M8 Carriage Bolts | McMaster-Carr

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27 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


				Zinc Yellow-Chromate Plated ISO Class 8.8 Steel







								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

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







				M8 × 1.25 mm

				16	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603, ISO 8678	25	000000000	000000


				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

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







				M8 × 1.25 mm

				20	Fully Threaded	Coarse	20.65	4.88	8	5.6	70,000	DIN 603	10	000000000	000000


				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