Self-Tapping Inserts | McMaster-Carr

	System of Measurement System of Measurement

Metric

Inch

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Thread Type Thread Type

UNC

UNF

Metric

	For Use In For Use In

	Material Material

	Installed Length Installed Length

	For Minimum Material Thickness For Minimum Material Thickness

	Drill Bit Size Drill Bit Size

	For Maximum Hole Diameter For Maximum Hole Diameter

	Thread Spacing Thread Spacing

Coarse

Fine

	Thread Fit Thread Fit

Class 2B

Class 6H

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Tensile Strength Tensile Strength

40,000 psi

60,000 psi

Not Rated

	Drive Style Drive Style


Slotted	Hex

	Drive Size Drive Size

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

DFARS Specialty Metals
COTS-Exempt

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

REACH Compliant

	Body Length Body Length

	Flange Diameter Flange Diameter

	Flange Thickness Flange Thickness

	Number of Inserts Included Number of Inserts Included

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163 Products

Tapping Inserts for Plastic

Also known as Trisert inserts, these cut threads into plastic and have better holding power than press-fit inserts. Flutes channel loose chips up and out to keep threads clean during installation. Made from brass, they’re corrosion resistant, electrically conductive, and nonmagnetic. Install in a drilled hole using a required installation tool.

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

Inch

Inserts							Installation Tools
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.		Each
Brass
2-56	0.141"	1/8"	1/8"	10	000000000	00000	000000000	0000000
2-56	3/16"	No. 30	0.1285"	10	000000000	00000	000000000	000000
4-40	0.172"	5/32"	5/32"	10	000000000	00000	000000000	000000
4-40	15/64"	No. 24	0.152"	10	000000000	00000	000000000	000000
6-32	0.218"	3/16"	3/16"	10	000000000	0000	000000000	000000
6-32	9/32"	No. 9	0.196"	10	000000000	00000	000000000	000000
8-32	1/4"	No. 1	0.228"	10	000000000	0000	000000000	000000
8-32	0.344"	No. 1	0.228"	10	000000000	00000	000000000	000000
10-24	0.296"	17/64"	17/64"	10	000000000	00000	000000000	000000
10-24	3/8"	H	0.266"	10	000000000	00000	000000000	000000
10-32	0.296"	17/64"	17/64"	10	000000000	00000	000000000	000000
10-32	3/8"	H	0.266"	10	000000000	00000	000000000	000000
1/4"-20	3/8"	11/32"	11/32"	10	000000000	00000	000000000	000000
1/4"-20	31/64"	R	0.339"	10	000000000	00000	000000000	000000

Metric

Inserts								Installation Tools
Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.		Each
Brass
M2	0.4	3.58mm	1/8"	1/8"	10	000000000	00000	000000000	0000000
M2	0.4	4.78mm	1/8"	1/8"	10	000000000	0000	000000000	000000
M3	0.5	4.37mm	5/32"	5/32"	10	000000000	0000	000000000	000000
M3	0.5	5.25mm	4.1 mm	4.1mm	5	000000000	0000	000000000	000000
M3	0.5	5.94mm	5/32"	5/32"	10	000000000	00000	000000000	000000
M4	0.7	6.35mm	7/32"	7/32"	10	000000000	00000	000000000	000000
M4	0.7	8.33mm	7/32"	7/32"	10	000000000	00000	000000000	000000
M5	0.8	6.4mm	6.9 mm	6.9mm	5	000000000	0000	000000000	000000
M5	0.8	7.52mm	17/64"	17/64"	10	000000000	00000	000000000	000000
M5	0.8	8.4mm	6.9 mm	6.9mm	5	000000000	0000	000000000	000000
M5	0.8	9.53mm	17/64"	17/64"	10	000000000	00000	000000000	000000
M6	1	7.9mm	8 mm	8mm	1	000000000	0000	000000000	000000
M6	1	9.53mm	11/32"	11/32"	10	000000000	00000	000000000	000000
M6	1	12.29mm	11/32"	11/32"	10	000000000	00000	000000000	000000
M8	1.25	9.5mm	10.1 mm	10.1mm	1	000000000	0000	000000000	000000
M8	1.25	12.4mm	10.1 mm	10.1mm	1	000000000	0000	000000000	000000
M10	1.5	12mm	13 mm	13mm	1	000000000	0000	000000000	000000
M10	1.5	16mm	13 mm	13mm	1	000000000	0000	000000000	000000

Tapping Inserts for Soft Metal

Also known as Tap-Lok inserts, these inserts cut their own threads in soft metals such as aluminum, so there’s no need to tap the hole. Install them into a drilled hole with an installation tool and a ratchet wrench. Installation tools can also be placed in the chuck on a drill press and turned by hand.

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

Inch

Inserts						Installation Tools
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.		Each		Each
Zinc-Plated Steel
4-40	15/64"	No. 21	0.159"	000000000	000000	000000000	0000000
6-32	9/32"	13/64"	13/64"	000000000	00000	000000000	000000
8-32	21/64"	15/64"	15/64"	000000000	00000	000000000	000000
10-24	3/8"	J	0.277"	000000000	00000	000000000	000000
10-32	3/8"	9/32"	9/32"	000000000	0000	000000000	000000
1/4"-20	31/64"	11/32"	11/32"	000000000	0000	000000000	000000
5/16"-18	9/16"	7/16"	7/16"	000000000	0000	000000000	000000
3/8"-16	11/16"	17/32"	17/32"	000000000	0000	000000000	000000
1/2"-13	29/32"	11/16"	11/16"	000000000	0000	000000000	000000
5/8"-11	1 1/8"	55/64"	55/64"	000000000	00000	000000000	000000

Metric

Inserts							Installation Tools
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.		Each		Each
Zinc-Plated Steel
M3	0.5	6	No. 21	0.159"	000000000	000000	000000000	0000000
M3.5	0.6	7.1	13/64"	13/64"	000000000	00000	000000000	000000
M4	0.7	8.2	15/64"	15/64"	000000000	00000	000000000	000000
M5	0.8	9.5	J	0.277"	000000000	00000	000000000	000000
M6	1	12.3	S	0.348"	000000000	00000	000000000	000000
M8	1.25	14.2	7/16"	7/16"	000000000	00000	000000000	000000
M10	1.5	17.4	17/32"	17/32"	000000000	00000	000000000	000000

Stainless Steel Tapping Inserts for Hardwood

These 18-8 stainless steel inserts have good corrosion resistance and may be mildly magnetic. Also known as knife-thread inserts, they have sharp threads that cut into hardwood for a secure hold. Install using an installation bit and drill.

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

Inch

Inserts							Installation Bits
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.		Each
18-8 Stainless Steel
4-40	3/8"	17/64"	17/64"	1	000000000	00000	000000000	00000
6-32	3/8"	17/64"	17/64"	1	000000000	0000	000000000	0000
8-32	3/8"	17/64"	17/64"	1	000000000	0000	000000000	0000
10-24	1/2"	25/64"	25/64"	1	000000000	0000	000000000	0000
10-32	1/2"	25/64"	25/64"	1	000000000	0000	000000000	0000
1/4"-20	1/2"	25/64"	25/64"	1	000000000	0000	000000000	0000
1/4"-28	1/2"	25/64"	25/64"	1	000000000	0000	000000000	0000
5/16"-18	5/8"	33/64"	33/64"	1	000000000	0000	000000000	0000
5/16"-24	5/8"	33/64"	33/64"	1	000000000	0000	000000000	0000
3/8"-16	5/8"	33/64"	33/64"	1	000000000	0000	000000000	0000
3/8"-24	5/8"	33/64"	33/64"	1	000000000	0000	000000000	0000

Metric

Inserts								Installation Bits
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.		Each
18-8 Stainless Steel
M3	0.5	9.52	17/64"	17/64"	1	000000000	00000	000000000	00000
M4	0.7	9.52	17/64"	17/64"	1	000000000	0000	000000000	0000
M5	0.8	12.7	25/64"	25/64"	1	000000000	0000	000000000	0000
M6	1	12.7	25/64"	25/64"	1	000000000	0000	000000000	0000
M8	1.25	15.9	33/64"	33/64"	1	000000000	0000	000000000	0000
M10	1.5	15.9	33/64"	33/64"	1	000000000	0000	000000000	0000

Brass Tapping Inserts for Hardwood

Made from brass, these inserts are nonmagnetic, mildly corrosion resistant, and electrically conductive. Also known as knife-thread inserts, they have sharp threads that cut into hardwood for a secure hold. Install using an installation bit and drill.

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

Inch

Inserts								Installation Bits
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Drive Style	Pkg. Qty.		Pkg.		Each
Brass
4-40	3/8"	17/64"	0.266"	Slotted	25	000000000	000000	000000000	00000
6-32	3/8"	17/64"	0.266"	Slotted	25	000000000	00000	000000000	0000
8-32	3/8"	17/64"	0.266"	Slotted	25	000000000	00000	000000000	0000
10-24	1/2"	25/64"	0.391"	Slotted	25	000000000	00000	000000000	0000
10-32	1/2"	25/64"	0.391"	Slotted	25	000000000	00000	000000000	0000
1/4"-20	1/2"	25/64"	0.391"	Slotted	25	000000000	00000	000000000	0000
1/4"-28	1/2"	25/64"	0.391"	Slotted	25	000000000	00000	000000000	0000
5/16"-18	5/8"	33/64"	0.513"	Slotted	10	000000000	0000	000000000	0000
5/16"-24	5/8"	33/64"	0.513"	Slotted	10	000000000	0000	000000000	0000
3/8"-16	5/8"	33/64"	0.513"	Slotted	10	000000000	0000	000000000	0000
3/8"-24	5/8"	33/64"	0.513"	Slotted	10	000000000	00000	000000000	0000

Metric

Inserts									Installation Bits
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Drive Style	Pkg. Qty.		Pkg.		Each
Brass
M3	0.5	9.53	17/64"	0.266"	Slotted	10	000000000	00000	000000000	00000
M4	0.7	9.53	17/64"	0.266"	Slotted	10	000000000	0000	000000000	0000
M5	0.8	12.7	25/64"	0.391"	Slotted	10	000000000	0000	000000000	0000
M6	1	12.7	25/64"	0.391"	Slotted	10	000000000	0000	000000000	0000
M8	1.25	15.88	33/64"	0.513"	Slotted	10	000000000	0000	000000000	0000

Steel Tapping Inserts for Hardwood

Steel inserts have high strength for durability. Also known as knife-thread inserts, they have sharp threads that cut into hardwood for a secure hold. Install using a hex driver or an installation bit and drill for faster installation.

Zinc-plated steel inserts are mildly corrosion resistant.

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

Inserts
				Drive					Installation Bits
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Style	Size	Pkg. Qty.		Pkg.		Each
Zinc-Plated Steel
8-32	0.394"	17/64"	1/4"	Hex	4 mm	25	000000000	000000	000000000	000000
10-24	0.472"	5/16"	19/64"	Hex	5 mm	25	000000000	00000	000000000	00000
1/4"-20	0.394"	3/8"	3/8"	Hex	6 mm	25	000000000	00000	000000000	00000
1/4"-20	0.472"	3/8"	3/8"	Hex	6 mm	10	000000000	00000	000000000	00000
1/4"-20	0.591"	3/8"	3/8"	Hex	6 mm	10	000000000	00000	000000000	00000
1/4"-20	0.709"	3/8"	3/8"	Hex	6 mm	10	000000000	00000	000000000	00000
1/4"-20	0.787"	3/8"	3/8"	Hex	6 mm	10	000000000	00000	000000000	00000
1/4"-20	1.181"	3/8"	3/8"	Hex	6 mm	10	000000000	00000	000000000	00000
5/16"-18	0.591"	29/32"	29/64"	Hex	8 mm	10	000000000	00000	000000000	00000
5/16"-18	0.709"	15/32"	29/64"	Hex	8 mm	10	000000000	00000	000000000	00000
5/16"-18	1.181"	15/32"	15/32"	Hex	8 mm	10	000000000	00000	000000000	00000
3/8"-16	0.591"	5/8"	5/8"	Hex	10 mm	10	000000000	00000	000000000	00000
3/8"-16	0.787"	5/8"	5/8"	Hex	10 mm	10	000000000	00000	000000000	00000
3/8"-16	1.181"	5/8"	39/64"	Hex	10 mm	10	000000000	00000	000000000	00000

Brass Tapping Insert Assortments for Hardwood

Assortments include various sizes of tapping inserts for hardwood. Made from brass, they’re nonmagnetic, mildly corrosion resistant, and electrically conductive. Also known as knife-thread inserts, they have sharp threads that cut into hardwood for a secure hold. Install using an installation bit and drill.

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

Brass Assortments
Includes	No. of Inserts Included	Drill Bit Size	For Max. Hole Dia.	Drive Style		Each
6-32 Thread × 3/8" Installed Lg. (10 Each) 8-32 Thread × 3/8" Installed Lg. (10 Each) 10-32 Thread × 33/64" Installed Lg. (10 Each) 1/4"-20 Thread × 1/2" Installed Lg. (10 Each) 5/16"-18 Thread × 5/8" Installed Lg. (10 Each) 3/8"-16 Thread × 5/8" Installed Lg. (10 Each)	60	1/4", 3/8", 1/2"	1/4", 3/8", 1/2"	Slotted	000000000	000000

Installation Bits

For fast installation, use these installation bits with power drills and drill presses.

For Thread Size	Hex Shank Size		Each
6-32, 8-32	1/4"	000000000	00000
8-32, 10-24, 10-32, M4	1/4"	000000000	0000
10-24, 10-32, 1/4"-20, 1/4"-28, M5	1/4"	000000000	0000
1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, M6	1/4"	000000000	0000
5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, M8	1/4"	000000000	0000
3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, M10	3/8"	000000000	0000

Flanged Tapping Inserts for Softwood

The flange keeps these inserts from being pulled through a hole and provides a load-bearing surface. They have large threads that cut into softwood for a strong hold. Made of zinc alloy, they have mild corrosion resistance. Install using a hex driver or an installation bit and drill for faster installation. Installed length includes the flange.

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

Inch

Inserts
			Flange				Drive					Installation Bits
Thread Size	Installed Lg.	Body Lg.	Dia.	Thick.	Drill Bit Size	For Max. Hole Dia.	Style	Size	Pkg. Qty.		Pkg.		Each
Zinc Alloy
8-32	25/64"	0.361"	0.335"	0.025"	15/64"	15/64"	Hex	4 mm	100	000000000	000000	000000000	000000
8-32	25/32"	0.756"	0.335"	0.031"	15/64"	15/64"	Hex	4 mm	25	000000000	00000	000000000	00000
10-24	25/64"	0.361"	0.453"	0.03"	9/32"	9/32"	Hex	5 mm	50	000000000	0000	000000000	00000
10-24	33/64"	0.395"	0.453"	0.039"	5/16"	5/16"	Hex	5 mm	50	000000000	00000	000000000	00000
10-24	25/32"	0.751"	0.453"	0.03"	9/32"	9/32"	Hex	5 mm	50	000000000	00000	000000000	00000
10-32	25/64"	0.361"	0.453"	0.03"	9/32"	9/32"	Hex	5 mm	50	000000000	0000	000000000	00000
10-32	33/64"	0.486"	0.453"	0.03"	9/32"	9/32"	Hex	5 mm	50	000000000	0000	000000000	00000
10-32	25/32"	0.751"	0.453"	0.03"	9/32"	9/32"	Hex	5 mm	25	000000000	0000	000000000	00000
1/4"-20	25/64"	0.354"	0.492"	0.04"	23/64"	23/64"	Hex	6 mm	50	000000000	00000	000000000	00000
1/4"-20	33/64"	0.486"	0.492"	0.03"	23/64"	23/64"	Hex	6 mm	100	000000000	00000	000000000	00000
1/4"-20	25/32"	0.741"	0.492"	0.04"	23/64"	23/64"	Hex	6 mm	50	000000000	00000	000000000	00000
1/4"-20	63/64"	0.944"	0.492"	0.04"	23/64"	23/64"	Hex	6 mm	50	000000000	00000	000000000	00000
5/16"-18	33/64"	0.486"	0.571"	0.03"	7/16"	7/16"	Hex	8 mm	50	000000000	00000	000000000	00000
5/16"-18	25/32"	0.73"	0.571"	0.057"	7/16"	7/16"	Hex	8 mm	25	000000000	00000	000000000	00000
5/16"-18	63/64"	0.954"	0.571"	0.03"	7/16"	7/16"	Hex	8 mm	25	000000000	00000	000000000	00000
3/8"-16	33/64"	0.486"	0.63"	0.03"	15/32"	15/32"	Hex	10 mm	25	000000000	00000	000000000	00000
3/8"-16	63/64"	0.944"	5/8"	0.04"	15/32"	15/32"	Hex	10 mm	25	000000000	00000	000000000	00000

Metric

Inserts
				Flange, mm				Drive					Installation Bits
Thread Size	Thread Pitch, mm	Installed Lg., mm	Body Lg., mm	Dia.	Thick.	Drill Bit Size	For Max. Hole Dia.	Style	Size	Pkg. Qty.		Pkg.		Each
Zinc Alloy
M6	1	13	12.365	12	0.635	9 mm	9 mm	Hex	6 mm	50	000000000	00000	000000000	000000
M6	1	20	19.24	12	0.762	9 mm	9 mm	Hex	6 mm	50	000000000	0000	000000000	00000
M8	1.25	13	11.98	15	1.016	11 mm	11 mm	Hex	8 mm	25	000000000	0000	000000000	00000
M8	1.25	20	18.98	15	1.016	11 mm	11 mm	Hex	8 mm	25	000000000	0000	000000000	00000
M10	1.5	13	12.2	16	0.8	12 mm	12 mm	Hex	10 mm	25	000000000	0000	000000000	00000
M10	1.5	25	24	16	0.8	12 mm	12 mm	Hex	10 mm	25	000000000	00000	000000000	00000

Tapping Inserts for Softwood

Large threads cut into softwood for a strong hold. Made of zinc alloy, they are mildly corrosion resistant. Install using a hex driver or an installation bit and drill for faster installation.

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

Inch

Inserts
				Drive					Installation Bits
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Style	Size	Pkg. Qty.		Pkg.		Each
Zinc Alloy
8-32	25/64"	15/64"	15/64"	Hex	4 mm	100	000000000	000000	000000000	000000
10-24	33/64"	9/32"	9/32"	Hex	5 mm	50	000000000	0000	000000000	00000
10-32	33/64"	9/32"	9/32"	Hex	5 mm	50	000000000	0000	000000000	00000
1/4"-20	33/64"	23/64"	23/64"	Hex	6 mm	100	000000000	00000	000000000	00000
1/4"-20	25/32"	23/64"	23/64"	Hex	6 mm	50	000000000	00000	000000000	00000
5/16"-18	25/32"	7/16"	7/16"	Hex	8 mm	50	000000000	00000	000000000	00000
5/16"-18	63/64"	7/16"	7/16"	Hex	8 mm	25	000000000	00000	000000000	00000

Metric

Inserts
					Drive					Installation Bits
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Style	Size	Pkg. Qty.		Pkg.		Each
Zinc Alloy
M6	1	13	9 mm	9 mm	Hex	6 mm	50	000000000	00000	000000000	000000
M6	1	20	9 mm	9 mm	Hex	6 mm	50	000000000	0000	000000000	00000
M8	1.25	13	11 mm	11 mm	Hex	8 mm	25	000000000	0000	000000000	00000
M8	1.25	20	11 mm	11 mm	Hex	8 mm	25	000000000	0000	000000000	00000

Tapping Insert Assortments for Softwood

Assortments include various sizes of tapping inserts for softwood. They have large threads that cut into softwood for a strong hold. Made of zinc alloy, they are mildly corrosion resistant. Install using a hex driver or an installation bit and drill for faster installation.

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

				Drive
Includes	No. of Inserts Included	Drill Bit Size	For Max. Hole Dia.	Style	Size		Each
Zinc Alloy Assortments
8-32 Thread × 0.391" Installed Lg. (10 Each) 10-24 Thread × 0.516" Installed Lg. (10 Each) 10-32 Thread × 0.516" Installed Lg. (10 Each) 1/4"-20 Thread × 0.516" Installed Lg. (10 Each) 5/16"-18 Thread × 0.781" Installed Lg. (10 Each)	50	15/64", 9/32", 23/64", 7/16"	15/64", 9/32", 23/64", 7/16"	Hex	4 mm, 5 mm, 6 mm, 8 mm	000000000	000000

Installation Bits

Faster than using a hex driver, these installation bits are used with power drills and drill presses.

For Thread Size	For Drive Size, mm	Hex Shank Size		Each
8-32	4	1/4"	000000000	000000
10-24, 10-32	5	1/4"	000000000	00000
1/4"-20, M6	6	1/4"	000000000	00000
5/16"-18, M8	8	3/8"	000000000	00000