BS EN 4122:2018 Aerospace series. Shank nuts, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread. Classification: 1 100 MPa (at ambient temperature) / 650 $0DC

Silver
Dimensions
Nuts
Fasteners
Marking
Heat-resistant materials
Metal coatings
Aircraft components
Locknuts
Threaded fasteners
Surface treatment
Steels
Designations

Link: BS EN 4122:2018 Aerospace series. Shank nuts, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread. Classification: 1 100 MPa (at ambient temperature) / 650 {$permalink}DC
Source: BSI Standards

BS EN IEC 62485-2:2018 Safety requirements for secondary batteries and battery installations Stationary batteries

Inspection
Electrical safety
Protected electrical equipment
Electric power systems
Electric cells
Safety measures
Hazards
Nickel-cadmium batteries
Direct energy conversion
Storage batteries
Alkaline batteries
Maintenance
Voltage
Lead-acid batteries

Link: BS EN IEC 62485-2:2018 Safety requirements for secondary batteries and battery installations Stationary batteries
Source: BSI Standards