Left-Hand Threaded Screws | McMaster-Carr

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1,312 Products

Fastening and Joining

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

Rounded Head Screws

Rounded Head Screws

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

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish

Shoulder Screws

Shoulder Screws

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

Threaded Rods

Anchor, connect, or hang components in a wide variety of applications

Weld Nuts

Weld to metal surfaces to add permanent threads

Power Transmission

Lead Screws

Pair with lead screw nuts to move components in a straight line

Lead Screw Nuts

Lead Screw Nuts

Mate with lead screws to move components in a straight line

Lead Screw Collars

Lead Screw Collars

Position components and limit travel along a lead screw

Connecting Rods

Connecting Rods

Use with rod ends and swivel joints to link components in push/pull assemblies

Ball Screws and Nuts

Ball Screws and Nuts

Internal ball bearings roll on screws for low friction when moving components at high speeds

Fabricating and Machining

Lathe Tool Insert Holder Replacement Parts

Lathe Tool Insert Holder Replacement Parts

Replace clamps, screws, shims, and other parts in lathe tool insert holders

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

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