Mul-T-Lock MTL 400 Combo Cylinder, 1-1/8"
The Mul-T-Lock MTL400 Combo Cylinder (1-1/8") is one of the most versatile and advanced cylinders in the field today — and a favorite of ours for clients who want top-tier security with future-ready flexibility. It’s our favorite cylinder for most applications around NYC and we’ve seen it withstand appalling physical attacks. It punches way above its weight!
Designed to work with both rim and mortise lock bodies, this combo cylinder simplifies complex jobs and fits a wide range of hardware without sacrificing strength or control. Whether you’re upgrading a surface-mounted deadbolt or a mortise-style entry lock, the MTL400 adapts — making it ideal for apartments, brownstones, mixed-use buildings, and anywhere hardware needs vary.
Beyond versatility, the MTL400 introduces new layers of protection not available in previous models. Built with Mul-T-Lock’s patented telescopic pin technology, it offers exceptional resistance to drilling, bumping, picking, and unauthorized key duplication. It meets or exceeds today’s high-security standards — while also offering improved key ergonomics and smoother operation. It’s one of the most thoughtfully engineered cylinders we’ve seen in years.
If you’re looking for a lock that’s easy to live with but tough to bypass, the MTL400 is an excellent choice — especially when you need a high-security upgrade across multiple door types.
Includes:
1 MTL400 Combo Cylinder (1-1/8")
Rim and mortise tailpiece hardware set
2+ high-security keys
Key control card (for authorized duplication only)
Optional installation available in NYC
Perfect for:
Mixed hardware setups (rim + mortise)
Brownstones, multi-unit buildings, and rentals
Anyone who wants strong, modern protection with flexibility
Not sure if it’ll fit your door? Reach out — we’re here to make it easy, not overwhelming.
The Mul-T-Lock MTL400 Combo Cylinder (1-1/8") is one of the most versatile and advanced cylinders in the field today — and a favorite of ours for clients who want top-tier security with future-ready flexibility. It’s our favorite cylinder for most applications around NYC and we’ve seen it withstand appalling physical attacks. It punches way above its weight!
Designed to work with both rim and mortise lock bodies, this combo cylinder simplifies complex jobs and fits a wide range of hardware without sacrificing strength or control. Whether you’re upgrading a surface-mounted deadbolt or a mortise-style entry lock, the MTL400 adapts — making it ideal for apartments, brownstones, mixed-use buildings, and anywhere hardware needs vary.
Beyond versatility, the MTL400 introduces new layers of protection not available in previous models. Built with Mul-T-Lock’s patented telescopic pin technology, it offers exceptional resistance to drilling, bumping, picking, and unauthorized key duplication. It meets or exceeds today’s high-security standards — while also offering improved key ergonomics and smoother operation. It’s one of the most thoughtfully engineered cylinders we’ve seen in years.
If you’re looking for a lock that’s easy to live with but tough to bypass, the MTL400 is an excellent choice — especially when you need a high-security upgrade across multiple door types.
Includes:
1 MTL400 Combo Cylinder (1-1/8")
Rim and mortise tailpiece hardware set
2+ high-security keys
Key control card (for authorized duplication only)
Optional installation available in NYC
Perfect for:
Mixed hardware setups (rim + mortise)
Brownstones, multi-unit buildings, and rentals
Anyone who wants strong, modern protection with flexibility
Not sure if it’ll fit your door? Reach out — we’re here to make it easy, not overwhelming.
The Mul-T-Lock MTL400 Combo Cylinder (1-1/8") is one of the most versatile and advanced cylinders in the field today — and a favorite of ours for clients who want top-tier security with future-ready flexibility. It’s our favorite cylinder for most applications around NYC and we’ve seen it withstand appalling physical attacks. It punches way above its weight!
Designed to work with both rim and mortise lock bodies, this combo cylinder simplifies complex jobs and fits a wide range of hardware without sacrificing strength or control. Whether you’re upgrading a surface-mounted deadbolt or a mortise-style entry lock, the MTL400 adapts — making it ideal for apartments, brownstones, mixed-use buildings, and anywhere hardware needs vary.
Beyond versatility, the MTL400 introduces new layers of protection not available in previous models. Built with Mul-T-Lock’s patented telescopic pin technology, it offers exceptional resistance to drilling, bumping, picking, and unauthorized key duplication. It meets or exceeds today’s high-security standards — while also offering improved key ergonomics and smoother operation. It’s one of the most thoughtfully engineered cylinders we’ve seen in years.
If you’re looking for a lock that’s easy to live with but tough to bypass, the MTL400 is an excellent choice — especially when you need a high-security upgrade across multiple door types.
Includes:
1 MTL400 Combo Cylinder (1-1/8")
Rim and mortise tailpiece hardware set
2+ high-security keys
Key control card (for authorized duplication only)
Optional installation available in NYC
Perfect for:
Mixed hardware setups (rim + mortise)
Brownstones, multi-unit buildings, and rentals
Anyone who wants strong, modern protection with flexibility
Not sure if it’ll fit your door? Reach out — we’re here to make it easy, not overwhelming.