Shoulder bolt (stripper bolt)
ISO 7379
Sizes
Shoulder diameters roughly 3-25 mm with a smaller thread below
Drive & head
Internal hex
Materials
Alloy steel, stainless
Strength / grades
12.9 steel; stainless versions take less torque
Hole and pilot guidance
The pivot hole is sized to the shoulder diameter for a running fit; the tapped hole matches the smaller thread.
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Where it is used
Pivots, cam followers and linkages
The ground shoulder acts as an axle for a rotating part
View sourceWatch out for
- Torque is limited by the small thread, not the thick shoulder - it shears easily.
- Shoulder length must match the parts being stacked or the joint will bind or stay loose.
- The shoulder size and the thread size are two different numbers when ordering.