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Products
Rotary Motion Control
All Rotary Motion Control
Rotary Indexers
Rotary Indexers
Roller Pinion Gears
Geared Bearings
Gears
Precision Brakes
Ball Screw Brakes
Shaft Brakes
Servomotor Brakes
Electric Servomotor Brake
Gearheads
Gearheads
Rotary Motion Control
Rotary Motion Control including Rotary Indexers, Roller Pinion Gears, Precision Brakes and Harmonic Gearheads.
Rotary Indexers
Based on Nexen’s innovative Roller Pinion technology, Nexen Ring Drive (Compact Precision Ring Drive and Precision Ring Drive) systems come complete with a precision grade bearing and drive mechanism in a rigid housing to simplify the selection process. With all the features of our other advanced Roller Pinion System technology, Nexen's Ring Drives open up new design possibilities for the next generation of machines.
Rotary Indexers
Based on Nexen’s innovative Roller Pinion technology, Nexen Ring Drive (Compact Precision Ring Drive and Precision Ring Drive) systems come complete with a precision grade bearing and drive mechanism in a rigid housing to simplify the selection process. With all the features of our other advanced Roller Pinion System technology, Nexen's Ring Drives open up new design possibilities for the next generation of machines.
Rotary Indexers
Based on Nexen’s innovative Roller Pinion technology, Nexen Rotary Indexer Systems come complete with a precision grade, high capacity bearing and drive mechanism in a rigid housing.

With options for high speed, high torque and zero backlash, Nexen Ring Drives can be optimized for every application. With accelerations up to twice as high as other indexing technologies, Nexen Ring Drive systems provide more productivity while boasting low maintenance, high efficiency and long life.
Roller Pinion Gears
Nexen’s patented rack and roller pinion design maintain high repeatable accuracy with zero backlash over longer distances with quieter operation - even at high speeds.
Geared Bearings
Nexen Group's Geared Bearing solution is ready to be integrated into a machine with its full ring gear and a high-capacity cross-roller bearing.

Based on Nexen Group's innovative Roller Pinion technology, the Roller Pinion System Geared Bearings come complete with a precision zero backlash gear mounted on a precision grade, high capacity bearing. Geared Bearings can be incorporated into any precision rotary motion control application with a number of possible sizes and gear ratios, all with zero backlash.
Gears
Nexen Group's Roller Pinion Gear System is based on an innovative pinion consisting of bearing-supported rollers and a unique tooth profile. Gears, Gear segments and geared bearings can be configured to meet the application needs.

This unique drive system provides high positional accuracy, Zero Backlash, no cumulative error, low-velocity ripple, high speeds, rigidity, low noise, low maintenance, corrosion resistance, and long life. This opens up new machine design possibilities and provides the capability to achieve much higher performance levels.
Precision Brakes
Nexen’s Ball Screw / Shaft Brake / Servomotor Brake is a high-torque, spring-engaged, air-released brake. It serves as a redundant safety brake in the event of a mechanical defect in the drive line, particularly in the Z-axis. These brakes provide high accuracy for holding the position in power-off situations.
Ball Screw Brakes
Nexen Group's Ball Screw Brake is a high-torque, spring-engaged brake acting on the machined end of a ball screw. It serves as a primary or redundant safety brake to prevent back driving if a power loss or mechanical defect occurs in the driveline.
Shaft Brakes
Nexen Group's Shaft Brake has several bore sizes available, offering an off-the-shelf, Zero Backlash braking solution for shaft-holding applications. These spring-engaged, air-released brakes offer outstanding holding for consistent, long-lasting performance.
Servomotor Brakes
Nexen Group's Eclipse® spring-engaged, air-released servomotor brakes offer a powerful, high-torque, and no-slip holding option. The Eclipse Servomotor brake is installed between the motor and the linear device, providing improved safety with low inertia.
Electric Servomotor Brake
The Evolve Electric Servomotor Brake is spring engaged, electrically released, and easily configured to match the servo/stepper motor and gearhead mating interfaces. Engineered with Zero Backlash and double-sided friction interface for increased torque capacity, this brake offers a solution for the most demanding applications.
Gearheads
Nexen Groups's Harmonic Gearhead is the perfect combination of size and precision. When combined with Nexen Group's Poller Pinion System, a true backlash-free solution from the motor to the driven load can be achieved. Machine designers will have up to a 70% reduction in length over standard gearheads, gaining increased space in a design.
Gearheads
Nexen Groups's Harmonic Gearhead is the perfect combination of size and precision. When combined with Nexen Group's Poller Pinion System, a true backlash-free solution from the motor to the driven load can be achieved. Machine designers will have up to a 70% reduction in length over standard gearheads, gaining increased space in a design.
Gearheads
Harmonic Gearheads offer true Zero Backlash, high reduction ratios of 50/80/100/120:1, and high load capacity in a very compact package. Gearheads utilize the best cross-roller-bearing technology for the highest rigidity and load capacities.
Linear Motion Control
All Linear Motion Control
Roller Pinion Racks
Roller Pinion Racks
Linear Precision Brakes
Profile Rail Brakes
Rod Locks
Roller Pinion Racks
Nexen Group's Roller Pinion System (RPS) patented rack and roller pinion design maintains high repeatable accuracy with Zero Backlash over longer distances with quieter operation - even at high speeds.
Roller Pinion Racks
Nexen Group's Roller Pinion System (RPS) patented rack and roller pinion design maintains high repeatable accuracy with Zero Backlash over longer distances with quieter operation - even at high speeds.
Roller Pinion Racks
Nexen Group's patented rack and pinion system with bearing-supported rollers engaging two rack teeth simultaneously, allowing for greater efficiency, longer life and outstanding accuracy.
Linear Precision Brakes
Nexen Group's Profile Rail Brakes and Rod Locks are compact and powerful, delivering precision holding and locking.
Profile Rail Brakes
Nexen Group's linear profile guide rail brakes use spring force to secure the load in holding applications. Superior response time and high force for stopping and holding in e-stop and power-off situations. Each rail brake clamps directly onto the guide rail to provide positive braking and holding in all axes, with no effect on bearing surfaces
Rod Locks
Nexen Group's Spring Engaged, Air Released Rod Locks offer precision holding with guide rod systems and NFPA or ISO cylinders. A large clamping surface ensures consistent performance, ideal for accurate positioning.
Power Transmission
All Power Transmission
Clutches
Friction Clutches
Tooth Clutches
Friction Brakes
Rotary Brakes
Drum Brakes
Caliper Brakes
Friction Clutch-Brakes
Friction Clutch-Brakes
Torque Limiters
Pneumatic Torque Limiters
Mechanical Torque Limiters
Tension Control
Tension Control Brakes
Tension Control Clutches
Web Controls
Clutches
Multiple or single-position tooth clutches are positive engagement devices having open or nickel-plated, enclosed housings. Tooth clutch designs include a pilot-mount version (accepts sprockets or couplings), a flange-mount version that connects to bearing-supported devices and integral sprocket versions. Air-engaged tooth clutches produce up to 60,000 in-lbs. torque. Spring engaged tooth clutches, with up to 72,000 in-lbs. torque, are the ultimate holding device. Single and double-flex couplings, specifically designed for high-torque tooth clutches, are used for inline shaft connections.
Friction Clutches
Nexen Group's single-disc, self-adjusting clutches are mounted on a driving or driven shaft. They cover transmitted horsepower ratings from fractional to 25 hp, torque ratings to 5000 inlb with thermal capacities to 2.5 thermal horsepower, and maximum operating speeds to 3600 rpm. Most are available in Sheave, Pilot, or Coupling Mount versions.
Tooth Clutches
Available in a variety of Single or Multiple Position Models, as well as a Sprocket Tooth design, there are Standard and Metric Models available. Most can be used with a Single or Double Flex Coupling Assembly for in-line coupling applications.
Friction Brakes
Friction brakes have a stationary pad (friction facing) and a rotating wear surface. Common configurations include drum brakes, caliper disc brakes and shaft-mounted brakes with an integral disc and rotor. Friction brakes provide controlled deceleration, stopping, holding, and tension control. Air and spring-engaged versions are available in all brake configurations.
Rotary Brakes
Air or spring-engaged, shaft-mounted friction brakes come with tapered bores to accept QD bushings or straight, bored and keyed-to-size disc hubs. Bushings are available to reduce the size of the standard, straight-bore models. Air-engaged brakes are used for stopping, holding, controlled deceleration, and tension control. Spring-engaged brakes are excellent stopping and holding devices. Multiple sizes provide torque up to 10,000 inlbs.
Drum Brakes
Nexen Group's Drum Brakes are actuated with a diaphragm-sealed actuator that forces a brake shoe on a drum surface to provide the braking torque. Brake drums are bored and keyed to fit standard shafts. The brake shoes are clamped on the outside of the drum to provide brake torque up to 3750 inlbs. Hinge top models offer a convenient feature to change rolls when the brake is used in tension control applications.
Caliper Brakes
Caliper brakes are used in controlled deceleration, cyclic stopping, holding, emergency stops, and tension control applications. Nexen Group offers a wide variety of caliper brake designs, including air actuated/spring-released, spring engaged/air-released, and spring engaged/hydraulic-released models. Several disc diameters up to 24-inches are offered to provide torque up to 50,000 inlbs. Multiple calipers can be used on a single disc to increase torque and accommodate various disc thicknesses.
Friction Clutch-Brakes
Nexen Group's Friction Clutch-Brakes combines the features of a Friction Clutch with a Friction Brake into a single unit. Standard models offer pilot mount, sheave mount and pilot mount with coupling half options. Pilot Mount units are available in various standard bores sizes with customization possible with bushings and couplings.
Friction Clutch-Brakes
Nexen Group's Friction Clutch-Brakes combines the features of a Friction Clutch with a Friction Brake into a single unit. Standard models offer pilot mount, sheave mount and pilot mount with coupling half options. Pilot Mount units are available in various standard bores sizes with customization possible with bushings and couplings.
Friction Clutch-Brakes
Conveniently packaged clutches and brakes for a start and stop applications. Clutch-brake combinations have mounting features that make them adaptable to NEMA and IEC motor frames. All clutch-brakes operate on static air pressure.
Torque Limiters
A torque limiter protects mechanical equipment or its work from damage by mechanical overload. A torque limiter may limit the torque by slipping a friction plate clutch or disconnecting the load entirely. The action of a torque limiter is useful to limit any damage to the machine or product due to mechanical failures or product jams in the machine and is typically installed on the output side of gear reducers to protect the gear set.
Pneumatic Torque Limiters
Nexen’ Group's pneumatically engaged, single-position torque limiters are the best overload protection devices available. The “TL” Series units are ball/detent clutches equipped with overload sensors.
Mechanical Torque Limiters
Nexen Group's Torque Limiters protect the drive and driven components from damage associated with torque overloads caused by material jams, operator error, or various unforeseen reasons that pose a significant threat to machine downtime.
Tension Control
Precise tension control is vital to any web or strip-fed operation, and the product must be fed under tension, processed under tension and wound up again under tension. Tension controllers are an integral part of maintaining this set tension. Nexen tension controllers range from simple systems with diameter feedback (open loop) to dancer control systems and the highest precision systems using web tension sensor feedback (closed loop).
Tension Control Brakes
Nexen Group's Tension Control brakes offer precise control over the full operating range – from the high torque needed to manage a large roll, to the lower torque requirements for more delicate materials and demanding applications.
Tension Control Clutches
Nexen Group's line of Modular Tension Control Clutches is designed to be the most flexible, maintenance-free pneumatic units available for continuous winding operations. Ruggedly built to endure the continuous drag and high heat load that tension control demands, yet extremely sensitive and responsive to a wide range of torque requirements.
Web Controls
Nexen Group's Web Controllers are a closed-loop, load cell-based tension control products which use torque to control the tension of paper, film, foil, or fabric in all zones of web processing machines.
NexSafe® Safety Certified
All NexSafe® Safety Certified
Servomotor Brakes
Servomotor Brakes
Profile Rail Brakes
Profile Rail Brakes
Rod Locks
Rod Locks
Servomotor Brakes
Nexen Group's Spring Engaged, Air Released Servomotor Brakes are available safety certified to comply with international safety standard ISO 13849-1. Category Level up to 4 and Performance Level up to e, can be achieved using NexSafe® products in recommended configuration.
Servomotor Brakes
Nexen Group's Spring Engaged, Air Released Servomotor Brakes are available safety certified to comply with international safety standard ISO 13849-1. Category Level up to 4 and Performance Level up to e, can be achieved using NexSafe® products in recommended configuration.
Servomotor Brakes
Nexen’s Spring Engaged, Air Released Servomotor Brakes are available safety certified to comply with international safety standard ISO 13849-1. Category Level up to 4 and Performance Level up to e, can be achieved using NexSafe® products in recommended configuration.
Profile Rail Brakes
Nexen Group's Rail Brakes Series of linear profile guide rail brakes uses spring force to secure the load in holding applications. Superior response time, high force for stopping and holding in e-stop and power-off situations. Each Rail Brake clamps directly onto the center of the guide rail to provide positive braking and holding in all axes, with no effect on bearing surfaces. These profile rail brakes hold position accurately by reducing drive train backlash and elasticity.
Profile Rail Brakes
Nexen Group's Rail Brakes Series of linear profile guide rail brakes uses spring force to secure the load in holding applications. Superior response time, high force for stopping and holding in e-stop and power-off situations. Each Rail Brake clamps directly onto the center of the guide rail to provide positive braking and holding in all axes, with no effect on bearing surfaces. These profile rail brakes hold position accurately by reducing drive train backlash and elasticity.
Profile Rail Brakes
Nexen Group's Spring Engaged, Air Released Rail Brakes are safety certified to comply with international safety standard ISO 13849-1. Category Level up to 4 and Performance Level up to e, able to be achieved using NexSafe® products in recommended configuration.
Rod Locks
Nexen Group's Static Rod Locks deliver precision holding with virtually no backlash, providing high accuracy in demanding applications. These spring-engaged, air-released units come in both ISO and NFPA sizes. The Rod Lock’s large clamping surface ensures high clamping/holding force, and Nexen offers models for use on a pneumatic cylinder or as a stand-alone unit on a guide rod. The design is sealed and features a natural brushed aluminum finish or a corrosion-resistant, anodized finish.
Rod Locks
Nexen Group's Static Rod Locks deliver precision holding with virtually no backlash, providing high accuracy in demanding applications. These spring-engaged, air-released units come in both ISO and NFPA sizes. The Rod Lock’s large clamping surface ensures high clamping/holding force, and Nexen offers models for use on a pneumatic cylinder or as a stand-alone unit on a guide rod. The design is sealed and features a natural brushed aluminum finish or a corrosion-resistant, anodized finish.
Rod Locks
Nexen’ Group's Spring Engaged, Air Released Rod Locks are safety certified to comply with international safety standard ISO 13849-1. Category Level up to 4 and Performance Level up to e, can be achieved using NexSafe® products in recommended configuration.

With superior performance, these spring-engaged, air-released units supplement air cylinders and guide rods for holding in power-off/e-stop situations. High clamping forces ensure positive holding with minimal air required for release.
Accessories
All Accessories
Pneumatic Control Accessories
Pneumatic Control Accessories
Linear Couplings
Linear Couplings
Pneumatic Control Accessories
Nexen offers a number of Pneumatic Accessories for our line of products.
Pneumatic Control Accessories
Nexen offers a number of Pneumatic Accessories for our line of products.
Pneumatic Control Accessories
Nexen offers a number of Pneumatic Control Accessories for our products that allow for easy connections, servicing, and trouble-free performance.
Linear Couplings
Nexen Group's Linear Couplings protect valuable equipment by controlling misalignment in linear motors, ballscrew actuators, pneumatic cylinders, and rods or sensors.
Linear Couplings
Nexen Group's Linear Couplings protect valuable equipment by controlling misalignment in linear motors, ballscrew actuators, pneumatic cylinders, and rods or sensors.
Linear Couplings
Nexen Group's Linear Coupling help prevent binding or premature wear, providing Zero Backlash misalignment control between linear actuators, ballscrew actuators, pneumatic cylinders, and rods or sensors.
Resources
- Nexen Group Videos
- Frequently Asked Questions
Contact

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PC 408-4 Repair Kit

Product Number 951972 Product Family PC 408-4

Name: PC 408-4 Repair Kit
SKU: 951972

PC 408-4 Repair Kit

Description

PC-408*SEAL KIT

Product Features

Seal Kit

Stock: In stock

WARNING: California Proposition 65

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

Important Details

Application Considerations: Seal Kit Includes Seals, and Gaskets, See User Manual And Parts List For Details

Have a question about a product or application? Contact our Engineers

Dimensions

Dimensions
Length	5.50 in

Notes

Notes
Product Features	Seal Kit

Essential

Cookies in Essential group
Name	Description	Lifetime
CART	The association with your shopping cart.	1 Year
CATEGORY_INFO	Allows pages to be displayed more quickly.	1 Year
COMPARE	The items that you have in the Compare Products list.	1 Year
CUSTOMER	An encrypted version of your customer id.	1 Year
CUSTOMER_AUTH	An indicator if you are signed into the store.	1 Year
CUSTOMER_INFO	An encrypted version of the customer group you belong to.	1 Year
MAGE_CACHE	Local storage of visitor-specific content that enables e-commerce functions.	1 Year
MAGE_MESSAGES	Tracks error messages and other notifications that are shown to the user, such as the cookie consent message, and various error messages, The message is deleted from the cookie after it is shown to the shopper.	1 Year
section_data_ids	Stores customer-specific information related to shopper-initiated actions such as display wish list, checkout information, etc.	1 Year
X-Magento-Vary	Required for page cache to work properly	1 Year
ADD_TO_CART	(Adobe Commerce only) Used by Google Tag Manager	1 Year
GUEST-VIEW	Stores the Order ID that guest shoppers use to retrieve their order status. Guest orders view. Used in Orders and Returns widgets	1 Year
LOGIN_REDIRECT	Preserves the destination page that was loading before the customer was directed to log in	1 Year
MAGE-BANNERS-CACHE-STORAGE	(Adobe Commerce only) Stores banner content locally to improve performance	1 Year
MAGE-TRANSLATION-STORAGE	Stores translated content when requested by the shopper	1 Year
MAGE-TRANSLATION-FILE-VERSION	Tracks the version of translations in local storage	1 Year
PRODUCT_DATA_STORAGE	Stores configuration for product data related to Recently Viewed/Compared Products	1 Year
RECENTLY_COMPARED_PRODUCT	Stores product IDs of recently compared products	1 Year
RECENTLY_COMPARED_PRODUCT_PREVIOUS	Stores product IDs of previously compared products for easy navigation	1 Year
RECENTLY_VIEWED_PRODUCT	Stores product IDs of recently viewed products for easy navigation	1 Year
RECENTLY_VIEWED_PRODUCT_PREVIOUS	Stores product IDs of recently previously viewed products for easy navigation	1 Year
REMOVE_FROM_CART	(Adobe Commerce only) Used by Google Tag Manager	1 Year
STF	Records the time messages are sent by the SendFriend	1 Year
FORM_KEY	A security measure that appends a random string to all form submissions to protect the data from Cross-Site Request Forgery	1 Year
MAGE-CACHE-SESSID	The value of this cookie triggers the cleanup of local cache storage	1 Year
MAGE-CACHE-STORAGE	Local storage of visitor-specific content that enables ecommerce functions	1 Year
MAGE-CACHE-STORAGE-SECTION-INVALIDATION	Forces local storage of specific content sections that should be invalidated	1 Year
PERSISTENT_SHOPPING_CART	Stores the key (ID) of persistent cart to make it possible to restore the cart for an anonymous shopper	1 Year
PRIVATE_CONTENT_VERSION	Appends a random, unique number and time to pages with customer content to prevent them from being cached on the server	1 Year
STORE	Tracks the specific store view/locale selected by the shopper	1 Year

Marketing

Cookies in Marketing group
Name	Description	Lifetime
CUSTOMER_SEGMENT_IDS	Stores your Customer Segment ID	1 Year
EXTERNAL_NO_CACHE	A flag that, indicates whether caching is on or off.	1 Year
FRONTEND	Your session ID on the server.	1 Year
GUEST-VIEW	Allows guests to edit their orders.	1 Year
LAST_CATEGORY	The last category you visited.	1 Year
LAST_PRODUCT	The last product you looked at.	1 Year
NEWMESSAGE	Indicates whether a new message has been received.	1 Year
NO_CACHE	Indicates whether it is allowed to use cache.	1 Year
PERSISTENT_SHOPPING_CART	A link to information about your cart and viewing history if you have asked the site.	1 Year

Google Analytics

Functionality

Cookies in Functionality group
Name	Description	Lifetime
PRODUCT_DATA_STORAGE	Stores data related to viewed products	1 Year
RECENTLY_COMPARED	Stores product IDs of recently compared products.	1 Year
RECENTLY_VIEWED	Stores product IDs of recently viewed products for easy navigation.	1 Year
MG_DNT	Allows you to restrict Adobe Commerce data collection if you have custom code to manage cookie consent on your site	1 Year
USER_ALLOWED_SAVE_COOKIE	Used for cookie restriction mode	1 Year
AUTHENTICATION_FLAG	Indicates if a shopper has signed in or signed out	1 Year
DATASERVICES_CUSTOMER_ID	Indicates if a shopper has signed in or signed out	1 Year
DATASERVICES_CUSTOMER_GROUP	Indicates a customer's group. This cookie is stored as sha1 checksum of the customer's group ID	1 Year
DATASERVICES_CART_ID	Identifies a shopper's cart actions	1 Year
DATASERVICES_PRODUCT_CONTEXT	Identifies a shopper's product interactions. This cookie contains the customer's unique quote ID in the system	1 Year

Name	Description	Lifetime
_ga	Used by Google Analytics	1 Year
_ga_*	Used by Google Analytics	1 Year
_gcl_au	Used by Google Analytics	1 Year
_tt_enable_cookie	Used by TikTok Pixel	1 Year
_ttp	Used by TikTok Pixel	1 Year
_fbp	Used by Facebook Pixel	1 Year
_fbc	Used by Facebook Pixel	1 Year

Rotary Motion Control

Rotary Indexers

Rotary Indexers

Rotary Indexers

Roller Pinion Gears

Geared Bearings

Gears

Precision Brakes

Ball Screw Brakes

Shaft Brakes

Servomotor Brakes

Electric Servomotor Brake

Gearheads

Gearheads

Gearheads

Roller Pinion Racks

Roller Pinion Racks

Roller Pinion Racks

Linear Precision Brakes

Profile Rail Brakes

Rod Locks

Clutches

Friction Clutches

Tooth Clutches

Friction Brakes

Rotary Brakes

Drum Brakes

Caliper Brakes

Friction Clutch-Brakes

Friction Clutch-Brakes

Friction Clutch-Brakes

Torque Limiters

Pneumatic Torque Limiters

Mechanical Torque Limiters

Tension Control

Tension Control Brakes

Tension Control Clutches

Web Controls

Servomotor Brakes

Servomotor Brakes

Servomotor Brakes

Profile Rail Brakes

Profile Rail Brakes

Profile Rail Brakes

Rod Locks

Rod Locks

Rod Locks

Pneumatic Control Accessories

Pneumatic Control Accessories

Pneumatic Control Accessories

Linear Couplings

Linear Couplings

Linear Couplings

Product Number 951972 Product Family PC 408-4

PC 408-4 Repair Kit

Description

Product Features

Price and Delivery are Subject to Change

For Same Day Shipments

WARNING: California Proposition 65

Resources

Important Details

Have a question about a product or application? Contact our Engineers

Dimensions

Notes