Kwikset 660 Deadbolt with SmartKey, Matte Black

The Kwikset 660 deadbolt offers contractors and property managers a Grade 3 single-cylinder lock with SmartKey technology that eliminates locksmith costs for re-keying. At 0.98 pounds and featuring a 1-inch deadbolt throw, it’s the lightweight alternative to Kwikset’s heavier Grade 2 options.

The real value lies in SmartKey Security — re-key the lock in seconds using the included SmartKey tool. No locksmith. No removing the lock. Perfect for rental properties where tenant turnover demands frequent re-keying. The technology pays for itself after dodging just one or two locksmith calls.

Installation and Compatibility Specs

Installation takes 5-15 minutes with just a screwdriver. The adjustable components handle the variations contractors encounter daily:

Specification	Value
Door thickness range	1-3/8” to 1-3/4”
Adjustable backset	2-3/8” or 2-3/4”
Cross bore	2-1/8”
Edge bore	1”
Latch faceplate	Round-corner

The package includes everything needed: exterior deadbolt cylinder, interior thumb turn, adjustable latch, strike plate, 2 keys, SmartKey tool, and mounting screws. Installation steps are straightforward: confirm door dimensions, install adjustable latch, mount exterior cylinder, secure interior thumb turn, then optionally re-key with SmartKey tool.

Grade 3 Security Reality Check

Let’s be honest about what Grade 3 ANSI/BHMA means. It’s lower security than Kwikset’s Grade 2 780/980 series. Reviews note concerns about durability of the SmartKey mechanism under heavy use and the lock’s resistance to forced entry.

Grade 3 is adequate but not the highest level of security available. For most Montana residential applications — especially rental properties where convenience matters more than maximum security — Grade 3 works fine. Remote cabins or high-value properties deserve the Grade 2 upgrade.

The lock does feature pick-resistant and bump-proof technology, which addresses common bypass methods. Reviews average 4.6 stars across 7,900+ ratings, with top complaints focusing on the Grade 3 security level and potential for rust in humid areas.

Montana Installation Considerations

The matte black finish (514) handles UV exposure better than chrome or brass finishes on south-facing doors. The limited lifetime warranty covers both mechanical function and finish — though Montana’s temperature swings test any warranty promise.

ADA compliant interior thumb turn matters for accessible construction. The traditional round design fits standard door prep without modification.

Frequently Asked Questions

Can the 660 be re-keyed to match existing Kwikset locks? Yes. The lock uses Kwikset’s KW1 keyway and includes the SmartKey tool for re-keying. You can match it to any existing Kwikset key in seconds.

What’s the actual installation time for a contractor? 5-15 minutes per lock. The lower estimate assumes pre-drilled doors. Add time for fresh boring on new doors or non-standard installations.

Is Grade 3 sufficient for rental properties? Grade 3 provides adequate security for typical residential use. The SmartKey convenience often outweighs the security trade-off for rental applications where re-keying frequency matters more than maximum forced-entry resistance.

Does the matte black finish hold up in Montana weather? The finish carries a limited lifetime warranty. Some reviews mention potential for rust in humid areas — less concern in Montana’s dry climate than the UV exposure on south-facing installations.