| Primary Lockout Padlock Types |
| Non-conductive nylon or thermoplastic padlock | Polymer body with a nylon or polymer shackle; commonly supplied with a compact lock body and a keyed cylinder. | Reduces the likelihood of creating a conductive path when the lock contacts energized equipment. It is not a substitute for de-energization, isolation, verification, or an electrical risk assessment. | Good resistance to many cleaning chemicals and moderate outdoor exposure. Polymer components may degrade under prolonged ultraviolet exposure, heat, or aggressive chemicals. | Electrical maintenance, control panels, distribution equipment, laboratories, and general lockout/tagout programs where non-conductive construction is preferred. | IP protection is not inherent in the material. Use only a model with a documented IP test result if dust or water ingress protection is required. |
| Aluminum-body safety padlock | Lightweight aluminum body, usually with a hardened steel or coated shackle and a restricted-key cylinder. | The aluminum body is electrically conductive. It should not be treated as an electrically insulated lock unless the complete product has been specifically tested and documented for that purpose. | Low weight and generally good corrosion resistance, although untreated aluminum and the shackle may be affected by salt, moisture, or incompatible chemicals. | General industrial isolation, valve lockout, machinery maintenance, and applications where low weight and clear identification are important. | Seals and keyway protection vary by design. A stated IP rating must apply to the complete assembled padlock, not only to the body material. |
| Steel-body safety padlock | Painted, plated, or coated steel body with a hardened steel shackle. | Steel is conductive. This type should be kept away from energized parts and used only within an established isolation procedure unless a specific electrical-safety assessment permits otherwise. | High mechanical strength. Corrosion resistance depends on the coating, drainage, maintenance, and exposure conditions. | Heavy-duty machinery, outdoor industrial equipment, construction, utilities, and areas requiring greater resistance to impact or tampering. | Many steel padlocks have no formal IP rating. Coatings can improve corrosion resistance but do not establish an IEC 60529 rating. |
| Stainless-steel padlock | Stainless-steel body and shackle, often with corrosion-resistant internal components. | Stainless steel is electrically conductive. It provides mechanical and corrosion benefits, not electrical insulation. | Very good resistance to rust and many wet or corrosive environments. Performance still depends on the stainless-steel grade, chloride exposure, crevices, and maintenance. | Food processing, marine areas, wastewater facilities, chemical plants, outdoor equipment, and washdown-prone locations. | Stainless construction does not automatically mean IP-rated construction. Confirm the complete product’s declared IP code and test documentation. |
| Brass-body safety padlock | Brass body with a brass or steel shackle and a conventional mechanical cylinder. | Brass is electrically conductive. It should not be selected as an insulating lock for electrical isolation. | Good resistance to many atmospheric conditions, but surface tarnishing and galvanic effects may occur in specific environments. | General industrial lockout, indoor equipment, moderate-corrosion environments, and applications where a traditional metal body is suitable. | Traditional brass padlocks commonly lack a formal IP rating unless the manufacturer has tested and declared one for the assembled product. |
| Weather-resistant sealed padlock | Metal or polymer body with a protected shackle entrance, keyway cover, seals, or drainage features. | Electrical safety depends on the body and shackle materials. Weather sealing alone does not make a conductive padlock electrically safe. | Designed to reduce dust, rain, splash, and temporary water exposure. Long-term performance depends on seal condition and correct use. | Outdoor switchgear, construction sites, utility enclosures, plant rooms, and equipment exposed to rain or washdown. | Prefer a clearly stated IP code tested to IEC 60529. Verify whether the rating covers the keyway, shackle opening, and the padlock in its normal operating position. |
| High-visibility safety padlock | Brightly colored polymer, coated metal, or anodized body with identification space and a dedicated key system. | Visibility improves lock identification and reduces accidental removal. Electrical insulation depends on the actual materials and documented testing, not on color. | Color stability, coating durability, and weather resistance vary. Ultraviolet exposure may fade polymer or coated surfaces. | Personal lockout, group lockout, multi-worker maintenance, and facilities requiring clear ownership identification. | Color and identification features have no relationship to IP protection. Check the declared IP code separately. |
| IEC 60529 IP Code Reference for Lockout Padlock Selection |
| IP54 | First digit 5: dust-protected. Second digit 4: protected against water splashing from any direction. | Does not indicate electrical insulation, dielectric strength, explosion protection, or safe contact with energized conductors. | Suitable for limited dust and splash exposure when the complete padlock has been tested to this rating. | Indoor industrial areas, sheltered outdoor locations, and equipment exposed to occasional splashing. | Basic dust and splash protection |
| IP55 | First digit 5: dust-protected. Second digit 5: protected against water jets from any direction. | IP55 remains an ingress rating only; it is not an electrical safety certification. | More suitable than IP54 for stronger spray or hose-directed water, subject to the test conditions and product design. | Industrial areas with routine cleaning or moderate water spray. | Dust-protected and water-jet protected |
| IP65 | First digit 6: dust-tight. Second digit 5: protected against water jets from any direction. | Does not prove that the padlock is non-conductive or suitable for energized electrical work. | Strong protection against dust ingress and water jets when the complete lock, including its keyway and seals, meets the rating. | Dusty manufacturing areas, outdoor electrical enclosures, and washdown-prone industrial locations. | Dust-tight and water-jet protected |
| IP66 | First digit 6: dust-tight. Second digit 6: protected against powerful water jets. | Ingress protection does not establish dielectric insulation, touch protection, or suitability for hazardous locations. | Appropriate for harsher dust and powerful water-jet exposure than IP65, provided the lock is installed and maintained as tested. | Outdoor equipment, heavy industrial washdown areas, and severe dust environments. | Dust-tight and protected against powerful water jets |
| IP67 | First digit 6: dust-tight. Second digit 7: protected against temporary immersion in water under specified test conditions. | Temporary immersion protection does not make a padlock electrically safe or suitable for submerged energized equipment. | Suitable for accidental or temporary immersion within the limits defined by the test. It is not automatically equivalent to continuous submersion protection. | Flood-prone areas, outdoor utility equipment, and locations where brief immersion is possible. | Dust-tight and temporarily immersion-protected |
| IP68 | First digit 6: dust-tight. Second digit 8: protected against continuous immersion under conditions specified by the responsible manufacturer. | IP68 is an ingress rating only and must not be interpreted as an electrical isolation or intrinsic-safety rating. | Intended for continuous or extended immersion only within the depth, duration, temperature, and other conditions stated for the tested product. | Specialized marine, wastewater, flood-exposed, or submerged equipment applications. | Dust-tight and continuously immersion-protected under specified conditions |
| No declared IP rating | Any body and shackle construction without a published IEC 60529 test result. | Do not infer electrical insulation or environmental protection from appearance, color, material, or marketing terms such as “weatherproof.” | Use only after evaluating the actual dust, moisture, chemical, temperature, and corrosion conditions. | Dry indoor areas where ingress protection is not a defined selection requirement. | Not classified under IEC 60529 |
