Wholesale Heavy Duty Brass Padlock Supplier, OEM/ODM Factory

The Heavy Duty Brass Padlock is built around a thickened pure brass lock body that gives the highest level of security in the brass range, and its precision lock cylinder strongly resists technical unlocking methods. It is the right choice for warehouse gates, cargo containers, and industrial equipment. Zhejiang Rongtao Hardware Products Co., Ltd. is a wholesale Heavy Duty Brass Padlock supplier and an OEM/ODM Heavy Duty Brass Padlock factory in Yiwu, Zhejiang, with eight models that run from the everyday FOXLUX to an AS 4428.17 certified fire safety padlock.

8models in the heavy duty range

20-70mm sizes on FOXLUX and Double Slot

3keys with FOXLUX, Double Slot, and Shrouded Shackle

2024AS 4428.17 certification on the No.003 fire safety model

What Sets a Heavy Duty Brass Padlock Apart

Rongtao Hardware produces every model in this range to international quality standards, and the padlocks are export quality, having passed multiple quality inspection certifications. Three features carry the heavy duty label.

Thickened pure brass body

The pure brass lock body is rust-resistant and corrosion-resistant, with a high-end texture and long service life. The thickened build is what gives this group its top security level.

Precision lock cylinder

The cylinder structure resists technical unlocking methods. On the FOXLUX and Double Slot models it also means smooth unlocking and a low mutual opening rate.

Hardened shackle

The shackle resists sawing and prying. On the fire safety models it is marked HARDENED and is described as anti-cut and anti-pry.

Model Lineup at a Glance

Rongtao Hardware lists eight models in its Heavy Duty Brass Padlock group. The table shows how they differ so buyers can shortlist quickly.

Model	Size (mm)	Shackle	Keys	Typical use
FOXLUX Heavy Duty	20, 30, 40, 50, 60, 70	A3 steel	3 keys	Home, commercial, and industrial locking
Double Slot	20, 30, 40, 50, 60, 70	Hardened steel	3 keys	Home, commercial, and industrial locking
003 Fire	30, 38	Hardened steel	1 key	Fire hydrant boxes and fire extinguisher cabinets
Shrouded Shackle	30, 40, 50, 60	A3 steel	3 keys	Warehouse gates and factory iron doors
Long Shackle Brass Fire	30	Hardened steel	KD or KA	Thick doors and multi-point locking
Red Coated Brass Fire	38	Hardened steel	KD or KA	Quick identification on job-sites
Red Silicone Sleeve Brass Fire	35	Hardened steel	Numbered brass key, KD or KA	Fire hydrants, fire doors, and LOTO
Standard Shackle Fire Safety (No.003)	38	Hardened steel	Numbered brass keys, KD or KA	Fire doors and fire equipment

FOXLUX and Double Slot Compared

These two are the general purpose models of the range. Both use a pure brass body, a fine surface treatment with long-lasting gloss, and come in the same six sizes from 20mm to 70mm.

FOXLUX Heavy Duty

Shackle: A3 steel
Finish: Polishing or brushing
Cylinder: Pin tumbler
Keys: 3 keys
Packaging: Color box or blister
Marking: LOGO embossing and laser marking

Double Slot

Shackle: Hardened steel
Finish: Polishing or brushing
Cylinder: Pin tumbler or ball bearing
Keys: 3 keys
Packaging: White box, blister card, or blister
Marking: LOGO laser marking

Shrouded Shackle Design Against Cutting and Sawing

The Brass Shrouded Shackle Padlock uses a half-covered shackle so that tools cannot fully grip it, and Rongtao Hardware states that its security is far superior to ordinary exposed shackle padlocks.

Half-covered shackle

Greatly improves resistance against cutting, sawing, and violent prying.

Double-direction locking

The shackle is locked in both directions after closing, so it does not release easily under impact or pulling.

The build combines a full brass body, an S-groove brass key, a brass cylinder, brass pins, American double locking bolts, a stainless steel spring, and a heat-treated shackle with an imitation brushed polishing finish. It comes in 30, 40, 50, and 60mm with an A3 steel shackle and 3 keys, and it fits doors, storage cabinets, warehouse gates, logistics truck compartments, and equipment enclosures.

Fire Safety Brass Padlocks for Overseas Projects

Five models in the group are made for fire protection and safety management projects. Rongtao Hardware describes several of them as developed for Australian projects, and it draws on thirty years of experience manufacturing EN 12320 certified padlocks.

30 / 38mm

003 Fire Brass Padlock

Die-cast from solid brass and hardened steel to overseas fire protection AS standards. It is not easy to melt, lock up, or get stuck in high-temperature fire environments. Choose a natural brass brushed finish or red fire-resistant baking paint. The whole series works with the standard 003 universal key, which allows unified management for property and fire maintenance.

30mm

Long Shackle Brass Fire Padlock

An extended hardened steel shackle solves special installation gap requirements, including thick doors and multi-point locking. The number 003 is stamped on the lock body and the keys, and key different and key alike are both available.

35mm

Red Silicone Sleeve Brass Fire Padlock

A red silicone protective sleeve guards the solid brass body against scratches and impact. The serial number 003 sits on the brass plate, and a matching numbered brass key is included. Silicone sleeve colors and shackle length are optional.

38mm

Red Coated Brass Fire Padlock

A bright red coating allows quick identification on site. The shackle is embossed HARDENED, and the 003 number is printed on the lock body. Custom coating colors are available on request.

38mm

Solid Brass Standard Shackle Fire Safety Padlock (No.003)

A ball-pin tumbler cylinder and a hardened steel shackle marked HARDENED. It is certified to AS 4428.17-2024 by Global-Mark, with the certificate valid until 24/08/2030, and it works with the Australian Fire Brigade 003 master key. The serial No.003 is laser engraved on the body with matching numbered keys.

Applications by Security Need

High security

Warehouse gatesCargo containersIndustrial equipmentFactory iron doors

General locking

Home door locksStorage cabinetsLuggageToolboxesGymsSchoolsOfficesCargo transportationLogistics

Fire and safety

Fire hydrant boxesFire extinguisher cabinetsFire pump room doorsPipeline inspection doorsEmergency equipment boxesFire exit doorsLOTO isolationConstruction site safety

OEM/ODM Heavy Duty Brass Padlock Customization

Zhejiang Rongtao Hardware Products Co., Ltd. was established in 2021 in Shangxi Town, Yiwu City, and it owns the Yiwu Shengping Lock Factory, which has nearly 30 years of padlock manufacturing experience. It set up Yiwu Rongtao Renewable Resources Co., Ltd. to control raw materials, and it works from an 18,000 sq m factory with about 100 employees, shipping to more than 20 countries. Those resources let the OEM/ODM Heavy Duty Brass Padlock factory handle the custom work below.

Marking

Custom serial numbers, codes, model numbers, and brand logos by embossing, printing, stamping, or laser engraving on the lock body, keys, or brass panel.

Key systems

Customized key systems including key different, key alike, KD, KA, the 003 master key system, and individual key systems, matched to project needs.

Product options

Special specification customization, custom coating colors, optional silicone sleeves and sleeve colors, custom shackle length, and a long shackle version.

Packaging

Color box, white box, blister card, blister packaging, printed cartons, export outer cartons, and full carton printing, with optional key rings and safety tags.

Heavy Duty Brass Padlock FAQ

What does heavy duty mean for a brass padlock?

It means a thickened pure brass lock body and a precision lock cylinder that resists technical unlocking methods, aimed at high-security uses such as warehouse gates, cargo containers, and industrial equipment.

Which model fits a thick door or a wide gap?

The Long Shackle Brass Fire Padlock has an extended hardened steel shackle for thick doors, multi-point locking, and special gap installations. Its shackle length can also be customized.

Can the locks be numbered for asset management?

Yes. The fire models carry the serial number 003 on the lock body or brass plate, several with matching numbered keys, and custom serial numbers and codes can be laser engraved, stamped, or printed.

Which padlocks are suitable for LOTO work?

The Long Shackle, Red Coated, Red Silicone Sleeve, and No.003 fire safety models are listed for LOTO lockout-tagout isolation, along with construction site safety management.

Do you have padlocks for Australian fire safety projects?

Yes. The No.003 model is certified to AS 4428.17-2024 by Global-Mark and works with the Australian Fire Brigade 003 master key. The other fire models are made for Australian fire hydrants, fire doors, and safety projects.

Do you accept OEM/ODM orders for heavy duty brass padlocks?

Yes. Rongtao Hardware supports OEM and ODM orders with custom logos, key systems, coating colors, and packaging, including blister card packaging and printed outer cartons.