BS ISO 6336-2:2019 Calculation of load capacity of spur and helical gears Calculation of surface durability (pitting)

Spur gears
Durability
Lubrication
Gear drives
Load capacity
Mechanical transmission systems
Helical gears
Stress analysis
Surface defects
Design calculations
Mathematical calculations
Formulae (mathematics)

Link: BS ISO 6336-2:2019 Calculation of load capacity of spur and helical gears Calculation of surface durability (pitting)
Source: BSI Standards

BS 3A 210:2019 Aerospace series. Nuts, hexagonal, ordinary and thin, Unified threads (below .250 inch) in brass, tin plated. Specification

Size
Brass
Threaded fasteners
Fasteners
Threaded components
Aircraft components
Designations
Protective coatings
Dimensions
Hexagonal-head fasteners
Internal-thread fasteners
Nuts
Unified screw threads
Air transport engineering

Link: BS 3A 210:2019 Aerospace series. Nuts, hexagonal, ordinary and thin, Unified threads (below .250 inch) in brass, tin plated. Specification
Source: BSI Standards