5/16"-18 Dowel Pins | McMaster-Carr

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	System of Measurement System of Measurement

Inch

	Diameter Diameter

3/8"

1/2"

3/4"

	Length Length

	Head Type Head Type


Plain	Flat

Tapped	Threaded

Headless	Retaining Ring Groove

Through Hole

	Material Material

Steel

Stainless Steel

	Thread Size Thread Size	Show

5/16"-18

	Thread Size Thread Size	Hide

	Shaft Type Shaft Type


Plain	Tapered

D-Profile	Spiral

	End Shape End Shape


Chamfered	Rounded

	End Type End Type


Plain	Threaded

Tapped	Set Screw Flat

	Pin Type Pin Type

	Dowel
	Taper
	Made to Order

	Thread Length Thread Length

1/2"

5/8"

3/4"

	Shaft Diameter Shaft Diameter

5/16"

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

REACH Compliant

	Shoulder Diameter Shoulder Diameter

3/8"

	Breaking Strength Breaking Strength

57,000 lbs.

102,000 lbs.

Not Rated

	Minimum Hardness Minimum Hardness

Rockwell C47

Not Rated

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

RoHS Compliant

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

DFARS Specialty Metals
Compliant

DFARS Specialty Metals
COTS-Exempt

	Shoulder Length Shoulder Length

	Specifications Met Specifications Met

ASME

	Tolerance Rating Tolerance Rating

Standard

	Shaft Length Shaft Length

	Small End Diameter Small End Diameter

75 Products

About Shoulder Screws

About Threaded Studs and Rods

One end of these pins is tapped, and the other is chamfered for easy insertion. To remove, thread a screw or tool into the tapped hole, then pull the pin out. Because they aren't vented, they work best in through holes. Use them as pivots, hinges, shafts, jigs, and fixtures to locate or hold parts. Pins are precision ground for accurate alignment. Breaking strength is measured as double shear, which is the force required to break a pin into three pieces.

Pins that meet ASME B18.8.2 specifications conform to ASME standards for material and dimensions.

Steel pins have good strength. 18-8 stainless steel pins offer a balance of strength and corrosion resistance. They may be mildly magnetic.

For technical drawings and 3-D models, click on a part number.

4140 Alloy Steel Pins

3/4" Dia.
Lg.	Dia. Tolerance	Thread Size	Min. Hardness	Breaking Strength, lbs.	Specifications Met		Each
1 1/2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	00000
2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	0000
2 1/2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	0000
3"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	0000
4"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	0000
1" Dia.
2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	102,000	ASME B18.8.2	000000000	0000
2 1/2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	102,000	ASME B18.8.2	000000000	00000
3"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	102,000	ASME B18.8.2	000000000	00000
4"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	102,000	ASME B18.8.2	000000000	00000

18-8 Stainless Steel Pins

3/4" Dia.
Lg.	Dia. Tolerance	Thread Size	Min. Hardness	Breaking Strength	Specifications Met		Each
1 1/2"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	ASME B18.8.2	000000000	000000
2"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	ASME B18.8.2	000000000	00000
2 1/2"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	ASME B18.8.2	000000000	00000
3"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	ASME B18.8.2	000000000	00000
4"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	ASME B18.8.2	000000000	00000
1" Dia.
2"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	__	000000000	00000
2 1/2"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	__	000000000	00000
3"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	__	000000000	00000
4"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	__	000000000	00000

Optional Insertion and Removal Tools

Use with internally threaded dowel pins. A complete tool requires a puller handle and a tip that fits your pin. You’ll also need a socket head cap screw that can thread into the pin. To use, thread a tip into the puller handle and fit the other end of the tip over the screw. Slide the weight along the handle to push or pull.

Component	For Pin Dia.	Overall Lg.		Each
Puller Handle	__	12 1/4"	000000000	000000
Tip	3/4"-1 1/2" (13-20 mm)	__	000000000	00000
Optional Extension	__	5 1/2"	000000000	00000

Flat-Vent Pull-Out Dowel Pins

The flat side of these pins relieves trapped air, making them easier to insert and remove from blind holes. One end is tapped and the other is chamfered for easy insertion. To remove, thread a screw or tool into the tapped hole, then pull them out. Use them as pivots, hinges, shafts, jigs, and fixtures to locate or hold parts. Pins are precision ground for accurate alignment. Breaking strength is measured as double shear, which is the force required to break a pin into three pieces.

Pins that meet ASME B18.8.2 specifications conform to ASME standards for material and dimensions.

Steel pins have good strength.

18-8 stainless steel pins offer a balance of strength and corrosion resistance. They may be mildly magnetic.

Use puller handles, tips, and optional extensions (sold separately) with some internally threaded dowel pins to create insertion and removal tools. A complete tool requires a puller handle and a tip that fits your pin. You’ll also need a socket head cap screw that can thread into the pin. To use, thread a tip into the puller handle and fit the other end of the tip over the screw. Slide the weight along the handle to push or pull.

For technical drawings and 3-D models, click on a part number.

4140 Alloy Steel Pins

Pins								Puller Handles		Tips		Optional Extensions
Lg.	Dia. Tolerance	Thread Size	Min. Hardness	Breaking Strength, lbs.	Specifications Met		Each		Each		Each		Each
3/4" Dia.
2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	00000	000000000	000000	000000000	000000	000000000	000000
3"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	00000	000000000	00000	000000000	00000	000000000	00000
4"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	00000	000000000	00000	000000000	00000	000000000	00000
1" Dia.
2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	102,000	ASME B18.8.2	000000000	00000	000000000	00000	000000000	00000	000000000	00000
3"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	102,000	ASME B18.8.2	000000000	00000	000000000	00000	000000000	00000	000000000	00000
4"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	102,000	ASME B18.8.2	000000000	00000	000000000	00000	000000000	00000	000000000	00000

18-8 Stainless Steel Pins

Pins								Puller Handles		Tips		Optional Extensions
Lg.	Dia. Tolerance	Thread Size	Min. Hardness	Breaking Strength	Specifications Met		Each		Each		Each		Each
3/4" Dia.
2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	Not Rated	ASME B18.8.2	000000000	000000	000000000	000000	000000000	000000	000000000	000000
3"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	Not Rated	ASME B18.8.2	000000000	00000	000000000	00000	000000000	00000	000000000	00000
1" Dia.
2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	Not Rated	__	000000000	00000	000000000	00000	000000000	00000	000000000	00000
3"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	Not Rated	__	000000000	00000	000000000	00000	000000000	00000	000000000	00000

Spiral-Vent Pull-Out Dowel Pins

A spiral groove cut into these pins relieves trapped air but stays in 360° contact with the hole for a secure fit that's easy to insert in and remove from blind holes. One end is tapped and the other is chamfered for easy insertion. To remove, thread a screw or tool into the tapped hole, then pull them out. Use them as pivots, hinges, shafts, jigs, and fixtures to locate or hold parts. Pins are precision ground for accurate alignment. Breaking strength is measured as double shear, which is the force required to break a pin into three pieces.

Pins that meet ASME B18.8.2 specifications conform to ASME standards for material and dimensions.

Steel pins have good strength.

18-8 stainless steel pins offer a balance of strength and corrosion resistance. They may be mildly magnetic.

For technical drawings and 3-D models, click on a part number.

4140 Alloy Steel Pins

3/4" Dia.
Lg.	Dia. Tolerance	Thread Size	Min. Hardness	Breaking Strength, lbs.	Specifications Met		Each
2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	000000
2 1/2"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	00000
3"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	00000
4"	0.0001" to 0.0003"	5/16"-18	Rockwell C47	57,000	ASME B18.8.2	000000000	00000

18-8 Stainless Steel Pins

3/4" Dia.
Lg.	Dia. Tolerance	Thread Size	Min. Hardness	Breaking Strength	Specifications Met		Each
2"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	ASME B18.8.2	000000000	000000
2 1/2"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	ASME B18.8.2	000000000	00000
3"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	ASME B18.8.2	000000000	00000
4"	0.0001" to 0.0003"	5/16"-18	Not Rated	Not Rated	ASME B18.8.2	000000000	00000

Optional Insertion and Removal Tools

Component	For Pin Dia.	Overall Lg.		Each
Puller Handle	__	12 1/4"	000000000	000000
Tip	3/4"-1 1/2" (13-20 mm)	__	000000000	00000
Optional Extension	__	5 1/2"	000000000	00000

Tapped Taper Pins

These internally threaded pins sit flush in an assembly. For easy removal from a blind hole, thread a screw into the pin and pull out. Often used for positioning components and securing assemblies, they taper at a uniform rate to fit in tapered holes. Use a tapered drill bit that matches the pin number for a snug fit. They have slightly rounded edges to aid insertion.

Pins meet ASME B18.8.2 specifications for material and dimensions.

For technical drawings and 3-D models, click on a part number.

12L14 Carbon Steel
Lg.	Small End Dia.	Rate of Taper	Thread Lg.	Thread Size	Specifications Met		Each
Pin Number 7—0.409" Large End Dia.
3"	0.347"	1/4" per 12"	1/2"	5/16"-18	ASME B18.8.2	000000000	000000
4"	0.326"	1/4" per 12"	1/2"	5/16"-18	ASME B18.8.2	000000000	00000
Pin Number 8—0.492" Large End Dia.
3"	0.43"	1/4" per 12"	1/2"	5/16"-18	ASME B18.8.2	000000000	00000
4"	0.409"	1/4" per 12"	1/2"	5/16"-18	ASME B18.8.2	000000000	00000

Made-to-Order Pins

Choose a material, head type, end type, and size to create a custom pin.

Steel pins have good strength.

Stainless steel pins are more corrosion resistant than steel pins. 18-8 stainless steel pins offer a balance of strength and corrosion resistance. They may be mildly magnetic. 416 stainless steel pins are more wear-resistant than other stainless pins. They have some corrosion resistance and are magnetic.

Plain × Tapped

Tapped

						Each
Dia.	Choose a Material	Choose a Lg.	Choose a Thread Size	Thread Lg.		1-4	5-9	10-Up
1/2"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	5/16"-18, 3/8"-16	1/2"	00000000	000000	000000	000000

Plain × Threaded

Threaded

Length refers to the unthreaded portion of the pin.

						Each
Dia.	Choose a Material	Choose a Lg.	Thread Size	Thread Lg.		1-4	5-9	10-Up
3/8"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	5/16"-18	1/2"	00000000	000000	000000	000000

Retaining Ring Groove × Tapped

Retaining Ring Groove

Tapped

									Each
Dia.	Choose a Material	Choose a Lg.	Choose a Groove Wd.	Choose a Groove Dia.	Choose a Distance from Groove Edge to Pin End	Choose a Thread Size	Thread Lg.		1-4	5-9	10-Up
1/2"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	Min. of 0.03"	0.44"-0.499"	Min. of 0.25"	5/16"-18, 3/8"-16	1/2"	00000000	0000000	000000	000000

Retaining Ring Groove × Threaded

Retaining Ring Groove

Threaded

Length refers to the unthreaded portion of the pin.

									Each
Dia.	Choose a Material	Choose a Lg.	Choose a Groove Wd.	Choose a Groove Dia.	Choose a Distance from Groove Edge to Pin End	Thread Size	Thread Lg.		1-4	5-9	10-Up
3/8"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	Min. of 0.03"	0.315"-0.374"	Min. of 0.25"	5/16"-18	1/2"	00000000	0000000	000000	000000

Through Hole × Tapped

Tapped

Through Hole

								Each
Dia.	Choose a Material	Choose a Lg.	Choose a Through Hole Dia., in.	Choose a Distance from Center of Hole to Pin End	Choose a Thread Size	Thread Lg.		1-4	5-9	10-Up
1/2"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	11/64, 13/64, 15/64	Min. of 0.25"	5/16"-18, 3/8"-16	1/2"	00000000	0000000	000000	000000

Through Hole × Threaded

Threaded

Through Hole

Length refers to the unthreaded portion of the pin.

								Each
Dia.	Choose a Material	Choose a Lg.	Choose a Through Hole Dia., in.	Choose a Distance from Center of Hole to Pin End	Thread Size	Thread Lg.		1-4	5-9	10-Up
3/8"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	9/64, 5/32	Min. of 0.25"	5/16"-18	1/2"	00000000	0000000	000000	000000

Tapped × Tapped

Tapped

							Each
Dia.	Choose a Material	Choose a Lg.	Choose a Thread Size for First Pin End	Choose a Thread Size for Second Pin End	Thread Lg.		1-4	5-9	10-Up
1/2"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	5/16"-18, 3/8"-16	5/16"-18, 3/8"-16	1/2"	00000000	0000000	000000	000000

Tapped × Threaded

Tapped

Threaded

Length refers to the unthreaded portion of the pin.

								Each
Dia.	Choose a Material	Choose a Lg.	Choose a Tapped End Thread Size	Tapped End Thread Lg.	Threaded End Thread Size	Threaded End Thread Lg.		1-4	5-9	10-Up
3/8"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	1/4"-20, 10-32	1/2"	5/16"-18	1/2"	00000000	0000000	000000	000000
1/2"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	5/16"-18, 3/8"-16	1/2"	3/8"-16	5/8"	00000000	000000	00000	00000

Tapped × Set Screw Flat

Set Screw Flat

Tapped

									Each
Dia.	Choose a Material	Choose a Lg.	Choose a Thread Size	Thread Lg.	Flat Dp.	Choose a Distance from Flat Edge to Pin End	Choose a Flat Wd.		1-4	5-9	10-Up
1/2"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	5/16"-18, 3/8"-16	1/2"	0.062"	Min. of 0.25"	Min. of 1/8"	00000000	0000000	000000	000000

Threaded × Threaded

Threaded

Length refers to the unthreaded portion of the pin.

						Each
Dia.	Choose a Material	Choose a Lg.	Thread Size	Thread Lg.		1-4	5-9	10-Up
3/8"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	5/16"-18	1/2"	00000000	0000000	000000	000000

Threaded × Set Screw Flat

Set Screw Flat

Threaded

Length refers to the unthreaded portion of the pin.

									Each
Dia.	Choose a Material	Choose a Lg.	Thread Size	Thread Lg.	Flat Dp.	Choose a Distance from Flat Edge to Pin End	Choose a Flat Wd.		1-4	5-9	10-Up
3/8"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	1/4"-5"	5/16"-18	1/2"	0.062"	Min. of 0.25"	Min. of 1/8"	00000000	0000000	000000	000000

Flat-Head Made-to-Order Pins

Create a custom headed pin with your choice of material, dimensions, and end type.

Steel pins have good strength.

Tapped

					Head			Each
Dia.	Choose a Material	Choose a Lg.	Choose a Thread Size	Thread Lg.	Ht.	Dia.		1-4	5-9	10-Up
1/2"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	5/16"-5"	5/16"-18, 3/8"-16	1/2"	5/32"	5/8"	00000000	0000000	000000	000000

Threaded

					Head			Each
Dia.	Choose a Material	Choose a Lg.	Thread Size	Thread Lg.	Ht.	Dia.		1-4	5-9	10-Up
3/8"	1144 Carbon Steel, 18-8 Stainless Steel, 416 Stainless Steel	5/16"-5"	5/16"-18	1/2"	1/8"	1/2"	00000000	0000000	000000	000000

Partially Threaded Studs

Use the unthreaded end as a pivot point, hinge, shaft, or locator pin. Made from 18-8 stainless steel, these studs are chemical resistant and may be mildly magnetic.

For technical drawings and 3-D models, click on a part number.

		Shaft
Lg.	Thread Lg.	Lg.	Dia.	Dia. Tolerance	Tensile Strength, psi	Hardness		Each
18-8 Stainless Steel
5/16"-18
1"	1/2"	1/2"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	00000
1 1/2"	3/4"	3/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	0000
2"	3/4"	1 1/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	0000
2 1/2"	3/4"	1 3/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	0000
3"	3/4"	2 1/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	0000
3 1/2"	3/4"	2 3/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	0000
4"	3/4"	3 1/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	0000
4 1/2"	3/4"	3 3/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	00000
5"	3/4"	4 1/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	00000
5 1/2"	3/4"	4 3/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	00000
6"	3/4"	5 1/4"	5/16"	-0.005" to 0.005"	70,000	Not Rated	000000000	00000

Headless Alloy Steel Precision Shoulder Screws

Without a head to get in the way, these screws fit in tight spaces where standard shoulder screws cannot. Either thread them in a countersunk hole for a flush mount, or install them with the shoulder sticking out to use them as pins or dowels for aligning and locating components. With a shoulder diameter that is more precise than our general purpose shoulder screws, these screws are a good choice for measuring devices, optical fixtures, laboratory equipment, and other applications where precision matters. Made of alloy steel, they are strong and resist wear.

For technical drawings and 3-D models, click on a part number.

3/8" Shoulder Dia.—Precise Fit (-0.001" to 0" Dia. Tolerance)
Shoulder Lg.	Thread Size	Thread Lg.	Pkg. Qty.		Pkg.
1/4"	5/16"-18	1/2"	1	000000000	00000
3/8"	5/16"-18	1/2"	1	000000000	0000
1/2"	5/16"-18	1/2"	1	000000000	0000
5/8"	5/16"-18	1/2"	1	000000000	0000
3/4"	5/16"-18	1/2"	1	000000000	0000
1"	5/16"-18	1/2"	1	000000000	0000

Swiveling Locating and Support Buttons

The swiveling tip supports uneven and angled surfaces on workpieces and fixtures. These buttons screw into a threaded hole. Also known as rest buttons.

For technical drawings and 3-D models, click on a part number.

	Head				Thread
Tip Dia.	Lg.	Wd.	Tip-to-Head Lg.	Lg.	Size	Lg.	Range of Motion	Head Lg. Tolerance	Load Capacity, lbs.	Tip Material		Each
Steel
7/16"	3/8"	1/2"	1/8"	1/2"	5/16"-18	1/2"	28°	-0.002" to 0.002"	2,750	Stainless Steel	0000000	000000