Keys and Key Accessories

Before you buy a single lock, decide how you’ll key the building. That’s the part most people get backward. Choosing and managing keys and accessories requires planning before purchasing door hardware. Get the keying strategy right up front and you’ll save yourself years of locksmith calls. Get it wrong and you’ll be fighting your own buildings every tenant turnover.

For broader project planning, explore WBC’s building materials resources.

This guide is for the folks doing the real work — landlords, property managers, contractors, and serious DIYers keying homes, rentals, shops, and small commercial buildings. Plus the walk-in customer who just needs a key cut and a decent ring to hang it on.

Keyways, Cylinders, and Why the Planning Comes First

A keyway is the shaped slot in the cylinder. It only accepts a key with the matching groove pattern. Simple idea, big consequences. A project cylinder is a lock mechanism selected for a specific site, often organized into a master key system to provide tiered access. So the first move isn’t shopping — it’s looking. Builders should evaluate the building layout, door types, and security needs to determine the appropriate system.

The keyway choice is where security lives or dies. Standard residential profiles, such as Schlage SC1 or Kwikset KW1, are inexpensive and easy to duplicate but offer low security against unauthorized copying. Fine for a single-family home. A problem for a building where you don’t want a former tenant walking into a hardware store and cutting a copy. For those jobs, go restricted. For commercial or high-security applications, use restricted or patented keyways, which prevent unauthorized duplication by limiting key blank distribution to authorized owners.

Now the cylinder format. Common cylinder formats include Euro profile, American mortise, and Small Format Interchangeable Cores (SFIC). For anything with turnover, SFIC earns its keep. SFIC systems are highly recommended for high-turnover properties because they allow rapid rekeying by swapping the inner core with a control key in seconds without removing the lock body. That’s the whole pitch right there. Tenant moves out, you swap the core in seconds, the next tenant gets a fresh key. No locksmith. No pulling the lock body. Across Montana’s college and resort towns, where rentals flip constantly, that speed adds up fast.

Worth a note for the smart-lock crowd: a mechanical key override still has a keyway, and that keyway is still a security consideration. Don’t let the electronics distract you from the cylinder behind them.

Master Key Systems — Plan the Hierarchy, Don’t Wing It

If your building needs tiered access — staff opens some doors, a master opens all — you need a hierarchy designed before the hardware ships. To manage access, design a door schedule grouping areas by usage zone. Map who needs into what, group the doors, then order.

Here’s the rule that keeps systems secure and expandable: limit master key hierarchy levels to four or fewer to maintain mechanical integrity and security. Every level you stack on adds shear positions inside each lock, and that chips away at pick resistance across the whole system. Keep it lean.

Then document everything. Document all key quantities, assignments, and emergency access policies early in the project to prevent management confusion. Keep that bitting schedule somewhere off-site and update it every time a key gets added, changed, or retired. A master system you can’t track is a master system you’ve already lost control of.

Buying decision	Standard keyway	Restricted/patented keyway
Examples	Schlage SC1, Kwikset KW1	Limited to authorized owners
Duplication	Easy, inexpensive at most hardware stores	Ordered through an authorized dealer
Security against copying	Low	High — controlled blank distribution
Best fit	Single-family homes	Commercial, multifamily, high-security

Buying Key Blanks

Two practical rules here. First, buy in volume if you’re cutting a lot. High-volume builders should prioritize purchasing key blanks in bulk 250-bin packs to reduce costs. Second, precision matters most on master systems. Use original manufacturer blanks for master-keyed systems to ensure precision and reliability. A sloppy aftermarket blank in a master system can bind, fail to turn, or wear the lock. Not the place to cut corners.

For everyday duplication, standard keyways get cut at most hardware stores quickly and cheaply, while restricted keyways have to come through an authorized dealer. Plan accordingly.

Key Accessories and Everyday Carry

This is the walk-in side of the category — rings, tags, hiders, and organizers. Western Building Center’s accessory lineup covers the basics. Split rings come in a wide range of diameters, from 1/2-inch and 5/8-inch on up through 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8, and 1-1/2-inch. For labeling, there are key identifiers in four-packs, ID key tags with swivels, and 25-count colored key tags in 1-1/4-inch — handy when you’re managing a ring full of near-identical keys across multiple units.

For tougher carry, the S-Biner stainless and black key rings (sizes #2 through #4) give you a clip-style hold. There are pull-apart key rings for splitting off a single key, clip-on key backs, and a jumbo key pouch. And for the property owner who wants a backup outside, both rock-style and magnetic key hiders show up in the lineup.

On the organizer end, compact stacking systems are built to do real work. The Key Organizer Pro allows you to store and access your keys with even more ease than before, carrying 3 to 9 standard keys with car keys and fobs on the fixed D-ring. The hardware on those is built to last — LWG-certified Napa leather and 316L stainless steel, with tool-free micro-adjustable hardware so adding or removing keys is simple, with a satisfying click to guide you.

Frequently Asked Questions

What’s the difference between a standard and a restricted keyway? A standard keyway uses common blanks like Schlage SC1 or Kwikset KW1 that are inexpensive and easy to duplicate at most hardware stores — convenient, but offering little protection against someone making unauthorized copies. A restricted or patented keyway limits blank distribution to authorized owners, which prevents unauthorized duplication. Standard works fine for a single home; restricted is the call for commercial and multifamily buildings.

Why do property managers prefer SFIC cores? Small Format Interchangeable Cores let you swap the inner core with a control key in seconds, without removing the lock body. For high-turnover rentals, that means rekeying between tenants on your own, no locksmith required. The lock stays on the door; only the core changes.

How many levels should a master key system have? Keep it to four levels or fewer. Each level you add introduces more shear positions inside every lock, which reduces the pick resistance of the entire system. Map your doors by usage zone first, then build the smallest hierarchy that does the job.

Should I buy original or aftermarket key blanks? For master-keyed systems, use original manufacturer blanks — the precision and reliability matter, and a poorly cut blank can bind or fail in a keyed system. For high-volume general duplication, buying blanks in 250-bin packs lowers your cost per key.

Does a smart lock still have a keyway to worry about? Yes. A smart lock with a mechanical key override still has a physical keyway, and that keyway remains a security consideration. Don’t assume the electronics make the cylinder irrelevant.