Representation of springs; crossbows

Roskas

2d screw

Screwdriver

whitworth thread

metric thread

philips screw

Bearing ucfl 30 mm 3d

simple 3d model

3d mechanical part

Mechanic piece

3d nut

Rivets and screws pdf

Screws – bolts – nails

Piston

chain transmission

3d bolt and spring

Drawing piece 3d – autocad

3d tool

3d barrette

Representation and designation of metric threads