1/2"-28 Threaded Rods | McMaster-Carr

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55 Products

Round Coupling Nuts

Less bulky than hex coupling nuts, these have a smooth, round body that fits in tight spots. Their finished appearance makes them a common choice for decorative applications. Tighten by hand, or use soft-jaw pliers to avoid marring the outside surface. Also known as extension nuts, they are commonly used to connect lengths of threaded rod and join threaded parts.

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

Steel

Black-Oxide Steel—A dark, matte coating creates a finished look. Nuts offer minimal corrosion resistance, so they're best for dry environments.

							Each
	Thread Size	Lg.	OD	Threading	Specs. Met		1-9	10-Up
Black-Oxide Steel



		1/2"-28	1 1/4"	37/64"	Fully Threaded	ASTM A108	96177A460	000000	000000

Inch-to-Inch Female Hex Thread Adapters

Connect two differently sized male-threaded parts, such as threaded rods, and tighten with a standard wrench. The threads on these adapters have various sizes and spacing, so you can increase or decrease thread size or adapt from coarse to fine threading. You can also use them to change the gender of a connection from male to female. Small adapters can work as threaded standoffs, which position and separate circuit boards and other components in assemblies.

Aluminum—Aluminum adapters are about one third of the weight of steel adapters and resist corrosion in wet environments.

18-8 Stainless Steel—18-8 stainless steel adapters withstand wet environments but will corrode when exposed to salt water and other chloride solutions.

316 Stainless Steel—316 stainless steel adapters are ideal in wet environments and will not corrode when exposed to salt water or harsh chemicals.

ASTM A276, ASTM A582, and ASTM B211—Adapters that meet ASTM specifications are made from or plated with materials that adhere to specific standards for chemical and physical properties, such as hardness.

			Thread Lg.		Thread Fit		Hex								Each
	Thread Size (A)	Thread Size (B)	(A)	(B)	(A)	(B)	Size	Length	Specs. Met	Tensile Strength, psi	Hardness	Certificate Form	Certificate Type		1-9	10-Up
Aluminum



		3/8"-16	1/2"-28	3/8"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM B211	45,000	Rockwell B56	—	—	91072A290	00000	00000


		1/2"-13	1/2"-28	1/2"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	2 1/4"	ASTM B211	45,000	Rockwell B56	—	Material Certificate with Traceable Lot Number	91072A302	0000	0000
		1/2"-28	5/8"-11	1/2"	5/8"	Unified Standard Class 2B	Unified Standard Class 2B	7/8"	1 3/4"	ASTM B211	45,000	Rockwell B56	—	—	91072A308	0000	0000
		1/2"-28	3/4"-10	1/2"	3/4"	Unified Standard Class 2B	Unified Standard Class 2B	1"	2 1/4"	ASTM B211	45,000	Rockwell B56	—	—	91072A309	0000	0000


		18-8 Stainless Steel



				1/4"-20	1/2"-28	5/8"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A582	85,000	Rockwell B80	—	—	91072A127	0000	0000


				1/4"-28	1/2"-28	1/4"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A582	85,000	Rockwell B80	Digital	Material Certificate with Traceable Lot Number	91072A137	00000	0000
				1/4"-32	1/2"-28	1/4"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A582	85,000	Rockwell B80	—	Material Certificate with Traceable Lot Number	91072A146	00000	00000
				5/16"-18	1/2"-28	5/16"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A582	85,000	Rockwell B80	Digital	Material Certificate with Traceable Lot Number	91072A151	00000	0000
				5/16"-24	1/2"-28	5/16"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A582	85,000	Rockwell B80	—	—	91072A158	00000	0000
				5/16"-32	1/2"-28	5/16"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A582	85,000	Rockwell B80	—	Material Certificate with Traceable Lot Number	91072A164	00000	00000
				3/8"-16	1/2"-28	3/8"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A582	85,000	Rockwell B80	—	—	91072A167	00000	0000
				3/8"-24	1/2"-28	3/8"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A582	85,000	Rockwell B80	—	—	91072A171	00000	0000
				3/8"-32	1/2"-28	3/8"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A582	85,000	Rockwell B80	—	Material Certificate with Traceable Lot Number	91072A176	00000	0000
				1/2"-13	1/2"-28	1/2"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	2 1/4"	ASTM A582	85,000	Rockwell B80	—	—	91072A179	00000	00000
				1/2"-20	1/2"-28	1/2"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	2 1/4"	ASTM A582	85,000	Rockwell B80	—	—	91072A180	00000	00000


				1/2"-28	5/8"-11	1/2"	5/8"	Unified Standard Class 2B	Unified Standard Class 2B	7/8"	1 3/4"	ASTM A582	85,000	Rockwell B80	—	—	91072A184	00000	00000
				1/2"-28	3/4"-10	1/2"	3/4"	Unified Standard Class 2B	Unified Standard Class 2B	1"	2 1/4"	ASTM A582	85,000	Rockwell B80	—	—	91072A185	00000	00000
				1/2"-28	1"-8	1/2"	1"	Unified Standard Class 2B	Unified Standard Class 2B	1 3/8"	2"	ASTM A582	85,000	Rockwell B80	—	—	91072A186	00000	00000


				316 Stainless Steel



						1/4"-20	1/2"-28	5/8"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A276	75,000	Rockwell B83	Digital	Material Certificate with Traceable Lot Number	91072A212	00000	0000


						5/16"-18	1/2"-28	5/16"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A276	75,000	Rockwell B83	—	Material Certificate with Traceable Lot Number	91072A229	00000	00000
						3/8"-16	1/2"-28	3/8"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	1 1/4"	ASTM A276	75,000	Rockwell B83	—	—	91072A241	00000	00000
						1/2"-13	1/2"-28	1/2"	1/2"	Unified Standard Class 2B	Unified Standard Class 2B	5/8"	2 1/4"	ASTM A276	75,000	Rockwell B83	Digital	Material Certificate with Traceable Lot Number	91072A253	00000	00000
						1/2"-28	5/8"-11	1/2"	5/8"	Unified Standard Class 2B	Unified Standard Class 2B	7/8"	1 3/4"	ASTM A276	75,000	Rockwell B83	Digital	Material Certificate with Traceable Lot Number	91072A260	00000	00000
						1/2"-28	3/4"-10	1/2"	3/4"	Unified Standard Class 2B	Unified Standard Class 2B	1"	2 1/4"	ASTM A276	75,000	Rockwell B83	—	—	91072A261	00000	00000
						1/2"-28	1"-8	1/2"	1"	Unified Standard Class 2B	Unified Standard Class 2B	1 3/8"	2"	ASTM A276	75,000	Rockwell B83	—	—	91072A262	00000	00000

Inch-to-Metric Female Hex Thread Adapters

Adapt threaded rods from inch to metric. These adapters connect two male-threaded fasteners, so you can change the gender of a mating part or increase or decrease its thread size. The hex-shaped body fits into the head of a standard wrench. Small adapters can also be used as standoffs, positioning and separating circuit boards and other components in assemblies.

Aluminum—At about a third of the weight of steel adapters, aluminum adapters are the lightest we offer. They resist corrosion in wet environments.

18-8 Stainless Steel—18-8 stainless steel adapters resist corrosion caused by water. They're good for wet and damp environments but will corrode when exposed to salt water and other chloride solutions.

316 Stainless Steel—316 stainless steel adapters have the best corrosion resistance. They stand up to wet environments, just like 18-8 stainless steel adapters, but unlike 18-8 stainless steel adapters, they resist corrosion caused by salt water and harsh chemicals.

			Thread Lg.		Thread Fit		Hex, mm								Each
	Thread Size (A)	Thread Size (B)	(A)	(B), mm	(A)	(B)	Size	Length	Specs. Met	Tensile Strength, psi	Hardness	Certificate Form	Certificate Type		1-9	10-Up
Aluminum



		1/2"-28	M6 x 1 mm	1/2"	6	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM B211	45,000	Rockwell B56	—	—	91079A186	000000	000000


		1/2"-28	M8 x 1.25 mm	1/2"	8	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM B211	45,000	Rockwell B56	—	—	91079A187	00000	00000
		1/2"-28	M10 x 1 mm	1/2"	10	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM B211	45,000	Rockwell B56	—	Material Certificate with Traceable Lot Number	91079A188	00000	00000
		1/2"-28	M10 x 1.25 mm	1/2"	10	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM B211	45,000	Rockwell B56	Digital	Material Certificate with Traceable Lot Number	91079A189	00000	00000
		1/2"-28	M10 x 1.5 mm	1/2"	10	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM B211	45,000	Rockwell B56	—	Material Certificate with Traceable Lot Number	91079A190	00000	00000
		1/2"-28	M12 x 1.25 mm	1/2"	12	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM B211	45,000	Rockwell B56	—	Material Certificate with Traceable Lot Number	91079A191	00000	00000
		1/2"-28	M12 x 1.75 mm	1/2"	12	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM B211	45,000	Rockwell B56	—	Material Certificate with Traceable Lot Number	91079A192	00000	00000
		1/2"-28	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM B211	45,000	Rockwell B56	—	—	91079A193	00000	00000


		18-8 Stainless Steel



				1/2"-28	M6 x 0.75 mm	1/2"	6	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	—	—	98434A843	00000	00000


				1/2"-28	M6 x 1 mm	1/2"	6	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	—	Material Certificate with Traceable Lot Number	98434A844	00000	00000
				1/2"-28	M8 x 1 mm	1/2"	8	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	Digital	Material Certificate with Traceable Lot Number	98434A845	00000	00000
				1/2"-28	M8 x 1.25 mm	1/2"	8	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	—	Material Certificate with Traceable Lot Number	98434A846	00000	00000
				1/2"-28	M10 x 1 mm	1/2"	10	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	Digital	Material Certificate with Traceable Lot Number	98434A847	00000	00000
				1/2"-28	M10 x 1.25 mm	1/2"	10	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	—	Material Certificate with Traceable Lot Number	98434A848	00000	00000
				1/2"-28	M10 x 1.5 mm	1/2"	10	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	—	Material Certificate with Traceable Lot Number	98434A849	00000	00000
				1/2"-28	M12 x 1.25 mm	1/2"	12	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	—	Material Certificate with Traceable Lot Number	98434A850	00000	00000
				1/2"-28	M12 x 1.5 mm	1/2"	12	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	—	Material Certificate with Traceable Lot Number	98434A851	00000	00000
				1/2"-28	M12 x 1.75 mm	1/2"	12	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A582	85,000	Rockwell B80	—	—	98434A852	00000	00000
				1/2"-28	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM A582	85,000	Rockwell B80	Digital	Material Certificate with Traceable Lot Number	98434A853	00000	00000


				316 Stainless Steel



						1/2"-28	M6 x 1 mm	1/2"	6	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A276	75,000	Rockwell B83	—	Material Certificate with Traceable Lot Number	91076A217	00000	00000


						1/2"-28	M8 x 1 mm	1/2"	8	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A276	75,000	Rockwell B83	—	Material Certificate with Traceable Lot Number	91076A218	00000	00000
						1/2"-28	M8 x 1.25 mm	1/2"	8	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A276	75,000	Rockwell B83	—	Material Certificate with Traceable Lot Number	91076A219	00000	00000
						1/2"-28	M10 x 1 mm	1/2"	10	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A276	75,000	Rockwell B83	—	Material Certificate with Traceable Lot Number	91076A220	00000	00000
						1/2"-28	M10 x 1.25 mm	1/2"	10	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A276	75,000	Rockwell B83	—	Material Certificate with Traceable Lot Number	91076A221	00000	00000
						1/2"-28	M10 x 1.5 mm	1/2"	10	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A276	75,000	Rockwell B83	—	Material Certificate with Traceable Lot Number	91076A222	00000	00000
						1/2"-28	M12 x 1.25 mm	1/2"	12	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A276	75,000	Rockwell B83	—	—	91076A223	00000	00000
						1/2"-28	M12 x 1.5 mm	1/2"	12	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A276	75,000	Rockwell B83	—	Material Certificate with Traceable Lot Number	91076A224	00000	00000
						1/2"-28	M12 x 1.75 mm	1/2"	12	Unified Standard Class 2B	Metric Class 6H	18	38	ASTM A276	75,000	Rockwell B83	—	Material Certificate with Traceable Lot Number	91076A225	00000	00000
						1/2"-28	M16 x 2 mm	1/2"	16	Unified Standard Class 2B	Metric Class 6H	21	54	ASTM A276	75,000	Rockwell B83	Digital	Material Certificate with Traceable Lot Number	91076A226	00000	00000