Lockout Tagout Locks vs Standard Padlocks: OSHA Requirements and Uses

A padlock used for lockout/tagout is not simply a security lock placed on industrial equipment. It must be dedicated to hazardous energy control and meet OSHA requirements for durability, standardization, substantial construction, and employee identification.

A standard padlock may look similar to a lockout tagout padlock, but appearance alone does not make it suitable for LOTO. Under OSHA 29 CFR 1910.147, a lockout device must be singularly identified, used only for controlling energy, durable, standardized, substantial, and identifiable. Purpose-built LOTO locks help employers meet those requirements while supporting the identification and key-control practices established in the employer’s energy control program.

Key Takeaways

• LOTO locks are dedicated to hazardous energy control, while standard padlocks are generally used to protect property or restrict access.

• OSHA requires lockout devices to be singularly identified, used only for energy control, durable, standardized, substantial, and identifiable.

• Nonconductive bodies, key-retaining cylinders, different shackle options, and specialized keying systems are useful LOTO padlock features, but OSHA does not require every lock to have every feature..

• The employer’s energy control procedure should define how LOTO locks are assigned, identified, controlled, applied, and removed.

What Are Lockout Tagout Locks?

Lockout tagout locks, also known as lock out tag out locks, are specialized safety devices designed to prevent the unauthorized or accidental operation of machinery or equipment during maintenance or repair procedures. These locks are a crucial component of lockout/tagout (LOTO) programs, which are implemented to ensure worker safety by controlling hazardous energy sources. When used as lockout devices, these locks must meet the applicable requirements of the employer’s energy control program and OSHA’s lockout/tagout standard.

Common LOTO Padlock Configurations and Features

LOTO padlocks are available with different keying systems, locking mechanisms, materials, and shackle configurations. These options help employers match the padlock to their energy control procedure and work environment.

• Safety padlocks: Purpose-built safety padlocks commonly use a lightweight thermoplastic body, a corrosion-resistant shackle, high-visibility colors, and a label or marking area for employee identification.

• Keying systems: Keyed-different, keyed-alike, keyed-alike unlimited, and master-keyed systems control which keys open which locks. The employer must select and manage the system so it does not undermine the protection provided by its energy control procedure.

• Key-retaining padlocks: The key cannot be removed while the padlock is open, which helps prevent an unlocked padlock from being left at the isolation point. Key retention is a useful feature, not a requirement stated in 29 CFR 1910.147(c)(5).

• Shackle options: Standard, long, and other shackle configurations provide different clearance, fit, corrosion-resistance, or electrical properties. Selection should reflect the lockout point and the hazards in the environment.

What Are Standard Padlocks?

Standard padlocks, on the other hand, are general-purpose locks commonly used for securing gates, sheds, storage containers, and other applications. Unlike lockout tagout locks, standard padlocks are not specifically designed for industrial safety purposes but rather for general security needs in everyday situations.

Standard padlocks vary in material, size, security level, and locking mechanism, but they are generally selected to protect property or restrict access. Those uses do not require the same dedicated energy-control purpose, employee identification, or facility standardization expected of a lockout device under an employer’s LOTO program.

LOTO Lock vs Standard Padlock: Key Differences

Purpose and Applications

Lockout tagout locks are specifically designed and used in industrial and commercial settings to protect workers during maintenance, repair, or servicing of machinery and equipment. Their primary purpose is to prevent the unexpected energization or start-up of machines, or the release of stored energy, which could cause injury to workers. Lock out tag out locks are an integral part of LOTO procedures mandated by safety regulations.

Standard padlocks have a broader role in everyday security, including protecting property and restricting access. A padlock used as a lockout device, however, must be dedicated to energy control and meet the employer’s requirements for durability, standardization, substantial construction, and identification. A general-purpose padlock that remains in ordinary security service should not be used interchangeably as an employee’s LOTO lock.

Features

LOTO padlocks commonly use high-visibility colors and a label or marking area that can identify the employee who applied the lock. Employers may also use color, shape, or size to standardize lockout devices within the facility, but OSHA does not assign a universal meaning to any specific lock color.

Standard padlocks may offer weather resistance, cut resistance, or other security features, but those qualities do not establish that the lock is suitable for LOTO. The lock must be selected, identified, standardized, maintained, and used as part of the employer’s energy control program.

Material Used

The material of a LOTO padlock should remain durable in the environment where it will be used. Thermoplastic bodies, stainless steel shackles, nonconductive components, and corrosion-resistant materials can address different electrical, chemical, temperature, moisture, or fit conditions.

Standard padlocks are commonly made from brass, steel, or aluminum and may be durable for their intended security application. Material alone does not determine LOTO suitability: the employer must evaluate the environment, the lockout point, and the complete device requirements under its energy control program. For a closer comparison of materials, shackle configurations, identification methods, and keying options, see our guide to selecting safety lockout padlocks.

Benefits

Lockout tagout locks help protect employees by securing energy-isolating devices against unexpected energization, start-up, or release of hazardous energy during servicing. Required identification and facility standardization also help employees recognize devices being used for hazardous energy control.

Standard padlocks offer broad utility for property and access security, including lockers, gates, storage areas, and equipment. Features such as cut resistance, weather resistance, or higher-security locking mechanisms may improve their performance for those purposes, but they do not by themselves make a padlock suitable for lockout/tagout. A padlock used as a lockout device must satisfy the applicable OSHA device requirements and be dedicated to hazardous energy control.

Comparison of LOTO Locks and Standard Padlocks

Lockout Tagout Locks in LOTO Safety

Lockout locks are important in LOTO safety procedures, therefore it is essential to understand how to properly use these locks and to know the regulations governing them.

How LOTO Locks Fit Into the Energy Control Procedure

LOTO locks are applied to energy-isolating devices, or to compatible lockout devices placed on them, according to the employer’s documented energy control procedure. After the equipment is shut down and its energy sources are isolated, the authorized employee applies the required lockout devices, controls stored or residual energy, and verifies that isolation and deenergization have been accomplished before servicing begins. For the full sequence, see our lockout tagout procedure guide.

Standards and Requirements for Lockout Tagout Locks

In the United States, OSHA 29 CFR 1910.147, The Control of Hazardous Energy (Lockout/Tagout), establishes requirements for controlling hazardous energy during servicing and maintenance. Under 1910.147(c)(5), lockout and tagout devices must be singularly identified, used only for controlling energy, and meet the following criteria:

• Durable: The devices must withstand the environment to which they are exposed for the maximum period of expected exposure.

• Standardized: Lockout and tagout devices must be standardized within the facility by color, shape, or size. Tagout devices must also be standardized by print and format.

• Substantial: A lockout device must be substantial enough to prevent removal without excessive force or unusual techniques, such as using bolt cutters or other metal-cutting tools.

• Identifiable: Lockout and tagout devices must indicate the identity of the employee applying the device.

OSHA does not state in 1910.147(c)(5) that every lock must be individually keyed, nonconductive, or key retaining. Those features and keying arrangements should be selected and controlled so they support the employer’s procedure and do not weaken each authorized employee’s protection.

The employer must also train employees on the energy control program and conduct a periodic inspection of each energy control procedure at least annually. That inspection requirement is separate from routine checks of the physical condition of locks and other hardware.

It's important to note that while these standards provide a framework for the use of lockout tagout locks, they also emphasize the need for customized procedures tailored to specific equipment and workplace conditions. Employers are responsible for assessing their unique hazards and developing comprehensive LOTO programs that effectively protect workers from the risks associated with hazardous energy.

Employers must inspect their energy control procedures at least annually and correct any deviations or inadequacies identified. Retraining is also required when job assignments change, machines, equipment, or processes introduce a new hazard, energy control procedures change, or inspections reveal deficiencies in employees’ knowledge or use of those procedures.

Where to Buy Lockout Tagout Locks

When purchasing LOTO padlocks, select products whose construction, identification, keying, and shackle configuration fit the workplace environment and the employer’s energy control procedure. TRADESAFE offers lockout tagout locks designed for industrial energy-control applications.

TRADESAFE Lockout Tagout Locks are available in various keying systems (keyed different, keyed alike, keyed alike unlimited, and master keyed) and come in 8 distinct colors for easy identification. Each premium-grade lock features a corrosion-resistant stainless steel shackle, a non-conductive thermoplastic unibody, and a key-retaining brass core cylinder, making them ideal for industrial environments.

Each lock includes write-on labels in English, Spanish, and French, enhancing communication across diverse workforces. These features support lock identification, key management, and durability within a properly developed energy control program.

FAQs

What are the locks used in LOTO?

LOTO commonly uses personal safety padlocks to secure an energy-isolating device or a compatible lockout device in the safe position. Valve, circuit breaker, plug, and cable lockouts are devices designed for particular isolation points; they are not all types of padlocks. The equipment and hazardous energy sources determine which devices are needed.

What are the requirements for a lockout tagout lock?

Under 29 CFR 1910.147(c)(5), lockout devices must be singularly identified, used only for controlling energy, durable, standardized, substantial, and identifiable. Standardization may be by color, shape, or size, and the device must indicate the identity of the employee applying it. Keying, materials, and other features should also fit the employer’s procedure and the environment of use.

Can you use any lock for lockout tagout?

OSHA does not require a particular brand or product label, but an ordinary padlock taken from general security use should not be used interchangeably as a LOTO lock. Once selected as a lockout device, the padlock must be dedicated to energy control and meet the applicable durability, standardization, substantiality, and identification requirements. It must also be managed and used according to the employer’s energy control procedure.

Why are LOTO locks different colors?

Employers may use colors to standardize LOTO locks or distinguish roles, departments, contractors, or other program categories. OSHA does not assign universal meanings to red, blue, yellow, or other lock colors. Each facility should define its color system and apply it consistently.