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    Category: product spotlight

    Rigging Inspection Services

    As we are starting 2018, don’t forget to inspect all Rigging and Lifting Equipment to make sure that it is ready for another year of service. You can perform these periodic rigging inspections at any time of the year, but it is important to understand that users are required by ASME standards to perform a periodic inspection of all of your slings and hardware at least once a year.  

    Bishop Lifting’s Services Department is available to come to your location and perform rigging inspection services. If you are interested in having Bishop’s Services department perform a periodic inspection on your rigging equipment contact them at 713-674-2266 or services@lifting.com.  Our team can help you develop an inspection schedule that best suits your company's needs.  Sometimes due to severity of use, periodic inspections can be required to be performed monthly, quarterly or annually. 

    You are not required to use a third party for your periodic rigging inspections, and can use any of your employees that consider to be qualified based on experience and training. If you do not feel that you have any employees that are qualified, Bishop Lifting also offers training on rigging gear inspection. We offer many training options from 1 hour presentations all the way up to 2 day Rigging Inspector courses. The length of the training and the scheduling can be customized to meet your needs and your schedule. For more information contact our training department at 713-674-2266 or training@lifting.com.

    Basic Sling Inspection by Type:

    chain sling inspection

    wire rope sling inspection

    web sling inspections

    round sling inspections

    sling inspection posterFor more information on removal criteria for other types of equipment or to get a copy of the Sling Inspection Criteria poster below contact our training department at 713-674-2266 or training@lifting.com.

    Understanding Eye Bolts : 5 Factors to Consider

    Eye boltsUnderstand Eye Bolts with a graphic of an eyebolt secured in beam with wire rope attached are one of the simplest and yet most often misused pieces of rigging equipment. There are several factors that must be considered when choosing and installing eye bolts. When eye bolts are used improperly, they can be damaged or broken leading to catastrophic accidents and injuries even when performing fairly basic lifts. For more information and help choosing the proper eye bolts or other rigging gear for your applications, please contact the Bishop Sales Team at 1-800-972-1041 or email them at sales@lifting.com


    The first item to consider is whether you need a shouldered or non-shouldered eye bolt.

    Non-shouldered eye bolts are only designed to be used for completely vertical lifts. If you are going to be lifting with your slings at an angle or with any kind of angular loading, you will need to use a shouldered eye bolt. Even when using a shouldered eye bolt, you must be sure that it is installed properly before you can apply any type of angular loading to it. If the shoulder is not completely flush so that it can function properly, the shouldered eye bolt can only be used for vertical lifts.  


    eye bolt capacity chartAs the sling angle becomes smaller the tension being placed on the eye bolt increases while the eye bolts capacity diminishes drastically. It is very important that riggers understand this phenomenon completely in order to choose the proper eye bolt to make their lift safely.

    For example, when using a Crosby eye bolt with a tight sling angle of 30 degrees the tension applied to the eye bolts during the lift will be two times the weight of the load being lifted. At the same time, the eye bolt itself has been reduced to 25% of it's original capacity. Some manufacturers do not recommend that you use their eye bolts at an angle below 45 degrees. If you do not account for both the increase in tension and the loss of capacity, the rigger will overload your eye bolt, and you are running the risk of damaging your equipment or dropping the load. 


    The third factor to consider when selecting the correct eye bolt for a lift is to take the dimensions of the eye bolt eye into account. You want to make sure that all hardware and rigging equipment that will be attaching to the eye bolt will fit comfortably into the eye and be able to function properly.

    For instance, if hooks are being attached to the eye bolts, you need to make sure that the hook fits comfortably through the eye. The load should rest in the bowl of the hook, and the hook should be able to align itself with the sling leg and not get kinked when tension is applied.  


    Eye Bolt Install GraphicIt is also important to realize that eye bolts are not designed to rotate under load, and that in order to function properly you must apply tension across the plane of the eye of the eye bolt. The eye bolt must be aligned during installation and tightened to secure it against rotation during lifting. This means the rigger must install the plane of the eye bolt inline with the sling leg. This is done using shims from the manufacturer. It is not recommended that you use more than one shim to align the eye bolt with the sling leg. The manufacturer should be able to provide you with a shim of the proper thickness to turn the eye bolt to the proper alignment.



    The final aspect to consider for proper application of eye bolts is the strength and thickness of the material that the eye bolt will be installed into. Even if the eye bolt you choose is the correct style and capacity, the material into which you are installing it must be capable of surviving the forces that will be applied during the lift. You will want to look at the drawings or consult with an engineer to make sure that the load can be safely lifted with the number of pick points you are planning to use and their locations on the load.

    • In an untapped through-hole, the nut shall be fully engaged. For vertical lifts where the shoulder isn't flush with the load, we recommend a second nut is used on the top of the load.
    • In a tapped blind hole, the effective thread length must be at least 1 1/2 times the bolt diameter when installed in steel. Having at least 2 times the bolt diameter is highly recommended.
    • In a tapped through-hole of less than one bolt diameter of thickness, a nut should be installed on the underside of the load and shall be fully engaged and tightened securely.  
    • For machinery eye bolts, minimum tap depth is the basic shank length plus 1/2 of the nominal eye bolt diameter.  


    If an eye bolt is not the proper rigging hardware for the lift, there are two main alternatives to using eye bolts as your attachment points. 

    Crosby Slide-Loc Lifting Points- Crosby's new SL 150M Slide-Loc has several features that set it apart from the standard eye bolt. It has a patent pending locking mechanism that slides to lock the bolt for installation, then slides back to be ready for lifting.

    • The bail can swivel 360 degrees to keep aligned with the sling line.
    • The Slide-Loc does not lose capacity at any sling angle.
    • It has a larger bail than the standard eye bolt to allow for easier connections with other hardware and slings. 

    Swivel Hoist Rings- when they are installed and torqued properly swivel hoist rings are the most efficient and ideal option to use for lifting points. 

    • They have bail that can pivot 180 degrees and swivel 360 degrees.
    • Installed properly, swivel hoist rings do not lose capacity at any sling angle.
    • There are several different styles of swivel hoist ring that can match up to your particular application. 

    Crosby Slide-Loc, Crosby Slide Lock, The Crosby Group, Eye Bolts

    Swivel Hoist Ring, Rigging Hardware, Lifting Gear, Crosby, The Crosby Group

    Swivel Hoist Ring, Rigging Hardware, The Crosby Group,

    MaxiRider Service Call

    Schedule a Service call today!

    maxirider personnel hoistMaxiRider®  is proud of their years of dependable service and their commitment to personnel safety. We strive to be the best in personnel lifting and the name you can count on when lifting personnel to new heights. As part of our continued commitment to the industries we serve, we offer an experienced field service team. Our team is dedicated to assisting you in maintaining the MaxiRider® at peak performance with confidence you can count on. Our team is available to you and can be scheduled for routine maintenance items, annual inspections and on-site training, please contact us with your request.

    maxirider-personnel-hoistAnnual inspections help maintain normal wear and tear on the equipment.  Don't be caught with a down personnel hoist when it matters the most!  

    When calling for service or annual inspections a few points of information would be helpful to have on-hand:

    • The MaxiRider® (5) digit serial number (found hard-stamped in the MaxiRider® gearbox)
    • Type of MaxiRider® (Crown Mount 110V or Floor Mont 220V)
    • Specific contact information (to include: rig number, location, phone number and point of contact name)
    • Drilling operation and expected day of service/request

     Please contact your MaxiRider® Service Team for assistance!

    Product Spotlight: Thern Davit Cranes

    Thern Davit Cranes – Need a Lift?

    Thern's line of Davit Cranes is the most extensive in our industry.  Ranging from marine, construction, oil & gas, manufacturing, mining, and more, they have a portable or stationary davit crane to suit your needs.  

    Thern Davit Crane Advantages:

    • Simple Installation

    • Industrial Applications: Ability to LIFT up to 3,000 lbs. Ability to rotate and lower to a desired location or position. 

    • Truck Mounted Applications

    • Rooftop Applications: Installed on rooftop applications provide an economical, permanent solution for lifting tools, maintenance, and HVAC equipment.

    • Construction Sites: Great for small lifts up to 2,000 lbs

    • Grain Elevators: Electric or hand-operated davit cranes mounted to the top of elevators provide an easy, economical solution for lifting tools and equipment.

    Depending upon the load weight and dimensions, hook height needed above or below floor level, hook reach required, long or short load lifts, spur gear or worm gear hand or power operated winches, AC/ DC or drill drivable options — our experts will help you choose the perfect davit and winch combination to handle your project with ease. Let us help make your job faster, safer, and easier with the use of the best davit crane available - Made in the USA.



    The “Long Lift” crane is our standard Commander 1000 or Commander 2000 series davit crane fitted with a Thern power winch featuring a modified drum, which is able to handle large amounts of wire rope. This combination allows for long lifts up to 390 feet, which is ideal for the bulk handling and construction industries.



    Although Thern portable davit cranes are most commonly used at water treatment facilities they are also found at job sites, in maintenance shops, in factories, on radar towers, and on rooftops all over the world. Your choice of pedestal, flush, or wall mount bases increases your installation options.



    Although Thern davit cranes are commonly mounted on concrete or other stable structures, they can also be mounted to vehicles for even more portability. Depending upon the vehicle or intended use, our davits can be flush mounted, pedestal base mounted, or even mounted using our wall mount base.



    Although any Thern davit crane model can be mounted on your boat, dinghy, ship, or platform, the Captain Series 571 (1500 lb. capacity) and 572 (2200 lb. capacity) are the most popular crane used on tug boats and in the marine industry all over the world because they provide extended height, extended reach, and smooth 360° rotation while loading supplies and equipment. The Captain series davit cranes are available in manual or power winch operation. An optional ratchet style screw-jack can be added for precise boom adjustment from 45° to 90°.



    Thern winches and davit cranes are commonly found at water and wastewater treatment facilities performing a multitude of tasks at lift stations, in pump houses, collection sewers, bar screening, aeration tanks, clarifiers, filtration, ultraviolet disinfection, biosolid recycling, maintenance shops, and more.