Left-Hand Threads | McMaster-Carr

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Right Hand and Left Hand

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Threaded on Both Ends

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Aluminum Titanium Nitride (AlTiN) Coated

Titanium Aluminum Nitride (TiAlN) Coated

Titanium Carbon Nitride (TiCN) Coated

Titanium Nitride (TiN) Coated

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Zinc Plated

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Fastener Strength Grade/Class

For Use With

Fitting Type

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Fastener Head Type

Thread Fit

Unified Standard Class 1A

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Component

Pipe Size

Shape

3,174 Products

Most Likely Products

Connecting Rods

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

332 products

Threaded Rods

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

149 products

Hex Head Screws

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

116 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

32 products

Thread Adapters

Join threads of a different type, size, and gender

98 products

Hose Fitting Nuts

Connect fittings and compressed-gas nipples to pressure regulators and torches

19 products

Socket Head Screws

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

68 products

Hex Nuts

Handle most general fastening needs

373 products

All Results

Fastening and Joining

Hex Head Screws

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

116 products

Socket Head Screws

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

68 products

Rounded Head Screws

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

36 products

Flat Head Screws

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

20 products

Shoulder Screws

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

88 products

Threaded Rods

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

149 products

Thread Adapters

Join threads of a different type, size, and gender

98 products

Hex Nuts

Handle most general fastening needs

373 products

Coupling Nuts

Connect and extend threaded rods

7 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

5 products

Weld Nuts

Weld to metal surfaces to add permanent threads

64 products

Threaded Inserts

Create new threads or repair stripped threads

22 products

Welding Gas Flashback Arresters

Attach to your gas welder to extinguish flames and stop reverse gas flow

13 products

Propane Torches

Handle brazing, soldering, and heating jobs

2 products

Power Transmission

Connecting Rods

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

332 products

Precision Lead Screws and Nuts

Pair with a motor for accurate starts and stops in automated motion and positioning applications

221 products

Lead Screws and Nuts

Move components in a straight line in clamping and heavy duty lifting and lowering applications

205 products

Gear Worms

Couple with a worm gear to reduce speed while transferring motion at a right angle in one direction

1 product

Lead Screw Collars

Position components and limit travel along a lead screw

3 products

Ball Screws and Nuts

Provide smooth travel where high speeds, accurate positioning, and repeatable movement are required

13 products

Fluid Handling

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

32 products

Hose Fitting Nuts

Connect fittings and compressed-gas nipples to pressure regulators and torches

19 products

Hose End Caps

Cover the ends of hose to keep out dirt and debris

1 product

Hose

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

6 products

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

28 products

Rotary Joints

Transfer air, water, oil, and steam from supply lines to continuously revolving drums and rollers

38 products

Hose Crimpers

Crimp ferrules onto hose to secure fittings

2 products

Check Valves

Permit flow in only one direction by closing when flow stops or reverses

3 products

Mixer Shafts

Replace the shaft on mixers

2 products

Fabricating and Machining

Taps

Cut internal threads for fasteners, pipe, conduit, and more

324 products

Dies

Cut or restore external threads on fasteners, pipe, or conduit

138 products

Thread Mills

Install in a CNC machine to cut a range of internal and external threads with a single tool

29 products

Lathe Tools

Shape workpieces as they rotate on a lathe

79 products

Lathe Tool Insert Holder Replacement Parts

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

15 products

Lathe Tool Inserts

Pair with lathes to add cuts and grooves to workpieces

172 products

Drill Bushings

Fit in holes to guide drill bits and other cutting tools for precise and repeatable holes and cuts

63 products

Material Handling

Turnbuckles

Twist the body or end fittings to adjust the length and tension of attached rope and chain

196 products

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

14 products

Measuring and Inspecting

Plug Gauges

Verify the diameter or threads of machined holes in finished parts; also called pin gauges

58 products

Containers, Storage, and Furniture

Hose Reels

Store hose neatly to remove tripping hazards and reduce wear

5 products