T8 lead screw Tr8×8 envelope, 100 to 400 mm — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/t8-lead-screw/  (CC BY 4.0)
Basis: Tr8×8(P2) trapezoidal lead screw, 4-start: Ø8 major, 2 mm pitch, 8 mm lead; envelope only
Catalog version: 2026-10-20

Sizes: see table below
- Ø8 envelope, 100, 150, 200, 250, 300 and 400 long; the thread is not drawn.
- Tr8×8(P2): 2 mm pitch, four starts, 8 mm of travel per turn. Tr8×2 (single start, 2 mm per turn) has the same envelope; four thread ends visible on the screw's end face mean 8 mm lead.
- The end goes into a 5 → 8 mm coupler on a NEMA 17 or a bearing of 8 mm bore.

file  Ø  length
t8-screw-100  8  100
t8-screw-150  8  150
t8-screw-200  8  200
t8-screw-250  8  250
t8-screw-300  8  300
t8-screw-400  8  400

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Leadscrew — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Leadscrew
- McMaster-Carr: Lead screws and nuts (free STEP/IGES/STL per part, for your own design use; no redistribution) — STEP, IGES, STL, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/lead-screws/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/t8-lead-screw/index.json
API: https://xemstudio.com/api/geometry?object=t8-lead-screw