American Lock A1107R Safety Lockout Padlock — Red

The American Lock A1107R safety lockout padlock in red is one of the most recognized heavy-duty LOTO padlocks in North American heavy industry. American Lock is Master Lock's dedicated industrial brand, and the A1107R is built accordingly: a steel body rated for demanding industrial environments — foundries, steel mills, heavy manufacturing, mining, and petrochemical facilities — where aluminum-body locks may not provide adequate durability. Red is the standard LOTO warning color and the most widely specified safety padlock color in North American general industry, instantly communicating "this equipment is locked out — do not operate" to any worker who approaches an isolation point.

Key Features

• American Lock A1107R — industrial-grade steel body, Master Lock's heavy-duty LOTO brand
• Red color — standard LOTO warning color, widely specified in OSHA-compliant written programs
• Steel body construction — rated for demanding industrial environments including foundry, mining, and heavy manufacturing
• Hardened steel shackle with heel and toe locking for double-bolt shackle security
• OSHA 29 CFR 1910.147 compliant — durable, substantial, standardized safety padlock
• Patented keyway for key control in safety-critical LOTO programs
• Available keyed-different for personal-lock compliance or keyed-alike for supervisor/group use

Product Specifications

Detailed Description

In the safety padlock market, there are two structural tiers: aluminum-body locks for general industry and light-to-medium manufacturing, and steel-body locks for heavy industrial environments where a lock faces daily abuse from impact, heat, chemical exposure, and physical forces that would deform or compromise a lighter body. American Lock's A1107R is firmly in the second tier — and that is exactly what it is designed for.

American Lock was established as a standalone heavy industrial brand within the Master Lock portfolio specifically because the demands of foundry, steel, mining, petrochemical, and heavy manufacturing environments exceed what general-purpose safety padlocks are designed to withstand. The A1107R's steel body resists impact from dropped tools, maintains dimensional stability at higher ambient temperatures, and does not deform under the incidental physical abuse that lockout points in heavy environments routinely experience. Where an aluminum-body lock might be scratched, dented, or cracked by a glancing tool blow, the A1107R's steel body shrugs it off.

The red color is a deliberate and important safety choice. Red is universally recognized as the warning/danger color in industrial safety signage (ANSI Z535), and in LOTO programs, red is the most commonly assigned color for electrical isolation — the highest-hazard energy type in most facilities. A red lock on a circuit breaker lockout device, a disconnect hasp, or a valve lockout sends an immediate, high-visibility signal to any approaching worker that this equipment is under personal lockout protection and must not be energized.

American Lock specifies a patented keyway on the A1107R, which prevents key duplication at hardware stores and locksmiths outside the authorized American Lock key service network. In a LOTO program where key control is a compliance requirement, patented keyways are an important administrative safeguard — they ensure that duplicate keys cannot be made without authorization, preventing unauthorized lock removal.

The heel-and-toe double-bolt shackle locking mechanism is a security feature that matters for LOTO: both sides of the shackle are engaged by the locking mechanism when the lock is closed, resisting the "shimming" technique and making the lock substantially harder to open without the correct key. This level of tamper resistance goes beyond OSHA's minimum substantive requirements and provides an additional layer of protection at high-value or high-hazard isolation points.

The A1107R can be ordered in keyed-different configuration (standard for personal-lock LOTO) or keyed-alike (for supervisor/safety officer master-key sets). Master Lock and American Lock also offer rekeyable options and grand master key systems for facilities with complex LOTO hierarchy requirements — a capability that few other LOTO padlock brands can match.

Compliance and Standards

• OSHA 29 CFR 1910.147 — Control of Hazardous Energy (Lockout/Tagout)
• Meets and exceeds OSHA substantive requirements: durable, substantial, standardized, and identifiable
• Patented keyway supports key control requirements in safety-critical LOTO written programs
• Compatible with NFPA 70E electrical safety work practices

Real-World Benefits

Safety managers in foundry and heavy manufacturing environments report significantly longer service life from American Lock steel-body padlocks compared to aluminum alternatives. In environments where tool impacts, elevated temperatures, and chemical exposure are routine, steel-body locks maintain their structural integrity and key function without the body deformation that can make aluminum locks difficult to key in and out after extended field use.

The combination of red color, patented keyway, and double-bolt shackle locking gives EHS directors a defensible, auditable answer to the question "what controls do you have in place to prevent unauthorized lock removal?" — the steel body and patented keyway together create a physical and administrative barrier that satisfies both OSHA's lock requirements and a thorough VPP or ISO 45001 safety audit.

Applications and Use Cases

• Foundry and steel mill maintenance where heat and impact exposure is routine
• Mining and extraction operations requiring maximum lock body durability
• Petrochemical and refinery LOTO programs where chemical exposure degrades lighter lock bodies
• Electrical lockout programs using red as the designated electrical-hazard LOTO color
• Facilities requiring patented keyway key control for written LOTO program compliance
• VPP-star sites and ISO 45001-certified facilities requiring documented key-control measures

Related Products

• Shop All Lockout/Tagout Equipment
• ABUS 74/40 Lockout Tagout Padlocks — 10-Pack
• Personal Protective Equipment (PPE)
• Master Lock 410GRN Green Safety Padlock
• TRADESAFE TS1KD10R 10-Pack Red Aluminum LOTO Padlocks

Frequently Asked Questions

What is the difference between American Lock and Master Lock safety padlocks?

American Lock is Master Lock's dedicated heavy-industrial brand, designed for environments that demand heavier steel construction, patented keyways, and industrial-grade durability. Standard Master Lock safety padlocks (such as the 410 series) use lighter-gauge steel bodies and are appropriate for general industry. American Lock A-series padlocks are specified when maximum body strength and key control are required.

Why choose a red LOTO padlock specifically?

Red is the standard danger/warning color in ANSI Z535 safety signage and is the most commonly assigned color for electrical lockout in multi-color LOTO programs. Using red for all LOTO padlocks — or specifically for electrical lockout — makes compliance visible: any red lock on a hasp immediately signals that equipment is under lockout to any worker approaching the area, even before they read a tag or a procedure card.

Is the A1107R available keyed-different or keyed-alike?

The A1107R is available in both keyed-different (standard for personal-lock LOTO) and keyed-alike (for supervisor/group use). American Lock also offers master-keyed systems where individual locks have unique keys but are also openable by a master key held by the safety manager — a more sophisticated key hierarchy for complex LOTO programs.

What is a patented keyway and why does it matter for LOTO?

A patented keyway means the key can only be duplicated through the manufacturer's authorized key service, not at a hardware store or generic locksmith. For LOTO, this is an administrative key-control safeguard — it prevents unauthorized duplicate keys from being made, ensuring that only the authorized worker (and the documented emergency backup) holds a functioning key to the lock.

Can the A1107R be used in chemical or wet environments?

Steel-body locks are more susceptible to rust than aluminum in prolonged wet or chemical environments. American Lock finishes the A1107R body to resist corrosion under typical industrial conditions, but for highly corrosive environments (saltwater, strong acid/alkali exposure), inspect locks regularly and consider an aluminum-body or stainless-steel lock if rust contamination of the locking mechanism is a concern.

How does the heel-and-toe shackle locking work?

Standard padlocks lock only on the heel (one side) of the shackle. Double-bolt heel-and-toe locking engages locking bolts on both sides of the shackle simultaneously when the lock is closed. This prevents the shimming technique (where a thin tool is inserted alongside the shackle to retract a single bolt) and substantially increases resistance to forced opening without the correct key.

Does the A1107R fit standard lockout hasps?

Yes. The A1107R shackle diameter is compatible with standard North American safety hasps from Brady, ABUS, and Master Lock. The steel body is slightly thicker than equivalent aluminum-body padlocks; verify hasp jaw clearance if packing maximum-capacity locks on a multi-lock hasp in a confined space.