This Aluminum spacer is 0.438 inches long and has an inside diameter of 0.313 inches.
0.438 In. ID 0.563 In. OD 1.25 In. Long Bronze Bushing - AndyMark, Inc
Wheel Spacer - JEGS High Performance
HSK63A Dual Contact 1/4Shrink Fit Holder (Spray Nozzle Type) 6.30Gage Length
Fastenerdata - THREAD CHART 10b - Fastener Specifications
AndyMark Studica Canada - Robotics, Automation Technology for Education and Industry
Straight Spacers - Configurable Length, Inch, MISUMI
Aluminum Spacers, 3/8 Outer Diameter, 1/4 Hole, 1 Long, AS38-14-64
0.438 in. ID 0.500 in. OD 1.172 in. Long Brass Spacer - AndyMark, Inc
Fiber, Wire, Cable Catalog Datasheet
Len & Jerry's Modular - Ces-mh.com