Patented Chain Locking System for 8-10mm Chain

PACLOCK’s Universal Cylinder System™ (UCS™) gives you total flexibility — choose Keyed Alike (all your locks open with the same key) or Keyed Different (each lock has its own unique key). With our U-PICK!™ option, you can even choose your own key number when ordering keyed alike, or let PACLOCK assign one for you — either way, you get total control and simplicity.

UCS™ works across a wide range of lock types — from padlocks to trailer locks to job box locks — all using the same key system. It’s the best choice for new PACLOCK customers who want simplicity, scalability, and control, with over 20,000+ unique key changes, a high-performance 6-pin cylinder with stainless steel pins, and tight ±0.002” tolerances that help reduce shimming risk and resist picking and bumping.

Standard Rekeyable (SR) is PACLOCK’s original rekeyable system, designed for simpler PACLOCK-only setups. It uses a 6-pin cylinder with 8 pin heights and stainless steel pins, with a key range of 93001–95802 (up to 4,000 key changes). For expanded systems or new purchases, UCS™ is the recommended path. If you’re currently using SR and want to transition, contact PACLOCK to upgrade your system.

Yes — PACLOCK supports a wide range of third-party cylinder technologies, so you can integrate our padlocks into your existing key system. We manufacture padlocks designed to accept commercial formats including Master Lock® M1, Key-in-Knob/Lever (KIK/KIL), SFIC (5-, 6-, and 7-pin), FSIC, and LFIC systems (Medeco®, Sargent®, Corbin Russwin®, ASSA®, Yale®, and more).

These cylinder technologies are reflected directly in the part number. For example, an 81-Series trailer door lock configured for a Master Lock® M1 cylinder would be M1-81A.

PACLOCK does not supply commercial cylinders — padlocks ship less cylinder, ready to be installed with your existing cores and keys.

Yes — PACLOCK provides master keying and grand master keying solutions for customers who need layered access control. These systems are built to order, so reach out and we’ll walk you through what’s possible for your organization. Lead times may vary depending on system complexity.

You’ve got options:

1. Buy from your local locksmith
   Many locksmiths stock PACLOCK or can order our products for you — supporting local professionals helps you get fast, personalized service.
2. If you are a locksmith or professional, contact your preferred distributor and demand PACLOCK.
   PACLOCK is available through top security distributors across the country.
3. Shop on Amazon
   Our full range of consumer and commercial-grade padlocks is available with Prime shipping.
4. Order directly from PACLOCK.com
   Browse all models, customize your keying, and get direct-from-the-factory options.
5. Need a custom setup, government quote, or commercial account?
   Contact us directly and we’ll route you to the right team — no pressure, no upsells.

Whether you’re placing an order, setting up a key system, or just need help choosing a lock, our team is ready to assist. Use the contact form below, email us at sales@paclock.com, or call 661-294-3707. You’ll hear back from a real person — not a robot.