ISO 7010 Mandatory Signs: Complete M-Series PPE Guide
Blue circle mandatory action signs with OSHA PPE references and placement guidance
Last updated: March 16, 2026
Overview
The ISO 7010 M-series defines mandatory action signs used to indicate personal protective equipment (PPE) requirements and other compulsory actions in workplaces. Each sign uses a blue circle with a white pictogram, a format recognized internationally regardless of language. For the full ISO 7010 standard covering all sign categories (prohibition, warning, mandatory, emergency, and fire equipment), see our complete ISO 7010 safety signs guide.
OSHA does not mandate ISO 7010 pictograms specifically, but 29 CFR 1910.145 requires employers to post signs where specific hazards or PPE requirements exist. ISO 7010 mandatory signs satisfy this requirement. The underlying PPE obligations come from the hazard assessment required under 29 CFR 1910.132, which determines what equipment workers must wear in each area.
This guide covers the 10 most relevant M-series signs for US workplaces, maps each to the OSHA standard that drives the requirement, and provides a facility matrix to help you determine which signs your site needs.
ISO 7010 M-Series Mandatory Action Signs
Each mandatory sign uses a blue circle with a white pictogram. The blue background indicates a required action, telling workers what they must do before entering an area.
M001: General mandatory action
Entrances to areas where a specific mandatory action is required but no specific sign exists
OSHA 29 CFR 1910.145 (specifications for accident prevention signs)
M002: Refer to instruction manual
On or near equipment that requires operators to read instructions before use
OSHA 29 CFR 1910.145, equipment-specific standards
M003: Wear ear protection
Entrances to areas exceeding 85 dBA noise exposure (8-hour TWA)
OSHA 29 CFR 1910.95 (occupational noise exposure)
M004: Wear eye protection
Entrances to grinding, cutting, welding, chemical handling, and laboratory areas
OSHA 29 CFR 1910.133 (eye and face protection)
M008: Wear safety footwear
Entrances to areas with heavy objects, sharp materials, or wet/slippery floors
OSHA 29 CFR 1910.136 (foot protection)
M009: Wear protective gloves
Chemical handling stations, sharp material areas, hot work zones
OSHA 29 CFR 1910.138 (hand protection)
M010: Wear protective clothing
Areas with chemical splash, biological hazard, or contamination risk
OSHA 29 CFR 1910.132 (general PPE requirements)
M014: Wear head protection
Construction sites, loading docks, areas with overhead hazards
OSHA 29 CFR 1910.135 (head protection)
M015: Wear high-visibility clothing
Areas with vehicle or equipment traffic where pedestrian visibility is critical
OSHA 29 CFR 1926.651 (specific excavation), ANSI/ISEA 107 (high-visibility)
M017: Wear respiratory protection
Entrances to areas with airborne contaminants above permissible exposure limits
OSHA 29 CFR 1910.134 (respiratory protection)
Common Mandatory PPE Signs Under ISO 7010
Most US workplaces need a subset of the full M-series. These five signs cover the PPE requirements found in the majority of industrial and commercial facilities.
M014: Wear Head Protection
The most widely posted mandatory sign on construction sites and in warehouses. Required wherever there is a risk of head injury from falling objects or overhead hazards. OSHA 1926.501 (fall protection) addresses the broader fall protection framework that often accompanies hard hat requirements. Mount the sign at every entrance to areas where head protection is mandatory.
M004: Wear Eye Protection
Required at entrances to areas where grinding, cutting, welding, or chemical handling creates eye hazards. OSHA 29 CFR 1910.133 requires employers to provide eye protection where there is reasonable probability of injury. OSHA 1926.1153 (respirable crystalline silica) also mandates eye protection for workers exposed to silica dust during cutting and grinding operations.
M017: Wear Respiratory Protection
Posted at entrances to areas where airborne contaminants exceed permissible exposure limits. OSHA 1910.134 establishes the comprehensive respiratory protection standard, including fit testing, medical evaluation, and program administration. See our respirator fit testing guide for practical implementation steps.
M003: Wear Ear Protection
Required at entrances to areas where noise exposure exceeds 85 dBA over an 8-hour time-weighted average. OSHA 29 CFR 1910.95 requires employers to implement a hearing conservation program at this threshold, including providing hearing protection, annual audiometric testing, and posting warning signs at noisy areas.
M015: Wear High-Visibility Clothing
Posted at entrances to areas with vehicle or equipment traffic where pedestrian visibility is critical. ANSI/ISEA 107 defines the performance classes for high-visibility safety apparel. Common in construction zones, warehouse aisles with forklift traffic, roadwork areas, and parking operations.
Which ISO 7010 Mandatory Signs Does Your Facility Need?
This matrix maps the most relevant M-series signs to common facility types. "Required" means an OSHA standard mandates the underlying PPE and its identification at the point of hazard. "Recommended" means the PPE is commonly needed but depends on the specific hazard assessment for your site.
| Facility Type | M003 | M004 | M008 | M009 | M010 | M014 | M015 | M017 |
|---|---|---|---|---|---|---|---|---|
| Construction Site | Rec | Req | Req | - | - | Req | Req | Rec |
| Warehouse / Distribution | Rec | Rec | Req | - | - | Req | Req | - |
| Manufacturing | Req | Req | Req | Rec | - | Rec | - | Rec |
| Laboratory | - | Req | - | Req | - | - | - | Rec |
| Restaurant / Kitchen | - | - | Rec | Rec | - | - | - | - |
| Healthcare | - | Rec | - | Req | Rec | - | - | - |
| Office Building | - | - | - | - | - | - | - | - |
= Required by OSHA
= Recommended
Sign Materials
ISO 7010 mandatory signs are available in several substrate options. The right choice depends on the installation environment and durability requirements.
| Material | Best For | Durability | Notes |
|---|---|---|---|
| Self-adhesive vinyl | Indoor, temporary, low-traffic | 1 to 3 years | Lowest cost, easy to apply and replace |
| Rigid PVC | Indoor permanent installations | 5 to 10 years | Lightweight, screw or adhesive mount |
| Aluminum | Outdoor, high-traffic, industrial | 10+ years | Weather-resistant, most durable |
| Photoluminescent | Egress-adjacent, power-failure visibility | 10+ years | Glows in dark per UL 1994, useful in tunnels and confined spaces |
ISO 7010 vs ANSI Z535 for Mandatory/PPE Signs
In the US, PPE requirement signs traditionally follow ANSI Z535 with English text headers ("HARD HAT AREA," "EYE PROTECTION REQUIRED"). ISO 7010 replaces text with standardized blue circle pictograms that work across languages. Both approaches are accepted by OSHA, and many facilities now use them together: ISO pictograms for universal recognition plus ANSI text for explicit clarity.
For a detailed side-by-side comparison of the two systems across all sign categories, see the ISO 7010 vs ANSI Z535 comparison in our main ISO 7010 guide.
Frequently Asked Questions
What does a blue circle safety sign mean?
Blue circle signs with white pictograms indicate mandatory actions. They tell you what personal protective equipment (PPE) you must wear or what actions you must take before entering an area. Examples: wear eye protection, wear hard hat, wear hearing protection.
Which PPE signs does OSHA require?
OSHA does not mandate ISO 7010 specifically, but 29 CFR 1910.145 requires employers to post signs identifying required PPE at hazardous locations. ISO 7010 mandatory signs satisfy this requirement. The specific PPE required depends on the hazard assessment performed under 29 CFR 1910.132.
Can I use mandatory signs instead of posting written PPE policies?
Signs supplement but do not replace written hazard communication. OSHA requires both: a written PPE hazard assessment (29 CFR 1910.132(d)) identifying required equipment, AND visible signs at point of hazard. Mandatory signs provide instant visual reinforcement at the location where PPE must be worn.
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