Pinch point hazard

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Pinch point hazards may be present with pulleys. For example, if fingers get caught between the moving belt and the pulley wheel. Timingmarks.jpg
Pinch point hazards may be present with pulleys. For example, if fingers get caught between the moving belt and the pulley wheel.

A pinch point or pinch point hazard is a common class of mechanical hazard where injury or damage may be done by one or more objects moving towards each other, crushing or shearing whatever comes between them. [1] A nip point is a type of pinch point involving rotating objects, such as gears and pulleys. [2] Injuries can range from minor such as blisters to severe like amputations and fatalities. [3] Examples of pinch point hazards include gaps in closing doors and objects swinging or being lowered near fixed objects. [4]

Contents

Common causes of injuries

The NIOSH Hierarchy of Controls. NIOSH's "Hierarchy of Controls infographic" as SVG.svg
The NIOSH Hierarchy of Controls.

Safety controls

A hazard sign is an example of an administrative control Danger Pinch Point Hazard sign.jpg
A hazard sign is an example of an administrative control

Pre-work hazard inspections can be performed to identify pinch point hazards. These hazards can be managed with control methods, listed below according to the hazard control hierarchy. [1] The hazard control hierarchy was created by the National Institute of Occupational Safety and Health (NIOSH [5] ).

Engineering controls physically prevent objects from entering the pinch point. These are systems and devices designed (Engineered) that cover pinch point hazards to limit worker exposure. The shape and coverage of engineering controls to protect against pinch points varies with the machine involved. Rotating parts including rollers, chains, gears/sprockets, drives, and conveyors all pose pinch points and can be found across many industries. [6]

Administrative controls inform worker behavior to avoid pinch points.

Personal protective equipment protects individuals exposed to the hazard by preventing objects from being pinched. [1]

Signage and labeling

In the U.S., the Occupational Safety and Health Administration regulates accident preventions signs under 29 CFR 1910.145. [7] This standard sets requirements of signage including design and features, Classifications, types of signage, and others. With this, signs are required to have "Signal Words", key terms used to directly and correctly identify the hazard present.

The signal word "Pinch point" is required to be posted on a label when a piece of equipment or machinery has parts that move in opposite directions or move towards a fixed object. This label should meet the following criteria in order to be considered effective:

  1. Must be visible and easy to understand using simple fonts and bright colors to attract attention.
  2. Must be direct and clear in its wording. Phrases like "Keep hands away" or "Pinch Point Hazard" are common, though other wording is acceptable.
  3. Based on guidance from 29 CFR 1910.145, the signage must indicate a level of danger. "DANGER", "CAUTION", or "WARNING" are common key words used to detail a machines pinch point hazard.
    An example of an ISO pinch point label. Big guy637's Safety sign W007a.svg
    An example of an ISO pinch point label.

The International Standards Organization (ISO) details the hazard of pinch points and signage requirements under "ISO 13857: Safety of machinery — Safety distances to prevent hazard zones being reached by upper and lower limbs". [8] This standard, similar to 29 CFR 1910.145, details machine and equipment design as it relates to worker proximity. Measurements are taken to quantify where the worker's limbs are located relative to the machine's point of operation. These measurements are then taken into consideration as controls are implemented to ensure that the worker's limbs are sufficiently distant as per the standard.

Machinery point of operation

The point of operation of a machine is where the work is performed by it. OSHA details that there are 4 main operations that can be performed under 29CFR 1910. 212. Forming, Shaping, Cutting, and Boring make up these categories. [9] Each machine requires its own machine guarding to sufficiently protect against pinch point hazards.

An example of machine guarding using the AUTO method. Point Guarding.jpg
An example of machine guarding using the AUTO method.

To accomplish this, the "AUTO" method is often used. referring to. The word "AUTO" is an acronym containing four parts as requirements for machine guarding. These four parts include "Around", "Under", "Through", and "Over". "Around" details the ability for a worker to reach easily around the guarding implemented, exposing them to the hazard. "Under" is regarding the ability for a worker to reach underneath a guard, exposing to the hazard. "Through" describes the if a worker is able to reach through a guard, exposing them to the hazard. "Over" is the opposite of "Under", being able to reach over the guard. [10]

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See also

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 "Causes and controls for preventing pinch point injuries". Industrial Safety and Hygiene News. 9 February 2018. Retrieved 8 August 2020.
  2. 1 2 "Woodworking eTool | Machine Hazards > Nip Points". www.osha.gov. Retrieved 2020-10-22.
  3. ↑ Environmental Health and Safety. "WVU Pinch Point Hazards" (PDF). West Virginia University. Retrieved 15 October 2020.
  4. ↑ Middle Georgia State University. "Pinch Points: Safety Training" (PDF). Retrieved 3 October 2020.
  5. ↑ CDC (2025-08-13). "National Institute for Occupational Safety and Health". National Institute for Occupational Safety and Health (NIOSH). Retrieved 2025-09-18.
  6. ↑ "Mechanical Hazards: Pinch Points - Safety, Health and Wellness in Agriculture". 2025-05-14. Retrieved 2025-09-18.
  7. ↑ "1910.145 - Specifications for accident prevention signs and tags. | Occupational Safety and Health Administration". www.osha.gov. Archived from the original on 2025-09-05. Retrieved 2025-09-16.
  8. ↑ "ISO 13857:2019". ISO. Retrieved 2025-09-16.
  9. ↑ U.S. Department of Labor (1971-03-29). "Machine Guarding - Standards". Occupational Safety and Health Administration. Retrieved 2025-09-17.
  10. ↑ "Requirements for Safeguards". Occupational Safety and Health Administration. U.S. Department of Labor. 2025-09-17. Retrieved 17 September 2025.
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