Slotted Thumb Screws | McMaster-Carr

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About Shoulder Screws

Slotted Stainless Steel Low-Profile
Knurled-Head Thumb Screws

These slotted thumb screws have a thin, knurled head for use in low-clearance applications. Made of 18-8 stainless steel, they are chemical resistant.

Slotted Narrow Knurled-Head Thumb Screws

These slotted thumb screws are slim to fit in tight spaces.

Nylon Thumb Screws with Slotted Drive

These nylon thumb screws are chemical resistant, nonconductive, and lightweight.

Captive Panel Screws

Thumb-Screw-Head Captive Panel Screws

Install these thumb-screw-head screws through a hole and thread on a retainer to keep secure—no special tools are required.

Rounded Head Captive Panel Screws

Install these rounded head screws through a hole and thread on a retainer to keep secure—no special tools are required.

Flush-Mount Press-Fit Captive Panel Screws

These screws mount flush against the outer panel's surface for low-clearance applications.

Rounded Head Quarter-Turn Captive
Panel Screws with Front Press-Fit Nut

Press these rounded head nuts into a closed-end hole or thick panel in applications where the back of the panel is inaccessible. A quarter-turn locks and releases access panels, doors, and covers.

Rounded Head Quarter-Turn Captive
Panel Screws with Back Press-Fit Nut

Press these rounded head nuts into the backside of a panel in applications where you have access to both sides of the panel. A quarter-turn locks and releases access panels, doors, and covers.

Rounded Head Quarter-Turn Captive
Panel Screws with Rivet-Mount Nut

These rounded head nuts can be riveted into thin panels for a flush fit. They can be mounted without spaces between the panels. A quarter-turn locks and releases access panels, doors, and covers.

Rounded Head Quarter-Turn Captive
Panel Screws with Clip-On Nut

These rounded head screws have a nut that clips onto the edge of a thin panel, allowing you to mount the screw near edges. A quarter-turn locks and releases access panels, doors, and covers.

Shoulder Screws

Metric Slotted Low-Profile Steel Shoulder Screws

With a reduced head size and an unthreaded shoulder, use these screws as a shaft or dowel pin for small rotating parts in low-clearance applications.

Slotted 18-8 Stainless Steel
Precision Shoulder Screws

Metric Slotted 18-8 Stainless
Steel Precision Shoulder Screws

With a shoulder that’s twice as precise as standard shoulder screws, these metric shoulder screws act as a shaft or axle for bearings and other moving parts in applications that require smooth and accurate movement, such as measuring and lab equipment. Made of 18-8 stainless steel, they’re nearly as strong as steel but won’t rust in outdoor or washdown environments.

Headless Alloy Steel Precision Shoulder Screws

Without a head to get in the way, these screws fit in tight spaces where standard shoulder screws cannot. Either thread them in a countersunk hole for a flush mount, or install them with the shoulder sticking out to use them as pins or dowels for aligning and locating components.

Slotted Ultra-Low-Profile Precision Shoulder Screws

These slotted screws have a head height about one-third the head height of a standard shoulder screw. Use them in low-clearance applications such as inside machines.