3/8"-16 Fasteners | McMaster-Carr

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System of Measurement

Thread Size

Length

Material

Fastener Head Type

Threading

Threaded on Both Ends

Finish

Cadmium Yellow-Chromate Plated

Chrome Plated

Copper Plated

Corrosion-Resistant Coated

Galvanized

Hot-Dipped Galvanized

Drive Style

Tamper-Resistant Torx

Torx

Torx Plus

Tri-Groove

Fastener Strength Grade/Class

Thread Direction

Right Hand and Left Hand

Thread Type

Thread Spacing

Socket Head Profile

Specifications Met

Federal Specification

Head Height

Tensile Strength

10,000 psi to 19,999 psi

20,000 psi to 29,999 psi

30,000 psi to 99,999 psi

100,000 psi or greater

Not Rated

Thread Fit

Acme Class 2C

ASME Interference Class 5

Metric Class 6g

Metric Class 6G

Metric Class 6H

Unified Standard Class 1A

Unified Standard Class 1B

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

DFARS Specialty Metals

Head Width

Drive Size

Thread Length

RoHS

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

6,046 Products

Fastening and Joining

Hex Head Screws

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

987 products

Socket Head Screws

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

386 products

Rounded Head Screws

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

265 products

Flat Head Screws

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

252 products

Pentagon Head Screws

Create a tamper-resistant joint with a head than can only be removed with a 5-point socket

10 products

Shoulder Screws

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

448 products

Tapping Screws

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

42 products

Carriage Bolts

A smooth head provides a finished look while a square neck keeps the bolt in place when using a nut

168 products

Set Screws

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

271 products

12-Point Screws

12 contact points handle more torque than a hex head while a flange eliminates the need for a washer

22 products

Elevator Bolts

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

37 products

Plow Bolts

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

6 products

Thumb Screws

Tighten and loosen by hand without the need for tools

118 products

T-Bolts

Turn by hand for easy fastening, use as a handle, or attach as a point for straps and clamps

6 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

9 products

Square Head Screws

Turn the large flat sides with a wrench into square holes that stop further rotation

22 products

Studs

Press, weld, or screw in place to add a threaded fastening point

30 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

7 products

Hold-Down Bolts

Hold material under the bent head while the other end is tightened down with a nut

1 product

Oval Head Screws

The domed top sits slightly above the surface of countersunk holes for a decorative look

4 products

Hex Nuts

Handle most general fastening needs

115 products

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

10 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

65 products

Flange Nuts

The flange distributes pressure, so you don't need a washer

38 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

33 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

32 products

Coupling Nuts

Connect and extend threaded rods

36 products

Square Nuts

Flat sides won’t spin in channels and square holes

12 products

Push-Button Nuts

Disengage the threads to quickly slide along threaded rods

3 products

Split Nuts

Swivel to attach at any point on a threaded rod for quick installation

2 products

Socket Nuts

Install in recessed holes and tight spots where a wrench won’t fit; also known as Allen nuts

2 products

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

2 products

Clip-On Nuts

Slide onto the edge of thin panels to create a fastening point

6 products

Threaded Inserts

Create new threads or repair stripped threads

227 products

Rivet Nuts

Add threads to thin panels with access from only one side; also known as blind inserts

33 products

Screw-Mount Nuts

Mount with screws, rivets, and nails to add threads to a surface

4 products

Adhesive-Mount Nuts

Attach threads to material that’s too thin for a threaded insert

8 products

Dowel Nuts

Form joints in blind holes in wood

1 product

Weld Nuts

Weld to metal surfaces to add permanent threads

30 products

Snap-In Nuts

Push into square holes in thin materials to add bolts for aligning off-center parts

7 products

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

8 products

Tube-Connecting Nuts

Push inside tubes to join them with a threaded stud instead of welding

2 products

Push Nuts

Press onto threads for a light duty hold that’s faster to install than typical nuts

1 product

Standoffs

Separate, position, or connect components in assemblies

82 products

Anchors

Secure anything from signs to heavy machinery in concrete, brick, and drywall

142 products

Threaded Rods

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

390 products

Binding Barrels

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

28 products

Quick-Release Pin Receptacles

Secure quick-release pins when you don’t have a through hole

1 product

Quick-Release Pins

Fasten or remove components on equipment with a spring-loaded retaining ball

3 products

Dowel Pins

Align parts before assembly or use as a pivot, shaft, or hinge to join moving components

9 products

Taper Pins

Fit snugly into tapered holes to secure, position, and align components

2 products

Thread Adapters

Join threads of a different type, size, and gender

321 products

Single-End Studs

Use the unthreaded end as a pivot point, hinge, shaft, or locator pin

11 products

Rivet Tools

Install and remove blind, solid, hollow, and other types of rivets

Threaded Insert Installation Tools

Install helical, key-locking, slotted-drive, and other threaded inserts

55 products

Anchor Installation Tools

Drive with a hammer to expand and secure anchors in place

5 products

Magnets

Attract or repel metal objects to hang, secure, or position them

4 products

Material Handling

U-Bolts

Anchor heavy pipe, tube, and conduit; stronger than routing clamps and hangers

337 products

U-Bolt Plates

Reinforce mounted U-bolts for a more secure hold

56 products

Routing Rings

Suspend wire and cable by feeding it through the eyehole

4 products

Routing Clamps

Secure routed lines of pipe, tubing, and conduit

66 products

Eyebolts

Route rope through the loop or attach hooks and shackles for lifting

129 products

Hoist Rings

Pivot to resist stress that would bend or break an eyebolt when lifting at an angle

15 products

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

8 products

Turnbuckles

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

66 products

Fabricating and Machining

T-Slot Bolts

Secure clamps and workpieces to machine tables with quicker setup than a T-slot nut and stud

22 products

T-Slot Nuts

Combine with setup studs or bolts to mount fixtures to machine tables

28 products

Fixture Clamps

Secure your workpiece to a fixture table so it won't move during machining

33 products

Fixture Kits

Everything needed to mount workpieces of different sizes to your machine table

6 products

Setup Studs

Secure setup clamps and fixtures to your machine table or assemble heavy machines

47 products

C-Clamps

Temporarily secure workpieces together or to a work surface

17 products

Toggle Clamps

Lock workpieces onto worktables or objects

25 products

Clamping Screw Mounting Bases

Thread clamping screw clamps into the holes to hold workpieces

1 product

Clamping Screw Clamps

Mount in a base or through a threaded hole, then tighten the tip to hold a workpiece in place

6 products

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

92 products

Cam Handles

For fast clamping, push down on the handle to draw two parts together

8 products

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

5 products

Machine Handles

Arms give you extra leverage to secure and position jigs, fixtures, and other equipment

2 products

Strut Channel Nuts

Fasten on threaded rod to connect components to strut channel

32 products

Leveling Mount Inserts

Slip onto equipment and furniture to add threaded-stud leveling feet

27 products

Electrical Power, Networking, and Controlling

Battery Terminal Fasteners

Replace bolts in battery terminals

1 product

Battery Terminal Adapters

Convert one battery terminal style to another

5 products

Battery Terminals

Connect cable to battery posts to power vehicles and machines

1 product

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

1 product

Terminal Covers

Block out dirt and corrosion to protect battery terminals

2 products

Facility and Grounds Maintenance

Toilet Seat Fasteners

Secure toilet seat hinges to your toilet bowl

1 product

Power Transmission

Rod Ends

Use with connecting rods to support loads and control steering, tensioning, or pivoting motion

64 products

Connecting Rods

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

20 products

Lead Screw Collars

Position components and limit travel along a lead screw

3 products

Precision Lead Screws and Nuts

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

23 products

Fluid Handling

Float Rods

Connect valve bodies and floats to build or repair a float valve

2 products