OEM/ODM 20/30/40/50/60/70 mm Brass Padlock Manufacturer, Factory

The Brass Padlock is the everyday workhorse of door, warehouse, toolbox, and storage cabinet security, and the right choice comes down to two decisions: the body type (thick, medium thick, or thin) and the size, from a 20mm Brass Padlock up to a 70mm Brass Padlock. Zhejiang Rongtao Hardware Products Co., Ltd. is a China Brass Padlock Manufacturer and OEM/ODM Brass Padlock Factory in Yiwu, Zhejiang, casting its padlocks from pure brass with a hardened shackle for stronger resistance to sawing and prying. As a Custom Brass Padlock Manufacturer, it also supports customized brand logos and keys.

What Makes a Brass Padlock Reliable

Brass is a natural fit for padlocks because it resists rust and corrosion without extra coatings. The Brass Padlock series from Rongtao Hardware is suitable for both indoor and outdoor environments, and the padlocks are made to export quality, having passed multiple quality inspection certifications.

Pure brass lock body

Rust-resistant and corrosion-resistant, with a high-end texture and long service life.

Hardened shackle

Built to resist sawing and prying, which keeps the lock safe and reliable.

Precision lock cylinder

Smooth unlocking and a low mutual opening rate on the FOXLUX, Double Slot, Medium Duty, and STATES models.

Three Body Types in One Brass Padlock Range

The range covers thick body, medium thick body, and thin body padlocks, so buyers can match each lock to a different security level. Rongtao Hardware sorts them into Heavy Duty, Medium Duty, and Thin Brass Padlock groups.

Heavy Duty

Includes the FOXLUX Heavy Duty Brass Padlock, Double Slot Brass Padlock, 003 Fire Brass Padlock, and Brass Shrouded Shackle Padlock, plus the fire safety padlocks covered below. The FOXLUX and Double Slot models each come in six sizes and ship with 3 keys.

Medium Duty

The Medium Duty Brass Padlock has a pure brass body, a pin tumbler cylinder, an A3 steel shackle, and 3 keys, in sizes from 20mm to 70mm. It is a straightforward choice for home, commercial, and industrial use.

Thin Body

The STATES Thin Brass Padlock has a thin and flat body that fits narrow locking gaps where ordinary thick padlocks cannot be installed. It is lightweight, waterproof, and rust-resistant, and suits humid indoor spaces and short-term outdoor use.

Brass Padlock Size Guide from 20mm to 70mm

Size is the first thing importers check. Rongtao Hardware offers the 20mm Brass Padlock, 30mm Brass Padlock, 40mm Brass Padlock, 50mm Brass Padlock, 60mm Brass Padlock, and 70mm Brass Padlock in the FOXLUX, Double Slot, and Medium Duty models. The table shows every size listed for each model.

Model	20	25	30	38	40	50	60	70
FOXLUX Heavy Duty	Yes	-	Yes	-	Yes	Yes	Yes	Yes
Double Slot	Yes	-	Yes	-	Yes	Yes	Yes	Yes
Medium Duty	Yes	-	Yes	-	Yes	Yes	Yes	Yes
Shrouded Shackle	-	-	Yes	-	Yes	Yes	Yes	-
STATES Thin	Yes	Yes	Yes	-	Yes	Yes	Yes	-
003 Fire	-	-	Yes	Yes	-	-	-	-

All sizes are in mm. The AS 4428.17 certified fire safety padlock is a 38mm model.

Model Specifications Compared

FOXLUX Heavy Duty

Body: Brass
Shackle: A3 steel
Finish: Polishing or brushing
Cylinder: Pin tumbler
Keys: 3 keys
Packaging: Color box or blister

Double Slot

Body: Brass
Shackle: Hardened steel
Finish: Polishing or brushing
Cylinder: Pin tumbler or ball bearing
Keys: 3 keys
Packaging: White box, blister card, or blister

Medium Duty

Body: Brass
Shackle: A3 steel
Finish: Polishing or brushing
Cylinder: Pin tumbler
Keys: 3 keys
Packaging: Color box or blister

STATES Thin

Body: Brass
Shackle: Hardened steel
Finish: Polishing
Cylinder: Precision lock cylinder
Keys: 3 keys
Packaging: Skin packaging or white box

Shrouded Shackle Design for Extra Anti-Theft Strength

The Brass Shrouded Shackle Padlock has a half-covered shackle that stops tools from fully gripping it, which greatly improves resistance to cutting, sawing, and violent prying compared with ordinary exposed shackle padlocks. Inside, an internal double-direction locking structure locks the shackle 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. It comes in 30, 40, 50, and 60mm with 3 keys.

Fire Safety Brass Padlocks for Export Projects

Rongtao Hardware manufactures the 003 Fire Brass Padlock to overseas fire protection AS standards from die-cast solid brass and hardened steel. It is described as suitable for bulk export supply to fire protection projects, and it does not jam in high-temperature or outdoor humid conditions. It comes in 30 and 38mm with a natural brass brushed finish or red fire-resistant baking paint, and the whole series works with the standard 003 universal key.

The Solid Brass Standard Shackle Fire Safety Padlock (No.003) is a 38mm model with a ball-pin tumbler cylinder and a hardened steel long 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 lock body with matching numbered keys.

Two more models complete the fire group: the Red Coated Brass Fire Padlock, which uses a bright red coating for high visibility on job-sites, and the Red Silicone Sleeve Brass Fire Padlock, where a silicone cover protects the lock body against scratches and impact.

Where Brass Padlocks Are Used

Doors and gates

Home door locks, balcony sliding windows, courtyard gates, warehouse gates, and factory iron doors.

Storage and tools

Storage cabinets, drawers, toolboxes, meter boxes, dormitory cabinets, and construction site toolboxes.

Logistics and small items

Cargo transportation, logistics truck compartments, turnover boxes, express delivery boxes, luggage, and backpacks.

Fire and safety

Fire hydrant boxes, fire extinguisher cabinets, fire pump room doors, emergency equipment boxes, and LOTO energy isolation.

OEM/ODM Custom Brass Padlock Services

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 for padlock production, works from an 18,000 sq m factory with about 100 employees, and ships to more than 20 countries. That base lets the OEM/ODM Brass Padlock Factory take on custom work across the whole range.

Brand markingLOGO embossing and laser marking; laser engraving of custom serial numbers, model numbers, and warning texts on the fire series

Key systemsCustomized key systems, including KD, KA, the 003 master key system, and individual key systems

SpecificationsSpecial specification customization, and a long shackle version of the fire safety padlock

PackagingColor box, blister card, blister, printed carton, export outer carton, and full carton printing with customer branding

AccessoriesOptional key rings and safety tags on the fire safety padlock

Buyers can send requirements for size, key system, logo, and packaging to sales2@chinajiuzhou.com or call +86-579-85665313.

Brass Padlock FAQ

Which brass padlock sizes can I order?

The FOXLUX, Double Slot, and Medium Duty models come in 20, 30, 40, 50, 60, and 70mm. The Shrouded Shackle model comes in 30, 40, 50, and 60mm, the STATES Thin model in 20, 25, 30, 40, 50, and 60mm, and the 003 Fire model in 30 and 38mm.

How many keys come with a brass padlock?

The FOXLUX, Double Slot, Medium Duty, Shrouded Shackle, and STATES Thin models ship with 3 keys, while the 003 Fire Brass Padlock ships with 1 key.

What is a shrouded shackle padlock?

It is a padlock whose shackle is half covered by the lock body, so tools cannot fully grip it. Rongtao Hardware pairs this with an internal double-direction locking structure in its Brass Shrouded Shackle Padlock.

Can you supply keyed alike or master key systems?

Yes. The fire safety padlock offers KD and KA key systems for bulk engineering orders, and the 003 Fire Brass Padlock offers a 003 master key system and an individual key system. Other models support customized key systems as well.

Is your fire safety brass padlock certified?

The Solid Brass Standard Shackle Fire Safety Padlock (No.003) is certified to AS 4428.17-2024 by Global-Mark, with the certificate valid until 24/08/2030.

Will a brass padlock rust or corrode?

Pure brass bodies resist rust and corrosion, which is why the range suits indoor and outdoor use. The STATES Thin Brass Padlock is suited to humid indoor spaces and short-term outdoor use.