3D CAD Library

Free STEP files for engineering fit checks and assembly modelling

Zelentech provides free downloadable 3D flange models in STEP format for use in engineering fit checks, piping layout, and assembly design. All models are generated parametrically from standard dimension tables using CadQuery and OpenCASCADE.

EN 1092-1 Flanges

European Standard

Types 01 (Plate Slip-On), 12 (Hubbed Slip-On), 11 (Weld Neck), and 05 (Blind). PN10 through PN250, DN25 to DN200.

Type 01Type 12Type 11Type 05
254 STEP files · STEP AP214Browse library →

JIS B2220 Flanges

Japanese Industrial Standard

SOW (Slip-On Welding) and BL (Blind) flanges. 10K, 16K, and 20K pressure classes, 25A to 200A.

SOWBL10K16K20K
59 STEP files · STEP AP214Browse library →

ASME B16.5 Flanges

US / International Standard

Slip-On (RF) and Weld Neck (RF + RTJ) flanges. Class 150 through 1500, NPS ½″ to 16″. WN available in SCH40, SCH80, and solid (no bore).

SOWNRFRTJClass 150–1500
405 STEP files · STEP AP214Browse library →

RTJ Ring Gaskets

ASME B16.20

Type R ring joint gaskets in oval and octagonal cross-sections. R11 through R67, matching ASME B16.5 RTJ flange grooves.

OvalOctagonalR11–R67
96 STEP files · STEP AP214Browse library →

About These Models

  • All models are dimensionally representative for fit and assembly checks.
  • Generated parametrically from standard dimension tables — not hand-modelled.
  • STEP AP214 format, compatible with all major CAD packages (SolidWorks, Inventor, CATIA, NX, FreeCAD, etc.).
  • Not certified drawings — must be independently verified before use in pressure-retaining applications.
  • Free for commercial and non-commercial use.