Sliding Shackle
Sliding Shackle padlocks, or "block locks" as they are sometimes called, are robust in design and are highly resistant to both saw and bolt cutter attacks making them a popular choice for gates, shutters and large hasps & staples.
Closed Shackle, Concealed and Discus padlocks are all highly resistant to saw and bolt cutter attack and may be better suited to you application.
