The court, presided by First Additional Sessions Judge Hridyesh, also imposed a fine of Rs 1 lakh each on the four convicts.
The Judge, however, acquitted seven other accused for lack of evidence against them.
The explosives loaded in trucks from Dholpur-based Rajasthan Explosives & Chemical Ltd Company (RECL) and to be delivered to a company near here had gone missing en route to its destination. The consignment was meant for Ganesh Explosives, based at Saderi village.
The court found Shivcharan, Deepa, Aaswani and Thakur guilty under IPC sections 468 (forgery for the purpose of cheating) and relevant sections of Explosives Act, 1984, it said.
The judge awarded a total eight-year jail term each to the four under IPC and Explosives Act. All the sentences will run concurrently, the prosecution said.