cadSet/CADAM/benchmarks/03-hex-bolt-and-nut.md

3 — Hex bolt & nut — real threads

Prompt

Create an M12 hex bolt 45 mm long with a real threaded shaft and a standard hex head, plus its matching hex nut, placed side by side.

Fully parametric OpenSCAD built from the prompt above — adjustable dimensions and colours, exported as .SCAD and rendered to the orbiting preview with render.sh.

Parametric controls: 3 dimensions · 2 colours

What it demonstrates

• Real ISO metric threads via BOSL2 screw() / nut() (spec "M12x1.75") — not faked with stacked cylinders
• A complete fastener set: hex bolt + matching hex nut
• Standard spec string drives pitch, head, and thread profile

Editable parameters

Parameter	Default	Range / options	Description
screw_length	45	[10:1:100]	Length of the screw shaft

OpenSCAD source — 03-hex-bolt-and-nut.scad

include <BOSL2/std.scad>
include <BOSL2/screws.scad>

/* [Screw Parameters] */
// The screw size and pitch specification
screw_spec = "M12x1.75"; 

// Length of the screw shaft
screw_length = 45;      // [10:1:100]

/* [Colors] */
bolt_color = "LightSlateGray";
nut_color = "LightSlateGray";

$fn = 64;

// Place bolt on the left
translate([-15, 0, 0])
color(bolt_color)
screw(spec=screw_spec, l=screw_length, head="hex");

// Place nut on the right
translate([15, 0, 0])
color(nut_color)
nut(spec=screw_spec);