51mm die-cast body with hardened steel shackle

Master Lock 178 51mm Combination Padlock Hardened Steel Shackle

Name: Master Lock 178 51mm Combination Padlock Hardened Steel Shackle
Brand: Master Lock
SKU: 0178
Price: 51.18 AUD
Availability: InStock

SKU 0178

By: Master Lock

$51.18 - $51.18

$51.18

$51.18 - $51.18

$51.18

Availability: This product will be delivered in 3-5 business days

Quantity

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Delivery Notice:

Please allow 3-5 business days for processing before it's ready for delivery or pickup. All standard delivery options still apply.

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Product Description

Master Lock 178 Combination Padlock (51mm) – Keyless Combination Lock

Instantly establish heavy-duty, keyless access control on critical commercial and industrial perimeters with the highly formidable, tamper-resistant Master Lock 178 Combination Padlock. In highly secure environments like remote construction sites, commercial storage units, and utility substations, distributing physical keys to dozens of contractors is a massive security liability. If a key is lost, the entire facility is compromised. This elite, commercial-grade keyless combination lock acts as the ultimate access management solution. It operates entirely via a highly secure, 4-digit set-your-own numeric dial system located safely on the bottom of the lock, providing 10,000 unique possible code variations and ensuring absolute access control without ever cutting a single key.

Engineered for unwavering commercial durability and absolute worksite survival, the Master Lock 178 features a massive 51mm wide solid die-cast metal body. This heavy-duty footprint provides terrifying physical strength against brute-force hammer strikes and severe tampering. Fortified with a highly cut-resistant 8mm hardened steel shackle, it aggressively destroys the blades of opportunistic bolt cutters and resists aggressive sawing. Crucially, the combination can only be reset using the highly specialized 'combination change key' (included in the package), ensuring unauthorized personnel can never maliciously change the code while the lock is open. Backed by a Limited Lifetime Warranty, this rugged heavy duty padlock is the definitive, high-security upgrade for modern commercial facilities.

Who Is The Master Lock 178 Combination Padlock Ideal For?

This massive 51mm padlock delivers commercial-grade keyless access, a hardened steel shackle, and secure combination resetting. It is highly recommended for:

Construction & Tradespeople: Utilizing a highly reliable keyless combination lock to secure massive jobsite perimeter gates and heavy-duty toolboxes, allowing dozens of sub-contractors to access the site simply by knowing the code.
Commercial Storage Facilities: Relying on the incredibly tough 8mm hardened steel shackle and die-cast body to perfectly secure massive roller doors on storage units against highly aggressive bolt-cutter and hammer attacks.
Utility & Infrastructure Managers: Deploying the heavy duty padlock to secure remote electrical substations and water treatment valves, ensuring rapid access for emergency maintenance crews without hunting for keys.
Facility Managers: Taking absolute advantage of the specialized 'change key' system. It guarantees that random staff members or contractors cannot accidentally or maliciously change the lock's combination while the gate is open.

Key Features and Performance Benefits:

4-Digit Resettable Combination: The ultimate keyless convenience. The lock features 4 numbered dials, giving you exactly 10,000 possible code combinations. You can grant access to anyone instantly, entirely eliminating the massive expense of cutting and tracking physical keys.
Massive 51mm Die-Cast Metal Body: Forged for extreme survival. The heavy-duty 51mm body is constructed from solid die-cast metal. This provides massive physical strength to survive violent hammer strikes and severe tampering attempts on remote worksites.
Hardened Steel Shackle: The absolute deterrent against cutting tools. The thick 8mm shackle is forged from heavy hardened steel, making it incredibly difficult for opportunistic thieves to cut with standard saws or medium bolt cutters.
Secure Combination Change Key System: A massive commercial security feature. On cheap locks, anyone can change the code if the lock is open. The Master Lock 178 requires you to insert a specific metal 'Change Key' into the side of the lock to reprogram it, guaranteeing absolute administrative control.
Bottom-Mounted Dials: Highly weather resistant. Because the dials are mounted on the bottom of the lock body, they are naturally shielded from direct, driving rain and settling dust, ensuring the mechanism remains smooth and easy to spin for years.

Technical Specifications & Dimensions:

Brand: Master Lock
Model Number: 178 (Item Code: 0178)
Product Type: Combination Padlock / Keyless Combination Lock / Heavy Duty Padlock
Body Width: Massive 51mm
Body Material: Solid Die-Cast Metal
Shackle Diameter: 8mm (Hardened Steel)
Shackle Clearance: 25mm (Vertical Height)
Lock Type: 4-Digit Resettable Combination (Requires change key to reset).
Inclusions: 1x Padlock, 1x Metal Combination Reset/Change Key.

Delivery Information

Dispatch: Items marked as “In stock” or “Ready to be shipped” are usually dispatched within 1 business day after payment is received. If an item is not in stock and ordered from our supplier, please allow 3–5 business days for processing before it is ready for delivery or pickup. All standard delivery options still apply.

Shipping: Delivery costs are calculated at checkout based on your location and order size. Bulky items and chemicals may attract additional freight charges and cannot be sent to PO Boxes.

Delivery: Parcels are delivered by road freight. Authority to leave may be used if no one is available to receive the order. For full details, please see our Shipping & Delivery Policy

Business days to delivery

NSW
City	1 Day
VIC
Melbourne	1 Day
Regional	3–4 Days
QUEENSLAND
Brisbane	1–2 Days
Regional	3–4 Days
SOUTH AUSTRALIA
Adelaide	2–3 Days
Regional	4–5 Days
NORTHERN TERRITORY
All Areas	4–6 Days
WESTERN AUSTRALIA
All Areas	4–6 Days
TASMANIA
All Areas	4–6 Days

Frequently Asked Questions

What makes a 51mm padlock better than a 40mm padlock?

A 51mm body width provides a much heavier, more massive physical presence. It is considered a heavy-duty commercial footprint, offering vastly superior resistance against hammer blows and acting as a much stronger visual deterrent than a smaller 40mm lock.

Can I change the combination to a number I want?

YES! The combination is fully 'Resettable' and gives you 10,000 possible options. However, unlike cheap locks, you must use the special metal 'Change Key' included in the box to initiate the reset process, which provides massive security control.

What is the point of the 'Change Key'?

With standard combination locks, if you leave the lock hanging open on a gate, a malicious person can easily change your code, locking you out. The Master Lock 178 requires the physical metal 'Change Key' to be inserted to alter the code, completely preventing unauthorized tampering.

What happens if I lose the 'Change Key'?

The change key is a generic physical tool used to engage the internal reset clutch. If you lose it, the lock will continue to function perfectly on its current code, but you will not be able to program a NEW code until you obtain a replacement change key.

What happens if I forget my 4-digit code?

If you forget your custom code and the lock is closed, there is absolutely no override key or 'master reset' button. For security reasons, you will be permanently locked out and will have to physically cut the massive 8mm shackle off to open it. Always write your code down!

Is the Die-Cast Metal body good for outdoor use?

Yes. Die-cast metal is highly robust and weather-resistant. Furthermore, because the dials are located on the BOTTOM of the lock, they are naturally protected from direct rain and dirt settling inside the mechanism, making it highly reliable for outdoor gates.

Is it difficult to pick the combination?

Because the lock features 4 separate numbered dials, there are exactly 10,000 unique possible code combinations. This makes it mathematically incredibly difficult and highly time-consuming for a thief to 'guess' your code.

Will the 8mm shackle fit my gym locker?

Likely NO. An 8mm thick shackle is designed for heavy-duty commercial hasps, thick security chains, and large gate latches. It is generally too thick to fit through the tiny holes on standard personal gym lockers or luggage zippers.

Can I use this lock to secure a commercial shipping container?

While it is highly durable, a 51mm body with a 25mm shackle clearance might be slightly too small to easily navigate the massive, heavy-duty locking bars of a commercial shipping container. For shipping containers, you should look at the larger 64mm Master Lock.

Are the numbers painted on or engraved?

On premium Master Lock combination padlocks, the numbers are deeply molded or engraved into the dials and then painted. This ensures the numbers will not simply rub off after months of sweaty, dirty fingers spinning the dials on a construction site.

Is it difficult to spin the dials?

No. The precision-engineered dials click smoothly and satisfyingly into place, making it incredibly easy to rapidly dial your code even if you are in a rush or wearing light work gloves.

Do you offer trade pricing for construction companies?

Yes, Freshway Supplies provides highly competitive volume pricing and trade accounts for construction firms, remote utility sites, and facility managers ordering bulk cartons of combination locks. Contact us to establish your account.

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