Sheet Metal Jog Bend: How Small Can the Offset Be?

A sheet metal jog bend, two opposing bends that make a small step, is easy to draw and often hard to form.

How Small Can a Jog (Offset) Bend Be Before a Press Brake Can't Form It?

Usually not as small as the model shows. One press brake tooling article suggests an offset web of at least 10 times material thickness. Narrower jogs need special offset tooling, a shallower bend angle, or a redesign.

An r/metalworking poster had drawn a 1/4 in 316 stainless plate bracket with a jog of about 0.1 in, hoping to order it online, and suspected the bend was too small. Replies agreed: 0.1 in "is not going to happen." One suggested planning for an inside radius of at least material thickness, better 2×, depending on the vendor's tooling. Another estimated that a normal press brake setup for that plate would need at least a 50 mm V-die, leaving around 35 mm between the two bends. Those are forum estimates for one case, not rules.

Why the press brake sets the limit

With conventional tooling, a jog takes two ram strokes, and the part is flipped between them. In a press brake tooling article, Bystronic's Paul LeTang gives the rules:

• The center leg (web) must be larger than half the V-die body width (the whole die body, not just the opening).
• The side leg must be shorter than the V-die height plus the riser height.
• A narrower web needs a special tool that forms both bends in one stroke, at about three times the standard air bending force.

Designing a sheet metal jog bend

• Start from the rule of thumb. LeTang suggests an offset web of at least 10× material thickness, while noting that exceptions exist with special tooling.
• Reduce the angle. A reply suggested a shallow bend of around 15° to gain length between bends.
• Ask about offset dies. One tooling reference says spring-up offset tooling should keep the offset depth between 3 and 10 times material thickness.
• Remember thickness scales everything. Thick plate needs wider dies, so the minimum jog grows with it.

Related: the shortest flange you can bend, why inside bend radius differs from the drawing and bending narrow U-channels without press brake hits.

At DigiForge

Our sheet metal service covers laser cutting, press-brake forming and PEM insertion in Cold Rolled Steel, Galvanized Steel, Aluminum 5052, Aluminum 6061, Stainless 304 and Stainless 316, with a listed bend tolerance of ±0.5°. The quote analysis simulates the bend sequence and flags collisions, so a jog that can't be formed gets caught before you order. If your design needs offset tooling, ask us when you quote.