Here are some things to know about hex bolts:
- Head: The head of a hex bolt is a solid, integrated piece of material with six uniform sides. It doesn’t have a recess, which is more common with screws.
- Types: Hex bolts can be fully threaded or partially threaded. Partially threaded bolts have an unthreaded area under the head, which provides more holding strength.
- Materials: Hex bolts can be made from a variety of materials, including super duplex hex bolt, hastelloy hex bolt, Inconel hex bolt & Incoloy hex bolt , and other stainelss steel .
- Uses: Hex bolts are used to secure objects within or against other objects, such as fastening steel to steel or wood to wood. They are also used in heavy-duty applications, such as highway structures, bridges, and buildings.
- Installation: Hex bolts are typically installed and removed with socket wrenches.
- Measurements: Hex bolts are measured by their length, diameter, and thread pitch.
| All Material for the bolts | ||||
| Hastelloy C276 | Duplex 2205 | A193 B8 | SS304 | Inconel600 |
| Hastelloy C22 | Duplex S31803 | B193 B8M | SS316 | Inconel601 |
| Hastelloy C4 | Super duplex S32750 | Alloy59 | SS316L | Incoloy718 |
| Monel400 | Super duplex 2507 | Alloy20 | Stainless steel 18-8 | Incoloy800H |
| Monelk500 | 904L | 309S | SS321 | Incoloy800 |
| Nimonic 80A | Alloy 926 -UNS N08926 | 310S | 317L | Incoloy825 |
How to examine the quality of a bolt, for exemple, for 904L bolt, primarily check the markings on the bolt head to identify its grade, which indicates its strength, as well as visually inspect for any signs of damage like rust, bends, or deformations, and ensure the threads are intact; for a more thorough assessment, consider using specialized testing methods like ultrasonic or eddy current inspection to detect internal flaws. Key points to check:
Head markings:
Most bolts such as Monel400 bolt,Monelk500 bolt have markings on the head, usually numbers or dashes, that indicate their grade and strength level; higher numbers signify a stronger bolt.
Visual inspection:
For Nimonic 80A hex bolt as an exemple, you could Look for signs of rust, corrosion, visible dents, bends, or other damage on the bolt body and threads.
Thread condition:
Check if the threads are clean, intact, and properly formed.
Manufacturer markings:
Take duplex 2205 hex head bolt, you also could Identify the manufacturer’s mark to verify the bolt’s origin and potential quality standards.
Advanced methods for bolt quality checks,such as Inconel 600 hex bolt , C276 bolts,
- Tensile testing:This laboratory test applies tension to the bolt until it breaks, providing precise data on its ultimate tensile strength.
- Ultrasonic testing:Uses sound waves to detect internal flaws within the bolt material.
- Eddy current testing:Detects surface imperfections and irregularities using electromagnetic fields.
- Hardness testing:Measures the bolt’s hardness, which is related to its strength.
