Studs
Studs are metal rods with threads either on full length or at both ends. These complement with Nuts to bind the two surfaces together
Material Grade: B7, B7M, L7, L7M
Geometry: ASME B18.31.2
Threads: ASME B1.1 – UNR; ASME B1.13M – Metric
Depending on the customer’s specifications, chamfered ends are provided. Nominal Diameter sizes 5/8″ – 3″
Nut
Nuts feature internal threads that fit to create a strong attachment between the joining surfaces.
Material Grade: 2H, 2HM, 7, 7M
Geometry: ASME B18.2.2
Threads: ASME B1.1 – UN; ASME B1.13M – Metric
Nuts may either have both sides chamfered or have one side as washer-faced. Nominal Diameter sizes 5/8″ – 3″
Bolts
Bolt, the counterpart of nut, feature an external, partially or fully threaded shaft. These have a head at one end.
Material Grade: B7, B7M, L7, L7M
Geometry: ASME B18.2.1
Threads: ASME B1.1 – UNR; ASME B1.13M – Metric
Depending on the customer’s drawings, geometry is customised further. Nominal Diameter sizes 5/8″ – 3″
Surface Finish
To add corrosion resistance to the fasteners, customers choose the desired finish based on the application, exposure to elements, further treatment. CKONE offers below types of surface finishes.
- Phosphated – Manganese, Zinc
- PTFE Coated – Xylan
- Zinc Plated
Xylan Coated Nuts
Bolting Material
The below bolting grades are the regular grades that we manufacture. Stock of the raw material used to manufacture these is maintained. We understand the criticality of the role played by the fasteners and so the raw material is sourced only from the approved steel mills.
| Stud Grade | Nut Grade | Raw Material Steel Grade |
|---|---|---|
| ASTM A193 B7 | ASTM A194 2H | 4140, 4142, 4145, 4140H, 4142H, 4145H |
| ASTM A320 L7 | ASTM A194 7 | 4140, 4142, 4145, 4140H, 4142H, 4145H |
| ASTM A193 B7M | ASTM A194 2HM | 4130, 4140, 4142, 4145, 4130H, 4140H, 4142H, 4145H |
| ASTM A320 L7M | ASTM A194 7M | 4140, 4142, 4145, 4140H, 4142H, 4145H |
Bolting Applications
Our bolting products are made to the withstand high pressure high temperature environments. We manufacture certified fasteners for Oil and Gas industry.
Our API-20E certified fasteners are generally applied to below products to ensure their compliance with the respective American Petroleum Institute (API) standard.
| Product Name | API Standard |
|---|---|
| Wellheads – Christmas Tree | API 6A |
| Piping Valves | API 6D |
| Subsea Pipeline Valves | API 6DSS |
| Blowout Preventers | API 16A |
| Choke and Kill Equipment | API 16C |
| Subsea Wellhead and Tree Equipment | API 17D |