![]() Returning to zero requires the third digit be entered precisely for the lock to open.). Once the first two digits are dialed, the last number can be determined by trying every number until one opens the lock. (Virtually all three number combination lock that does not require returning to zero after the combination is dialed is really only as secure as a two number combination. Finally, turn clockwise and stop at zero. Turn counterclockwise again and stop at your third number on your 2nd time passing it. ![]() Turn clockwise and stop on your second number when passing it the 3rd time. To open the lock, turn counterclockwise and stop at the first digit of your combination on the 4th time passing it. ![]() It opens using a left-right-left-right pattern. This lock uses a 3 number combination followed by a return to zero. The primary goal of the 8077 combination padlock is to ensure that if someone gets through the lock you know it. The shackle is not extremely thick on the lock meaning it is able to fit many applications but with large enough bolt cutters it can be cut. The combination lock operates virtually identically to a standard safe combination lock and uses similar security and inner workings. It is primarily used by the government and government contractors due to its high security nature. The S&G 8077 Combination Padlock is one of the only secure combination padlocks we have been able to find. Many standard combination padlocks give away the third number making even the worst case of brute forcing a two number combination fairly easy. Many can be shimmed open using a coke can (or similar) and most common branded ones can also be easily decoded using simple online guides. Most combination padlocks are extremely vulnerable to surreptitious attack. Below are the technical details (exact measurements given in mm): There are 125,000 possible combinations and the combination can be reset with a change key. It has unique serial numbers on three different parts to ensure that critical parts are not broken to gain entry and then replaced. The 8077 is designed to show obvious evidence of any forced entry attempt. This padlock is especially well suited for file cabinet locking bars. Sargent & Greenleaf 8077 Combination Padlock
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