Metric Carriage Screws | McMaster-Carr

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108 Products

Medium-Strength Metric Class 8.8 Steel Square-Neck Carriage Bolts


Fully Threaded	Partially Threaded

These Class 8.8 steel bolts are suitable for fastening most machinery and equipment. A square neck keeps them from turning when tightening a nut. A smooth, rounded head provides a finished look. Length is measured from under the head.

Zinc Plated—Zinc plated steel bolts resist corrosion in wet environments.

Zinc Yellow-Chromate Plated—Zinc yellow-chromate plated steel bolts resist corrosion in wet environments.

					Head, mm		Neck, mm
	Lg., mm	Threading	Min. Thread Lg., mm	Thread Spacing	Dia.	Ht.	Wd.	Lg.	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.
ISO Class 8.8 Steel







				M8 × 1.25 mm

				20	Fully Threaded	—	Coarse	18	4.8	8.58	3	110,000	ASME B18.5, ISO 8678	50	000000000	00000


				25	Fully Threaded	—	Coarse	18	4.8	8.58	3	110,000	ASME B18.5, ISO 8678	25	000000000	0000
				30	Fully Threaded	—	Coarse	18	4.8	8.58	3	110,000	ASME B18.5, ISO 8678	25	000000000	0000




						M10 × 1.5 mm

						25	Fully Threaded	—	Coarse	22.3	5.8	10.58	4	110,000	ASME B18.5, ISO 8678	25	000000000	0000




								M12 × 1.75 mm

								30	Fully Threaded	—	Coarse	26.6	6.8	12.7	4	110,000	ASME B18.5, ISO 8678	10	000000000	0000




										M16 × 2 mm

										60	Fully Threaded	—	Coarse	35	8.9	16.7	5	120,000	ASME B18.5, ISO 8678	1	000000000	0000


										100	Partially Threaded	38	Coarse	35	8.9	16.7	5	120,000	ASME B18.5, ISO 8678	1	000000000	0000




												M20 × 2.5 mm

												60	Fully Threaded	—	Coarse	43	10.9	20.84	5	120,000	ASME B18.5, ISO 8678	1	000000000	0000


												Zinc Plated ISO Class 8.8 Steel







																M6 × 1 mm

																12	Fully Threaded	—	Coarse	16.55	3.88	6.48	4.6	110,000	DIN 603	25	000000000	0000


																16	Fully Threaded	—	Coarse	16.55	3.88	6.48	4.6	110,000	DIN 603	25	000000000	0000
																20	Fully Threaded	—	Coarse	16.55	3.88	6.48	4.6	110,000	DIN 603	25	000000000	0000
																25	Fully Threaded	—	Coarse	16.55	3.88	6.48	4.6	110,000	DIN 603	25	000000000	0000
																30	Partially Threaded	18	Coarse	16.55	3.88	6.48	4.6	110,000	DIN 603	25	000000000	00000
35																Partially Threaded	18	Coarse	16.55	3.88	6.48	4.6	110,000	DIN 603	25	000000000	00000
40	Partially Threaded															18	Coarse	16.55	3.88	6.48	4.6	110,000	DIN 603	25	000000000	00000


Zinc Yellow-Chromate Plated ISO Class 8.8 Steel







																M6 × 1 mm

																50	Fully Threaded	—	Coarse	14.2	3.6	6.48	3	110,000	ASME B18.5, ISO 8678	25	000000000	00000


				70												Partially Threaded	18	Coarse	14.2	3.6	6.48	3	110,000	ASME B18.5, ISO 8678	25	000000000	00000




																M8 × 1.25 mm

						16										Fully Threaded	—	Coarse	18	4.8	8.58	3	110,000	ISO 8678	100	000000000	00000


						20	Fully Threaded									—	Coarse	18	4.8	8.58	3	110,000	ISO 8678	100	000000000	00000
						25	Fully Threaded									—	Coarse	18	4.8	8.58	3	110,000	ISO 8678	50	000000000	00000
						30	Fully Threaded									—	Coarse	18	4.8	8.58	3	110,000	ISO 8678	50	000000000	00000
						35	Fully Threaded									—	Coarse	18	4.8	8.58	3	110,000	ISO 8678	50	000000000	00000
						40	Fully Threaded	—								Coarse	18	4.8	8.58	3	110,000	ISO 8678	50	000000000	00000
						45	Fully Threaded	—	Coarse							18	4.8	8.58	3	110,000	ISO 8678	50	000000000	00000
						50	Fully Threaded	—	Coarse							18	4.8	8.58	3	110,000	ISO 8678	50	000000000	00000
						55	Partially Threaded	22	Coarse							18	4.8	8.58	3	110,000	ISO 8678	25	000000000	00000
						60	Partially Threaded	22	Coarse							18	4.8	8.58	3	110,000	ISO 8678	25	000000000	00000
						80	Partially Threaded	22	Coarse							18	4.8	8.58	3	110,000	ISO 8678	25	000000000	00000


						90	Partially Threaded	22	Coarse							18	4.8	8.58	3	110,000	ISO 8678	25	000000000	00000




								M10 × 1.5 mm

								20	Fully Threaded	—	Coarse					22.3	5.8	10.58	4	110,000	ISO 8678	50	000000000	00000


								25	Fully Threaded	—	Coarse					22.3	5.8	10.58	4	110,000	ISO 8678	25	000000000	0000
								30	Partially Threaded	26	Coarse	22.3				5.8	10.58	4	110,000	ASME B18.5, ISO 8678	25	000000000	00000
								35	Fully Threaded	—	Coarse	22.3	5.8			10.58	4	110,000	ISO 8678	25	000000000	00000
								40	Fully Threaded	—	Coarse	22.3	5.8			10.58	4	110,000	ISO 8678	25	000000000	00000
								45	Fully Threaded	—	Coarse	22.3	5.8			10.58	4	110,000	ISO 8678	25	000000000	00000
								50	Fully Threaded	—	Coarse	22.3	5.8	10.58		4	110,000	ISO 8678	25	000000000	00000
								60	Partially Threaded	26	Coarse	22.3	5.8	10.58	4	110,000	ISO 8678	10	000000000	0000
								70	Partially Threaded	26	Coarse	22.3	5.8	10.58	4	110,000	ISO 8678	10	000000000	0000
								80	Partially Threaded	26	Coarse	22.3	5.8	10.58	4	110,000	ISO 8678	10	000000000	0000
								90	Partially Threaded	26	Coarse	22.3	5.8	10.58	4	110,000	ISO 8678	10	000000000	00000


								100	Partially Threaded	26	Coarse	22.3	5.8	10.58	4	110,000	ASME B18.5, ISO 8678	10	000000000	00000




										M12 × 1.75 mm

										25	Fully Threaded	—	Coarse	26.6	6.8	12.7	4	110,000	ASME B18.5, ISO 8678	25	000000000	00000


30	Fully Threaded									—	Coarse	26.6	6.8	12.7	4	110,000	ISO 8678	25	000000000	00000
35	Fully Threaded									—	Coarse	26.6	6.8	12.7	4	110,000	ASME B18.5, ISO 8678	25	000000000	00000
40	Fully Threaded									—	Coarse	26.6	6.8	12.7	4	110,000	ISO 8678	25	000000000	00000
45	Fully Threaded	—								Coarse	26.6	6.8	12.7	4	110,000	ISO 8678	25	000000000	00000
50	Fully Threaded	—	Coarse							26.6	6.8	12.7	4	110,000	ISO 8678	25	000000000	00000
55	Partially Threaded	30	Coarse							26.6	6.8	12.7	4	110,000	ASME B18.5, ISO 8678	10	000000000	0000
60	Partially Threaded	30	Coarse							26.6	6.8	12.7	4	110,000	ISO 8678	10	000000000	0000
70	Partially Threaded	30	Coarse							26.6	6.8	12.7	4	110,000	ASME B18.5, ISO 8678	5	000000000	0000




		M16 × 2 mm

		40	Fully Threaded	—						Coarse	35	8.9	16.7	5	120,000	ASME B18.5, ISO 8678	5	000000000	0000


		45	Fully Threaded	—	Coarse					35	8.9	16.7	5	120,000	ASME B18.5, ISO 8678	5	000000000	0000
		50	Fully Threaded	—	Coarse					35	8.9	16.7	5	120,000	ASME B18.5, ISO 8678	5	000000000	0000
		60	Fully Threaded	—	Coarse					35	8.9	16.7	5	120,000	ASME B18.5, ISO 8678	1	000000000	0000
		70	Partially Threaded	38	Coarse					35	8.9	16.7	5	120,000	ASME B18.5, ISO 8678	1	000000000	0000
		80	Partially Threaded	38	Coarse					35	8.9	16.7	5	120,000	ASME B18.5, ISO 8678	1	000000000	0000
		100	Partially Threaded	38	Coarse					35	8.9	16.7	5	120,000	ASME B18.5, ISO 8678	1	000000000	0000

18-8 Stainless Steel Square-Neck Carriage Bolts


	Fully Threaded

Made from 18-8 stainless steel, these bolts have good chemical resistance and may be mildly magnetic. They're a good choice for ACQ-treated (arsenic-free) lumber. A square neck keeps them from turning when tightening a nut. A smooth, rounded head provides a finished look. Length is measured from under the head. Dimensions meet ASME B18.5 or DIN 603 specifications. Some also meet ISO 8678. DIN 603 is functionally equivalent to ISO 8678 with slight differences in head diameter, head height, and length tolerances.

Match the thread spacing of mating components.

Coarse Thread—Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch.

				Head, mm		Neck, mm
	Lg., mm	Threading	Thread Spacing	Dia.	Ht.	Wd.	Lg.	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				M5 × 0.8 mm

				10	Fully Threaded	Coarse	13.55	3.3	5.48	4.1	70,000	DIN 603	50	000000000	00000


				12	Fully Threaded	Coarse	13.55	3.3	5.48	4.1	70,000	DIN 603	25	000000000	0000
				16	Fully Threaded	Coarse	13.55	3.3	5.48	4.1	70,000	DIN 603	25	000000000	0000
				20	Fully Threaded	Coarse	13.55	3.3	5.48	4.1	70,000	DIN 603	25	000000000	0000
				25	Fully Threaded	Coarse	13.55	3.3	5.48	4.1	70,000	DIN 603	25	000000000	0000
				30	Fully Threaded	Coarse	13.55	3.3	5.48	4.1	70,000	DIN 603	25	000000000	0000
				35	Fully Threaded	Coarse	13.55	3.3	5.48	4.1	70,000	DIN 603	10	000000000	0000




						M6 × 1 mm

						12	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603, ISO 8678	50	000000000	00000


						16	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603, ISO 8678	50	000000000	00000
						20	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603, ISO 8678	50	000000000	00000
						25	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603, ISO 8678	50	000000000	00000
						30	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603, ISO 8678	50	000000000	00000
						40	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603, ISO 8678	25	000000000	0000




								M8 × 1.25 mm

								16	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603, ISO 8678	25	000000000	00000


								20	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603, ISO 8678	25	000000000	00000
								25	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603, ISO 8678	25	000000000	00000
								30	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603, ISO 8678	25	000000000	00000
								35	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603, ISO 8678	25	000000000	00000
								40	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603, ISO 8678	10	000000000	0000
								50	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603, ISO 8678	10	000000000	0000




										M10 × 1.5 mm

										20	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603, ISO 8678	10	000000000	0000


										25	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603, ISO 8678	10	000000000	0000
										30	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603, ISO 8678	10	000000000	0000
										35	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603, ISO 8678	10	000000000	00000
										40	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603, ISO 8678	10	000000000	00000




M12 × 1.75 mm

25	Fully Threaded											Coarse	30.65	6.95	12.7	8.7	70,000	DIN 603	5	000000000	0000


30	Fully Threaded											Coarse	30.65	6.95	12.7	8.7	70,000	DIN 603	5	000000000	0000
35	Fully Threaded	Coarse										30.65	6.95	12.7	8.7	70,000	DIN 603	5	000000000	0000
40	Fully Threaded	Coarse	30.65									6.95	12.7	8.7	70,000	DIN 603	5	000000000	0000
50	Fully Threaded	Coarse	30.65									6.95	12.7	8.7	70,000	DIN 603	1	000000000	0000
60	Fully Threaded	Coarse	30.65									6.95	12.7	8.7	70,000	DIN 603	1	000000000	0000
80	Fully Threaded	Coarse	30.65									6.95	12.7	8.7	70,000	DIN 603	1	000000000	0000




		M16 × 2 mm

		40	Fully Threaded									Coarse	38.8	8.95	16.7	12.9	70,000	DIN 603	1	000000000	0000


		50	Fully Threaded									Coarse	38.8	8.95	16.7	12.9	70,000	DIN 603	1	000000000	0000
		60	Fully Threaded									Coarse	38.8	8.95	16.7	12.9	70,000	DIN 603	1	000000000	0000
		80	Fully Threaded	Coarse								38.8	8.95	16.7	12.9	70,000	DIN 603	1	000000000	0000

Highly Corrosion-Resistant 316 Stainless Steel Square-Neck Carriage Bolts


	Fully Threaded

More corrosion resistant than 18-8 stainless steel bolts, these 316 stainless steel bolts have excellent resistance to chemicals and salt water and are a good choice for ACQ-treated (arsenic-free) lumber. They may be mildly magnetic. A square neck keeps them from turning when tightening a nut. A smooth, rounded head provides a finished look. Dimensions meet ASME B18.5 or DIN 603 specifications. Length is measured from under the head.

				Head, mm		Neck, mm
	Lg., mm	Threading	Thread Spacing	Dia.	Ht.	Wd.	Lg.	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.
316 Stainless Steel







				M6 × 1 mm

				20	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603	10	000000000	00000


				25	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603	10	000000000	0000
				30	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603	10	000000000	0000
				40	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603	10	000000000	0000
				50	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603	10	000000000	0000




						M8 × 1.25 mm

						20	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603	10	000000000	00000


						25	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603	10	000000000	00000
						30	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603	10	000000000	00000
						40	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603	10	000000000	00000
						50	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603	5	000000000	0000




								M10 × 1.5 mm

								25	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603	5	000000000	0000


								30	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603	5	000000000	00000
								40	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603	5	000000000	00000
								50	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603	5	000000000	00000
								70	Fully Threaded	Coarse	24.65	5.38	10	6.6	70,000	DIN 603	1	000000000	0000