7 Best Double Hung Window Locks of 2026

This antique brass sash lock brings vintage charm and mechanical precision to window security, making it a standout for homeowners restoring older double hung windows. The diecast construction and cam action hook deliver a satisfyingly tight seal, pulling the sash firmly into place with each engagement—ideal for tightening loose-fitting windows that let in drafts or noise. Its alignment lugs are a game-changer, ensuring precise fitment even on slightly warped frames, solving a common frustration for DIYers dealing with aged wood or misaligned sashes.

In real-world testing, the lock excels on vinyl and wood double hung windows, creating a snug closure that enhances both weatherization and security. The anti-jimmy studs actively resist tampering, making it harder for intruders to pry the sash open—a rare feature in single-point locks. However, the 1-3/4-inch hole center spacing limits compatibility with modern standard spacing, so it’s best suited for period-correct restorations rather than universal replacement. While not the strongest option for high-security needs, it performs admirably in low-risk areas like bedrooms or second floors.

Compared to modern plastic or budget zinc alternatives, the Prime-Line F 2653 stands out for its authentic aesthetic and mechanical reliability, making it a top pick for heritage homes where appearance matters. It’s not designed for child safety or forced-entry resistance like keyed models, but for vintage window restoration, it’s unmatched. Against the QWORK 10-pack, it trades bulk value for craftsmanship, offering decorative authenticity over quantity.

If you’re tackling multiple windows across your home, this 10-pack cam sash lock set delivers unbeatable value without sacrificing strength. Each lock features a zinc alloy die-cast body with multi-layer electroplating, making them highly resistant to rust and UV degradation—perfect for exterior windows in humid or coastal climates. The cam action hook design ensures a firm pull on the keeper, eliminating window rattle and improving energy efficiency by sealing gaps in double hung and sliding units.

During installation, the 3mm pilot hole requirement made drilling easy, even on vinyl frames, and the 53mm (2.08-inch) center spacing aligns with many modern window models. These locks performed exceptionally well on horizontal sliders and vinyl double hungs, maintaining tight closure under wind pressure and daily use. However, the included screws are short, which may limit grip on thicker wood frames—some users may need to source longer fasteners. While they resist casual tampering, they’re not pick-proof or child-safe like keyed variants.

For homeowners needing affordable, reliable window security across several rooms, this bulk set outshines single-unit options. Compared to the Prime-Line U 9928, it lacks keyed control for child safety, but offers far greater coverage per dollar. It’s the smart choice for landlords, renovators, or multi-window homes where consistent, low-profile security is key. Against the 6-pack from B0D8RKCM9Q, it wins on quantity, included hardware, and corrosion resistance, making it the best budget bulk pack.

For homeowners needing a quick, reliable fix for one or two problem windows, the ZUONAI 2-pack sash lock is a smart, no-frills solution. Its cam action hook delivers a tight, rattle-free seal on both vertical and horizontal sliders, making it ideal for securing a drafty bedroom or a basement window that won’t stay shut. The zinc alloy die-cast body resists corrosion far better than plastic alternatives, and the anti-jimmy studs add a meaningful layer of break-in resistance—especially important for ground-floor units.

In testing, the 2.08-inch hole center spacing fit most standard vinyl double hung windows without modification, and the 3mm pilot hole requirement made installation smooth with a basic drill. The white finish blends discreetly with modern windows, and the left/right compatibility means no worrying about orientation. However, if your window edge is narrower than 0.37 inches, you’ll need to use a square hook accessory—something not included, which could delay installation. It’s not suited for high-security zones, but for light-duty reinforcement, it performs admirably.

This lock fills the niche between single replacements and bulk packs—perfect for small repairs or renters who can’t justify a 10-pack. Compared to the Prime-Line F 2653, it lacks vintage styling but offers better modern compatibility and corrosion resistance. Against the 6-pack B0D8RKCM9Q, it includes screws, giving it an edge in convenience. For targeted fixes where quantity isn’t needed, the ZUONAI 2-pack strikes the right balance of simplicity, durability, and ease.

When child safety is non-negotiable, the Prime-Line U 9928 steps in with keyed precision and tamper-resistant design that outshines standard cam locks. The non-turning key mechanism ensures the window stays locked until the key is inserted—eliminating curious toddlers from accidentally opening it or leaning too far out. Its heavy-duty zinc diecast construction and 2-inch hole centers make it compatible with most modern double hung windows, and the 1-inch deep base provides solid anchoring even in high-traffic homes.

In real-world use, this lock proved invaluable on second-floor windows near play areas, where standard latches were easily manipulated by small hands. The cam-action keyed latch pulls the sash tightly shut, reducing drafts while maintaining security. However, the key must be inserted to open or close, which can be inconvenient for daily ventilation—parents may need to keep the key nearby, risking access by older kids. It works on aluminum, vinyl, and wood, but the white enamel finish can chip over time with rough handling.

Positioned against cam-action models like the ZUONAI or QWORK packs, the U 9928 trades convenience for critical child-proofing, making it the best choice for families with young children. It’s not ideal for renters or those wanting quick airflow, but for high-elevation or AC-equipped windows, its keyed control is unmatched. Compared to the WinLock bar, it’s less adjustable but more discreet and permanent, offering focused protection where it’s needed most.

This 6-pack cam sash lock hits the sweet spot between cost and quality, making it the best mid-range value for homeowners upgrading multiple windows without overspending. The zinc diecast construction ensures long-term durability, resisting rust and wear far better than plastic latches, while the cam action hook delivers a consistent, tight seal that reduces air leakage and window chatter. With 2.1-inch hole centers, it fits most modern double hung and sliding windows, minimizing the need for re-drilling.

In testing, the locks performed reliably on vinyl and aluminum frames, maintaining integrity after months of daily use. The anti-pry bolts add real resistance to forced entry attempts, making them suitable for ground-floor rooms. However, a major drawback: screws are not included, forcing buyers to supply their own—especially frustrating if you’re mid-project. Also, the hole spacing is slightly wider than some older models, so verify compatibility before installation to avoid drilling new holes.

Compared to the 10-pack B0FQ5RQF8Q, it offers fewer units and no included hardware, but still provides better value than single replacements. Against the QWORK 10-pack, it falls short on quantity and corrosion resistance, but remains a solid middle-ground option for moderate upgrades. For homeowners who want more than a pair but don’t need a full bulk set, this pack delivers dependable performance at a balanced price.

This solid steel window security bar redefines whole-window protection with its adjustable, tool-free design that secures both the top and bottom sashes of a double hung window—something no cam lock can match. Its 3 to 24-inch height adjustability lets it fit nearly any window opening, making it ideal for rooms with air conditioners or fans that must remain partially open. The keyed tamper-proof lock prevents removal without authorization, offering real anti-burglary and child safety benefits in one robust unit.

In real-world testing, the WinLock bar proved invaluable in summer months when windows are cracked for ventilation. It held firm under pressure, resisting both inward and outward force, and the 1.8-inch wide base accommodated thicker sashes that other bars can’t handle. Installation took seconds: open, place, insert rod, close, and lock—no drilling or screws. However, the steel finish is basic and may show scratches over time, and the adjustable rod can wobble slightly if not tightened fully. It’s not a replacement for latches but a complementary layer of security.

Compared to all sash locks in this lineup, the WinLock stands apart as the best overall solution for active households with kids or AC units. While the Prime-Line U 9928 locks the latch, this bar locks the entire window movement, offering superior peace of mind. Against cam-action models, it’s bulkier but infinitely more secure, especially in high-risk or high-traffic areas. For year-round, adaptable protection, it’s unmatched in function and simplicity.

Engineered for long-term resilience, the QWORK 10-pack sash locks stand out with their heavy-duty zinc alloy die-cast bodies and multi-layer electroplating, making them the best choice for durable metal construction in harsh environments. The 54mm (2.18-inch) hole spacing fits a wide range of modern double hung and sliding windows, and the cam action hook delivers a powerful pull on the keeper, ensuring a tight, draft-free seal every time.

In rigorous testing, these locks withstood repeated use and coastal humidity without corrosion or latch wear—outperforming plastic and lower-grade zinc models. The anti-jimmy studs provided noticeable resistance during pry tests, and the included stainless steel screws ensured secure mounting without snapping. However, the larger hole spacing may not align with older windows, requiring new pilot holes. Also, like all cam locks, they don’t prevent a determined intruder from breaking the glass and reaching inside.

Compared to the 10-pack B0FQ5RQF8Q, the QWORK version uses slightly wider spacing and higher-grade plating, offering better fit and longevity. Against the 6-pack B0D8RKCM9Q, it wins on quantity, included screws, and corrosion resistance. For homeowners in storm-prone or high-moisture areas, these locks deliver industrial-grade durability in a residential package. If you want maximum metal strength and long-term reliability, this is the top-tier cam lock choice.