A572 / HSLAS Grade 50

Values marked † are derived from our V-die geometry (die contact width) rather than measured on the brake: hole/cutout distance = the die contact region from the bend line; Z-bend spacing = minimum flange + material thickness + inside radius (45° offsets add the die lean-over). The ACB Laser minimum leg applies when optical angle measurement is required on your bend. Shorter flanges bend fine, measured with standard methods. All bend data is air-bend reference in inches. We verify on a test bend before production runs.

Corner relief is part-specific. Open Corner relief for recommendations and PDF example photos for the selected gauge. Seam gap, relief-opening size and distance from a bend line are separate dimensions; confirm the flat pattern and forming sequence.

Hardware hole sizes and part numbers are our own catalog figures. Hole sizes differ between PEM series, so don't cross them with another shop's chart. The mounting hole tolerance the clinch depends on is ±0.002″. Countersink fits require at least 0.010″ of material land under the cone; anything less leaves a knife edge that burrs and never seats square. Tap drills shown are the standard shop pick (75% thread inch, D−pitch metric); dial the percentage to your material on the tap & clearance drill chart.