Why is the unfolded flat width slightly shorter than L + 2H?

When sheet metal is bent 90 degrees on a press brake, the outside of the bend stretches. Subtracting the Bend Deduction (BD) ensures your finished U-bracket measures exactly L across the web and H along both legs after bending.

Are the 6 mounting holes exported as closed circles on the CUT layer?

Yes! All 4 side-leg bolt holes and 2 center-web mounting holes are exported as closed LWPOLYLINE loops on the CUT layer so your laser/plasma CAM software cuts the interior holes first before cutting the outer perimeter.

Can I use this U-channel bracket for 5052 aluminum as well as steel?

Yes. 5052-H32 aluminum and mild steel have nearly identical air-bending K-factors (0.40 to 0.42). Never use 6061-T6 aluminum for tight 90-degree bends, as T6 temper cracks along the bend line—always specify 5052-H32 for bent sheet metal brackets.

How are the press-brake bend lines separated from cut lines?

The two vertical 90-degree bend lines are placed on the 'CREASE' layer (Blue) so your CNC laser or plasma cutter ignores them or etches them lightly as operator alignment marks.

TEMPLATE ID: PRE-SHT-002 120 × 80 × 50 mm (T=2mm) Pre-Verified 1:1 Static Files Ready

14-Gauge (2.0mm) Steel U-Channel Structural Mounting Bracket Flat Pattern (120 x 80 x 50 mm)

Interactive Parametric 2D & 3D Studio

Live 2D Dieline, Interactive 3D Fold Preview & Custom Size Generator

Pre-loaded with 14ga U-Channel Bracket (120×80×50) (120×80×50 mm, T=2mm)

1:1 CAD ENGINE READY

14-Gauge (2.0mm) Steel U-Channel Structural Mounting Bracket Flat Pattern (120 x 80 x 50 mm)

1CAD Style & Material SetupSheet

Select CAD Style / Model (36)Search & Filter

Material Stock Preset (Auto-Sets Caliper T & Kerf K)

Display Units

Reference Mode

2Dimensions (ID Mode)Millimeters (mm)

Center Channel Web Width (L)120 mm

Bracket Extrusion Depth (W)80 mm

Side Flange Leg Height (H)50 mm

Inside ID: 120×80×50mmOutside OD: 124×84×54mm

Thickness (T mm)

Laser Kerf (K mm)

3Brand Logo & 1:1 ExportZero Login

2D & 3D Brand Logo Mockup:

📤 Upload Logo

Print Artwork Bleed Guide:

Embed Spec Sheet & 50mm / 1" Scale Bars (Added on separate DIMENSIONS layer)

Pre-Flight Geometry Audit8/8 PASSED

PASS
Closed Outer Contours: 7 closed LWPOLYLINE cut loop(s) verified
PASS
Zero Duplicate Cut Paths: 128 unique segments (0 laser double-burns)
PASS
Flute & Kerf Tolerance Guard: T=2.00mm, K=0.000mm within structural limits
PASS
ISO Layer Color Separation: CUT (Red), CREASE (Blue), SCORE (Emerald), DIMENSIONS isolated
PASS
1:1 Physical Unit Header: Explicit mm/in SVG viewBox + DXF $INSUNITS=4 + 50mm PDF bar
PASS
Exact 2D Cut Bounding Parity: Cut Bounds 216.46×80mm === Blank Size
PASS
2D ↔ 3D Kinematic Model Sync: Archetype 'sheet_metal_u_bracket' synced (3 3D component(s))
PASS
True Vector Sheet Nesting Sync: 1:1 vector paths mapped to multi-up sheet grid

100%

CUT (0.76m) CREASE/SCORE (0.16m)● 7 Loops · Est. Cut: ~34s

1:1 Synced · Blank: 216.46 × 80 mm

2D 1:1 Unfolded Vector BlueprintBlank: 216.46 × 80 mm (8.52" × 3.15")

3D Interactive Fold & Orbit (Kraft Board)

80%

0%100%

Camera:

Yaw: -28°Pitch: 24°

⟳ Drag Anywhere to Rotate 3DL=120 × W=80 × H=50mm

U-CHANNEL WEB (120×80mm)

LEG (50)

Developed Flat Pattern

216.5 × 80.0 mm

90° Bend Allowance

4.46 mm

Mounting Holes (6×)

Ø10.0 mm

K-Factor Standard

K = 0.42 (DIN 6935)

Direct Pre-Generated 1:1 CAD Files

Download Static Ready-to-Cut Files (120×80×50 mm)

These static files are pre-calculated for 2mm material thickness. Click any format below to download the pre-built static file, or export custom dimensions directly from the interactive Studio above.

↓ Download .DXF AutoCAD / LightBurn ($INSUNITS=4) ↓ Download .SVG Illustrator / Corel (1:1 mm) ↓ Download .PDF 1:1 Print + 50mm Scale Bar

Product Manufacturing Specification Sheet

Calibrated Physical Clearances & Material Stock for 14ga U-Channel Bracket (120×80×50)

Parent Parametric Engine: Sheet Metal U-Channel Bracket →

Target Physical Product Size

120 mm Web Width × 80 mm Depth × 50 mm Side Flange Legs (Formed 90° U-Bracket)

Engineered Internal Cavity & Clearance

DIN 6935 K=0.42 Bend Deduction Applied + 6 Precision Mounting Bolt Holes

Recommended Board / Sheet Stock

14-Gauge (2.0mm) Cold Rolled Mild Steel or 2.0mm 5052-H32 Aluminum

Grain / Flute Orientation Rule

Orient press-brake bend lines perpendicular to sheet rolling grain

Production Engineering Note: Ready for direct Fiber Laser, Plasma, or Waterjet cutting and 16mm V-die press brake forming.

Structural Geometry & Material Reference (DIN 6935 Sheet Metal U-Bend & K-Factor Standard)

Fabricating a structural sheet metal U-channel, servo bracket, or clevis mount requires subtracting two 90-degree Bend Deductions (BD) from the total flat blank width so the bent side legs finish at exact parallel spacing (L). Our parametric U-bracket unfolder applies DIN 6935 neutral-axis K-Factor math (K = 0.42), chamfers all four outer mounting corners for deburred safety, places 6 precision closed bolt holes across the web and side legs, and isolates the two press-brake bend lines on the BLUE CREASE layer.

Total Developed Flat Pattern Width (W_flat)

W_flat = L_web + 2 * H_leg - 2 * BD_90

Subtracts two 90-degree press-brake bend deductions from the sum of the center web (L) and both side flange legs (2 × H).

90-Degree Bend Allowance (BA_90)

BA_90 = (pi / 2) * (R_inside + 0.42 * T)

Arc length along the sheet metal neutral axis (K = 0.42) for each 90-degree press-brake bend.

Internal CAD Silo & Related Ready-to-Cut Templates