![]() ![]() What is the right bend radius for sheet metal?īelow is Xometry’s minimum bend radius reference table which is based on theoretical sheet metal gauge thicknesses. For working pressure in accordance with ASME B31.1, multiply by 0.85. For example, if the thickness of the sheet is 2mm, the minimum bend radius should be 1t which is 2mm. Recently we bent 8 pieces of 304 seamless stainless steel tubing 1.5 OD x 0.083 wall (14 ga) to a 5.25in inside radius with 81 degrees of arc and with 6in tangents on each end. Suggested Allowable Working Pressure for Carbon Steel Tubing Table 1Fractional Carbon Steel Tubing Allowable working pressures are calculated from an S value of 15 700 psi (108.2 MPa) for ASTM A179 tubing at 20 to 100☏ (28 to 37☌), as listed in ASME B31.3. The bend’s outer edge would crack if it exceeds the minimum bend radius which is typically specified according to the metal sheet thickness (t) like 1t, 2t, 3t etc.Ī typical recommendation is 1t for all sheet metal parts, which means the smallest bend radius should be at least equal to the sheet thickness. Moreover, bending imparts much strength to the sheet metal compared to their flatter counterparts.įor example, an aluminium sheet bent into a V cross section will be much stiffer and stronger than the same flat sheet.īending a metal sheet usually comes with a set of calculations and design requirements. In sheet metal fabrication, curving sheets according to a specific bend radius is one of the most common operations used to create flanges, curls, seams etc. ![]()
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