDF, DWG or DXF, or 3D files as STEP, IGES or SolidWorks, together with material grade, sheet thickness, surface finish, quantity and destination country. If the drawing is not finished yet, send a photo, a sketch or the existing part instead — we review what can be measured from it and reply with the questions that still need answering.
How long does a quotation take?
Enquiries are answered within one business day. Simple laser-cut and bent parts are quoted within 24 hours. Welded frames, assembled units and multi-part structures are quoted after the drawing review and process confirmation, and the date is confirmed in our reply.
Is there a minimum order quantity?
Prototypes are made from a single piece and small batches of 10–50 pieces are routine. Prototype, first batch and repeat volume are quoted together so the numbers stay consistent as the project scales.
Can you work from a sample or a photo if I have no drawing?
Yes. Send the part itself, clear photographs with a rule or caliper in frame, or a dimensioned sketch. We measure what can be measured, list what is still undefined, and confirm it with you before production.
Need a Similar Part?
Most enquiries that start on a page like this are not an order for Public Mailbox — they are a search for a factory that can make something like it. Send us your drawing, 3D model or sample and we will review the manufacturing process and the quotation requirements, then come back with a process plan, a price and a lead time.
We work from 2D drawings, STEP / DWG / DXF / PDF files, or a physical sample if that is all you have.
No complete drawings yet? Describe the part, send photos or a sketch, or send a sample — we can start from there. Discuss your project.
Trade Terms and Delivery
We quote under the standard Incoterms your logistics team already works with, and build the packing and documentation around the one you choose.
- EXW — you collect from our Ningbo facility and run export clearance through your own forwarder.
- FOB Ningbo — we deliver to the vessel at Ningbo port and handle export clearance.
- CIF — we cover carriage and insurance to your named destination port.
- DDP — we handle carriage, insurance, import clearance and duties through to your door.
Send your destination country, target delivery date and preferred trade term together with the drawing. Request a quotation.
Quotation Time
We quote from your drawings. How long that takes depends on what the part asks for:
- Simple parts — quoted within 24 hours. Laser-cut blanks and bent components, supplied with complete 2D or 3D drawings. Mon–Fri, GMT+8.
- Complex assemblies — quoted after the drawing review. Payment kiosks, multi-part welded frames, enclosures with purchased hardware, or anything needing a coating or assembly trial. We confirm a quotation date once the scope is clear.
Production lead time is quoted separately, after drawing review and process confirmation. Send your drawings.
What stands behind this quotation
- Manufacturing since 20162,500 m² Ningbo plant — 3 laser cutting machines (including newer TRUMPF), 4 CNC press brakes and 10 welding stations.
- Shipped to more than 30 export marketsEnclosures, cabinets and formed parts supplied to OEM buyers across Europe, North America and Asia.
- 123 documented product casesMedical device housings, HVAC and heat pump enclosures, agricultural and livestock equipment, industrial hydraulics, material handling trolleys and EV charging cabinets.
- Factory evidence you can checkTUV Rheinland audit reference MIC-ASI243729 and Bureau Veritas reference MIC-ASR263630 available for buyer review under NDA.
Before you send drawings: an NDA is signed on request · first-article inspection is carried out before a batch continues · pricing is staged from prototype quantity to repeat volume · pre-shipment photos and packing records are prepared when the project needs them.