Hex Threaded Inserts | McMaster-Carr

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97 Products

18-8 Stainless Steel Twist-Resistant Hex-Shaped Inserts for Plastic

These 18-8 stainless steel inserts have good corrosion resistance and may be mildly magnetic. The hex-shaped body resists loosening and twisting in a round hole. Press into a drilled hole to install.

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

Inch

18-8 Stainless Steel
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.
2-56	0.23"	3/16"	3/16"	25	000000000	000000
4-40	15/64"	3/16"	3/16"	25	000000000	00000
6-32	15/64"	3/16"	3/16"	25	000000000	00000
8-32	17/64"	1/4"	1/4"	25	000000000	00000
10-24	0.265"	1/4"	1/4"	10	000000000	0000
10-32	17/64"	1/4"	1/4"	25	000000000	00000
1/4"-20	5/16"	5/16"	5/16"	10	000000000	0000
5/16"-18	0.365"	3/8"	3/8"	10	000000000	00000

Metric

18-8 Stainless Steel
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size, mm	For Max. Hole Dia., mm	Pkg. Qty.		Pkg.
M2.5	0.45	5.8	4.7	4.7	10	000000000	00000
M3	0.5	5.8	4.7	4.7	25	000000000	00000
M3.5	0.6	5.8	4.7	4.7	25	000000000	00000
M4	0.7	6.7	6.3	6.3	25	000000000	00000
M5	0.8	6.7	6.3	6.3	25	000000000	00000
M6	1	8	7.9	7.9	10	000000000	0000
M8	1.25	9.27	9.6	9.6	10	000000000	00000

Aluminum Twist-Resistant Hex-Shaped Inserts for Plastic

70% lighter than stainless steel, these aluminum inserts are mildly corrosion resistant and nonmagnetic. The hex-shaped body resists loosening and twisting in a round hole. Press into a drilled hole to install.

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

Inch

Aluminum
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.
2-56	15/64"	3/16"	3/16"	50	000000000	000000
4-40	15/64"	3/16"	3/16"	50	000000000	0000
6-32	15/64"	3/16"	3/16"	50	000000000	00000
8-32	17/64"	1/4"	1/4"	50	000000000	00000
10-24	0.265"	1/4"	1/4"	25	000000000	0000
10-32	17/64"	1/4"	1/4"	50	000000000	00000
1/4"-20	5/16"	5/16"	5/16"	25	000000000	00000

Metric

Aluminum
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.
M2.5	0.45	5.84	4.75 mm	4.75mm	25	000000000	00000
M3	0.5	5.84	3/16"	3/16"	25	000000000	0000
M3.5	0.6	5.84	4.75 mm	4.75mm	25	000000000	0000
M4	0.7	6.73	1/4"	1/4"	25	000000000	0000
M5	0.8	6.73	1/4"	1/4"	25	000000000	0000
M6	1	8	7.9 mm	7.9mm	25	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.

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"	0.03"	15/64"	15/64"	Hex	4 mm	25	000000000	0000	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"	0.04"	5/16"	5/16"	Hex	5 mm	50	000000000	0000	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	0000	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	5/8"	0.629"	0.492"	0.04"	23/64"	23/64"	Hex	6 mm	25	000000000	0000	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	0000	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	25/32"	0.756"	0.626"	0.03"	15/32"	15/32"	Hex	10 mm	25	000000000	00000	000000000	00000
3/8"-16	63/64"	0.944"	0.625"	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
M4	0.7	10	9.5	8	0.5	6 mm	6 mm	Hex	4 mm	100	000000000	00000	000000000	000000
M5	0.8	10	9.96	11.5	1.1	7.9 mm	7.9 mm	Hex	5 mm	50	000000000	0000	000000000	00000
M5	0.8	13	12.96	11.5	1.1	7.9 mm	7.9 mm	Hex	5 mm	25	000000000	0000	000000000	00000
M6	1	10	9.96	12.5	1.1	9.1 mm	9.1 mm	Hex	6 mm	25	000000000	0000	000000000	00000
M6	1	13	12.365	12	0.635	9 mm	9 mm	Hex	6 mm	50	000000000	0000	000000000	00000
M6	1	16	15.96	12.5	1.1	9.1 mm	9.1 mm	Hex	6 mm	25	000000000	0000	000000000	00000
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
M8	1.25	25	24.95	14.5	1.2	11 mm	11 mm	Hex	8 mm	10	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.

Inch

Inserts
				Drive					Installation Bits
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Style	Size, mm	Pkg. Qty.		Pkg.		Each
Zinc Alloy
6-32	3/8"	7/32"	7/32"	Hex	3	50	000000000	00000	000000	00
8-32	25/64"	15/64"	15/64"	Hex	4	100	000000000	00000	000000000	000000
10-24	25/64"	9/32"	9/32"	Hex	5	100	000000000	00000	000000000	00000
10-24	33/64"	9/32"	9/32"	Hex	5	50	000000000	0000	000000000	00000
10-32	25/64"	9/32"	9/32"	Hex	5	100	000000000	00000	000000000	00000
10-32	33/64"	9/32"	9/32"	Hex	5	50	000000000	0000	000000000	00000
1/4"-20	25/64"	23/64"	23/64"	Hex	6	100	000000000	00000	000000000	00000
1/4"-20	33/64"	23/64"	23/64"	Hex	6	100	000000000	00000	000000000	00000
1/4"-20	25/32"	23/64"	23/64"	Hex	6	50	000000000	00000	000000000	00000
5/16"-18	1/2"	7/16"	7/16"	Hex	8	50	000000000	00000	000000000	00000
5/16"-18	25/32"	7/16"	7/16"	Hex	8	50	000000000	00000	000000000	00000
5/16"-18	63/64"	7/16"	7/16"	Hex	8	25	000000000	00000	000000000	00000

Metric

Inserts
					Drive					Installation Bits
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size, mm	For Max. Hole Dia., mm	Style	Size, mm	Pkg. Qty.		Pkg.		Each
Zinc Alloy
M4	0.7	10	6	6	Hex	4	100	000000000	000000	000000000	000000
M6	1	13	9	9	Hex	6	50	000000000	0000	000000000	00000
M6	1	20	9	9	Hex	6	50	000000000	0000	000000000	00000
M8	1.25	13	11	11	Hex	8	25	000000000	0000	000000000	00000
M8	1.25	20	11	11	Hex	8	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.

Standard Zinc Alloy Assortments

				Drive
Includes	No. of Inserts Included	Drill Bit Size	For Max. Hole Dia.	Style	Size		Each
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

Flanged Zinc Alloy Assortments

							Drive
Includes	No. of Inserts Included	Body Lg.	Flange Thick.	Flange Dia.	Drill Bit Size	For Max. Hole Dia.	Style	Size		Each
8-32 Thread × 0.394" Installed Lg. (10 Each) 10-24 Thread × 0.394" Installed Lg. (10 Each) 1/4"-20 Thread × 0.512" Installed Lg. (10 Each) 5/16"-18 Thread × 0.512" Installed Lg. (10 Each) 3/8"-16 Thread × 0.984" Installed Lg. (8 Each)	48	0.37", 0.374", 0.481", 0.488", 0.953"	0.02", 0.024", 0.031"	0.329", 0.433", 0.469", 0.567", 0.626"	15/64", 9/32", 23/64", 7/16", 15/32"	15/64", 9/32", 23/64", 7/16", 15/32"	Hex	4 mm, 5 mm, 6 mm, 8 mm, 10 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	6	1/4"	000000000	00000
5/16"-18	8	3/8"	000000000	00000
3/8"-16	10	3/8"	000000000	00000

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"	15/32"	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