T8 lead screw and brass nut (Tr8×8, 2 mm pitch 4-start) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/lead-screw-t8/  (CC BY 4.0)
Basis: Tr8×8(P2) trapezoidal lead screw as sold for 3D printers; nut dimensions from common catalogues
Catalog version: 2026-10-20

Sizes: see table below
- Ø8 mm screw, 2 mm pitch, 4 starts → 8 mm lead (one turn = 8 mm). Tr8×2 single-start (2 mm lead) exists and looks identical; check the spec.
- Brass nut: Ø10.2 body, 15 mm long, Ø22 flange 3.5 mm thick, four Ø3.5 holes on a 16 mm circle (M3). Print the pocket for the flange at Ø22.3.
- Couple to a NEMA 17 with a 5 → 8 mm coupler, or buy the screw with an integrated motor.

part  dia_mm  length_mm  detail
screw  8  100–400  Tr8×8(P2), 4-start
nut body  10.2  15  brass, Tr8×8
nut flange  22  3.5  4 × Ø3.5 on 16 PCD

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, 7 parts): https://xemstudio.com/files/hardware/lead-screw-t8/index.json
API: https://xemstudio.com/api/geometry?object=lead-screw-t8