STAEDTLER 551 01 precision car compass telescopic rod drawing instrument for technical drafting with a maximum circular diameter of approximately 265mm, made from steel construction.
STAEDTLER 551 01 German-Made Car Compass for Technical Drafting

Engineers, architects, and students require reliable tools for precise geometric construction. The STAEDTLER 551 01 precision car compass meets this need with its robust steel build and telescopic rod mechanism, enabling the drawing of accurate circles with a radius adjustable up to a maximum diameter of approximately 265mm. Manufactured in Germany by the STAEDTLER brand, this instrument is designed for applications in technical drawing, cartography, and detailed design work where consistency and accuracy are paramount.
Features and Construction

The design of the STAEDTLER 551 01 car compass focuses on functional performance for drafting tasks. Its construction and adjustment features are built to provide a stable drawing experience.
Material and Build
The compass is constructed from steel, a material chosen for its strength and ability to maintain a rigid form. This rigidity is crucial for a drawing compass, as it minimises flex and wobble during use, helping to ensure that repeated arcs and circles are consistent. The material also contributes to the tool's longevity under regular use in a drafting environment.
Size and Practical Fit
With a maximum achievable circular diameter of about 265mm, this compass covers a wide range of drawing scales suitable for technical plans and maps. The instrument itself has a packing size of 180mm by 77mm, indicating a compact form for storage and portability. The telescopic rod is the key feature that facilitates this range, allowing the user to extend or retract the arm to set the exact radius needed for the task at hand.
Uses and Placement

This compass is engineered for specific professional and educational contexts where precision is non-negotiable. Its application spans from detailed technical schematics to larger-scale geometric drawings.
Event or Professional Use
In professional settings such as architectural firms, engineering consultancies, or cartography studios, the STAEDTLER 551 01 serves as a precise tool for creating foundational geometry on plans, cross-sections, and maps. Its ability to produce consistent large-radius circles makes it suitable for laying out curves, arcs, and circular components in technical drawings with a high degree of accuracy.
Everyday Home Use
For advanced hobbyists, model makers, or students in technical disciplines, this compass provides a reliable upgrade from basic drawing sets. It is suited for projects like detailed scale models, complex artistic compositions requiring precise circles, or coursework in design and technology where professional-grade tools enhance the quality and accuracy of the work produced.
Benefits and Buying Value

The value of this drafting instrument lies in its specific construction and the practical advantages it offers for focused drawing tasks, backed by its German origin and brand reputation.
Reuse and Low Maintenance
The steel construction suggests a product built for repeated use over time. With simple care, such as wiping clean after use and storing in its provided packaging (180mm x 77mm size), the compass should maintain its functionality. This durability offers long-term value for users who regularly engage in technical drawing.
Why Choose This Product
Choosing the STAEDTLER 551 01 means selecting a tool defined by its precision engineering and specific capability for large-radius drawing. The key differentiators are its steel build for stability, the telescopic adjustment for radius control, and the stated maximum diameter of 265mm. It is a purpose-built instrument for those whose work depends on accurate geometric construction, supported by the STAEDTLER brand's heritage in stationery and drafting supplies.
