Staedtler Ruler Scale Triangular No 1 Din 1:20, 25, 50, 75, 100, 125 - 561 98-1BK

Staedtler Ruler Scale Triangular No 1 Din 1:20, 25, 50, 75, 100, 125 - 561 98-1BK

The Staedtler 561 98-1BK is a triangular scale ruler carrying six DIN-standard scales — 1:20, 1:25, 1:50, 1:75, 1:100 and 1:125. It is the No 1 set in the Staedtler triangular ruler range, differentiated from the No 2 (SKU 561 98-2BK) by the inclusion of the 1:125 scale in place of the 1:33-1/3 scale found on that ruler. For most detail drawing applications the two rulers share four common scales (1:20, 1:25, 1:50 and 1:75), but the specific inclusion of 1:125 makes this ruler the appropriate choice where that scale is a working requirement — survey and civil engineering drawing, infrastructure and road design documentation, and certain engineering drawing standards that specify it.

THE 1:125 SCALE — WHEN IT MATTERS

The 1:125 scale sits between 1:100 and 1:200 and is not found on most architectural scale rulers. It appears in survey drawing, civil and infrastructure engineering documentation, and some legacy drawing standards where a scale between 1:100 and 1:200 was specified. For practitioners working in those disciplines, the absence of a 1:125 scale on a ruler means conversion or estimation — neither of which is appropriate for precise technical documentation. This ruler provides it directly, making it the right choice for civil drafters, surveyors, infrastructure designers and anyone working from drawing standards that include 1:125 as a required scale.

SCALES FOR DETAIL DRAWING WORK

The remaining five scales on this ruler — 1:20, 1:25, 1:50, 1:75 and 1:100 — cover the detail and component drawing range shared with the No 2 ruler. These are the scales used for sections, elevations, construction details, assembly drawings and shop drawings: drawings where the size of the representation needs to convey enough information for a builder, fabricator or contractor to work from directly. At 1:20 a window detail shows reveals, glazing rebates and sealing; at 1:50 a wall section shows structure, insulation and lining clearly; at 1:100 a room is shown in enough detail for interior documentation.

CHOOSING BETWEEN THE STAEDTLER TRIANGULAR SCALE RULERS

EzyShop carries three Staedtler triangular scale rulers for different scale requirements. The No 1 (this ruler, SKU 561 98-1BK) includes the 1:125 scale, suited to survey, civil and infrastructure drawing alongside standard detail work. The No 2 (SKU 561 98-2BK) replaces 1:125 with 1:33-1/3, suited to disciplines that require that less common ratio. For site plans, overview drawings and the larger planning scales, the separate Staedtler triangular ruler (SKU 61 98-4BK) covers 1:100 to 1:500. Together the three rulers cover the complete scale range from detailed components to broad site context.

KEY FEATURES

• Six DIN scales: 1:20, 1:25, 1:50, 1:75, 1:100 and 1:125
• Includes 1:125 scale — suited to survey, civil engineering and infrastructure drawing
• Triangular cross-section — two scales per face, all six accessible by rotation
• DIN-compliant — consistent with Australian Standards metric drawing practice
• Black markings for high-contrast reading under drawing board and desk lighting
• Part of the Staedtler triangular scale ruler range — see also SKU 561 98-2BK and SKU 61 98-4BK
• Suited to surveyors, civil engineers, architects, draughtspeople and technical drawing students
• SKU 561 98-1BK

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