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A hole near the end of many rulers is primarily a hanging point, making the tool easier to store on a hook or peg. Family Handyman also traces a historical use to slate-board cleaning cloths and describes specialized ruler holes for binders, drawing and crafts.
A hole near the end of many rulers is mainly there to make the tool easier to hang and store, according to a Family Handyman report. The feature also has a reported classroom history: students once used holes to tie cleaning cloths to rulers used with reusable slate boards.
The simplest purpose is storage. A ruler can be hung from a hook, nail or pegboard, rather than left loose in a drawer or on a work surface. The report says this can be particularly useful for long metal rulers that may be awkward to fit into a toolbox.
Family Handyman describes an earlier use tied to school slate boards. Before paper notebooks became common in classrooms, students practiced writing on slates that could be wiped clean and used again. The report says some students passed a string through the ruler’s hole to keep a damp cleaning cloth close at hand. It does not provide a date for when that practice began or how widely it was used.
Other holes are designed for specific tasks. Some school rulers have three holes spaced to match a three-ring binder. Certain specialty rulers use openings to hold a pin while another hole guides a pencil around a pivot, allowing the ruler to help draw a circle. Craft and quilting rulers can also have openings or slots for marking fabric, guiding cuts or laying out patterns. These functions vary by product; a hole on an ordinary ruler is not necessarily intended for circle drawing.
A Small Feature With Practical Uses
For most people, the explanation is straightforward: the hole provides a way to keep a ruler visible and within reach, rather than buried among other supplies. That can be useful in classrooms, workshops and craft spaces, especially where a longer ruler takes up more room.
The other examples show why the feature is not always interchangeable from one ruler to another. Holes can support storage, binder filing or a specialized measuring task, depending on their number, size and placement. Before using a ruler as a circle guide or cutting template, users should check that its design supports that purpose. The report notes that a compass remains the better choice when precise circle measurements matter.
The holes do not determine whether a basic ruler can measure accurately. According to the report, a ruler without holes can measure just as accurately as one with them. The openings are about convenience or added functions, not an indication of measurement quality.
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From Slate Boards to Storage Hooks
The reported slate-board use predates the modern emphasis on hanging tools for storage. Reusable slates let students write, erase and practice again, while a cloth supplied the means to wipe the surface. Family Handyman says a string through the ruler’s hole could keep that cloth attached to the student’s supplies. The University of Wisconsin–Madison’s Object History entry on slate is among the sources listed in the report, but the supplied material does not give additional details about the historical practice.
As schools moved away from slate boards, the report says the holes remained, with hanging becoming their main use on many rulers. Manufacturers still make different designs: some smaller plastic rulers have no hole, while longer metal models may have one at each end. The report cites product information from STAEDTLER, Kapro and Westcott, along with examples of specialty craft rulers, to illustrate that design depends on the tool’s intended use.
“The hole at the end of a ruler is mainly there for storage.”
— Family Handyman report
Which Holes Serve Which Tasks
The purpose of any particular opening depends on the ruler’s design. The report describes binder holes, circle-drawing openings and craft features, but it does not claim that every ruler hole has those functions. A standard hanging hole should not automatically be treated as a precision drawing guide.
The historical account also has limits in the supplied material. It says students tied cloths to rulers for cleaning slate boards, but gives no specific dates, locations or evidence about how common the practice was. The report does not identify one origin for ruler holes or establish when hanging became their primary use.
Check the Ruler’s Intended Use
No further development or product announcement is described in the source material. For readers identifying a ruler at home, the next step is to look at its shape and any manufacturer instructions: a single opening near the end is generally useful for hanging, while multiple, evenly spaced or specially shaped openings may indicate a binder, drawing or craft function.
When exact circles or measurements are needed, use a tool designed for that job, such as a compass, and check the ruler’s markings and instructions. The hole itself does not change the ruler’s measuring accuracy.
Key Questions
What is the hole near the end of a ruler for?
On many standard rulers, it is mainly a hanging point for a hook, nail or pegboard, making the ruler easier to store.
Were ruler holes used with slate boards?
Family Handyman reports that some students tied a damp cleaning cloth to their rulers through the hole so it was available to wipe reusable school slates. The supplied report does not specify when or how widely this happened.
Can a ruler hole help draw a circle?
Some specialty rulers have openings designed to work as a pivot or pencil guide. That function is not universal; the report says a compass is a better choice when exact measurements are needed.
Do holes make a ruler more accurate?
No. The report says a ruler without holes can measure just as accurately as one with them. The holes support storage or particular tasks, rather than improving measurement accuracy.
Source: familyhandyman.com
