Left Hand Screws | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Thread Type Thread Type

	Thread Direction Thread Direction	Show

Left Hand

	Thread Direction Thread Direction	Hide

Right Hand

Left Hand

Right Hand and Left Hand

	Length Length

	Head Type Head Type


Socket	Rounded

Hex	Flat

	Material Material

	Threading Threading

Fully Threaded

Partially Threaded

Threaded on Both Ends

	Socket Head Profile Socket Head Profile

	Standard

	Drive Style Drive Style


Hex	External Hex

	Finish Finish

Black Oxide

Passivated

Zinc Plated

Zinc Yellow-Chromate Plated

	Head Height Head Height

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Head Diameter Head Diameter

	Thread Fit Thread Fit

	Thread Spacing Thread Spacing

Coarse

Fine

	Tensile Strength Tensile Strength

	Specifications Met Specifications Met

	Hardness Hardness

	Drive Size Drive Size

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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859 Products

Selecting Compatible Lead Screws and Nuts

Left-Hand Threaded Alloy Steel Socket Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening.

Left-Hand Threaded 18-8 Stainless
Steel Socket Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, these screws have good chemical resistance.

Left-Hand Threaded Button Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion. Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic.

Metric Left-Hand Threaded Button Head Screws

Turn these metric screws to the left to tighten; once fastened, they prevent loosening from counterclockwise motion. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Left-Hand Threaded High-Strength
Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. For use in high-strength fastening applications.

Left-Hand Threaded Medium-Strength
Metric Class 8.8 Steel Hex Head Screws

These metric screws help prevent counterclockwise-moving parts from loosening. Use them for medium-strength fastening.

Left-Hand Threaded Medium-Strength
Grade 5 Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. For use in medium-strength fastening applications.

Left-Hand Threaded 18-8
Stainless Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, these screws have good chemical resistance.

Metric Left-Hand Threaded Flat Head Screws

Tighten these metric screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion.

Left-Hand Threaded Flat Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion.

Left-Hand Threaded Shoulder Screws

Tighten these shoulder screws by turning them to the left; once fastened, they resist loosening from counterclockwise motion.

Threaded Rods

Left-Hand Threaded Medium-Strength
Steel Threaded Rods—Grade B7

Tighten these threaded rods by turning them to the left; once fastened, they resist loosening from counterclockwise motion.

Metric Left-Hand Threaded
Low-Strength Steel Threaded Rods

These metric threaded rods tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion. About half the strength of medium-strength steel threaded rods, use them for light duty hanging, mounting, and fastening.

Left-Hand Threaded Low-Strength
Steel Threaded Rods

Tighten these threaded rods by turning them to the left; once fastened, they resist loosening from counterclockwise motion. About half the strength of medium-strength steel threaded rods, use them for light duty hanging, mounting, and fastening.

Left-Hand Threaded 18-8
Stainless Steel Threaded Rods

Tighten these threaded rods by turning them to the left; once fastened, they resist loosening from counterclockwise motion.

Left-Hand Threaded Super-Corrosion-Resistant
316 Stainless Steel Threaded Rods

Tighten these threaded rods by turning them to the left; once fastened, they resist loosening from counterclockwise motion.

Left-Hand Threaded-Stud Knobs

Knobs have left-hand threads; they're used in applications where counterclockwise motion can loosen common right-hand threads. Mount them into a threaded hole to position, tighten, and hold fixtures, equipment, and machinery.

Lead Screws and Screw Jacks

Precision Acme Lead Screws and Nuts

Also known as single-start and self-locking lead screws and nuts, these have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won't unexpectedly move when the lead screw is at rest.

Fast-Travel Precision Acme Lead Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start.

Acme Lead Screws and Nuts

Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects.

Clamping Acme Lead Screw Collars

Thread these one-piece collars onto an Acme lead screw.

Ball Screws and Nuts

Also known as single-start ball screws and nuts, these have a single thread that runs the length of the screw. They operate with more torque than fast-travel ball screws and nuts.

Screws for Carbide Insert Holders

When it's time to replace the screws in a carbide insert holder, use the reference number on your holder to find the right size.

Selecting Compatible Lead Screws and Nuts

Screws and Bolts

Left-Hand Threaded Alloy Steel Socket Head Screws

Left-Hand Threaded 18-8 StainlessSteel Socket Head Screws

Left-Hand Threaded Button Head Screws

Metric Left-Hand Threaded Button Head Screws

Left-Hand Threaded High-StrengthSteel Hex Head Screws

Left-Hand Threaded Medium-StrengthMetric Class 8.8 Steel Hex Head Screws

Left-Hand Threaded Medium-StrengthGrade 5 Steel Hex Head Screws

Left-Hand Threaded 18-8Stainless Steel Hex Head Screws

Metric Left-Hand Threaded Flat Head Screws

Left-Hand Threaded Flat Head Screws

Left-Hand Threaded Shoulder Screws

Threaded Rods

Left-Hand Threaded Medium-StrengthSteel Threaded Rods—Grade B7

Metric Left-Hand ThreadedLow-Strength Steel Threaded Rods

Left-Hand Threaded Low-StrengthSteel Threaded Rods

Left-Hand Threaded 18-8Stainless Steel Threaded Rods

Left-Hand Threaded Super-Corrosion-Resistant316 Stainless Steel Threaded Rods

Left-Hand Threaded-Stud Knobs

Left-Hand Threaded-Stud Knobs

Lead Screws and Screw Jacks

Precision Acme Lead Screws and Nuts

Fast-Travel Precision Acme Lead Screws and Nuts

Acme Lead Screws and Nuts

Clamping Acme Lead Screw Collars

Ball Screws and Nuts

Screws for Carbide Insert Holders

Screws for Carbide Insert Holders

Left-Hand Threaded 18-8 Stainless
Steel Socket Head Screws

Left-Hand Threaded High-Strength
Steel Hex Head Screws

Left-Hand Threaded Medium-Strength
Metric Class 8.8 Steel Hex Head Screws

Left-Hand Threaded Medium-Strength
Grade 5 Steel Hex Head Screws

Left-Hand Threaded 18-8
Stainless Steel Hex Head Screws

Left-Hand Threaded Medium-Strength
Steel Threaded Rods—Grade B7

Metric Left-Hand Threaded
Low-Strength Steel Threaded Rods

Left-Hand Threaded Low-Strength
Steel Threaded Rods

Left-Hand Threaded 18-8
Stainless Steel Threaded Rods

Left-Hand Threaded Super-Corrosion-Resistant
316 Stainless Steel Threaded Rods