Master Lock® 420 Steel Safety Lockout Hasp | 6 Hole | 25mm Jaw | 0420

Heavy-Gauge Steel Six-Padlock Safety Hasp for Group Lockout/Tagout and Equipment Isolation Procedures

Supply Solutions Group supplies the Master Lock® 420 Steel Safety Lockout Hasp – 25mm Jaw, 6 Hole (Model 420 / 0420) to organisations operating across mining, manufacturing, engineering, construction, utilities, transport, facilities management and industrial workplaces throughout Australia.

The Master Lock No. 420 Steel Safety Lockout Hasp is designed for group lockout/tagout applications, allowing multiple workers to apply their individual safety padlocks to a single isolation point.

The hasp features a 25mm inside jaw diameter and accommodates up to six safety padlocks, making it particularly useful where several employees or contractors are working on the same isolated equipment.

During a group lockout procedure, the hasp is attached to the appropriate energy-isolation point and each authorised worker applies their own safety padlock.

The isolation point remains secured while any worker's padlock remains attached.

Master Lock specifically designs the No. 420 so that the equipment or control cannot be returned to operation until the last worker's safety padlock has been removed from the hasp.

This provides a straightforward physical method of supporting group isolation procedures during maintenance, servicing, adjustment and repair work.

The No. 420 is manufactured with a heavy-gauge steel jaw, providing the robust construction required for professional industrial lockout applications.

A distinctive red vinyl-coated handle provides improved visibility and handling while helping identify the device as part of a workplace safety lockout system.

The hasp measures approximately 44mm wide × 114mm long, providing a compact format that can be stored in lockout stations, maintenance toolboxes, service vehicles and personal isolation kits.

Its 25mm inside jaw diameter provides clearance for attachment to compatible isolation points.

The six padlock positions allow up to six authorised personnel to independently secure the same isolation point.

Each worker retains control of their own safety padlock according to the organisation's lockout/tagout procedure.

This makes the Master Lock 420 particularly useful during multi-person maintenance, plant shutdowns, machinery servicing, electrical isolation and mechanical isolation activities where more than one employee may be exposed to hazardous energy.

This listing contains 1 × Master Lock 420 Steel Safety Lockout Hasp with 25mm jaw clearance and six-padlock capacity.

Safety padlocks are not included unless specifically stated and should be selected separately according to the organisation's isolation and lockout/tagout requirements.

As an Indigenous-owned industrial and workplace safety supplier, Supply Solutions Group provides Master Lock lockout/tagout equipment, safety padlocks, isolation devices, tags, lockout stations, PPE and industrial safety products backed by responsive customer service, procurement support and Australia-wide business supply capability.

Product Type

• Product Type: Safety Lockout Hasp

• Brand: Master Lock®

• Model: 420

• Australian Reference: 0420

• Material: Heavy-Gauge Steel

• Handle: Red Vinyl Coated

• Inside Jaw Diameter: 25mm

• Padlock Capacity: Up to 6 Safety Padlocks

• Overall Width: Approx. 44mm

• Overall Length: Approx. 114mm

• Maximum Padlock Shackle Diameter: Approx. 7mm

• Colour: Red / Steel

• Primary Application: Group Lockout/Tagout

• Padlocks Included: No

• Primary Use: Machinery & Equipment Isolation

Key Features

• Genuine Master Lock® safety product

• Model 420

• Australian reference 0420

• Steel safety lockout hasp

• Heavy-gauge steel jaw

• Red vinyl-coated handle

• 25mm inside jaw diameter

• Six padlock positions

• Holds up to six safety padlocks

• Designed for group lockout

• Designed for lockout/tagout procedures

• Allows multiple workers to secure one isolation point

• Equipment remains isolated while padlocks remain attached

• Control cannot be returned to operation until the final worker's padlock is removed

• Suitable for maintenance activities

• Suitable for machinery servicing

• Suitable for repair activities

• Suitable for equipment adjustments

• Suitable for plant shutdowns

• Suitable for electrical isolation procedures

• Suitable for mechanical isolation procedures

• Compact professional format

• Approx. 44mm wide

• Approx. 114mm long

• Accepts compatible safety-padlock shackles up to approximately 7mm

• Suitable for industrial workplaces

• Suitable for personal isolation systems

• Suitable for lockout stations

• Reusable lockout device

Technical Specifications

Specification Details
Brand	Master Lock®
Product	Steel Safety Lockout Hasp
Model	420
Australian Reference	0420
Product Type	Group Lockout Hasp
Material	Heavy-Gauge Steel
Handle Material	Vinyl Coated
Handle Colour	Red
Inside Jaw Diameter	25mm
Padlock Capacity	Up to 6
Overall Width	44mm
Overall Length	114mm
Hasp Length	114mm
Maximum Accepted Padlock Shackle Diameter	Approx. 7mm
Group Lockout Suitable	Yes
Lockout/Tagout Suitable	Yes
Reusable	Yes
Padlocks Included	No
Primary Application	Hazardous Energy Isolation

Typical Applications

• Group lockout/tagout

• Machinery isolation

• Equipment isolation

• Electrical isolation

• Mechanical isolation

• Maintenance shutdowns

• Plant servicing

• Equipment repairs

• Machinery adjustments

• Preventative maintenance

• Industrial maintenance

• Multi-worker maintenance

• Contractor isolation

• Production-line maintenance

• Plant shutdown procedures

• Workshop isolation

• Energy-control procedures

• Lockout stations

• Personal isolation systems

• Safety-management programs

Suitable Industries

• Mining and resources

• Manufacturing

• Engineering

• Construction

• Utilities

• Power generation

• Oil and gas

• Transport and logistics

• Heavy equipment

• Industrial maintenance

• Mechanical workshops

• Electrical contracting

• Infrastructure

• Facilities management

• Processing plants

• Metal fabrication

• Agriculture

• Equipment manufacturing

• Government

• Trades and contracting

Why Choose Master Lock® 420 Steel Safety Lockout Hasp?

The Master Lock 420 provides a straightforward solution for group isolation situations where multiple workers need independent control over the same hazardous-energy isolation point.

A standard safety padlock allows one authorised worker to secure an isolation point.

However, maintenance activities frequently involve several employees or contractors working on the same machinery or equipment.

In these situations, a lockout hasp allows multiple personal safety padlocks to be attached to the same isolation point.

The Master Lock 420 provides six individual padlock positions, allowing up to six workers to participate in the group lockout.

Each worker can attach their own safety padlock and retain control of their key according to workplace procedures.

The equipment remains isolated while any padlock remains attached.

Master Lock specifically states that the control cannot be turned on until the last worker's safety padlock is removed from the hasp.

This provides an important physical safeguard during multi-person maintenance operations.

The hasp is constructed from heavy-gauge steel, providing durability for demanding industrial environments.

Its red vinyl-coated handle provides clear visual identification and practical handling.

With a 25mm inside jaw diameter, the hasp is suitable for compatible isolation points requiring this clearance.

The compact 44mm × 114mm overall dimensions also make the device easy to incorporate into existing lockout kits, stations and maintenance equipment.

Six-Padlock Group Lockout Capacity

The Master Lock 420 can accommodate up to six individual safety padlocks.

This allows multiple authorised workers to independently secure one isolation point.

A typical group-lockout sequence may involve:

1. Identifying the hazardous energy source.

2. Shutting down equipment according to workplace procedures.

3. Isolating the relevant energy source.

4. Applying the Master Lock 420 hasp to the compatible isolation point.

5. Each authorised worker applying their individual safety padlock.

6. Completing the required verification and maintenance procedures.

7. Each worker removing their own padlock when their involvement is complete.

8. Removing the hasp only after all authorised padlocks have been removed and the organisation's restoration procedure has been completed.

Actual procedures must always follow the organisation's documented isolation and lockout/tagout requirements.

25mm Inside Jaw Diameter

The No. 420 features a 25mm inside jaw diameter.

This dimension should be checked against the intended isolation point before purchase.

For larger isolation points, Master Lock manufactures other hasp configurations with different jaw clearances.

Selecting the correct jaw size ensures the hasp can be properly installed without compromising the intended isolation arrangement.

Heavy-Gauge Steel Construction

Industrial lockout devices may be subjected to regular handling, transportation and demanding workplace environments.

Master Lock manufactures the No. 420 with a heavy-gauge steel jaw for professional safety-lockout applications.

The steel construction provides:

• Robust physical construction

• Reusability

• Suitability for regular workplace use

• Reliable support for multiple safety padlocks

• Compatibility with structured lockout/tagout programs

The red vinyl-coated handle provides additional handling comfort and visual identification.

Red Vinyl-Coated Handle

The Master Lock 420 features a distinctive red vinyl-coated handle.

Red is commonly associated with safety isolation and lockout equipment, helping the hasp remain visually identifiable within industrial environments.

The coating also provides a practical gripping surface when workers are installing or removing the hasp.

Group Lockout and Personal Isolation

A lockout hasp does not replace a workplace isolation procedure.

Instead, it provides a physical mechanism that can form part of an organisation's established hazardous-energy control system.

Each worker participating in a group isolation should follow the organisation's procedures regarding:

• Personal safety padlocks

• Individual key control

• Isolation verification

• Lockout tags

• Shift changes

• Contractor management

• Group isolation

• Removal of personal locks

• Return-to-service procedures

Only appropriately trained and authorised personnel should perform lockout/tagout and hazardous-energy isolation activities.

Safety Padlock Compatibility

The Master Lock 420 accepts compatible safety-padlock shackles up to approximately 7mm diameter.

When selecting padlocks, confirm:

• Shackle diameter

• Shackle clearance

• Padlock material

• Keying requirements

• Colour coding

• Worker identification requirements

• Site lockout/tagout procedures

Master Lock offers dedicated safety padlocks designed specifically for industrial lockout/tagout systems.

Important Safety Information

Lockout/tagout equipment forms part of a broader hazardous-energy isolation system.

Users should always:

• Follow applicable workplace health and safety requirements

• Follow the site's documented isolation procedures

• Identify all hazardous energy sources before work begins

• Use appropriately rated isolation equipment

• Verify isolation before commencing work

• Use individual personal safety padlocks where required

• Maintain individual control of padlock keys

• Never remove another worker's personal safety padlock except under an authorised documented procedure

• Confirm that all workers are clear before restoring equipment

• Inspect lockout devices regularly for damage or excessive wear

• Replace damaged isolation equipment

• Ensure personnel are trained and authorised for the applicable procedure

The Master Lock 420 should only be used where its dimensions, material and configuration are appropriate for the intended isolation point.

Why Buy from Supply Solutions Group?

Supply Solutions Group is an Indigenous-owned Australian supplier of lockout/tagout equipment, workplace safety products, PPE, isolation equipment and industrial consumables, providing Master Lock products backed by procurement support and Australia-wide business supply capability.

Benefits of Partnering with Supply Solutions Group

• Australia-wide business supply capability

• Indigenous-owned and operated business

• Master Lock safety product sourcing

• Lockout/tagout equipment

• Safety padlocks

• Lockout hasps

• Electrical isolation devices

• Mechanical isolation equipment

• Lockout stations

• Safety tags

• Isolation kits

• Workplace safety equipment

• PPE and industrial products

• Mining safety supplies

• Manufacturing safety products

• Procurement support services

• Trade account options

• Bulk purchasing solutions

• Product sourcing assistance

• Responsive customer service

• Ongoing commercial supply arrangements

Frequently Asked Questions

What is the Master Lock 420?
The Master Lock 420 is a heavy-gauge steel safety lockout hasp designed to allow multiple workers to apply individual safety padlocks to a single isolation point.

What is the product model?
The manufacturer model is Master Lock 420.

Is 0420 the same product?
Australian distributors may list the product using the reference 0420, while Master Lock identifies the manufacturer model as 420.

How many padlocks can the Master Lock 420 hold?
It can hold up to six safety padlocks.

Is this a six-hole lockout hasp?
Yes. The Master Lock 420 provides positions for up to six individual safety padlocks.

What is the jaw diameter?
The hasp has a 25mm inside jaw diameter.

What are the overall dimensions?
Master Lock specifies dimensions of approximately 44mm wide × 114mm long.

What is the hasp made from?
The No. 420 features a heavy-gauge steel jaw.

What colour is the handle?
The handle is red with a vinyl coating.

What size padlock shackle does it accept?
Master Lock specifies compatibility with padlock shackles up to approximately 7mm diameter.

Are safety padlocks included?
No. This listing is for the lockout hasp only, unless otherwise specifically stated.

What is a lockout hasp used for?
A lockout hasp allows multiple authorised workers to independently secure the same hazardous-energy isolation point using their own personal safety padlocks.

Can one worker restart the equipment while another worker's padlock remains attached?
No. The hasp is designed so the isolation cannot be released while another worker's safety padlock remains attached.

When can the equipment be returned to service?
The hasp can only be released after the last worker's padlock has been removed, and equipment should only be returned to service after the site's complete isolation-removal and restart procedure has been followed.

Is the Master Lock 420 suitable for machinery maintenance?
Yes. Master Lock specifically identifies it for keeping equipment inoperative while repairs or adjustments are being made.

Can it be used for electrical isolation?
It may be used as part of an electrical isolation system where the hasp is compatible with the specific isolation point and site procedure.

Can it be used for mechanical isolation?
Yes, where the physical isolation point is compatible and the organisation's procedure specifies a lockout hasp.

Is it suitable for mine sites?
The Master Lock 420 is suitable for appropriate industrial lockout/tagout systems, including mining environments, subject to site-specific isolation requirements.

Is it suitable for manufacturing facilities?
Yes. It is particularly useful for machinery servicing, production-line maintenance and multi-worker isolation procedures.

Can contractors use the same hasp?
A group lockout hasp can allow multiple authorised employees and contractors to apply individual padlocks where permitted by the site's isolation-management procedure.

Is the hasp reusable?
Yes. The steel hasp is designed as a reusable safety device. It should be inspected before use and replaced if damaged or excessively worn.

Does the hasp itself lock?
The hasp is secured by the individual safety padlocks inserted through its locking positions.

Can I use ordinary padlocks with it?
For workplace isolation, organisations should use padlocks that meet their established lockout/tagout requirements. Dedicated safety padlocks are generally used for personal isolation systems.

Does the Master Lock 420 replace a lockout/tagout procedure?
No. It is a physical safety device used within an established hazardous-energy isolation procedure.

Can Supply Solutions Group provide safety padlocks to suit this hasp?
Yes. Supply Solutions Group can assist with compatible Master Lock safety padlocks, keyed systems and other lockout/tagout equipment.

Can Supply Solutions Group provide larger quantities?
Yes. Bulk and ongoing supply arrangements are available for mine sites, manufacturers, engineering businesses, utilities, construction companies, facilities managers and other commercial customers.

Can Supply Solutions Group supply other Master Lock isolation products?
Yes. Supply Solutions Group can assist with broader requirements for Master Lock safety padlocks, lockout hasps, circuit-breaker lockouts, valve lockouts, lockout stations, tags, group lock boxes and complete lockout/tagout solutions, subject to availability.