Parallel ruler blade 200 × 20 × 5, pivot hole and 3 mm slot — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/parallel-ruler-blade-200/  (CC BY 4.0)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 200.0, width 20.0, height 5.0
- 200 × 20 × 5 straight-edge with a Ø3 pivot hole 40 mm left of centre and a 3 mm slot from 12 to 40 mm right of centre: two blades and two crossed 80 mm links make a parallel ruler that opens 0–55 mm.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
blade  200 × 20 × 5 mm
pivot hole  Ø3 at x = −40
slot  3 mm wide, centres x = 12 … 40

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 324: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_324.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/parallel-ruler-crossed-arms-mechanism/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/parallel-ruler-blade-200/index.json
API: https://xemstudio.com/api/geometry?object=parallel-ruler-blade-200