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_resolution = 0.5
step_shape_degrees = 45
texture = exclude
non_thread_length = 0
slot_depth = 2
thickness = 2.25
head_diameter = 12
head_height = 5
wing_ratio = 1
facets = 6
slot_width = 1
nut_height = 6
nut_diameter = 12
thread_step = 2
nut_thread_step = 2
head_type = hex
nut_thread_outer_diameter = 9
countersink = 2
non_thread_diameter = 0
thread_length = 25
drive_diameter = 5
resolution = 0.5
outer_diameter = 9
nut_step_shape_degrees = 45
thread_outer_diameter = 8
inner_diameter = 5.3
nut_type = normal
drive_type = socket
type = washer