UNC Bolts | McMaster-Carr

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System of Measurement

Thread Size

Length

Material

Threading

Threaded on Both Ends

Fastener Head Type

Finish

Corrosion-Resistant Coated

Dyed

Galvanic Barrier Coated

Galvanized

Hot-Dipped Galvanized

Fastener Strength Grade/Class

Drive Style

Spring Plunger Driver

Square

Tamper-Resistant Hex

Tamper-Resistant Torx

Tamper-Resistant Torx Plus

Head Width

Thread Spacing

Thread Direction

Head Height

Specifications Met

Federal Specification

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

Socket Head Profile

Thread Fit

ASME Interference Class 5

Metric Class 6g

Metric Class 6H

Metric Interference Sk6

Unified Standard Class 1A

Unified Standard Class 1B

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Grip Length

Head Diameter

Screw Features

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

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

Yes

Export Control Classification Number (ECCN)

34,969 Products

Fastening and Joining

Hex Head Screws

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

6,290 products

Socket Head Screws

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

3,218 products

Flat Head Screws

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

3,390 products

Rounded Head Screws

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

5,581 products

Carriage Bolts

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

756 products

Thumb Screws

Tighten and loosen by hand without the need for tools

938 products

Shoulder Screws

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

3,721 products

12-Point Screws

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

110 products

Tapping Screws

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

669 products

Set Screws

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

2,451 products

Square Head Screws

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

145 products

T-Bolts

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

17 products

Elevator Bolts

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

153 products

Oval Head Screws

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

188 products

Plow Bolts

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

50 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

39 products

Pentagon Head Screws

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

17 products

Studs

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

380 products

Hold-Down Bolts

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

21 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

162 products

Joint Clamps for Wood

Make secure joints between boards, butcher blocks, and countertops

3 products

Wood Screws

Fasten material to wood or pieces of wood to each other

38 products

Threaded Rods

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

3,100 products

Binding Barrels

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

773 products

Anchors

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

743 products

Single-End Studs

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

90 products

Rivet Nuts

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

229 products

Weld Nuts

Weld to metal surfaces to add permanent threads

254 products

Standoff Caps

Create a finished look on standoffs and protect them from dirt and debris

66 products

Thread Adapters

Join threads of a different type, size, and gender

17 products

Spring Plungers

Apply accurate, consistent pressure for positioning, indexing, and ejecting parts

682 products

Fabricating and Machining

Setup Studs

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

627 products

Electrical Power, Networking, and Controlling

Grounding Lugs

Create a common grounding path for internal components and circuits, as well as the enclosure body

1 product

Power Transmission

Linear Drive Nuts

Create a linear positioning system on a rotary shaft without a lead screw

3 products