Pacific Lock Company (PACLOCK) is an American lock manufacturer that produces medium security padlocks. Their locks generally feature a Universal Cylinder System which allows cylinders to be interchangeable and easy to rekey.
Federal Lock was founded in 1998. The name was changed in 2005 to Pacific Lock Company.  Offering an alternative to the American Lock brand of padlocks, they shifted to American-based manufacturing in 2010. Pacific Lock Company is family owned and headed by president Greg Waugh.
- PACLOCK 90
- PACLOCK 90A
- PACLOCK 95
- PACLOCK 100
- PACLOCK 100A
- Pacific Lock 100G
- PACLOCK 150
- PACLOCK 200
- PACLOCK 200A
- PACLOCK 250
Keys and Cylinders
PACLOCK's 5 & 6-pin cylinders are pinned like American Lock 5 & 6-pin cylinders but the ends are shaped differently to mitigate a well-known American lock bypass. The standard PACLOCK keyway is the "P0" keyway which is the same as the American Lock "AM3" or ILCO 1045 for 5-pin, and "AM7" or ILCO A1045 for 6-pin. Unless otherwise requested, a PACLOCK order comes with the 6-pin "P0" (ILCO 1045/A1045) keyway, though restricted keyways for American Lock AR1, AR2, and AR7 and its own 6-pin "PR1" and "PR2" are also available. Older keyed-alike versions of their PL laminated padlocks were compatible with M1/M10 (4-pin and 5-pin) keys. 
PACLOCK padlocks support several cylinder types. The "standard rekeyable" design matches up to American pin spacing and depths, are compatible with American AM3/AM7 keys, and support repinning without requiring full cylinder disassembly.  PACLOCK padlocks also support SFIC, LFIC, KIK/KIL (Key-in-Knob/Key-in-Lever), and their proprietary UCS (Universal Cylinder System). The "government" cylinder on the 100G padlock has a 5-pin M15 (ILCO 1092R) cylinder 
The UCS Universal Cylinder System is a proprietary interchangeable core system for PACLOCK padlocks, puck locks, cargo locks, etc.  "With UCS™, every padlock can have its own, unique key, all padlocks can share the same key, or a master key can be used to open all locks. Finally, a Grand-Master key allows for a sub-system of Master Keys over your locks." 
The UCS system only uses 6 depths because in a standard 8-depth system key bittings need to be at least 2 depths apart to avoid "key interchange" (keys that work but are not intentionally in the master system, i.e., incidental or ghost keys ), so PACLOCK's slightly larger pins eliminate that issue and allow all 6 depths to be used, allowing a greater number of overall key bittings in a master key system  PACLOCK UCS pins are stainless steel, providing more drill resistance compared to commonly-used brass pins.