New T&L (SinoTech), Ball Bearing, 42MM Square (1.65 inch sq.), Angle 1.8 Degree Step (200 Steps per Revolution), Stepper / Stepping Motors, Part Number 42BYG401 - 06A, or 548001017, or 548-001-017.  Each bid quantity is for One (1) Motor.  You may bid / buy any number, up to the total quantity available above.

These were purchased at an industrial auction recently, and they are brand new in the original factory boxes.  We are not experts in stepping motors and their applications, but we found some information (below) about this motor series on the SinoTech website.  Please verify.  Best we can determine, they are designed to be powered with 6V DC current.  The "42BYG" is the motor series designator, the "401" specifies the voltage and other attributes, and we believe the 06A designates the pulley.

These motors appear to be well made, and they are no doubt expensive when purchased retail.  The ends are made of thick aluminum, with screw holes at each corner for mounting.  The light green center portion of the motor is steel, and the pulley is solid brass.  The wire colors are black, yellow, green, red, white, and blue.

Stepper motors are fairly heavy, so default shipping will be in Priority flat-rate boxes; tightly packed in crumpled paper for protection.  If you purchase in multiples of twenty (20), we will be glad to ship them to you in the factory boxes and styrofoam trays.

Note:  The labels are not stuck very tightly to the motor bodies, so they will probably come loose during shipment.  We will enclose them in plastic bags so you can re-apply after receiving if desired.

According to the calipers

Overall length (including pulley):  2.410"

Housing length (excluding pulley & shaft):  1.920"

Width:  1.665"

Shaft diameter:  .195"

Clearance between pulley & housing:  .120"

Pulley outer diameter:  .910"

Pulley inner diameter:  .795"

Pulley teeth:  28

Pulley outside width:  .366"

Pulley inside width:  .282"

Threads:  M3 x .65 (somewhat hard to find, but will interchange with #4-40 Unified / inch threads for most applications).

Mounting hole spacing:  1.230" on centers x .220" deep

According to the label on the motor:

T&L International Mfg./Didt. Inc.
T&L Stepping Motor
P/N 548001017
Type 42BYG401-06A

According to the manufacturer:

Stepper Motor Series 42BYG

Step Angle:  1.8 deg
Ambient Temperature:  -25 to +40 deg C
Temperature Rise:  85K
Insulation Resistance:  500VDC 100Mohm Min
Insulation Class:  B

42BYG401

Volts:  6
Current (amps):  0.8A
Resis. (ohms):  7.5
Induct (mH):  2.2
Holding torque (g. cm):  2300
Detent torque (g. cm):  280
Rotor inertia (g. cm):  36
Wt (kg):  .29
Wire diag. B