Window security pin locks are a simple, affordable way to add extra protection to sliding windows and patio doors without replacing the entire frame hardware.
Below, we break down the best options for 2026 so you can compare fit, materials, and ease of use before you buy.
Best 10 Window Security Pin Locks Picks for 2026
Sliding Window Secondary Lock
Prime-Line 4 Pack Sliding Window Lock
- No-tools installation
- Locks closed or ventilating position
- For metal horizontal sliding windows
Best For: Metal horizontal sliding windows needing a simple secondary lock
Patio Door Pin Security Lock
Hardware Essentials Patio Door Pin Lock
- Adjustable position
- Rust-resistant steel
- Requires drill installation
Best For: Patio doors needing a durable adjustable pin lock
Keyed Sliding Security Stop
4 Sets Keyed Sliding Window Locks
- Fits windows, doors, and vertical doors
- Double-screw mount with rubber cushioning
- Includes four keyed locks
Best For: Sliding windows and doors needing keyed, adjustable security stops
Sliding Patio Door Pin
Prime-Line U 9858 Secondary Lock
- Steel pin with chrome-plated finish
- Includes hardware and instructions
- Secondary lock helps prevent sliding or lifting
Best For: A basic secondary lock for sliding patio doors
Extra-Long Pin Lock Set
- Extra-long 3-1/2 inch pin
- Nickel construction
- No batteries required
Best For: Sliding doors and windows needing a longer pin lock
Sliding Door Pin Lock
Prime-Line S 4066 Retaining Ball
- Steel pin with chrome finish
- Includes holder, fasteners, and instructions
- Securing sliding doors and windows
Best For: A secondary pin lock for sliding doors and windows
Tool-Free Sliding Window Security
Prime-Line U 9802 Aluminum 2-Pack
- Thumbscrew lock installs without tools
- Heavy-duty aluminum with steel thumbscrew
- 2-pack for vertical or horizontal sliders
Best For: Older metal-framed sliding windows that need a simple secondary lock
Pin-Style Sliding Lock Value Pack
Stainless Steel Security Pins 10-Pack
- 10-pack for multiple windows or doors
- Chrome-plated stainless steel build
- Includes mounting hardware
Best For: Securing several sliding windows or doors with one bulk purchase
Secondary Window Pin Lock
Prime-Line U 9857 Chrome Single
- Secondary lock for sliders and patio doors
- Case-hardened steel construction
- Hardware included, single-pack format
Best For: A single sliding window or patio door that needs secondary security
Sliding Window Secondary Lock – Prime-Line 4 Pack Sliding Window Lock
If you want a straightforward option for window security pin locks on metal horizontal sliders, this Prime-Line lock adds a simple secondary barrier without complicating installation. It works in either the fully closed or ventilating position, and the thumb turn screw helps hold the lock in place once set.
Best For: Metal horizontal sliding windows that need an easy secondary lock for closed or ventilating use.
Pros:
- No-tools installation makes it easy to add to compatible windows.
- Supports both fully closed and ventilating positions.
- Extruded aluminum body with steel thumbscrew for durable use.
- 4-pack gives you multiple locks for several windows or backups.
Cons:
- Not universal, so fit must be checked against the line art and rail size.
- Designed for metal horizontal sliding windows, not every window type.
This is a practical pick if you want a basic mechanical lock that focuses on fit, simplicity, and secondary security rather than extra features.
Patio Door Pin Security Lock – Hardware Essentials Patio Door Pin Lock
For shoppers comparing window security pin locks that also work on patio doors, this Hardware Essentials pin offers an adjustable steel option with a straightforward install process. It uses a drilled mount and comes with matching screws and instructions, so it suits users who are comfortable with basic tools.
Best For: Patio doors that need an adjustable steel pin lock installed with simple hardware tools.
Pros:
- Adjusts to help you set the desired position.
- Durable rust-resistant steel construction.
- Includes matching screws and mounting instructions.
- Designed for patio door security use.
Cons:
- Requires marking tools, a drill, drill bits, and a screwdriver.
- Best suited to buyers who are comfortable with installation.
If you want a basic pinned security solution and don’t mind a more involved install, this is a functional choice built around durability and adjustability.
Classic Bronze Thumbscrew Lock – Prime-Line Bronze Sliding Window Lock
This Prime-Line option is a solid fit for buyers looking at window security pin locks for older metal-framed sliders. It works on both horizontal and vertical sliding windows, installs without tools, and can be used to secure a window or hold it in a ventilating position.
Best For: Older metal-framed sliding windows that need a simple secondary lock with no-tool installation.
Pros:
- Compatible with both horizontal and vertical sliding windows.
- No-tools installation keeps setup simple.
- Heavy-duty extruded aluminum with steel thumbscrew.
- Useful for closed or ventilating positions.
Cons:
- Limited to windows with frame fins up to 3/16 inch thick.
- Primarily aimed at older-style metal-framed windows.
It’s a practical secondary lock if your window dimensions match, especially when you want a compact, easy-to-install solution for traditional sliding frames.
Keyed Sliding Security Stop – 4 Sets Keyed Sliding Window Locks
These keyed window security pin locks are aimed at sliding windows, sliding doors, and vertical doors where you want more control over how far a panel can open. The double-screw design, rubber cushioning, and included hex keys make them a more feature-rich choice for homes, offices, and kids’ rooms.
Best For: Sliding windows and doors where keyed control and adjustable limiting are important.
Pros:
- Works with sliding windows, sliding doors, and vertical doors.
- Double-screw mount adds a secure hold on the track.
- Rubber cushioning helps prevent scratches or damage.
- Includes four locks and keys for multiple openings.
Cons:
- Track width must be measured carefully for proper fit.
- Installation still depends on track compatibility.
This set is a strong choice if you want a keyed stop with flexible placement and a bit more control than a basic thumbscrew lock.
Sliding Patio Door Pin – Prime-Line U 9858 Secondary Lock
If you’re comparing window security pin locks for a sliding patio door, this Prime-Line pin is a simple way to add secondary protection. It uses a steel pin and retaining ring design to help prevent sliding or lifting, and the included hardware makes installation straightforward.
Best For: Homeowners who want a basic secondary lock for a sliding patio door.
Pros:
- Steel pin with chrome-plated finish
- Retaining ring design engages when locked
- Includes installation hardware and instructions
- Compact 2-5/8 in. pin length and 3/16 in. diameter
Cons:
- Designed as a secondary lock, not a primary security system
- Single-pack quantity only
This is a practical add-on if you want a straightforward pin lock for extra door security. It’s best suited to users who value a simple, hardware-included solution over more complex locking setups.
Extra-Long Pin Lock Set – Pro 55201 Window Guard
Pro 55201 Window Guard Pin Lock Set for Sliding Doors and Windows - Extra-Long 3-1/2" Pin
Check Price On AmazonFor shoppers looking at window security pin locks for sliding doors and windows, this ProTool set stands out for its extra-long 3-1/2 inch pin. The nickel construction and simple pin-lock format make it a practical option when you want a straightforward guard-style lock without batteries or complicated parts.
Best For: Sliding doors and windows that need an extra-long pin lock setup.
Pros:
- Extra-long 3-1/2 in. pin
- Nickel construction
- No batteries required
- Compact lock set format
Cons:
- Brand details are limited in the supplied notes
- No installation hardware or instructions are mentioned in the notes
This is a simple mechanical choice for people who want a longer pin length in a window or sliding-door guard lock. It keeps the focus on basic function and avoids any powered or smart features.
Sliding Door Pin Lock – Prime-Line S 4066 Retaining Ball
Prime-Line S 4066 Sliding Patio Door Lock Pin, 2-5/8 In., Steel Pin, Chrome Finish (Single Pack)
Check Price On AmazonIf you want window security pin locks that also work for sliding doors, this Prime-Line model is built as a secondary lock with a retaining ball design. It uses a 2-5/8 inch steel pin, includes installation hardware, and is meant to help prevent sliding or lifting of the door.
Best For: Users who need a secondary pin lock for sliding doors and windows.
Pros:
- Steel pin with chrome finish
- Retaining ball/pin lock design
- Includes holder, fasteners, and instructions
- Listed for securing sliding doors and windows
Cons:
- Single-pack only
- Secondary lock, not a standalone primary lock
This is a sensible pick if you want a simple mechanical lock with installation parts included. Its sliding-door-and-window compatibility makes it the most flexible option in this group.
Tool-Free Sliding Window Security – Prime-Line U 9802 Aluminum 2-Pack
Prime-Line U 9802 Extruded Aluminum Sliding Window Lock, 1/4 Inch, White, 2 Pack
Check Price On AmazonIf you need window security pin locks for older metal-framed sliders, this Prime-Line option is a straightforward add-on. It uses a thumbscrew design for tool-free adjustment and is meant to help secure both vertical and horizontal sliding windows.
Best For: Metal-framed sliding windows where you want a simple secondary lock without complicated installation.
Pros:
- Tool-free thumbscrew design makes adjustment quick and simple
- Heavy-duty extruded aluminum body with steel thumbscrew for durability
- Works with both vertical and horizontal sliding windows
- Comes in a 2-pack for securing more than one window
Cons:
- Only fits metal window frames with fins up to 3/16 inch thick
- Designed for older-style metal-framed windows, not every modern frame
This is a practical pick if your main goal is a simple supplementary lock for compatible sliding windows. Just verify your frame thickness first, since fit is the key limitation here.
Pin-Style Sliding Lock Value Pack – Stainless Steel Security Pins 10-Pack
For shoppers comparing window security pin locks in bulk, this stainless steel 10-pack is built around a simple pin-and-chain style design. Each lock includes mounting hardware and is intended for sliding windows or sliding doors where a basic physical security stop is needed.
Best For: Buying multiple pin locks at once for several sliding windows or doors.
Pros:
- Ten-pack offers coverage for multiple openings
- Chrome-plated stainless steel construction
- Includes mounting hardware for installation
- Suitable for sliding windows and sliding doors
Cons:
- Product details provide limited fit and sizing guidance
- No installation complexity details beyond included hardware
This is a practical choice if you want a straightforward pin lock in quantity rather than a single premium unit. The biggest advantage is the multi-pack format, but you should confirm the dimensions work for your specific setup before ordering.
Secondary Window Pin Lock – Prime-Line U 9857 Chrome Single
This Prime-Line model is a classic example of window security pin locks used as a secondary lock on sliding windows and patio doors. It is designed to hold the window or door closed, or in a ventilating position, while helping prevent sliding or lifting.
Best For: Adding a simple secondary lock to a sliding window or patio door.
Pros:
- Works as a secondary lock for sliding windows and patio doors
- Can secure the closed or ventilating position
- Case-hardened steel construction for durability
- Mounting hardware is included for installation
Cons:
- Single-pack format may not suit multiple openings
- Requires a Phillips head screwdriver for installation
If you want a compact, no-frills pin lock for one opening, this is a solid utility pick. Its strength is simple secondary security, but make sure the 1-5/16 inch size matches your application.
How We Picked the Best Window Security Pin Locks
We focused on Window Security Pin Locks that cover the most common real-world needs: secure fit, straightforward installation, durable materials, and compatibility with sliding windows or patio doors. We also favored options that offer practical sizing choices, since pin length and lock style can make or break the fit.
Quick Comparison
In this group, the biggest differences come down to pin length, finish, mounting style, and whether you want a single lock, multi-pack, or keyed set. Shorter pins are often best for standard sliding windows, while longer pins are better when the frame or door track needs extra reach. Multi-packs can be a better value for whole-home coverage.
Key Buying Factors for Window Security Pin Locks
Pin Length and Fit
Measure the track or frame before ordering. A pin that is too short may not engage fully, while one that is too long can interfere with operation. This is the most important spec to check for Window Security Pin Locks.
Material and Finish
Steel and aluminum are both common. Steel tends to offer a sturdier feel, while aluminum can be lighter and corrosion-resistant. Chrome, bronze, and painted finishes matter mostly for appearance, but they can also help the lock blend with existing hardware.
Ease of Installation
Many models install with simple hand tightening or basic tools. If you want a temporary or renter-friendly option, look for designs that are easy to remove and reset. Keyed sets may offer extra control, but they are not always necessary for basic security.
Window and Door Compatibility
Some locks are designed specifically for sliding windows, while others also work on patio doors. Check whether the product is intended for vertical or horizontal sliding applications, and confirm track dimensions before purchasing.
Who Should Buy Which Window Security Pin Locks?
If you want a low-cost upgrade for a few windows, a basic single-pack or two-pack may be enough. If you are securing multiple rooms, a multi-pack or set can save money and simplify installation. For patio doors or wider openings, choose a longer pin model with verified compatibility. If appearance matters, match the finish to your existing hardware for a cleaner look.
Overall, the best Window Security Pin Locks are the ones that match your track size, installation preference, and security goals without overcomplicating the setup.