Best 1A1DD1KS473KS800 Key Blank DD Keyway "Duplication Prohibited" - Box of 50

The BEST 1A1DD1KS473KS800 is a standard 6-pin key blank for the BEST DD keyway, stamped "Duplication Prohibited" and sold in a box of 50. A key blank is the uncut key that a locksmith cuts to a specific bitting to operate a lock, and this one is made for BEST's 1A small format interchangeable core (SFIC) system in the DD keyway. The DD keyway is one of the keyway sections in the BEST 1A family, so this blank only fits and cuts for DD-keyed BEST cores, which is what keeps different keyways in a master key system from operating each other. Each blank carries the "Duplication Prohibited" stamp and has a blank back.

What the DD keyway and 1A series mean

This is worth understanding before ordering, because BEST key blanks are keyway-specific. BEST's 1A series is its standard small format interchangeable core key system, and within it the keys are divided into keyway sections, A, B, C, D, DD, E, F, G, and so on. Each section has a slightly different groove profile milled into the key blade, so a blank from one section won't enter a core cut for another. The DD keyway is one of those sections. This blank is the DD section blank, so it's the correct uncut key for cutting duplicate or additional keys for locks and cores keyed to the BEST 1A DD keyway.

Getting the keyway right is the whole job with key blanks. ADD blank cuts keys only for DD cores, ordering the wrong keyway section gives you blanks that won't fit your locks, which is the most common mistake when buying BEST blanks.

The "Duplication Prohibited" stamp

This blank is stamped "Duplication Prohibited" on the bow (the head of the key). That stamp is a visual deterrent: it tells anyone (including a copy kiosk or hardware-store key machine) that the key is not to be copied without authorization, which supports key control in a facility. The KS473 designation in the part number is the "Duplication Prohibited" stamp variant (BEST also offers a "Best Duplication Prohibited" stamp under KS208). The back of this blank is blank, leaving room for your own facility stamping or coding if you mark keys for a system.

BEST 1A1DD1KS473KS800 specifications

• Type: Standard 6-pin key blank for BEST 1A small format interchangeable core (SFIC) system.

• Keyway: DD keyway (BEST 1A keyway section).

• Stamping: "Duplication Prohibited" on the bow. Back is blank.

• Quantity: Box of 50 blanks.

• Part number: 1A1DD1KS473KS800.

• Use: Cutting duplicate or additional keys for BEST DD-keyed cores and locks.

Why choose the genuine BEST 1A1DD1KS473KS800

For a facility running a BEST 1A key system in the DD keyway, genuine BEST blanks are the reliable choice for cutting keys that fit and turn correctly the first time. You get authentic BEST brass blanks in the correct DD keyway section, the "Duplication Prohibited" stamp for key control, and a 50-count box that covers ongoing key cutting for a system. Buying the matched keyway in bulk is the efficient way to keep a locksmith shop or facilities department stocked for the BEST cores already in the building.

One thing to confirm before ordering: this is the DD keyway blank. Verify your BEST cores are keyed to the DD section before ordering (a different keyway is a different blank), and choose the stamp variant you want, "Duplication Prohibited" (KS473, this one) or "Best Duplication Prohibited" (KS208).

Order the BEST 1A1DD1KS473KS800 from American Locksets

We stock the full BEST key blank line from authorized distribution, so every blank is genuine BEST. Compare keyway sections and stamps in the BEST key blanks category, or browse all IC housings and cores.