These are Axle Shafts from Du-Bro

Features

Spring steel construction

Includes

Two axles with lock nuts

Specifications

Length: 47.3mm (1-7/8") overall end to end
31.8mm (1-1/4") axle length
12.6mm (1/2") thread length

Diameter: 4mm (5/32") axle dia.
7.9mm (11/32") thread dia.

NOTES: Nut uses a 1/2" wrench