THE NASTY BASTARD
NUT & BOLT GENERATOR
Make a fastener →Spec it →
// Nut & Bolt Generator

Finally, nuts you can make bigger.
Bolts you can make longer & thicker.

Nut and bolt designs generated faster than your new brother.

NUT & BOLT GENERATORLIVE
The Nasty Bastard nut & bolt generator — a 3D M8 bolt and matching nut beside a bench spec plate of drill, clearance and torque numbers
Tap drill◇Clearance hole◇Thread pitch◇Seating torque◇Tap drill◇Clearance hole◇Thread pitch◇Seating torque◇
// spec it out
// thread size
// pitch
// length · mm
M8 × 1.25 × 40
Class 8.8
Thread pitch1.25 mm
Tap drill Ø6.75 mm
Clearance hole Ø9.0 mm
Threads engaged32 ×
Seating torque25 Nm
Make refinements →

Why it holds

01
Full control

Set the major diameter, pitch, thread angle, length, head and nut by hand — every dimension is yours to dial in.

02
Bench-ready numbers

Tap drill, clearance, torque and a spec plate that comes out 3D-print, CNC, or lathe ready.

03
Standard presets for fast moves

M3–M20 and UNC/UNF off the shelf when you just need it to fit — no fields to guess at.

For the bench
Hobby
$0
  • +Metric coarse & fine
  • +Tap drill & clearance
  • +3 saved fasteners
Start free
For the production run
Pro
$5/mo
or $50/yr · save two months
  • +Every standard & class
  • +Torque + drill charts (PDF)
  • +Counterbore & countersink
  • +Unlimited saved specs
Torque it up →
PRO+Voice measurement captureAdd-on · works with any plan

Say the number, it files itself. Sold on its own, so you only pay for it if you want it — no plan required.

On its own
$20/mo
With Pro
$15/mo
Shop seats
$10/user/mo
Shop seats, on the Shop plan
$7/user/mo
  • +Both hands stay on the job
  • +Works on web and the mobile app
  • +Learns your corrections over time

Nut up,
bolt down.

Make a fastener →
// FAQ

Frequently asked questions

What does the Nut & Bolt Generator do?
It's a thread generator that builds matched nut-and-bolt pairs from a diameter, pitch, and clearance — the helix math done for you — ready to 3D print or machine.
Can I 3D print the nuts and bolts it makes?
Yes. The clearance is built in so the threads actually spin together instead of fusing solid, and it favors printer-friendly coarse pitches. Print the bolt standing up and the nut flat.
Can I match an existing fastener?
Yes. Measure the major diameter and pitch of the part you are matching, enter them, and generate a mating nut or bolt.
Does it support metric and imperial threads?
Both, coarse and fine, with the tap-drill and clearance-hole sizes worked out for you.
Do I need to understand thread geometry?
No. You pick the numbers and the generator builds the helical profile and its matching mate.