Customized version of http://www.thingiverse.com/thing:193647

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=193647

Using the following options:

resolution = 0.5
thread_length = 25
nut_height = 6.3
thread_step = 2
nut_resolution = 0.5
thread_outer_diameter = 8
inner_diameter = 8
outer_diameter = 14
non_thread_diameter = 0
nut_step_shape_degrees = 45
type = nut
nut_type = normal
non_thread_length = 0
step_shape_degrees = 45
head_diameter = 12
nut_thread_step = 1.6
nut_diameter = 12
head_height = 5
thickness = 2
socket_diameter = 5
nut_thread_outer_diameter = 8.5
countersink = 2
head_type = hex