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OUTPUT · STEP (AP214)
PARAMETRIC · 3D · STEP

Hex Head Screw (UNC / Inch) Generator

Select a UNC designation (e.g., 1/4-20) and length to generate a STEP file for a hexagon head bolt with Unified National Coarse (UNC) inch threads.

Standard ASME B1.1 / ASME B18.2.1 hex cap screw Shape Hexagonal Head Supported Sizes 1/4-20 to 1-8 UNC (10 variants)
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HOW-TO How to Generate a Hex Head Screw (UNC / Inch Thread) STEP File +
  1. Select the UNC designation and length
  2. Calculated values update in real time as parameters change
  3. Click "Download STEP File" or "Preview STEP Model"
  4. If you selected "Download STEP File", the STEP file will be saved automatically
  5. If you selected "Preview STEP Model", check the 3D model, then click "Download STEP File" manually
SAMPLE
STATIC · DEFAULT-VALUE MODEL
● SAMPLE IMAGE
VIEW · ISO
1/4-20 UNC · L=1/2″
HEXAGON HEAD SCREW UNC
DEFAULT PARAMETERS
Hex Head Screw (UNC / Inch) Generator SAMPLE · 1/4-20 UNC · L 1/2 IN
This is a sample image. After generating, view the actual model in 3D preview. 3D Preview →
CALCULATED · SPEC
AUTO-COMPUTED
P
1.27mm
Pitch
s
11.11mm
Width across Flats
k
3.97mm
Head Height
L
16.67mm
Total Length (k + ℓ)
Tags
Screw Utility
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PARAMETERS
Enter Dimensions
3 REQUIRED

Uses ASME B1.1 UNC (Unified National Coarse) standard values

Select from standard imperial lengths (excludes the head)

Model Detail

Checked: With threads

CAUTION

Bolts and nuts generated by this tool use custom clearance settings.

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ABOUT · STEP

The STEP file (.step / .stp) is a standard 3D CAD format that retains dimensional and topology data. Compatible with major CAD software including Fusion 360, SolidWorks, and FreeCAD.

  • Full-scale solid (mm units)
  • Editable dimensions and post-processing in CAD
  • Convertible with a slicer for 3D printing

Generating 3D model...