Concealed T Slots | McMaster-Carr

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T-Slotted Framing Rail Profile

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T-Slotted Framing Component

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For Rail Connection Angle

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Mounting Fastener Thread Size

Number of Mounting Fasteners Included

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Compliant with Exemptions

Rail Machining Required

Yes

Export Control Classification Number (ECCN)

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

DFARS Specialty Metals

Exempt

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T-Slotted Framing Brackets

Connect T-slotted rails for structural stability. Fasteners are included.

Set Screw Corner Concealed Brackets


Standard	Extended

Set screw corner concealed brackets slide into the T-slots of your two intersecting rails, leaving the outside surface slots open for mounting other components. Tighten the included set screws to hold them in place. They mount internally and stay out of sight once installed.

	For Rail Ht.						Silver
	Single	Double and Quad	Triple	Lg.	Rail Machining Req.	Mounting Fasteners Included	Material		Each
Standard



		1", 25 mm	2", 50 mm	3"	13/16"	No	Yes	Zinc Alloy	5537T315	00000


		1 1/2", 30 mm, 40 mm	3", 60 mm, 80 mm	4 1/2"	—	No	Yes	Zinc Alloy	5537T316	0000
		45 mm	90 mm	—	—	No	Yes	Zinc Alloy	5537T323	0000


		Extended



				1 1/2", 40 mm	3", 80 mm	4 1/2", 120 mm	2 1/2"	No	Yes	Anodized Aluminum	3136N248	00000

Set Screw Straight Concealed Brackets

Set screw straight concealed brackets slide into T-slots and stay out of sight once installed. To assemble, insert the bracket into one rail and tighten the set screw. Then slide the nut through the slot of the other rail.

For Rail Ht.					Silver
Single	Double and Quad	Triple	Rail Machining Req.	Mounting Fasteners Included	Material		Each



	1 1/2", 40 mm	3", 80 mm	4 1/2"	No	Yes	Zinc-Plated Steel	5537T294	00000


	30 mm	60 mm	—	No	Yes	Zinc-Plated Steel	5537T313	0000
	45 mm	90 mm	—	No	Yes	Zinc-Plated Steel	5537T278	0000

Barrel Concealed Brackets

Barrel concealed brackets thread directly into a T-slot and use the included fastener to secure. They mount internally and stay out of sight once installed.

For Rail Ht.					Silver
Single	Double and Quad	Triple	Rail Machining Req.	Mounting Fasteners Included	Material		Each



	1 1/2", 40 mm	3", 80 mm	4 1/2"	No	Yes	Zinc-Plated Steel	47065T339	000000


	20 mm	40 mm	—	No	Yes	Zinc-Plated Steel	5537T326	0000
	30 mm	60 mm	—	No	Yes	Zinc-Plated Steel	5537T327	0000
	45 mm	90 mm	—	No	Yes	Zinc-Plated Steel	5537T328	00000

Anchor Concealed Brackets

Anchor concealed brackets allow positioning anywhere along the mating rail’s T-slot. Drill a bore hole in the face of one rail to install. Since the fastener is machined into the rail profile, these brackets create stronger connections than other brackets that don’t require machining. They mount internally and stay out of sight once installed. You can also use these brackets with our rails with machined bore holes.

For Rail Ht.							Silver			Black
Single	Double and Quad	Triple	Rail Machining Req.	No. of Installation Holes Req.	Req. Installation Hole Dia.	Mounting Fasteners Included	Material		Each	Material		Each



	1", 25 mm	2", 50 mm	3"	Yes	1	9/16"	Yes	Zinc Alloy	47065T153	00000	Zinc Alloy	3136N237	00000


	1 1/2"	3"	4 1/2"	Yes	1	13/16"	Yes	Zinc Alloy	47065T154	0000	Zinc Alloy	3136N238	0000
	20 mm	40 mm	—	Yes	1	12 mm	Yes	Zinc Alloy	5537T64	0000	—	———	0
	30 mm	60 mm	—	Yes	1	20 mm	Yes	Zinc Alloy	5537T861	0000	—	———	0
	40 mm	80 mm	—	Yes	1	20 mm	Yes	Zinc Alloy	5537T34	0000	—	———	0
	45 mm	90 mm	—	Yes	1	20 mm	Yes	Zinc Alloy	5537T276	0000	—	———	0

Double Anchor Concealed Brackets


For Single Rails	For Double and Quad Rails

Double anchor concealed brackets allow positioning anywhere along the mating rail’s T-slot. Drill bore holes in two faces of one rail to install. Since the fasteners are machined into the rail profile, these brackets create stronger connections than other brackets that don’t require machining. They mount internally and stay out of sight once installed.

						Silver
	For Rail Ht.	Rail Machining Req.	No. of Installation Holes Req.	Req. Installation Hole Dia.	Mounting Fasteners Included	Material		Each
For Single Rails



		1"	Yes	2	9/16"	Yes	Zinc Alloy	3136N239	000000


		1 1/2"	Yes	2	13/16"	Yes	Zinc Alloy	3136N241	00000
		40 mm	Yes	2	20 mm	Yes	Zinc Alloy	3136N926	00000


		For Double and Quad Rails



				2"	Yes	2	9/16"	Yes	Zinc Alloy	3136N242	00000


				3"	Yes	2	13/16"	Yes	Zinc Alloy	3136N243	00000

Butt Anchor Concealed Brackets

Image of ProductInUse. Front orientation. Exploded view. T-Slotted Framing and Fittings. T-Slotted Framing Brackets, Butt Anchor Concealed Brackets.

Butt anchor concealed brackets join rails end-to-end to create longer rails. Drill a bore hole in the face of each rail to install. Since the fasteners are machined into the rail profile, these brackets create stronger connections than other brackets that don’t require machining. They mount internally and stay out of sight once installed. You can also use these brackets with our rails with machined bore holes.

For Rail Ht.							Silver
Single	Double and Quad	Triple	Rail Machining Req.	No. of Installation Holes Req.	Req. Installation Hole Dia.	Mounting Fasteners Included	Material		Each



	1"	2"	3"	Yes	2	9/16"	Yes	Zinc Alloy	47065T404	000000


	1 1/2"	3"	4 1/2"	Yes	2	13/16"	Yes	Zinc Alloy	5537T272	00000
	20 mm	40 mm	—	Yes	2	12 mm	Yes	Zinc Alloy	5537T273	0000
	30 mm	60 mm	—	Yes	2	20 mm	Yes	Zinc Alloy	5537T562	0000
	40 mm	80 mm	—	Yes	2	20 mm	Yes	Zinc Alloy	5537T274	0000
	45 mm	90 mm	—	Yes	2	20 mm	Yes	Zinc Alloy	5537T275	0000

Tabbed Concealed Brackets


For Single Rails	For Double and Quad Rails

For Radius Two Slot Single Rails

Tabbed concealed brackets secure to the center hole on the end of your rail. Drill an access hole in the mating rail to secure the connection. They mount internally and stay out of sight once installed. You can also use these brackets with our machined rails with tapped or access holes.

Required Tap Thread Size—Brackets without a required tap thread size include thread-forming screws so you won't need to tap the end of your rail to install brackets. Use a tap (sold separately) for brackets that require a tapped hole.

	Brackets												Taps
							Silver			Black
	For Rail Ht.	Rail Machining Req.	No. of Installation Holes Req.	Req. Access Hole Dia.	Req. Tap Thread Size	Mounting Fasteners Included	Material		Each	Material		Each		Each
For Single Rails



		1", 25 mm	Yes	2	7/32"	1/4"-20	Yes	—	———	0	Zinc-Plated Steel	47065T155	00000	2521A621	00000


		1 1/2", 40 mm	Yes	1	9 mm	—	Yes	Zinc-Plated Steel	4844N41	00000	—	———	0	———	0
		1 1/2", 40 mm	Yes	2	5/16"	5/16"-18	Yes	—	———	0	Zinc-Plated Steel	47065T156	0000	2521A622	0000
		20 mm	Yes	1	4.5 mm	—	Yes	Zinc-Plated Steel	5537T63	0000	—	———	0	———	0
		30 mm	Yes	2	7.5 mm	M8	Yes	Zinc-Plated Steel	5537T549	0000	—	———	0	8305A39	00000
		40 mm	Yes	2	7.5 mm	M8	Yes	Zinc-Plated Steel	5537T33	0000	—	———	0	8305A39	00000
		45 mm	Yes	1	9.5 mm	—	Yes	Zinc-Plated Steel	5537T277	0000	—	———	0	———	0


		For Double and Quad Rails



				2"	Yes	2	7/32"	1/4"-20	Yes	—	———	0	Zinc-Plated Steel	3136N246	0000	2521A621	0000


				3"	Yes	2	5/16"	5/16"-18	Yes	—	———	0	Zinc-Plated Steel	3136N247	0000	2521A622	0000


				For Radius Two Slot Single Rails



						1", 25 mm	Yes	2	7/32"	1/4"-20	Yes	—	———	0	Zinc-Plated Steel	3136N244	0000	2521A621	0000


						1 1/2", 40 mm	Yes	2	5/16"	5/16"-18	Yes	—	———	0	Zinc-Plated Steel	3136N245	0000	2521A622	0000

Easy-Install Tabbed Concealed Brackets

Image of ProductInUse. Front orientation. Contains Annotated, Inset. T-Slotted Framing and Fittings. T-Slotted Framing Brackets, Easy-Install Tabbed Concealed Brackets.

No need to drill access holes for installation. Unlike standard tabbed concealed brackets, a set screw holds these in place. Install the included thread-forming screw in your rail end, then position the bracket anywhere along the length of another rail and tighten the set screw. These brackets mount internally and stay out of sight once installed.

				Silver
	For Rail Ht.	Rail Machining Req.	Mounting Fasteners Included	Material		Each
For Single Rails



		40 mm	No	Yes	Zinc-Plated Steel	4844N32	00000


		45 mm	No	Yes	Zinc-Plated Steel	4844N33	0000

Plate Connector Concealed Brackets

Image of ProductInUse. Front orientation. Contains MultipleImages. T-Slotted Framing and Fittings. T-Slotted Framing Brackets, Plate Connector Concealed Brackets.

Plate connector concealed brackets create a structural bracket connection point on the end of one rail that can attach at a 90° angle along another rail. They have a screw on one side and a T-slot nut on the other. Tap a hole in the end of one rail and thread in the screw. Then slide the T-slot nut into the slot of the other rail. These brackets mount internally and stay out of sight once installed.

Brackets											Taps
For Rail Ht.					Silver			Black
Single	Double and Quad, mm	Rail Machining Req.	Req. Tap Thread Size	Mounting Fasteners Included	Material		Each	Material		Each		Each



	30 mm	60	Yes	M8	Yes	Aluminum	5537T564	000000	—	———	0	8305A39	000000


	40 mm	80	No	—	Yes	—	———	0	Plastic	4844N15	000000	———	0
	45 mm	90	No	—	Yes	Aluminum	5537T579	00000	—	———	0	———	0

Easy-Adjust Plate Connector Concealed Brackets

Image of ProductInUse. Front orientation. Contains Inset. T-Slotted Framing and Fittings. T-Slotted Framing Brackets, Easy-Adjust Plate Connector Concealed Brackets.

Easy-adjust plate connector concealed brackets have fasteners that remain accessible after installation to simplify position changes. Install these brackets into the tapped end of a rail. Then, slide the spring-loaded ball nut into the slot on the other rail. Finally, fasten the outside bracket to the nut to connect the rails. You’ll get two brackets with all the included hardware. You can also use these brackets with our machined rails with tapped holes. Taps are sold separately.

	Brackets									Taps
	For Rail Ht.						Silver
	Single	Double and Quad	Triple	Rail Machining Req.	Req. Tap Thread Size	Mounting Fasteners Included	Material		Each		Each
Easy Adjust



		1 1/2", 40 mm	3", 80 mm	4 1/2", 120 mm	Yes	M8	Yes	Zinc-Plated Steel	4844N68	000000	8305A39	000000

Miter Concealed Brackets


45° Angle	90° Angle

Miter concealed brackets connect rails with 45° or 90° miters. Slide them into the T-slots and tighten them in place with the included set screws. These brackets mount internally and stay out of sight once installed.

For Rail Ht.					Silver
Single	Double and Quad	Triple	Rail Machining Req.	Mounting Fasteners Included	Material		Each







			45° Angle

			1 1/2", 30 mm, 40 mm	3", 60 mm, 80 mm	4 1/2", 120 mm	No	Yes	Zinc-Plated Steel	4844N18	000000


			45 mm, 60 mm	90 mm	—	No	Yes	Zinc-Plated Steel	4844N19	00000




					90° Angle

					1 1/2", 30 mm, 40 mm	3", 60 mm, 80 mm	4 1/2", 120 mm	No	Yes	Zinc-Plated Steel	4844N21	00000


					45 mm, 60 mm	90 mm	—	No	Yes	Zinc-Plated Steel	4844N22	00000

Adjustable Miter Concealed Brackets

Image of ProductInUse. Front orientation. Exploded view. T-Slotted Framing and Fittings. T-Slotted Framing Brackets, Adjustable Miter Concealed Brackets.

Join rails end-to-end at angles from 60° to 180°. Drill an access hole in each rail and slide the connector into the center hole, then thread the set screws into the T-nuts, through the access holes, and into the connector. These brackets mount internally and stay out of sight once installed.

For Rail Ht.						Silver
Single	Double and Quad, mm	Rail Machining Req.	No. of Installation Holes Req.	Req. Installation Hole Dia., mm	Mounting Fasteners Included	Material		Each



	45 mm	90	Yes	2	8	Yes	Zinc-Plated Steel	5537T589	00000

Miter Anchor Concealed Brackets

Image of ProductInUse. Front orientation. Exploded view. Contains Annotated. T-Slotted Framing and Fittings. T-Slotted Framing Brackets, Miter Anchor Concealed Brackets.

Create the strongest miter connection because the fasteners are machined into the rail profiles. Use them to join rails with 60°, 90°, and 180° miters. Drill a bore hole in the face of each rail to install. These brackets mount internally and stay out of sight once installed.

For Rail Ht.							Silver
Single	Double and Quad	Triple	Rail Machining Req.	No. of Installation Holes Req.	Req. Installation Hole Dia., mm	Mounting Fasteners Included	Material		Each



	1 1/2", 40 mm	3", 80 mm	4 1/2", 120 mm	Yes	2	14.2	Yes	Zinc-Plated Steel	4844N69	000000

Butt Connector Concealed Brackets


Standard	Extended

Butt connector concealed brackets join rails end-to-end to extend the length of rails without machining. Slide the connectors into a T-slot and tighten the screws to install. These brackets mount internally and stay out of sight once installed.

	For Rail Ht.					Silver
	Single	Double and Quad	Lg.	Rail Machining Req.	Mounting Fasteners Included	Material		Each
Standard



		30 mm	60 mm	2"	No	Yes	Zinc-Plated Steel	5537T592	00000


		Extended



				1 1/2", 40 mm	3", 80 mm	7"	No	Yes	Zinc-Plated Steel	5537T894	00000


				45 mm	90 mm	7"	No	Yes	Zinc-Plated Steel	5537T595	00000

Binding Barrel Concealed Brackets

Image of ProductInUse. Front orientation. Contains MultipleImages. T-Slotted Framing and Fittings. T-Slotted Framing Brackets, Binding Barrel Concealed Brackets.

Binding barrel concealed brackets thread directly into a T-slot and join rails end-to-end. They mount internally and stay out of sight once installed.

For Rail Ht.				Silver
Single	Double and Quad, mm	Rail Machining Req.	Mounting Fasteners Included	Material		Each



	20 mm	40	No	Yes	Zinc-Plated Steel	5537T581	00000


	40 mm	80	No	Yes	Zinc-Plated Steel	5537T584	00000

Composite Wood T-Slotted Framing and Fittings

Build lightweight structures, such as light duty machine guards, enclosures, and carts, with framing that is two-thirds the weight of aluminum framing. Made of 30% polypropylene and 70% wood, they’re not as strong as aluminum rails, but they’re nonconductive, easy to machine, and more corrosion resistant. Good for lab environments, they also withstand cleaning with chemicals better than aluminum. Use their continuous T-slots to attach fittings. They work with any T-slotted component for 40 mm rails that doesn’t require machining. View additional brackets and fasteners.

Concealed Brackets for Single Rails

Image of Product. Front orientation. Contains Annotated, MultipleImages. T-Slotted Framing and Fittings. Composite Wood T-Slotted Framing and Fittings, Concealed Brackets for Single Rails, Tabbed.

Tabbed

Concealed brackets mount inside rails, so they stay out of the way and out of sight once installed.

Tabbed—These brackets mount inside a hole in one rail and require a drilled access hole in the mating rail to secure the connection. They come with thread-forming screws, so you don't need to tap the end of your rail.

	Color	Material	Rail Machining Req.	Req. Access Hole Dia., mm	Mounting Fasteners Included		Each
Tabbed



	40	Silver	Zinc-Plated Steel	Yes	7	Yes	4519N11	00000