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Segen Quick Change Cylinder Lock Systems

Learn More About

The Segen Series

The Segen Quick-Change products come in a variety of sizes and styles including high strength versions and sensor versions that provide a visual means of identifying that the system has locked.

Micro Sized, Numerous Applications

Model PD250 Micro Cylinder

The PD250 micro cylinder, with a flange diameter of 15/16″ (0.9375″) x 0.060″, and weighing in at a mere 0.13 lbs. (including knob) is a perfect fit for holding smaller tools, logos, mold inserts, dies, jigs and fixtures where the performance requirements are for small envelopes and reduced locking forces.

Engineered for long life with a tested lifespan of over 40,000 cycles, the micro cylinder’s load rating of 500 lbs. provides the precision, accuracy and stability for smaller and lighter load applications. The stainless steel, corrosion resistant micro PD250 cylinder locks are temperature rated from -65 to 450 degrees F.

Both standard and metric thread versions are available along with a variety of high strength, hardened steel knobs. The micro cylinders can be customized for sealed applications in hostile environments. Suitable for in plate mounting utilizing the rear air fitting or enclosed in a housing with a supply manifold, the micro cylinder locks are easily installed using a clever installation tool that fits any standard 1/4″ socket drive.

pd250 micro cylinder
Ease Component Changeover

Model 375 Mini Cylinder Lock

Segen’s Mini Cylinder Locks are precision quick-change devices with the ability to save you time, money and energy. The incredible holding power of 1800 lbs. (static), assures a secure, fail-safe hold…even if pneumatic pressure is lost. Engineered for long life and demanding use, our locks operate in extreme conditions and temperatures up to 450° F. The Model 375 at 1 5/8″ Dia. x 2″ H x 2 3/8″ flange is great for frequently changed components, such as:

  • Logos
  • Tools
  • Tool Parts
  • Mold Inserts
  • Dies
  • Jigs
  • Fixtures
  • Palletizing
  • Material Handling
  • and more...

The 375 is also available in a High-Strength Model, offering up to 5-times the holding force, as well as in a sensor version or higher temperature model, please call for details.

PD375 Products image
Ease Component Changeover

Model 438 Cylinder Lock

Segen’s Model 438 Quick Change Cylinder Locks offer you a change for the better. With a holding force of 2,700 pounds and sized at 4.875″ H x 2.875″ Dia, the 438 was our original Quick Change solution to hit the market and it continues to deliver today. Positively locked in a static state, the Cylinder Lock actuates when air pressure is applied to release or receive the knob. The Cylinder Lock locates and positions the knob to within 0.0002″ with a holding force of 2,700 pounds.

The 438 is also available in a High-Strength version, offering 3.5-times the holding force, as well as in a sensor version.

PD438 products image
Ready to lock even the largest tools

Model 500 Mega-Cylinder Lock

Like our smaller cylinder locks, the Model 500 Mega Cylinder will help accelerate tool change overs and reduce downtime. The lock, designed to receive and mate with a conical male knob, locates and positions the knob to within 0.0002 in. with a holding force up to 25,000 lbs. per device, depending on cylinder specifications. Our Model 500 Cylinder Lock, sized at 5″ H x 4″ Dia. with a flange diameter of 5.75″ will enable you to instantly locate and lock even the largest tools with precision, ease and repeatability.

The Model 500 is also available in High-Strength Model offering up to two times the holding power.

Make even tough changeovers a snap!

Model 390 Snap Fastener

Get instant access to the unreachable! Segen’s Snap Fastener is an easy-to-use, snap-in/snap-out fastening device designed to speed changeovers, increase production and reduce downtime. A smart, time-saving alternative when access to screws is difficult.

Now you can instantly fasten frequently changed tool components, including logo plates, bottom inserts, access plates and more. Simply push and it snaps into place. Removal is just as fast and easy.

Snap Lock Posts Collets


  1. Tooling Technology has no way of testing every possible scenario in which our products could be used. If you are unsure about choosing the right product for your proposed application, please contact us.
  1. The published load ratings for each product are reliant on mating the knobs and cylinders with fasteners that are compatible with those respective loads.
Contact Us

For more Segen Quick Change information, fill out the form or give us a call at: +1 (586) 580-4048