BSL-2 Studs & Nuts
- BSL-2 refers to a level of bolting specification, indicating increased technical, quality, and qualification requirements for fasteners. Specifically, BSL-2 requires non-destructive surface and ultrasonic testing to ensure bolt integrity. "STUDS L7" refers to stud bolts made from ASTM A320 Grade L7 material, a high-strength alloy steel used in low-temperature applications
BSL-2:This designation indicates a higher level of bolting specification compared to BSL-1, requiring more rigorous testing and quality control for fasteners.
STUDS / Nuts L7: These are stud bolts and nuts, that are made from ASTM A320 Grade L7 alloy steel
ASTM A320 Grade L7: This standard defines the material requirements for high tensile alloy steel bolting material used in low-temperature applications, according to ASTM A320 Grade L7.
All Coatings Available
Common coatings include Black Oxide, Zinc,
Zinc-Nickel, and Xylan.
BSL-3 Studs & Nuts
BSL-3 API studs refer to stud bolts manufactured and certified to meet the requirements of Bolting Specification Level 3 (BSL-3) under the American Petroleum Institute (API) Specification 20E (or 20F for corrosion-resistant bolting).Key aspects of BSL-3 API studs:
- API 20E/20F: These specifications establish stringent technical, quality, and qualification requirements for bolting used in the petroleum and natural gas industries.
- BSL-3 Designation: BSL-3 represents the highest and most critical level within API 20E/20F. It is reserved for applications where bolted joint failure is unacceptable and could lead to severe consequences, such as the release of hydrocarbons or other hazardous materials.
- Rigorous Requirements: BSL-3 demands extensive quality control, detailed process controls, advanced testing, and full traceability of materials and manufacturing processes. This level ensures the highest possible reliability and durability in demanding environments like subsea equipment or high-pressure wellheads.
- API Monogram: Manufacturers licensed by API to produce BSL-3 bolting are authorized to apply the API Monogram registered mark to their products, signifying conformance to the specified quality and performance standards.
- Material Grades: Common ASTM material grades used for BSL-3 API studs include A193 Grade B7 and B7M, A320 Grade L7 and L7M, and others, often with specialized coatings like Zinc Nickel + Xylan for enhanced corrosion resistance.
