What shank size is American style press brake tooling?

1/2 in (12.7 mm). American style punches use a 1/2 in shank that is held in a separate punch holder on the ram, unlike Amada and Wila tooling which inserts directly into the machine clamp.

Which press brake brands use American style tooling?

Accurpress, Cincinnati, Pacific and Wysong are the most common, along with older Chicago and Di-Acro machines. Many of these presses remain in service in job shops and maintenance departments.

Why does my bend angle vary along the part on an American press brake?

On American style tooling the punch is held in a separate holder, so a worn holder bore or loose clamp screws let the shank move under load. Check holder wear and screw torque first, then check bed condition and whether crowning is needed.

Can I convert an American press brake to precision tooling?

Sometimes. Conversion depends on the clamp, the ram and whether the bed accepts a different die base. Many shops keep American style tooling and improve results with better holders and crowning instead.

American Style Press Brake Tooling | 1/2 in Shank Punches & Dies

American style press brake tooling — what is it?

American style press brake tooling uses a 1/2 in (12.7 mm) shank punch held in a punch holder on the ram, with dies that commonly sit on a plain or tab-located base. It is standard on Accurpress, Cincinnati, Pacific and Wysong machines and remains widespread in maintenance and job-shop work.

American style reference dimensions
Item	Reference value	Note
Punch shank	1/2 in (12.7 mm)	Held in a separate punch holder
Retention	Punch holder and set screws	Confirm holder condition and screw torque
Die base	Plain or safety-tab located	Confirm which base your bed uses
Punch body	varies, often heavier section	Heavier body than precision-ground European tooling
Typical machines	Accurpress, Cincinnati, Pacific, Wysong	Also found on older Chicago and Di-Acro machines

American style covers a wide range of machine vintages and holder designs. Confirm the shank diameter, body height and die base against the machine before ordering.

Which profiles are available?

Profiles are supplied to the standard dimensions of the system, so they can be combined with existing tooling of the same system. Special profiles, radii and offsets are produced to drawing.

American style profiles commonly supplied
Profile	Angle range	Typical use
Straight punch, 1/2 in shank	28°–90°	General bending
Gooseneck punch, 1/2 in shank	30°–88°	Return flanges and box work
Acute punch	28°–60°	Springback compensation
Punch holder	—	Holds the shank; confirm bore and clamp screw condition
Single-V die	30° / 88°	Basic air bending
2V and multi-V dies	30°–90°	Multiple openings in one body
Die with safety tab	—	Positive location on a tabbed bed

Working with American style tooling

Because the punch is held in a separate holder rather than inserted directly into the clamp, two extra things drive accuracy: the condition of the holder bore and the torque on the clamp screws. A worn holder lets the shank move under load, which shows up as inconsistent bend angles along the part rather than as a single bad bend.

What to check before ordering

Shank diameter and length. 1/2 in is standard but confirm the length the holder needs.
Holder bore condition. Measure for wear before buying new punches.
Die base. Plain base and tab-located base are not interchangeable.
Bed condition. Worn beds change effective tool height along the machine.

American style press brake punch set with nine punches — American style punches with the 1/2 in shank, supplied as a matched set.

American style press brake tools: 1/2 in shank punches and heavy section dies.

Frequently asked questions

These are the questions buyers ask most often when specifying tooling for this system.

What shank size is American style press brake tooling?: 1/2 in (12.7 mm). American style punches use a 1/2 in shank that is held in a separate punch holder on the ram, unlike Amada and Wila tooling which inserts directly into the machine clamp.
Which press brake brands use American style tooling?: Accurpress, Cincinnati, Pacific and Wysong are the most common, along with older Chicago and Di-Acro machines. Many of these presses remain in service in job shops and maintenance departments.
Why does my bend angle vary along the part on an American press brake?: On American style tooling the punch is held in a separate holder, so a worn holder bore or loose clamp screws let the shank move under load. Check holder wear and screw torque first, then check bed condition and whether crowning is needed.
Can I convert an American press brake to precision tooling?: Sometimes. Conversion depends on the clamp, the ram and whether the bed accepts a different die base. Many shops keep American style tooling and improve results with better holders and crowning instead.

Confirm the system for your machine

Send the machine make and model, or a photo of the punch tang and the clamp, and we will confirm the tooling system and quote standard or special tooling.

Email [email protected]

The pages below cover the other tooling systems and the technical reference data used when specifying tooling.

Amada compatible tooling — 13 mm tang, 835 mm segmented sets. The most widely used system in North America.
Trumpf / Wila compatible tooling — 20 mm safety tang with locking pins, in 100 / 415 / 835 mm segments.
European style tooling — 13 mm tang and 60 / 80 mm die bodies for LVD, SafanDarley, Adira and Bystronic machines.
Press brake tooling guide — profiles, shank standards and selection rules
V-die opening selection chart — tonnage per metre and minimum flange

American style press brake tooling