Lock Screws | McMaster-Carr

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System of Measurement

Thread Size

Length

Material

Stainless Steel

Drive Style

Tamper-Resistant Torx

Fastener Head Type

Threaded Insert Type

Finish

Corrosion-Resistant Coated

Dry Film Lubricated

Phosphate Coated

Zinc Yellow-Chromate Plated

Threading

Partially Threaded

Thread Type

Locking Type

Expanding Sleeve

Thread Pitch

Thread Direction

Installed Length

Less than 0.25"

0.25" to 0.499"

10 mm to 19.9 mm

20 mm to 24.9 mm

25 mm or greater

For Use In

Thread Spacing

Head Diameter

Rounded Head Style

RoHS

Compliant with Exemptions

DFARS Specialty Metals

Specifications Met

Fed. Spec. QQ-P-35

Head Height

Tensile Strength

Less than 20,000 psi

20,000 psi to 39,999 psi

40,000 psi to 49,999 psi

50,000 psi to 99,999 psi

100,000 psi or greater

REACH

Export Control Classification Number (ECCN)

Barrel Length

How can we improve?

8,567 Products

Fastening and Joining

Rounded Head Screws

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

Socket Head Screws

Socket Head Screws

With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold

Hex Head Screws

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

Shoulder Screws

Shoulder Screws

Rotate parts around the cylinder under the head to guide and align them during installation

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Elevator Bolts

Create a flush joint to allow movement in tight spaces such as grain elevators and belting systems

Plow Bolts

The head sits flush with countersunk holes while the bolt stays in place when tightening a nut

Tapping Screws

Fasten a range of materials together without needing to tap the hole first

Joint Clamps for Wood

Joint Clamps for Wood

Make secure joints between boards, butcher blocks, and countertops

Threaded Inserts

Threaded Inserts

Create new threads or repair stripped threads

Binding Barrels

Binding Barrels

Create custom low-profile fasteners with binding barrel posts, caps, and screws

Standoffs

Separate, position, or connect components in assemblies

Fabricating and Machining

Drill Bushing Lock Screws

Drill Bushing Lock Screws

Prevent drill bushings from spinning

Locating Pin Lock Screws

Locating Pin Lock Screws

Secure removable locating pins

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)