Now produced in the USA

Thread whirling: custom tools for your toughest threads

For bone screws, worm shafts, and slender threaded parts

Inserts are ground, coated, and finished in Franklin, TN, so they’re Greenline eligible for faster delivery. Qualifying custom inserts ship within 5 business days of drawing approval.

Request a quote▶ Watch it in action

 

2,500+
configurations
70+
standard swivel heads
5 days
Greenline specials, after drawing approval
USA
ground and finished in Franklin, TN
Two HORN thread whirling heads fitted with indexable inserts

What is thread whirling?

A whirling head fitted with indexable inserts spins around the turning workpiece while the feed follows the thread pitch. The result is accurate, clean threads with low cutting forces, most often on Swiss-type machines.

  • ▶ Long, thin threaded parts
  • ▶ Tight pitch tolerances
  • ▶ High surface finish needs
  • ▶ Hard-to-machine materials
  • ▶ High-volume production

Profiles: metric, trapezoidal, special medical threads, worm profiles (ZA/ZI/ZK), multi-start threads

See it in action

How Are Bone Screws Machined? | Thread Whirling Explained
How to Start Thread Whirling (and the tools you need)

Check out our thread whirling playlist on YouTube →

Thread whirling systems at a glance

S302 / S271
Monoblock

A stable system with a wide range of standard heads.

S271
Modular

Change the head at the taper interface for less downtime and longer tool life.

S271
HORN Turbo

Roughing and finishing inserts share the cut for faster cycles and lower tooling cost.

S302 / S271
Jet whirling

Coolant runs through the head to the edge: less wear, chips cleared away.

S302
High-speed

Turning and whirling run in parallel for higher productivity.

Greenline: special inserts in 5 business days

See full Greenline criteria →
1
Order and approve your drawing
Place a special insert order as usual.
2
We check eligibility automatically
Tool family, geometry, coating, and quantity are compared to the criteria.
3
It ships within 5 business days after design approval
At no extra cost.

Grade guide

Steel
Stainless steel
Cast iron
Non-ferrous
Superalloys
P
M
K
N
S
RC2P
SG3P / IG3P
RC2P
DD25*
SG3P

*DD25 is not available through Greenline.

Webinar · December

Thread whirling webinar with Gardner

Learn the basics of thread whirling.

Register for free
HORN Academy

Hands-on product training

Solve real manufacturing challenges, see tools perform live, and learn through real machining.

See training dates

Have a thread you need to whirl?

Send us your drawing. Our applications engineers will recommend the right head, inserts, and grade.