STEP File Library

17 part families · 780 free 3D CAD models

Free STEP (AP214) files for 17 machine-element families — bolts, nuts, beams, pipes and more. Every model is built to real KS/ISO/DIN/JIS dimensions; threads are simplified (plain shank) per free-library convention. No sign-up required.

Hex Bolt

271 files · DIN 931 / KS B 1002

Socket Head Cap Screw

179 files · ISO 4762 / DIN 912 / KS B 1003 / JIS B 1176

Countersunk Socket Screw

96 files · ISO 10642 / DIN 7991 / KS B 1017 / JIS B 1194

Hex Nut

16 files · DIN 934 / KS B 1012

H-Beam

16 files · KS D 3502

I-Beam

7 files · KS D 3502

Carbon Steel Pipe (SGP)

11 files · KS D 3507 / KS D 3576

Stainless Steel Pipe

11 files · KS D 3507 / KS D 3576

Square Steel Tube

59 files · KS D 3568

Rectangular Steel Tube

64 files · KS D 3568

Nylon Lock Nut

6 files · DIN 985

Flange Nut

7 files · DIN 6923

Cap Nut

6 files · DIN 1587 (high form)

Coupling Nut

5 files · DIN 6334

Square Nut

4 files · DIN 557

Round Nut

6 files · DIN 1804 / KS B 1019

Knurled Nut

5 files · DIN 466 (high type)

Rivet Nut

6 files · Manufacturer standard (blind rivet nut, round body)

Plastic Nut

5 files · DIN 934 / ISO 4032 (PA6)

Using these STEP files in CAD

STEP AP214 format opens directly in SolidWorks, Inventor, Fusion, CATIA, NX, FreeCAD, and most CAD systems.
Per free-library convention, threads are not modeled (plain shank). These are for layout, clearance, and drawings — not fastening simulation.
All dimensions use the standard's nominal values. For tolerance-critical use, check the allowances in the spec table.