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Medium-Strength Metric Class 8.8 Steel Square-Neck Carriage Bolts
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 or zinc yellow-chromate plated steel bolts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Head | Neck | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg., mm | Threading | Min. Thread Lg., mm | Thread Spacing  | Dia., mm | Ht., mm | Wd., mm | Lg., mm | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
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 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
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 threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch.
For technical drawings and 3-D models, click on a part number.
Head | Neck | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Dia. | Ht. | Wd. | Lg. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||||
M8 × 1.25mm | |||||||||||
| 16mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603, ISO 8678 | 25 | 000000000 | 000000 |
| 20mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603, ISO 8678 | 25 | 000000000 | 00000 |
| 25mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603, ISO 8678 | 25 | 000000000 | 00000 |
| 30mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603, ISO 8678 | 25 | 000000000 | 00000 |
| 35mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603, ISO 8678 | 25 | 000000000 | 00000 |
| 40mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603, ISO 8678 | 10 | 000000000 | 0000 |
| 50mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603, ISO 8678 | 10 | 000000000 | 0000 |
Super-Corrosion-Resistant 316 Stainless Steel Square-Neck Carriage Bolts
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.
For technical drawings and 3-D models, click on a part number.
Head | Neck | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Dia. | Ht. | Wd. | Lg. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel | |||||||||||
M8 × 1.25mm | |||||||||||
| 20mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603 | 10 | 000000000 | 000000 |
| 25mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603 | 10 | 000000000 | 00000 |
| 30mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603 | 10 | 000000000 | 00000 |
| 40mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603 | 10 | 000000000 | 00000 |
| 50mm | Fully Threaded | Coarse | 20.65mm | 4.88mm | 8mm | 5.6mm | 70,000 | DIN 603 | 5 | 000000000 | 0000 |