We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
White triangular plastic scale ruler 12 inches long with six engineering scales 10 20 30 40 50 60 parts per inch

Staedtler

Staedtler 9871934BK Triangular Scale 12" White 10 20 30 40 50 60 parts per inch

SKU CH-ME1R-STDA3 MPN 9871934BK

Triangular scale ruler with six engineering scales from 10 to 60 parts per inch

  • Product typeDrafting Supplies
  • Product colorWhite
  • Pack quantity1 each
  • Precision drafting with six engineer scales
  • Full divided 10 20 30 40 50 60 parts per inch
  • Triangular design gives three usable edges
  • White plastic body with regular grooves
  • Twelve inch length fits standard drawing sheets

Engineering Triangular Scale 12

The Staedtler 9871934BK is a 12-inch triangular scale designed for engineers and drafters who need precise ratio measurements. Its three-sided profile provides six distinct scales in a single tool, covering 10, 20, 30, 40, 50 and 60 parts per inch for detailed technical drawings.

White Plastic Body with Regular Grooves

Moulded from white plastic, the scale resists corrosion and stays legible under studio lighting. The regular grooves give a positive tactile reference when aligning the rule against a drawing board or parallel rule, while the flat triangular cross-section prevents rolling off an inclined desk surface.

Single-Unit Supply for Immediate Use

Supplied as one complete scale, it requires no assembly or calibration before the first job. The permanent moulded graduations eliminate the risk of adhesive labels peeling or fading, so the instrument remains accurate for the life of the product. Not suited for users who need metric graduations or scales beyond 60 parts per inch.

How it compares

Measured against everything we stock in Rulers & Technical Drawing Aids, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 60% of the 41 comparable items (median $10.99).

Specifications

Product
Brand nameStaedtler
Product typeDrafting Supplies
Product colorWhite
Size & build
Shipping weight0.05 kg
Package size97 × 19 × 13 mm
In the box
Pack quantity1 each

Questions about this item

What scales does the 12-inch triangular ruler offer?

The ruler provides six fully divided scales at 10, 20, 30, 40, 50 and 60 parts per inch across its three faces.

What are the physical dimensions and material of the Staedtler 9871934BK?

It is a 12-inch triangular scale made of white plastic with regular grooves on each face.

How do you read the correct scale on this triangular tool?

Rotate the ruler until the desired scale marking — 10, 20, 30, 40, 50 or 60 parts per inch — faces you, then measure along that edge.

More in Rulers & Technical Drawing Aids

Similar items