Lead screw actuator 8-2 series

electriclinearhybrid stepper

Overview
Size 8 (20 mm) stepper lead screw linear actuator provides compact, precision linear positioning for industrial applications. The unit requires less than 1 in² mounting footprint and delivers up to 45 N of continuous thrust. Four form factors are available: External, Non-captive, Captive (electrical cylinder) and Kaptive.

Motor characteristics
Motor | Voltage [V] | Current [A] (RMS) | Resistance [Ω] | Inductance [mH] | Weight [g] | Lead wire | Motor length [mm]
8-2105 | 2.5 | 0.5 | 5.1 | 1.5 | 51 | 4 | 27.2
8-2205 | 4.4 | 0.5 | 8.8 | 2.7 | 74 | 4 | 38.1

Note
Motor insulation class: B. Motor temperature rise: 80 °C. Operating ambient temperature: -20 °C to 55 °C.

Available lead screw options & travel per step
Screw dia. [inch] | Screw dia. [mm] | Lead [inch] | Lead [mm] | Lead code | Travel per 1.8° step [mm]
0.138 | 3.5 | 0.024 | 0.6096 | AA | 0.003
0.138 | 3.5 | 0.048 | 1.2192 | B | 0.0061
0.138 | 3.5 | 0.096 | 2.4384 | J | 0.0122
0.138 | 3.5 | 0.0118 | 0.3 | AF | 0.0015
0.128 | 3.24 | 0.0394 | 1 | AB | 0.005
0.138 | 3.5 | 0.0787 | 2 | G | 0.01
0.138 | 3.5 | 0.1575 | 4 | M | 0.02
0.138 | 3.5 | 0.315 | 8 | T | 0.04
0.118 | 3.0 | 0.0197 | 0.5 | AD | 0.0025

• * Motor wiring and screw lead can be customized to customer requirements
• * Values may be truncated for brevity

Dimensional drawings / form factors
Available form factors: External, Non-captive, Captive (electrical cylinder), Kaptive. Dimension illustrations and mounting details are provided per form factor; stroke varies by configuration and motor stack (single or double).

Stroke specification (External / Non-captive / Captive — Single / Double stack)
Size A (mm) | Stroke B (mm) | Size L single stack (mm) | Size L double stack (mm)
22.2 | 12.7 | 27.2 | 38.1
28.55 | 19.05 | 27.2 | 38.1
34.9 | 25.4 | 27.2 | 38.1
41.3 | 31.8 | 27.2 | 38.1
47.6 | 38.1 | 27.2 | 38.1
60.3 | 50.8 | 27.2 | 38.1
73 | 63.5 | 27.2 | 38.1

Stroke specification (Kaptive)
Size A (mm) | Stroke B (mm) | Size C L=27.2 (mm) | Size C L=38.1 (mm)
10.9 | 9 | 0 | 0
14.6 | 12.7 | 3.5 | 0
20.8 | 19.05 | 9.5 | 0
27.3 | 25.4 | 15.5 | 4.5
33.7 | 31.8 | 22.5 | 11.5
40 | 38.1 | 28.5 | 17.5

Speed / thrust curves
Speed-thrust curves are provided for single-stack and double-stack configurations under test conditions. TEST CONDITION: 24 Vdc; Driver model: DS-OLS2-FPD bipolar chopper at rated current (RMS). Motor thrust will vary with voltage and driver; a 50% thrust margin is recommended for differing drive conditions.

Options

• Screw end machining — optional machining of screw ends to customer drawing or application needs.
• Teflon coating — greaseless Teflon-coated lead screws available to extend life and improve thrust versus conventional SUS screws; compatible with anti-backlash nuts.
• External anti-backlash nut — available; nut length depends on selected lead code.
• Non-captive anti-backlash nut — available for non-captive configurations.
• Encoder option (EK1) — resolutions (CPR): 100, 108, 120, 125, 128, 200, 250, 256, 300, 360, 400, 500, 512, 720, 800, 1000; output types: single-ended and differential (various codes).
• Power-off brake (Size 8 motor) — rated voltage: DC 24 V ±5%; resistance: 55 Ω ±10%; power: 9.6 W; hold torque >0.06 N·m; insulation class B; insulation resistance >100 MΩ (DC 500 V); dielectric strength AC 1000 V for 1 s; retraction and release times 50 ms; emergency brake cycle 200 cycles; life: 500,000 cycles; noise <60 dB.

Applications / use notes
Designed for compact precision linear positioning where a small mounting footprint is required. Multiple lead codes provide a wide range of travel per step for fine or coarse translation. Motor wiring and screw lead are configurable to match integration and control requirements.

Technical specifications

• Product family: Size 8 Stepper Lead Screw Linear Actuators (20 mm)
• Form factors: External, Non-captive, Captive (electrical cylinder), Kaptive
• Mounting footprint: less than 1 in²
• Continuous thrust: up to 45 N
• Motor insulation class: B
• Operating ambient temperature: -20 °C to 55 °C
• Motor models: 8-2105 (2.5 V, 0.5 A RMS, 5.1 Ω, 1.5 mH, 51 g, length 27.2 mm), 8-2205 (4.4 V, 0.5 A RMS, 8.8 Ω, 2.7 mH, 74 g, length 38.1 mm)
• Lead screw options: AA, B, J, AF, AB, G, M, T, AD with travel per 1.8° step from 0.0015 mm to 0.04 mm
• Stroke options: size and stroke tables provided for single and double stack motors
• Encoder resolutions available: multiple CPR values (see options)
• Brake option: power-off brake available with specified electrical and mechanical parameters
• Recommended test condition: 24 Vdc with bipolar chopper driver; allow 50% thrust margin for differing drivers/voltages