Left Hand Threaded Rods | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	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

	Material Material

	Length Length

	Component Component

	Ball Nut
	Ball Screw
	Collar
	Lead Screw
	Nut

	Threading Threading

	Fully Threaded
	Threaded on Both Ends

	Thread Fit Thread Fit

	Thread Spacing Thread Spacing

Coarse

Fine

	Tensile Strength Tensile Strength

50,000 to 99,999 psi

100,000 psi or greater

Not Rated

	Nut Type Nut Type


Hex	Coupling

Flange	Round

Externally Threaded	Square

Platform

	Hardness Hardness

	Thread Pitch Thread Pitch

	Fastener Strength Grade/Class Fastener Strength Grade/Class

ASTM Grade B7

Grade 2

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Specifications Met Specifications Met

ASTM

DIN

ASME

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Number of Thread Starts Number of Thread Starts

	Travel Distance per Turn Travel Distance per Turn

	Speed Ratio Speed Ratio

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

REACH Compliant

	Finish Finish

Black Coated

Black Oxide

Zinc Plated

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612 Products

Selecting Compatible Lead Screws and Nuts

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.

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.

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 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 Low-Strength Steel Coupling Nuts

The left-hand threads on these coupling nuts resists loosening from counterclockwise vibration. Use in light duty applications.

Lead Screws and Screw Jacks

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.

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.

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.

Clamping Acme Lead Screw Collars

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

Standard-Wall Steel Pipe Nipples and Pipe with Right-Hand and Left-Hand Threads

Standard-Wall Steel Pipe Nipples and Pipe
with Right-Hand and Left-Hand Threads

Pipe has clockwise (right-hand) threads on one end and counterclockwise (left-hand) threads on the other end. When you use a wrench to turn, connections on both ends tighten at the same time.

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Selecting Compatible Lead Screws and Nuts

Fasteners

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

Left-Hand Threaded Low-Strength
Steel Threaded Rods

Metric 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