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Screw-jack screw Tr16×4, 90 mm thread, Ø28 head with tommy-bar holes

Name: Screw-jack screw Tr16×4, 90 mm thread, Ø28 head with tommy-bar holes dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

What thread does a screw jack use? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance

Also called: jack screw, lifting screw, trapezoidal screw tr16, husillo de gato, Hubspindel

Exact dimensions. True size, with no printing tolerance added.

length: 28.0 mm
width: 28.0 mm
height: 106.0 mm

Notes

Tr16×4 trapezoidal (ISO 2904 basic profile, 30°) screw, 90 mm of thread, with a Ø28 × 16 head cross-drilled Ø6 both ways for a tommy bar.
Lift per turn = pitch = 4 mm; with friction coefficient 0.15 a 30° Tr thread at this lead angle (4.5°) is self-locking, so the load stays up.
Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

Screw-jack screw Tr16×4, 90 mm thread, Ø28 head with tommy-bar holes size chart

dimension	value
thread	Tr16×4, single start, right hand
thread length	90 mm
minor Ø (basic)	12 mm
head	Ø28 × 16, 2 × Ø6 cross holes

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Henry T. Brown (1868, public domain)	Five Hundred and Seven Mechanical Movements — scan on archive.org	web	Publisher's page; dimensions are facts
507movements.com	Brown's movement No. 389: figure, his text and an animation	web	Publisher's page; dimensions are facts
Xem Studio	drawing	web	Publisher's page; dimensions are facts

Free files

★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

screw-jack-screw-tr16x4

screw, axis Z, thread z 0..90, head z 90..106

STEP · STL

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

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Plain text: sheet.txt · JSON: /api/geometry?object=screw-jack-screw-tr16x4

Screw-jack screw Tr16×4, 90 mm thread, Ø28 head with tommy-bar holes, isometric render of a generated part — Render of screw-jack-screw-tr16x4 from the free STEP; not to scale.

Fits with

Free

Screw jack, Tr16×4 (4 mm lift per turn), isometric render of a generated part

Screw jack, Tr16×4 (4 mm lift per turn)4 sizes★ 1 file

Questions

What thread does a screw jack use?

Tr16×4 trapezoidal (ISO 2904 basic profile, 30°) screw, 90 mm of thread, with a Ø28 × 16 head cross-drilled Ø6 both ways for a tommy bar.