Parallel ruler bar 200 × 20 × 5 with Ø3 pivot holes 100 mm apart — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/parallel-ruler-bar-200-h100/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
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 two Ø3 holes 100 mm apart on its centre line: two of them and two equal links make the classic parallel ruler (a parallelogram linkage).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
bar  200 × 20 × 5 mm
holes  2 × Ø3 at x = ±50

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. 325: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_325.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/swinging-arm-parallel-ruler-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/parallel-ruler-bar-200-h100/index.json
API: https://xemstudio.com/api/geometry?object=parallel-ruler-bar-200-h100