Assembly and Captive Screws

Assembly fasteners help retain washers or the screw itself during installation and maintenance.

SEMS Washer Assembly Screws

Drawing / specification

Specify the screw and washer combination together, then confirm assembly clearance, material, finish and batch demand.

Captive Screws

Drawing / specification

Assembly fasteners help retain washers or the screw itself during installation and maintenance.

At a glance

Products	Standard	Specifications
SEMS Washer Assembly Screws	Drawing / specification	Product family: SEMS Washer Assembly Screws Dimensions and tolerances: To your drawing or agreed specification Material: Carbon steel, alloy steel or stainless steel; selection subject to technical review
Captive Screws	Drawing / specification	Product family: Captive Screws Dimensions and tolerances: To your drawing or agreed specification Material: Carbon steel, alloy steel or stainless steel; selection subject to technical review

Before You Order

How should I specify a fastener for quotation?: Specify head shape, drive, thread, material and finish. We review the drawing and manufacturing requirements before quotation.
What must be confirmed before production?: Order quantity, sample arrangements, inspection and delivery schedule are agreed for each project.

Custom Fastener RFQ Checklist for Factory Bulk Orders Request a Quote

SEMS Screws: Washer Configuration and Factory Ordering

Specify the complete assembly

SEMS ordering starts with the screw head, drive, thread and retained washer configuration. State whether you need a flat washer, a spring washer or a combination. Include washer inside diameter, outside diameter, thickness and order in the assembly.

Check the installed envelope

Check the space occupied by the head and washers, tool access and usable thread length against the mating parts. Retaining the washer helps keep components together during handling; it does not by itself establish resistance to loosening in your application.

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