Manufacturer - Stud, Nut, Bolt - API Fastener

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"

Nuts

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"

Xylan Coated Nuts

Surface Finish

To add corrosion resistance to the fasteners, customers choose the desired finish based on the application, exposure to elements, further treatment. NUBOTECK offers below types of surface finishes.

Phosphated - Manganese, Zinc
PTFE Coated - Xylan
Zinc Plated

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 products to ensure safety and reliability. Applying these to the below products is requirement for the conformance to their respective American Petroleum Institute (API) specifications/ standards.

Product / Guideline	API Specification
Wellheads - Christmas Tree	API 6A
Piping Valves	API 6D
Subsea Pipeline Valves	API 6DSS
Blowout Preventers	API 16A
Choke and Kill Equipment	API 16C
Drilling Well Control Equipment & Diverter Equipment	API 16D
Marine Drilling Riser Equipment	API 16F
Marine Drilling Riser Systems	API 16Q
Subsea Wellhead and Tree Equipment	API 17D
Guidelines for High Pressure & High Temperature	API 17TR6

Studs

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Material Grade: B7, B7M, L7, L7M

Geometry: ASME B18.31.2

Threads: ASME B1.1 - UNR; ASME B1.13M - Metric

Nuts

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Material Grade: 2H, 2HM, 7, 7M

Geometry: ASME B18.2.2

Threads: ASME B1.1 - UN; ASME B1.13M - Metric

Bolts

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Material Grade: B7, B7M, L7, L7M

Geometry: ASME B18.2.1

Threads: ASME B1.1 - UNR; ASME B1.13M - Metric

Surface Finish

Bolting Material

Bolting Applications

Our API-20E certified fasteners are generally applied to products to ensure safety and reliability. Applying these to the below products is requirement for the conformance to their respective American Petroleum Institute (API) specifications/ standards.