The primary duty of Inch Slotted Shoulder Screws is locating moving parts on a defined shoulder with a slotted head. Below: the sectors that specify them in volume, the checklist used to select the right size and material for the application, installation notes, and the known limits of the type. Stocked across roughly 12 to 38, they cover heavy and structural work.
Typical Applications for Inch Slotted Shoulder Screws
The most common settings where these are specified:
- Linkage mechanisms: slotted-head shoulder screws used as pivots and bearing shoulders.
- Tooling fixtures: replaceable guide and stop points in jigs.
- Camera mounts: controlled shoulder length where axial position matters.
- Light machinery: wear-resistant pivot hardware assembled with a slot driver.
How to Specify Inch Slotted Shoulder Screws for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans 12–38; check the full table below for the exact dimensions of each size.
- Strength class: Choose the property class (e.g. 8.8, 10.9, 12.9 or A2/A4 stainless) for the load and environment, and tighten to the matching torque so the joint relies on preload, not friction.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This product is supplied to Trade series (inch shoulder screws). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Installation & Assembly Practice
- Tighten to the torque for the size and property class with a calibrated wrench — the joint is held by preload, not by the thread friction alone.
- Ensure at least one full thread projects beyond the nut after tightening, and never re-use a bolt that has been tightened into yield.
- Under slotted or oversized holes, fit a hardened washer so the preload does not relax into the hole edge.
Common Selection Mistakes with Inch Slotted Shoulder Screws
- Specifying class 12.9 "to be safe" in a corrosive environment — high classes are more sensitive to hydrogen embrittlement and stress corrosion; 8.8 hot-dip galvanized often outlasts them outdoors.
- Choosing a length that puts the shear plane through the threaded portion when a plain shank (partially threaded bolt) was available.
- Mixing stainless bolts with plated-steel nuts: the joint loses its corrosion logic and can gall or seize.
Where Inch Slotted Shoulder Screws Are Not the Right Choice
Not for permanent joints that will never be opened (a rivet or weld is cheaper), and not where the head must sit flush — use a countersunk screw instead.
