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:
nut_height = 6
head_height = 12
socket_diameter = 5
head_diameter = 12
type = bolt
inner_diameter = 8
thread_step = 2
thread_outer_diameter = 10
nut_thread_step = 2
thread_length = 35
nut_thread_outer_diameter = 9
nut_diameter = 12
countersink = 2
nut_type = normal
nut_step_shape_degrees = 45
outer_diameter = 14
non_thread_length = 0
head_type = socket
step_shape_degrees = 45
non_thread_diameter = 0
resolution = 0.5
thickness = 2
nut_resolution = 0.5