Locks and Deadbolts: Square, Cast, Brass, Stainless Steel, and Rim Locks—How to Choose the Right Lock for Every Door
, by عامر شوب, 3 min reading time
Padlock Guide: The difference between square, scabbed, brass, and stainless steel padlocks, sizes in mm, the long shackle and weather resistance, wheel, container, burial, and parking lot padlocks.
A lock is the last line of defense for your shop, warehouse, or on-site tool storage. A weak lock can be broken in minutes with bolt cutters or a sledgehammer. That's why choosing a lock isn't just about the price, but also the location, size, and type of threat. This guide explains the available types and when to use each one.
First: Size in mm
The lock size (e.g., 40, 50, 60, 70, 90 mm) is the width of the lock body. The larger the size, the bigger the body and the thicker and harder to cut the shackle (ring).
| Size | Use |
|---|---|
| 20–40 mm | Lockers, bags, toolboxes, lockers |
| 50–60 mm | Small storage doors, gates, rooms |
| 70–90 mm | Shops, warehouses, garage doors, containers |
1. Heavy-Duty Square Iron Lock
Wide iron body and thick shackle. This is what people look for when they search for a "square lock." Suitable for shops and warehouses.
2. Padlock (Heavy Black)
Solid body with a black finish, available in many sizes. A mid-range option between light and heavy.
3. Brass Lock
Brass does not rust, so it lasts longer in damp places. Suitable for homes, lockers, and light exterior gates.
4. Long-Shackle Lock
The long shackle reaches further and is suitable for chains, double gates, and thick chains.
5. Weather-Resistant Lock
Features a cover that protects the keyhole from rain and dust. Excellent for exposed areas: farms, exterior gates, and counters.
6. Specialty Locks
- Container lock: Designed for container handles and on-site containers.
- Wheel lock: Secures a car or cart wheel and prevents it from moving.
- Parking lock: Reserves your parking space.
- Mortise lock: Installed inside a wooden door.
- Child safety locks: For lockers and drawers.
Which lock for which location?
| Location | Recommended lock |
|---|---|
| Shop or warehouse door | Heavy-duty square iron, 70–90 mm |
| Exterior gate or farm | Weather-resistant or brass |
| Chain or double gate | Long shackle |
| On-site container | Container lock |
| Locker or toolbox | Small brass, 20–40 mm |
Security tips
- A lock is only as strong as its weakest point: If the shackle or chain is thin, the strength of the lock doesn't matter.
- Lubricate the lock twice a year with graphite lubricant, especially exterior locks.
- For shops, use two locks of different types.
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