API SPEC 20F

Description

This standard specifies requirements for the qualification, production and documentation of corrosion resistant bolting used in the petroleum and natural gas industries. This standard applies when referenced by an applicable API equipment standard or otherwise specified as a requirement for compliance. This standard establishes requirements for two bolting specification levels (BSL). These two BSL designations define different levels of technical, quality, and qualification requirements: BSL-2 and BSL-3. The BSL are numbered in increasing levels of requirements in order to reflect increasing technical, quality, and qualification criteria. BSL-2 and BSL-3 are intended to be comparable to BSL-2 and BSL-3 as found in API 20E. BSL-1 is omitted from this standard. This standard covers the following product forms, processes, and sizes: a) machined studs; b) machined bolts, screws and nuts; c) cold formed bolts, screws and nuts with cut or cold formed threads; d) hot formed bolts and screws <1.5 in. (38.1 mm) nominal diameter; e) hot-formed bolts and screws ≥1.5 in. (38.1 mm) nominal diameter; f) roll threaded studs, bolts, and screws <1.5 in. (38.1 mm) diameter; g) roll threaded studs, bolts, and screws ≥1.5 in. (38.1 mm) diameter; h) hot-formed nuts <1.5 in. (38.1 mm) nominal diameter; i) hot-formed nuts ≥1.5 in. (38.1 mm) nominal diameter.