IS 11680 : 2025 ( ISO 4147 : 1997)    

Aerospace - Nuts, Hexagonal, Slotted (Castellated), Normal Height, Normal Across Flats, with MJ Threads, Classification - 600 Mpa (at Ambient Temperature)/120 °C, 600 Mpa (at Ambient Temperature)/235 °C, 900 Mpa (at Ambient Temperature)/425 °C, 1 100 Mpa

Technical Committee : TED 14

Status : Active