SG-8021 Mechanical Interface v1.0¶

Status: Public engineering evaluation reference
Release date: 2026-10-06

This page provides the SG-8021 mechanical information that is already published and suitable for early packaging and load evaluation.

Warning

This is not a manufacturing drawing. Detailed mounting-hole geometry, tolerances, datums, output-interface dimensions and connector clearances are not published here and must be confirmed from the controlled drawing for the ordered configuration.

Published Mechanical Envelope¶

Item	Published value
Maximum body diameter	100 mm
Overall product thickness	42.6 mm
Product weight	671 g
Allowable radial force	1300 N
Allowable axial force	550 N

Low-Profile Packaging Reference¶

The 42.6 mm published body thickness makes SG-8021 relevant to projects where axial packaging is a primary design constraint.

Actual installation clearance must still include:

Connector and cable routing
Customer-side mounting structure
Required service / assembly space
Driver configuration when included

Load Evaluation Boundary¶

Published radial and axial force values are useful for preliminary screening. Final suitability still depends on:

Load direction
Load offset / moment arm
Speed
Duty cycle
Shock or impact load
Required bearing life
Installation stiffness

Exploded Structure Reference¶

The SG-8021 product page contains a real exploded photograph of the actuator showing the motor, planetary transmission and a driver-board configuration.

View SG-8021 Exploded Product Reference

Use the image to understand product architecture only. Do not derive controlled dimensions, tolerances or production geometry from the photograph.

Controlled Drawing Reconciliation¶

Two SG-8021 mechanical drawings have now been reviewed.

The driver-equipped drawing shows an overall axial dimension of 42.06 mm.
A separate drawing identified as SG8021A shows a different mechanical envelope, including an overall axial dimension of 30.51 +/-0.50 mm.

The current public product page continues to use 42.6 mm as the nominal driver-equipped product thickness until the drawing revision and public nominal value are formally reconciled.

These drawings must not be interchanged during final design-in. Use the configuration-matched controlled drawing supplied with the quotation.

A full driver-equipped SG-8021 STEP assembly is available internally for engineering review but is not released here as a public download because it contains full assembly geometry.

Design-In Boundary¶

Before final mechanical design, confirm:

Mounting-hole pattern and thread details
Output-side interface geometry
Reference datums and tolerances
Cable and connector orientation
Load direction and moment arm
Shock / impact condition
Duty cycle
Driver-equipped or non-driver configuration

CAD and Controlled Drawing¶

A public simplified STEP model is not currently released in this repository for SG-8021.

For packaging, tolerance stack-up or production design-in, request the current controlled drawing and configuration-matched CAD file.

Request Controlled Drawing / CAD

SG-8021 Technical Datasheet v1.0 SG-8021 Product Page

Engineering Contact¶

Wanrong Wang
International Sales / Sales Engineer, SigGear
wangwanrong@siggear.com