Target Range for R-Bending (Large Radius)

Applicable sheet thickness and Radius size for R-bend shapes

  • R-bend shapes are generally manufactured using a feed bending process. This creates continuous tool marks that remain on the bent part. For details, please see “Bending Specifications“.
  • If feed bending is difficult, we will propose radius sizes for which normal bending or special R-bend tools can be used. If this is acceptable, we will automatically change the R size on the meviy part.
  • For details, please refer to the R-size conversion table below.

Metric Thickness - Inner R range

Plate thicknessMinimum inner RMaximum inner R
0.810150
1.010150
1.210150
1.510150
1.610150
2.010 *150
2.315150
2.510150
3.030150
3.230150

* Steel material is R15 as minimum inner R.

Inner R range
*R-size conversion table for when Feed bending is not possible.
Inner R size before conversionInner R size after conversionBending process used
Within twice the sheet thicknessThickness (reference value)Normal Bending
Less than R3Thickness (reference value)
R3 ≤ R ＜ R6R3R-bending with special tools
R6 ≤ R ＜ R10R6
R10 ≤ R ＜ R12.5R10
R12.5 ≤ R ＜ R15R12.5
R15 ≤ R ＜ R17.5R15
R17.5 ≤ R ＜ R20R17.5
R20 ≤ R ＜ R22.5R20
R22.5 ≤ R ＜ R25R22.5
R25 ≤ R ＜ R30R25
R30 ≤ R
  • Not available
  • *Please request a manual quote.
ー

Inch Thickness - Inner R range

Plate thickness Minimum inner R Maximum inner R
#24 0.394″ 5.905″
#22 0.394″ 5.905″
#20 0.394″ 5.905″
#19 0.394″ 5.905″
#18 0.394″ 5.905″
#16 0.394″ 5.905″
#14 0.394″ 5.905″
#13 0.394″ 5.905″
#12 0.394″ 5.905″
#11 0.181″ 5.905″
Inner R range

Applicable materials and surface treatments for R-bend shapes

Materials and surface treatments available for R bending are as follows.

Metric Thickness Gauge Standard

Material: Ferrous MetalsSurface TreatmentR bending available
Feed BendingR-bending with special tools
Low Carbon Steel (Cold/Hot Rolled)–Automatic QuotationAutomatic Quotation
Powder Coating
Wet Paint
Electroless Nickel Plating
Black Oxide
Trivalent Chromate (Clear)
Trivalent Chromate (Black)Automatic QuotationManual Quotation
Cold Rolled Low Carbon Steel (Electrolytic Zinc Plating)Electrolytic Zinc PlatingAutomatic QuotationAutomatic Quotation
Cold Rolled Low Carbon Steel (Galvanized)Hot Zinc Plating
Material: Stainless Steel Finishing Method R bending available
Feed Bending R-bending with special tools
304 Stainless Steel 2B Automatic Quotation Automatic Quotation
  • Single-sided #400 polished
  • (appearance side)
protective film on one side		 Manual Quotation
  • Single-sided hairline (appearance side)
  • protective film on one side
 Manual Quotation Not supported
430 Stainless Steel 2B Automatic Quotation Automatic Quotation
Material: AluminumSurface TreatmentR bending available
Feed BendingR-bending with special tools
5052 Aluminum Alloy—Automatic QuotationAutomatic Quotation
Clear Anodize
Black Anodize
Black Anodize (matte)
Trivalent Chromate Passivation
5052 AL Alloy Pre-Finish, Clear AnodizeClear Anodize
5052 AL Alloy Pre-Finish, Black AnodizeBlack Anodize
Material: Perforated MetalHole Diameter × Hole PitchR bending available
Feed BendingR-bending with special tools
  • Perforated Metal – 60° Staggered Round Hole Type –
  • (304 Stainless Steel-BA, Bright Annealed)
ø1 × 2pAutomatic QuotationAutomatic Quotation
ø2 × 3p
ø3 × 5p
ø5 × 8p
ø8 × 12p

Inch Gauge Standard (FR bending only)

Material: Ferrous Metals Surface Treatment Sheet Thickness (Inch) *1 (mm) External Dimensions *2 *4
Length Width Height
Low Carbon Steel (Cold/Hot Rolled)
 – 0.0299″ (#22), 0.0359″ (#20), 0.0418″ (#19), 0.0478″ (#18), 0.0538″ (#17), 0.0598″ (#16), 0.0747″ (#14), 0.0897″ (#13), 0.1046″ (#12), 0.1196″ (#11) 0.759mm (#22), 0.912mm (#20), 1.062mm (#19), 1.214mm (#18), 1.367mm (#17), 1.519mm (#16), 1.897mm (#14), 2.278mm (#13), 2.657mm (#12), 3.038mm (#11) 5–1500mm (59.05″)
Paint *3
5–1500mm (59.05″) 5–1500mm (59.05″) 5–1500mm (59.05″)
Black Oxide 5–609.6mm (24″) 5–609.6mm (24″)
Trivalent Chromate (Clear) 5–1500mm (59.05″) 5–584mm (23″) 5–813mm (32″)
Trivalent Chromate (Black)
Low Carbon Steel (Cold Rolled) Electrolytic Galvanized *5 0.0336″ (#22), 0.0396″ (#20), 0.0516″ (#18), 0.0635″ (#16), 0.0785″ (#14) 0.701mm (#24), 1.006mm (#20), 1.311mm (#18), 1.613mm (#16), 1.994mm (#14) 5–1500mm (59.05″)
Hot Galvanized *5 0.0276″ (#24), 0.0336″ (#22), 0.0516″ (#18), 0.0635″ (#16), 0.0785″ (#14) 0.701mm (#24), 0.853mm (#22), 1.311mm (#18), 1.613mm (#16), 1.994mm (#14) 5–1500mm (59.05″)
Material: Stainless Steel Surface Finish Sheet Thickness (Inch) *1 (mm) External Dimensions *2 *4
Length Width Height
  • 304 Stainless Steel
 2B 0.0312″ (#22), 0.0375″ (#20), 0.0437″ (#19), 0.0500″ (#18), 0.0625″ (#16), 0.0781″ (#14), 0.0937″ (#13), 0.1094″ (#12), 0.1250″ (#11) 0.792mm (#22), 0.953mm (#20), 1.110mm (#19), 1.270mm (#18), 1.588mm (#16), 1.984mm (#14), 2.380mm (#13), 2.779mm (#12), 3.175mm (#11) 5–1500mm (59.05″)
Single Sided #4 Brushed *6 0.0312″ (#22), 0.0375″ (#20), 0.0437″ (#19), 0.0500″ (#18), 0.0625″ (#16), 0.0781″ (#14), 0.0937″ (#13) 0.792mm (#22), 0.953mm (#20), 1.110mm (#19), 1.270mm (#18), 1.588mm (#16), 1.984mm (#14), 2.380mm (#13)
Material: Aluminum Alloy Surface Treatment Sheet Thickness (Inch) *1 (mm) External Dimensions *2 *4
Length Width Height
5052 Aluminum Alloy — 0.025″, 0.032″, 0.040″, 0.050″, 0.063″, 0.080″, 0.090″, 0.100″, 0.125″ 0.635mm, 0.813mm, 1.016mm, 1.270mm, 1.600mm, 2.032mm, 2.286mm, 2.540mm, 3.175mm 5–1500mm (59.05″)
Anodize (Clear) 5–914.4mm (36″) 5–609.6mm (24″)
Anodize (Black)
  • *1 The plate thickness tolerance is ±10% (reference value).
  • *2 The maximum and minimum dimensional values are limited by the shape of the bend.
  • *3 Select a paint color from the table (Appendix Table).
  • *4 The maximum length and width dimensions (Appendix Table) may vary depending on the surface treatment.
  • *5 The machining surface will not be plated as it is a pre-treatment material.
  • *6 Protective sheets (one-side only) affixed.

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