FF-S-200 Setscrews — Hexagon & Spline Socket, Headless
The specification for FF-S-200 setscrews covers high-strength headless setscrews equipped with hexagon or spline socket drives. These Federal Specification fasteners are used to accurately locate machine parts relative to one another—such as securing collars or gears to a shaft—without a protruding head. Together with FF-S-210, it officially superseded the earlier consolidated FF-S-103 standard.
At a Glance
FF-S-200 Setscrews Overview
FF-S-200 covers headless setscrews driven by an internal socket, either a standard hex or a high-torque spline. Because they lack a standard head, these fasteners can be driven entirely below the surface of the mating part, ensuring they do not interfere with rotating or moving assemblies.
These specialized components draw their dimensional and drive geometry directly from ASME B18.3, the same standard referenced for socket cap screws. By splitting the older FF-S-103 standard, the government separated these socket-driven headless setscrews from the square head and slotted versions (which are now governed by FF-S-210). To verify current revisions and detailed specification history, contractors frequently consult the Defense Logistics Agency (DLA) portal.
Drive Configurations & Hardness
Engineers can specify either hexagon socket setscrews for universal tool compatibility, or spline socket setscrews for applications demanding maximum torque transfer without stripping the internal recess. Because they rely heavily on compressive force, these screws are heat-treated to achieve a typical hardness rating of 25–45 Rockwell C, preventing deformation during installation.
Point Style Guide
The standard recommends specific point styles depending on the shaft material and desired holding power.
FF-S-200 (socket-drive) and FF-S-210 (square head and slotted headless) together replaced the earlier consolidated setscrew specification, FF-S-103.
Frequently Asked Questions
Which point style should I use for a general setscrew application?
A cup point (Style 4) is highly recommended wherever practical for its superior holding power. Use flat or half-dog points for hardened shafts or where surface marring is a concern.
What's the difference between FF-S-200 and FF-S-210?
FF-S-200 covers headless setscrews with an internal hexagon or spline socket drive. FF-S-210 covers square-head setscrews and slotted headless setscrews (inch and metric) instead.
Need FF-S-200 Setscrews to Print?
Ananka Fasteners manufactures compliant hex and spline socket setscrews with full material traceability and Mill Test Certification.
Prefer email? sales@anankafasteners.com
