ISO 8678 Carriage Bolts | McMaster-Carr

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68 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 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 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







				M6 × 1 mm

				12	Fully Threaded	Coarse	16.55	3.8	6	4.6	70,000	DIN 603, ISO 8678	50	000000000	000000


				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