M8 Tee Nuts | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Thread Pitch Thread Pitch

1.25 mm

	Material Material

Steel

Stainless Steel

	Finish Finish

Zinc Plated

Black Oxide

	For Slot Width For Slot Width

	Base Width Base Width

	Base Height Base Height

	Threading Threading

Fully Threaded

Partially Threaded

	Overall Height Overall Height

	Nut Style Nut Style


Single	Hammer

Self-Aligning	Double

	Rail Height Rail Height

	Rail Profile Rail Profile

	Double
	Quad
	Single

	For Use In For Use In

Hardwood

Softwood

	Installed Length Installed Length

10 mm to 11.99 mm

12 mm or greater

	Weld Nut Shape Weld Nut Shape

	Rectangular
	Round
	Square
	Rectangular with Floating Nut
	Hex

	Nut Type Nut Type


Flange	Weld

Adhesive Mount	Square

Hex

	Thread Fit Thread Fit

Class 2B

Class 6G

Class 6H

	Barrel Profile Barrel Profile

	Low
	Standard

	Barrel Length Barrel Length

9.5mm

11mm

15mm

	Barrel Diameter Barrel Diameter

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Thread Type Thread Type

Metric

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39 Products

About Nuts, Materials, and Finishes

Zinc-Plated Steel

These inserts have four prongs on the flange to resist twisting in hardwood and softwood. Hammer them into a drilled hole to install. Installed length includes the flange.

Zinc-plated steel inserts are mildly corrosion resistant in wet environments.

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

Metric

			Barrel, mm		Flange, mm
Thread Size	Thread Pitch, mm	Installed Lg., mm	Dia.	Lg.	Dia.	Thick.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M8	1.25	12.75	10	11	22	1.75	9.5 mm	9.5 mm	50	000000000	000000
M8	1.25	16.75	10	15	22	1.75	9.5 mm	9.5 mm	50	000000000	00000

18-8 Stainless Steel Tee Nut Inserts for Wood

These 18-8 stainless steel tee nut inserts have better corrosion resistance than zinc-plated steel inserts. They have four prongs on the flange to resist twisting in hardwood and softwood. Hammer them into a drilled hole to install. Installed length includes the flange.

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

Metric

			Barrel, mm		Flange, mm
Thread Size	Thread Pitch, mm	Installed Lg., mm	Dia.	Lg.	Dia.	Thick.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M8	1.25	11	10	9.5	22.2	1.5	13/32"	13/32"	5	000000000	000000

316 Stainless Steel Tee Nut Inserts for Wood

The most corrosion resistant tee nut inserts we offer, these inserts stand up to chemicals and salt water. They have four prongs on the flange to resist twisting in hardwood and softwood. Hammer them into a drilled hole to install. Installed length includes the flange.

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

Metric

			Barrel, mm		Flange, mm
Thread Size	Thread Pitch, mm	Installed Lg., mm	Dia.	Lg.	Dia.	Thick.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.
316 Stainless Steel
M8	1.25	11	10	9.5	22.2	1.5	13/32"	13/32"	5	000000000	00000

Low-Profile Narrow-Base Weld Nuts

Use these weld nuts in low-clearance applications and in tight spaces where round-base weld nuts won't fit. Weld them to flat and uneven uncoated steel surfaces for a strong permanent hold.

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

Metric

Thread		Base			Barrel
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Dia., mm	Ht., mm	For Hole Dia., mm	Pkg. Qty.		Pkg.
Steel
M8	1.25	38	16	3.6	9.2	2	9.6	10	000000000	000000

Low-Profile Narrow-Base Weld Nuts with Projections

Projections concentrate the weld and provide room for heat to dissipate. Weld them to flat stainless steel surfaces for a strong permanent hold. They can be used in channels and tight spaces where round-base weld nuts won't fit.

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

Metric

Thread		Base			Barrel
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Dia., mm	Ht., mm	For Hole Dia., mm	No. of Projections	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M8	1.25	25	16	3.6	9.2	2	9.2	2	5	000000000	00000

Metric Steel Narrow-Base Weld Nuts

A long barrel provides secure thread engagement. Weld these nuts to flat, uncoated steel surfaces for a strong, permanent hold. They can be used in channels and tight spaces where round-base weld nuts won't fit.

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

Thread		Base			Barrel
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Dia., mm	Ht., mm	Pkg. Qty.		Pkg.
Steel
M8	1.25	22.2	14.3	1.4	9.5	9.5	25	000000000	00000
M8	1.25	22.2	14.3	1.4	9.5	15.9	25	000000000	00000

Stainless Steel Narrow-Base Weld Nuts

Weld these nuts on flat stainless steel surfaces for a strong permanent hold. They have a long barrel for secure thread engagement. Use them in channels and tight spaces where round-base weld nuts won't fit.

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

Metric

Thread		Base			Barrel
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Dia., mm	Ht., mm	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M8	1.25	22	14.3	1.5	9.9	9.5	10	000000000	000000

Steel Offset-Barrel Narrow-Base Weld Nuts

An offset barrel allows you to position threads near corners. Weld them to flat uncoated steel surfaces for a strong permanent hold. They can be used in channels and tight spaces where round-base weld nuts won't fit.

Zinc-plated steel weld nuts resist corrosion in wet environments.

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

Metric

Thread		Base			Barrel
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Dia., mm	Ht., mm	For Hole Dia., mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M8	1.25	25	16	3.6	9.2	2	9.3	10	000000000	00000
Steel
M8	1.25	25	16	3.6	9.2	2	9.3	10	000000000	0000

Metric Steel Round-Base Weld Nuts

These weld nuts have a smooth base that provides more contact with the mating surface than weld nuts with projections. The base also acts as a flange to distribute the load. A long barrel ensures secure thread engagement.

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

Thread		Base		Barrel
Size	Pitch, mm	Dia., mm	Thick., mm	Dia., mm	Ht., mm	Pkg. Qty.		Pkg.
Steel
M8	1.25	22.2	1.4	9.4	9.5	50	000000000	000000
M8	1.25	22.2	1.4	9.4	15.9	50	000000000	00000

Square Weld Nuts

Square weld nuts have more weld points than hex weld nuts for a stronger hold. Weld them on flat uncoated steel surfaces. All have a collar pilot that assists alignment and prevents welding spatter from getting into threads.

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

Metric

Thread
Size	Pitch, mm	Wd., mm	Ht., mm	For Hole Dia., mm	Specifications Met	Pkg. Qty.		Pkg.
Steel
M8	1.25	14	5.5	12.8	DIN 928	100	000000000	000000

Metric Steel Hex Weld Nuts

You can weld these nuts to flat and uneven uncoated steel surfaces for a strong permanent hold. A collar pilot assists alignment and prevents welding spatter from getting into threads.

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

Thread				Collar
Size	Pitch, mm	Wd., mm	Ht., mm	Dia., mm	Ht., mm	For Hole Dia., mm	Specifications Met	Pkg. Qty.		Pkg.
Steel
M8	1.25	14	5.6	10.5	0.9	10.5	DIN 929	50	000000000	000000

Metric Stainless Steel Hex Weld Nuts

You can weld these nuts to flat and uneven uncoated stainless steel surfaces for a strong permanent hold. They have a collar pilot that assists alignment and prevents welding spatter from getting into threads.

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

Thread				Collar
Size	Pitch, mm	Wd., mm	Ht., mm	Dia., mm	Ht., mm	For Hole Dia., mm	Specifications Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M8	1.25	14	5.6	10.5	0.9	10.5	DIN 929	25	000000000	000000

Metric Aligning Weld Nuts

Threads float inside the retainer so you can install a bolt at a slight angle to align with off-center parts. Weld these nuts to uncoated steel for a strong permanent hold or punch holes in the flanges and secure them with rivets. The retainer is made from C1008-C1010 steel.

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

Thread		Base
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Ht., mm	Pkg. Qty.		Pkg.
Steel Nut with C1008/C1010 Steel Retainer
M8	1.25	50.8	19.8	1.27	13.7	5	000000000	000000

Stainless Steel Adhesive-Mount Nuts

These nuts have excellent resistance to chemicals and salt water. Large holes in the base to allow adhesive to flow through. They’re often molded into plastics and used to add threads to plastic that is too thin to fit a threaded insert.

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

Metric

Thread		Base		Nut
Size	Pitch, mm	Dia., mm	Thick., mm	Wd., mm	Ht., mm	Hole Dia., mm	Pkg. Qty.		Pkg.
316 Stainless Steel
M8	1.25	23	1.2	13.38	5.5	5	5	000000000	00000
M8	1.25	38	1.2	13.83	5.5	4, 5	5	000000000	0000

Steel Adhesive-Mount Nuts

Large holes in the base allow adhesive to flow through. These nuts are often molded into plastics and used to add threads to plastic that is too thin to fit a threaded insert. A zinc plating provides corrosion resistance in wet environments.

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

Metric

Thread		Base		Nut
Size	Pitch, mm	Dia., mm	Thick., mm	Wd., mm	Ht., mm	Hole Dia., mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M8	1.25	23	1.2	14	6.8	5	10	000000000	00000
M8	1.25	38	1.2	14	6.8	4, 5	10	000000000	0000

T-Slot Nuts

Designed to slide into T-slot tracks on machine tool tables, use these nuts to secure clamps and workpieces.

Fully threaded nuts allow a stud to extend beyond the bottom of the nut. Partially threaded nuts keep studs from traveling past the bottom of the nut and damaging your table.

Stainless steel nuts have excellent corrosion resistance. They are a good choice for use with stainless steel parts or in EDM applications.

Metric

			Base				Fully Threaded		Partially Threaded
Thread Size	Thread Pitch, mm	For Slot Wd., mm	Ht., mm	Wd., mm	O'all Ht., mm	Specifications Met		Each		Each
Black-Oxide Steel
M8	1.25	10	6	16	11	__	000000000	00000	000000000	00000
M8	1.25	12	7	18	14	DIN 508	000000000	0000	000000	00
M8	1.25	14	8	22	16	DIN 508	000000000	0000	000000	00
M8	1.25	16	9	25	18	DIN 508	000000000	0000	000000	00
M8	1.25	18	10	28	20	DIN 508	000000000	00000	000000	00
18-8 Stainless Steel
M8	1.25	10	6	15	12	DIN 508	000000000	0000	000000	00

Drop-In T-Slot Nuts

Install these nuts from the top of the T-slot track and secure with a quarter turn to anchor clamps and workpieces. Also known as quarter-turn T-slot nuts.

Fully threaded nuts allow a stud to extend beyond the bottom of the nut.

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

Metric

Thread			Base			Fully Threaded
Size	Pitch, mm	For Slot Wd., mm	Ht., mm	Wd., mm	O'all Ht., mm		Each
Black-Oxide Steel
M8	1.25	10	6	15	12	000000000	00000

Secure-Hold T-Slot Nuts

After sliding the nut into a T-slot track, tighten the set screw to keep it in place. Use these nuts to secure clamps and workpieces in a machine table. They’re fully threaded to allow a stud to extend beyond the bottom of the nut.

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

Metric

Thread			Base			Drive			Fully Threaded
Size	Pitch, mm	For Slot Wd., mm	Ht., mm	Wd., mm	O'all Ht., mm	Size, mm	Style	Includes		Each
Black-Oxide Steel
M8	1.25	12	6.4	15.9	15.9	4	Hex	Set Screw	000000000	000000

T-Slot Nut and Setup Stud Kits

For mounting items to your machine table, these kits contain the full system of necessary components. Choose the kit with slot width matching that of your table.

Each kit includes T-slot nuts, setup studs, flange nuts, coupling nuts, and a T-slot cleaning tool.

			T-Slot Nut				Setup Stud
For Slot Wd.	No. of Pieces	Includes	Threading	Base Ht.	Base Wd.	Overall Ht.	Threading	Min.Tensile Strength, psi	Material		Each
M8 Thread Size × 1.25mm Thread Pitch
10mm	37	4 T-Slot Nuts 4 Setup Studs each in 80 mm, 110 mm, 140 mm, 150 mm, 175 mm, and 200 mm Lengths 4 Flange Nuts 4 Coupling Nuts 1 T-Slot Cleaner	Partially Threaded	6mm	16mm	11mm	Threaded on Both Ends	125,000	Black-Oxide Steel	0000000	0000000

Setup Clamp and T-Slot Fastener Kits

Wood Stand and Steel Tray

Get everything needed for basic workholding on a machine table. Select a kit that matches your table's slot width. Each kit includes studs, setup clamps, step blocks, T-slot nuts, flange nuts, coupling nuts, and a T-slot cleaning tool.

			Step Block
For Slot Wd., mm	No. of Pieces	Includes	Ht. Range, mm	Wd., mm	T-Slot Nut Base Wd., mm	Material	Container Type		Each
M8 × 1.25 mm Thread Size
10	47	24 Studs (4 each in 80 mm, 110 mm, 125 mm, 150 mm, 175 mm, and 200 mm lengths) 6 Step Setup Clamps (2 each in 64 mm, 102 mm, and 152 mm lengths) 3 Step Block Pairs 4 T-Slot Nuts 6 Flange Nuts 4 Coupling Nuts T-Slot Cleaner	19-152	25	16	Steel	Wood Stand and Steel Tray	0000000	0000000

T-Slotted Framing Fasteners

Screw and nut sets or nuts secure brackets and other accessories to rails.

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

End-Feed Fasteners

Single Nut

Double Nut

Self-Aligning Nut

End-feed fasteners slide into the end of the rail to attach components.

Use double and triple fasteners to install brackets with multiple holes. They eliminate the need for a single nut and screw for each hole.

Self-aligning fasteners have a ridge that keeps them centered in the T-slot.

For Rail Ht.					Mounting
Single	Double and Quad	Color	Material	Thread Size	Hole Location	Pkg. Qty.		Pkg.
Single Nut
40mm	80mm	Black	Zinc-Plated Steel	M8	Offset	10	00000000	00000
45mm	90mm	Black	Zinc-Plated Steel	M8	Offset	10	00000000	0000
Double Nut
40mm	80mm	Black	Zinc-Plated Steel	M8	Offset	10	00000000	0000
45mm	90mm	Black	Zinc-Plated Steel	M8	Offset	10	00000000	00000
Self-Aligning Nut
40mm	80mm	Silver	Steel	M8	Center	1	00000000	0000

Drop-In Fasteners

Hammer Nut

Drop-in fasteners can be placed directly into the T-slot to attach components—no need to disassemble your existing structure. They consist of a screw and nut.

Hammer fasteners drop in to the slot and turn into place when the screw is tightened. They're serrated to break the anodized coating on the rail, allowing static to dissipate.

For Rail Ht.				Mounting
Single	Double and Quad	Color	Material	Hole Location	Thread Size	Pkg. Qty.		Pkg.
Hammer Nut
45mm	90mm	Silver	304 Stainless Steel	Center	M8	1	00000000	00000

Lathe Chuck Jaw Nuts

Secure jaws to a CNC lathe chuck with industry standard 1.5 mm × 60° serrations or wider 3 mm × 60° serrations.

Jaw nuts with M6, M8, M10, M12, M16, and M20 threads fit most chucks made by Kitagawa, LMC, Samchully, Seoam, Auto Strong, and other brands.

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

Jaw Nuts with Metric Threads

		Thread		Base
For Lathe Chuck Dia.	For Slot Wd.	Size	Pitch, mm	Ht.	Lg.	Wd.	Overall Ht.	For Serration Size	Mounting Hole Ctr.-to-Ctr.	Material		Each
5"	0.392"	M8	1.25	7/32"	1 11/64"	35/64"	39/64"	1.5 mm × 60°	0.713"	Steel	0000000	000000