About Hex Head Screws and Bolts
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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 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 | |||||||||||
M5 × 0.8mm | |||||||||||
| 10mm | Fully Threaded | Coarse | 13.55mm | 3.3mm | 5.48mm | 4.1mm | 70,000 | DIN 603 | 50 | 000000000 | 00000 |
| 12mm | Fully Threaded | Coarse | 13.55mm | 3.3mm | 5.48mm | 4.1mm | 70,000 | DIN 603 | 25 | 000000000 | 0000 |
| 16mm | Fully Threaded | Coarse | 13.55mm | 3.3mm | 5.48mm | 4.1mm | 70,000 | DIN 603 | 25 | 000000000 | 0000 |
| 20mm | Fully Threaded | Coarse | 13.55mm | 3.3mm | 5.48mm | 4.1mm | 70,000 | DIN 603 | 25 | 000000000 | 0000 |
| 25mm | Fully Threaded | Coarse | 13.55mm | 3.3mm | 5.48mm | 4.1mm | 70,000 | DIN 603 | 25 | 000000000 | 0000 |
| 30mm | Fully Threaded | Coarse | 13.55mm | 3.3mm | 5.48mm | 4.1mm | 70,000 | DIN 603 | 25 | 000000000 | 0000 |
| 35mm | Fully Threaded | Coarse | 13.55mm | 3.3mm | 5.48mm | 4.1mm | 70,000 | DIN 603 | 10 | 000000000 | 0000 |