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
nut_step_shape_degrees = 45
thread_length = 25
thread_outer_diameter = 8
countersink = 2
step_shape_degrees = 45
nut_resolution = 0.5
non_thread_length = 0
socket_diameter = 5
nut_thread_step = 2
type = bolt
thread_step = 2
outer_diameter = 14
head_type = hex
non_thread_diameter = 0
head_diameter = 12
head_height = 5
nut_diameter = 12
inner_diameter = 8
nut_thread_outer_diameter = 8
thickness = 2
nut_type = normal
nut_height = 6