TDS PDF

Round Robin Test Program for Development of Hardness Conversions for Precipitation Hardened Nickel Alloys and Martensitic Stainless Steels. Original standard API TR 21B-2024 in PDF full version. Additional info + preview on request

Document status: Active

Evaluating the Crack Initiation Toughness, Crack Resistance Curves, and Tensile Properties of Two Materials in High-Pressure Hydrogen Gas. Original standard API TR 21C-2025 in PDF full version. Additional info + preview on request

Document status: Active

A Study of the Effect of Thread Forming on the Susceptibility of Precipitation Hardened Ni-Based Alloy Fasteners to Hydrogen Embrittlement. Original standard API TR 21D-2024 in PDF full version. Additional info + preview on request

Document status: Active

Materials Selection for Bolting. Original standard API TR 21TR1-2019 (2020) in PDF full version. Additional info + preview on request

Document status: Active

Materials Selection for Bolting. Original standard API TR 21TR1-2019 (2022) in PDF full version. Additional info + preview on request

Document status: Active

S-N Fatigue Design Guidelines and Test Data for Bolts. Original standard API TR 21TR2-2022 in PDF full version. Additional info + preview on request

Document status: Replaced by St API TR 21TR2-2025