7/8"-20 Inserts | McMaster-Carr

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17-4 PH Stainless Steel

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Polyethylene

For Tap Thread Size

7/8"-20

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11 Products

Helical Threaded Insert Removal Tools

To remove installed helical inserts, place the tip of these tools into the insert and lightly strike the tool’s head. Then, turn the tool counterclockwise with pressure to extract the insert.

Narrow Profile—The tip of these tools has a narrower angle than standard removal tools to reduce the chance it will dig into your material’s surface when you strike the tool.

	Mfr.		Each
Narrow Profile



	7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 1/2"-28, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 5/8"-24, 3/4"-10, 3/4"-16, 3/4"-20, 7/8"-9, 7/8"-14, 7/8"-20, 1"-8, 1"-12, 1"-14, M12, M14, M16, M18, M20, M22, M24	Heli-Coil	90254A330	000000

Installation Tools for Swage-Locking Threaded Inserts

Set swage-locking inserts into place. Use these installation tools to hand-tighten the insert into the tapped hole. Then hammer the tool to press (or swage) the knurls of the insert into the material. You should choose the tool that matches your insert’s thread size and tap thread size.

For Thread Size	For Tap Thread Size		Each
3/4"-10, 3/4"-16	7/8"-20	6645N114	0000000

Swage-Locking Threaded Inserts

Add strong threads to the edges of soft metal without bulging or cracking the material. These inserts have thinner walls than our key-locking and thread-locking inserts, so they don’t need as much space around them. The knurls press (swage) into the material to keep inserts in place when you tighten or loosen a screw.

To install these inserts, you need a drill bit, a counterbore, a standard tap, an installation tool, and a hammer. Drill a hole, counterbore the top, and tap it. Place the insert into the installation tool, then hand-tighten it into the tapped hole. Strike the tool to secure the insert and drive the knurls into the surrounding material.

High-Strength 17-4 PH Stainless Steel—The strongest stainless steel inserts we offer. They handle high-stress installations, such as pump and compressor housings, and the heavy vibration of aircraft parts. They won’t rust in wet and outdoor environments but can’t withstand the harsh chemicals and acids that 316 stainless steel can.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

	Inserts									Installation Tools
					For Counterbore
	Thread Size	For Tap Thread Size	Installed Lg.	For Max. Hole Dia.	Dia.	Dp.	Mil. Spec.		Each		Each
High-Strength 17-4 PH Stainless Steel



		3/4"-10	7/8"-20	1.125"	0.844"	0.875"	0.156"	MIL-DTL-45932/1	93570A123	000000	6645N114	0000000


		3/4"-16	7/8"-20	1.125"	0.844"	0.875"	0.156"	MIL-DTL-45932/1	93570A124	00000	6645N114	000000

Seize-Resistant Swage-Locking Threaded Inserts

Smoothly install these inserts for strong threads near the edges and corners of soft metal surfaces. They’re lubricated to prevent sticking as you thread them in. Since these have thinner walls than our key-locking and thread-locking inserts, they don’t need as much space and won't bulge or crack the material. The knurls press (swage) into the material to keep inserts in place when you tighten or loosen a screw.

High-Strength Dry-Film-Lubricated Cadmium-Plated Alloy Steel—Stronger than our 17-4 PH stainless steel inserts, these inserts absorb impact without cracking and stand up to high-pressure applications. The cadmium plating prevents corrosion in wet environments.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

	Inserts									Installation Tools
					For Counterbore
	Thread Size	For Tap Thread Size	Installed Lg.	For Max. Hole Dia.	Dia.	Dp.	Mil. Spec.		Each		Each
High-Strength Dry-Film-Lubricated Cadmium-Plated Alloy Steel



		3/4"-10	7/8"-20	1.125"	0.844"	0.875"	0.156"	MIL-DTL-45932/1	93572A123	000000	6645N114	0000000


		3/4"-16	7/8"-20	1.125"	0.844"	0.875"	0.156"	MIL-DTL-45932/1	93572A124	00000	6645N114	000000

Antistatic Caps

Protect sensitive electronics with caps that prevent static buildup and keep dust out of connections. They have a surface resistivity of less than 10¹² ohms/sq. for packaging and storing components such as semiconductors and resistors. Caps fit threaded and unthreaded electrical connectors.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	For Thread Size	Inside Ht.	Flexibility	Max. Temp., ° F	Max. Surface Resistivity, ohm/sq.	Color	Mil. Spec.	Pkg. Qty.		Pkg.
Polyethylene



	0.85"	7/8"-20	1/2"	Rigid	140	1× 10^12	Pink	MIL-PRF-81705	50	94075K36	000000

Screw-On Caps

Polyethylene

Thread onto male pipe and fittings for the most secure fit. These caps keep dust, paint, and coatings out of threads and pipe. They also protect from damage during manufacturing, shipping, and storage.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	Thread
	Size	Type	For OD	Inside Ht.	Flexibility	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Polyethylene







				For Straight-Thread Fittings

				7/8"-20	UNEF	7/8"	23/32"	Rigid	150	Red	100	1277K121	000000

Antistatic Plugs

Protect sensitive electronics with plugs that prevent static buildup and keep dust out of connections. They have a surface resistivity of less than 10¹² ohms/sq. for packaging and storing components such as semiconductors and resistors. Plugs fit threaded and unthreaded electrical connectors.

Polyethylene—Hard and wear resistant to hold up against scrapes and gouges.

	For Thread Size	Ht.	Head Dia.	Max. Surface Resistivity, ohm/sq.	Max. Temp., ° F	Color	Mil. Spec.	Pkg. Qty.		Pkg.
Polyethylene



	27/32"	7/8"-20	5/8"	1 1/16"	1× 10^12	140	Pink	MIL-PRF-81705	50	94075K74	000000

Conductive Caps

Shield electrical connectors from interference and static while keeping out dust. These caps have a surface resistivity of less than 10⁵ ohms/sq. to block stray signals and dissipate static charges much more quickly than antistatic caps. They protect threaded and unthreaded connectors during shipping and storage.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	For Thread Size	Inside Ht.	Flexibility	Max. Temp., ° F	Max. Surface Resistivity, ohm/sq.	Color	Mil. Spec.	Pkg. Qty.		Pkg.
Polyethylene



	0.852"	7/8"-20	1/2"	Rigid	140	1× 10^5	Black	MIL-PRF-81705	25	94075K16	000000

Conductive Plugs

Shield electrical connectors from interference and static while keeping out dust. These plugs have a surface resistivity of less than 10⁵ ohms/sq. to block stray signals from nearby equipment. They also dissipate static charges much more quickly than antistatic plugs. Use them to protect threaded and unthreaded connectors during shipping and storage.

Polyethylene—Hard and wear resistant to hold up against scrapes and gouges.

	For Thread Size	Ht.	Head Dia.	Max. Surface Resistivity, ohm/sq.	Max. Temp., ° F	Color	Mil. Spec.	Pkg. Qty.		Pkg.
Polyethylene



	27/32"	7/8"-20	5/8"	1 1/16"	1× 10^5	140	Black	MIL-PRF-81705	50	94075K54	000000