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Locknuts Catalog TABLE of CONTENTS

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Locknuts Catalog TABLE of CONTENTS Shur-Lok Bearing Locknuts Catalog TABLE OF CONTENTS General Introduction 1-2 STA-LOK POSITIVE LOCKING SYSTEM Bearing Retaining Features And Benefits 3 SL60N Locknut, Sta-lok, Bearing Retaining 4-5 SL60W Lockwasher, Sta-Lok Bearing Retaining 6-7 SL61N Locknut, Sta-Lok, Bearing Retaining 8-10 SL61W Lockwasher, Sta-Lok Bearing Retaining 11-13 Detente Removal Provision SL61WT Lockwasher, Sta-Lok Bearing Retaining 14-15 Thread Removal Provision Snap-In Features And Benefits 16 SL7080 Locknut And Lockwasher, Sta-Lok Snap-In 17-18 Cotter Key Lock Features and Benefits 19 SL7458 Locknut, Sta-Lok, Precise Adjusting 20 Keyway Lock Features And Benefits 21 SL7620 Locknut Keyway Lock 22-23 Spiral Lock Features and Benefits 24 PREVAILING TORQUE LOCKNUTS Face Wrenching Features and Benefits 25 SL7500 Locknut Face Wrenching 26 - 27 SL7501 Locknut Face Wrenching 28 - 29 Vespel Lock Features and Benefits 30 SL7515 Locknut Vespel Lock External Wrenching 31 - 33 Crimp Lock Features and Benefits 34 SL7610 Locknut Crimp Lock External Slots 35 - 37 Segmented Lock Features and Benefits 38 International Specifications for Steels Appendix B TSB001 STA-LOK POSITIVE LOCKING SYSTEM Technical Sales Bulletin Contact Shur-Lok For a Copy LOCKNUTS INTRODUCTION Shur-Lok provides a variety of locknut types Installation and removal of this type of to meet almost any design challenge. Our locknut, requires a secondary locking Locknuts are used for many different component, such as a lockwasher. applications including turbo-machinery, gearboxes, transmissions, aircraft structure, The Shur-Lok positive locking systems aircraft landing gear and high vibration provide the most adaptable and balanced helicopter applications. positive locking systems available. The foundation of this family of parts, is our STA- Whether your design requirements include LOK system. The STA-LOK system uses high vibration, high RPM, superior strength, extremely small serrations in its design to reduced weight, high temperature or corrosion provide precise torque setting of the locknut protection, Shur-Lok can offer a design to this system has been the design standard, meet your needs. Our Product Engineering proven through out the years, in the rigorous Group can assist you with your special or operating conditions of helicopter gearboxes, custom designs, or you can select from our engine assemblies and aircraft landing gear. existing product series. Sizes ranging from .250 to 8.00 inches in diameter can be provided. Metric thread equivalents are also available. Locknuts can be produced from almost any commercially available materials. These include Alloys that offer weight, corrosion, strength and temperature benefits. Commonly used materials are Titanium, A286 CRES, Inconel, 300 series stainless steel and all alloy carbon steels. The 2 basic locknut types offered by Shur-Lok are positive lock and prevailing torque locknuts. Positive lock locknuts, compromise a family of parts that are designed to prevent any unthreading or backing off of the nut by utilizing a mechanical or positive stop. In order for a positively locked locknut to lose preload or locking function when installed, requires the shearing of metal. 1 LOCKNUTS Prevailing torque locknuts are exactly what This brochure illustrates standard series of the term implies. Unlike a positive lock, both positive and prevailing torque locknuts. prevailing torque locknuts provide a frictional We encourage the use of standard series when force or prevailing torque between the nut and possible as this eliminates the lead time the shaft. This frictional force is created associated with custom designs. In the event through interference between the nut locking that your application cannot be satisfied by a feature and the shaft thread. The resulting standard series, Shur-Lok welcomes the prevailing torque, resists unlocking of the submittal of your specific design criteria. threaded joint. In the event that an Shur-Lok has a comprehensive network of “untightening” force acts on the seated nut technical sales people that are available to that is higher than the nut’s prevailing torque work with you on your custom design. and seating torque, the nut will loosen only until the force is removed. When the force is Locknut Styles available within the removed, the locknut’s frictional or prevailing Categories of Prevailing and Positive Lock torque will prevent the nut from further Types: coming off the shaft or the bolt. This example describes prevailing torque function for an Various styles and designs of locknuts are internally threaded locknut. An externally available within the categories of Prevailing threaded locknut functions in an identical Torque and Positive Lock. Those designs are manner, with the exception that it is typically listed below. See indicated pages for a threaded into a housing or an internal shaft detailed description of applications and thread. benefits. 2 Locknut - Positive Lock STA-LOK, BEARING, RETAINING FEATURES AND BENEFITS APPLICATIONS Positive mechanical lock that is not dependent on Interference type - where there is high RPM lubricants or plating for repeatability and/or load reversals. Achieves precise preload - serrations provide Where achieving precise preload is critical and adjustment that eliminates back-off or over- existing nuts cannot provide adequate torque. adjustment. Maintains fatigue strength at reduced weight. Where vibration is present. External serrations in the nonload carryingportion Where weight reduction is a priority and shaft of the thread eliminates keyways allowing wall thickness or diameter can be reduced. reduction of shaft wall thickness or diameter. Where a positive mechanical lock is required. Key way stress concentrations are eliminated. Internal serrations of washer mates with serrated shaft SL60 series nut and washer supplied as separate SERRATIONS - CLEARANCE OR components under NAS 1493 and NAS 1443 part INTERFERENCE FIT numbers. Interference fit is provided by Shur-Lok. SL61 series washer incorporates an additional removal feature. THREAD SIZE .391 through 4.325 inch. SHAFT/BOLT SERRATIONS Broaching serrations on shaft/bolt is required. For installation and removal of locknuts and lockwashers refer to Technical Sales Bulletin - TSB 0001. Metric sizes available on request. 3 LOCKNUT SL60N LOCKNUT, STA-LOK BEARING RETAINING ( NAS 1493 ) LOCKNUT SL60N LOCKNUT, STA-LOK BEARING RETAINING (NAS 1493) 5 LOCKWASHER SL60W LOCKWASHER STA-LOK BEARING LOCKNUT. RETAINING (NAS 1443) 7 LOCKNUT — STA–LOK SL61N LOCKNUT,STA–LOK BEARING RETAINING LOCKNUT — STA–LOK SL61N LOCKNUT,STA–LOK BEARING RETAINING LOCKWASHER SL60W LOCKWASHER STA-LOK BEARING LOCKNUT, RETAINING (NAS 1443) LOCKNUT — STA–LOK SL61N LOCKNUT, STA–LOK BEARING RETAINING LOCKNUT — STA–LOK SL61W LOCKWASHER, RETAINING STA–LOK BEARING LOCKNUT, SAE SERIES LOCKWASHER STA–LOK SL61W LOCKWASHER RETAINING STA–LOK BEARING LOCKNUT, SAE SERIES 12 LOCKNUT SL61W LOCKWASHER, RETAINING STA–LOK BEARING LOCKNUT, SAE SERIES LOCKWASHER STA–LOK SL61WT LOCKWASHER, RETAINING REMOVAL– THREADED STA–LOK, SAE SERIES LOCKWASHER STA–LOK SL61WT LOCKWASHER, RETAINING REMOVAL– THREADED, STA–LOK, SAE SERIES Locknut - Positive Lock STA-LOK, SNAP-IN FEATURES AND BENEFITS APPLICATIONS Positive mechanical lock that is not dependent Where ease of installation is preferred. on lubricants or plating for repeatability. Non-rotating applications where positive Achieves precise preload - serrations provide retention is desired. adjustment that eliminates back-off or over- Where achieving precise preload is critical and torque. existing nuts cannot provide adequate Maintains fatigue strength at reduced weight. adjustment. External serrations in the nonload carrying Where weight reduction is a priority and shaft portion of the thread eliminates keyways wall thickness or diameter can be reduced. allowing reduction of shaft wall thickness or For example: where keyway can be diameter. eliminated. Key way stress concentrations are eliminated. Allows for better shaft balance than Internal serrations of washer mates with conventional positive locks. serrated shaft. Serration clearance for ease of washer installation and removal. SERRATION CLEARANCE OR External lugs of serrated washer engages slots of nut. INTERFERENCE FIT Internal groove of nut accepts retaining ring of Clearance fit is provided by Shur-Lok for ease of washer. installation. Can be designed in various wrenching configurations. THREAD SIZE .250 inch and larger. SHAFT/BOLT SERRATIONS Broaching is required on shaft or bolt. For installation and removal of locknuts and lockwashers, refer to Technical Sales Bulletin - TSB 0001. Metric sizes available on request. 16 POSITIVE LOCK LOCKNUT SL7080 LOCKNUT AND LOCKWASHER STA–LOK, SNAP–IN POSITIVE LOCK LOCKNUT SL7080 LOCKNUT AND LOCKWASHER STA–LOK, SNAP–IN Locknut - Positive Lock STA-LOK, COTTER KEY FEATURES AND BENEFITS INSTALLATION Positive Mechanical Lock that is not SHAFT/BOLT SERRATIONS dependent on lubricants or plating for repeatability. Hex-cap is first used to thread and wrench Achieves precise preload - serrations serrated nut, then remounted to align it’s slots provide adjustment that eliminates back-off with keyhole in shaft Cotter key is then fitted to or over-torque. lock assembly. Broaching serrations on shaft not Typically interchangeable with most required, as nut is locked with cotter pins. For castellated nuts. installation & removal refer to TSB0005. External serrations on nut mates with internal serrations of cap. Serration clearance for ease of cap SERRATIONS
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