5PA5 / 5PA0 The Ensign series portable davit cranes are ideal for many applications. Simple set-up and easy to use. This economical series is specially designed for clearance, lift height, and ergonomic operation. SERIES 500 lb and 00 lb Capacity Portable Davit Cranes Light and portable Adjustable Boom Angle Adjustable Sheave Block Quick-Mount Winch Bracket Roller Bearing for Easy 360 Rotation Manual or Power Winch Operation Five Corrosion-Resistant Finishes Easy, No-Tools Assembly/Disassembly Variety of Bases -Year Warranty Model 5PA5-M HAND / POWER / HYDRAULIC / AIR WINCHES DAVIT CRANES Winona, MN USA www.thern.com
ENSIGN SERIES SERIES FEATURES ADJUSTABLE SHEAVE BLOCK Sheave easily adjusts without tools to 4 different positions allowing for a wide range of height and reach combinations. Adjustable boom ANGLE Convenient stainless steel adjustment screw, with comfortable turning knob, allows for easy, one-hand boom adjustment when not under load. QUICK-MOUNT WINCH BRACKET A variety of Thern winches can be attached to the bracket. After a winch is attached to the bracket, the bracket is easily mounted (without tools) to any of three convenient/ ergonomic positions on the mast via quick-connect pins. SERIES 5PA5 CAPACITY 500 LB 6 KG Sheave 4.5 lb /.0 kg Boom 8.5 lb /.9 kg 3 4 500 NYLATRON FLANGE BEARING The Ensign 500 features a nylatron bearing that supports the mast at the top of the base to assist with the crane s 360 smooth rotation. TAPERED ROLLER BEARING A tapered roller bearing, pinned to the bottom of the mast, allows the crane to rotate 360 under load. Standard only on the Ensign 500. Adjustment Screw 3. lb /.5 kg Bracket 3.4 lb /.5 kg (5PA5) 5.7 lb /.6 kg (5PA0) ROLLER/BALL BEARING* Standard on Ensign 000, the specially designed roller/ball bearing at top of base requires no tools for installation. Allows smooth, easy 360 crane rotation under load. stainless STEEL LOCK* Stainless steel lock assembly keeps crane in position during winch operation and when not in use. Included with roller/ball bearing. Rotation Handle.6 lb /.7 kg Pedestal Base 9. lb / 8.7 kg Mast 0.3 lb / 9. kg Model Shown 5PA5-M *Not available on the Ensign 500 Flush Mount Base 9. lb / 8.7 kg Wall Mount Base 0.7 lb / 9.4 kg
FEATURES AND BENEFITS SERIES 5PA0 CAPACITY 00 LB 544 KG 000 Boom 5.9 lb / 4.0 kg Sheave 6. lb /.8 kg TRADITIONAL FEATURES MANUAL OR POWER operation Thern davit cranes can be configured with a manual winch for short, infrequent lifts or a power winch for longer lifts or heavier loads. Choose from Thern s spur or worm gear hand winches or power winches with 5//60 as standard. Other voltages available as well as pneumatic, hydraulic or DC Volt power operation. CORROSION RESISTANT FINISH Electrostatic powder coated crane and stainless steel fasteners combine to resist corrosion in harsh environments. Other options available include: galvanized, stainless steel and epoxy finishes. Adjustment Screw 6.4 lb /.9 kg Mast 5.4 lb / 3.8 kg Model Shown 5PA0-E With stainless steel finish, 4WP-K electric winch and 5BP Bearing (Availble only on 5PA0) 9.4 lb / 4.3 kg Rotation Handle.8 lb /.8 kg Swaged Ball Fitting Keeper Cable Reel EASY ASSEMBLY/DISASSEMBLY Quick-release stainless steel pins allow for easy assembly and quick disassembly for transport or storage. No tools required. QUICK DISCONNECT ANCHOR For quickly attaching or removing wire rope equipped with a swaged ball fitting - Allows the operator to leave the wire rope attached to the load at all times and simply remove the rope from the winch and attached to the optional wire rope keeper or cable reel. VARIETY OF BASES Pedestal, flush and wall mount bases allow for a variety of mounting solutions and are easily installed to a variety of solid surfaces with anchor bolts or other fastening methods. Bases sold separately. Base cap included with lanyard keeps water and debris out of base when crane is removed. Pedestal Base 5.9 lb / 3.6 kg Flush Mount Base 43.7 lb / 9.8 kg Wall Mount Base 48.5 lb /.0 kg -YEAR WARRANTY Industry-leading two-year limited warranty on all our products. 3
CRANES AND WINCHES FINISHES Crane Finishes for Ensign Series SERIES All cranes come standard with Electrostatic Powder Coat red finish. Four optional finishes also offered are Galvanized, 304 or 36 Stainless Steel, and corrosion-resistant Epoxy. Custom colors are available per customer request - Please contact factory. RED GAL 304 SS Finish Code Model Number ENSIGN 500 ENSIGN 000 Options Description Powder Coat (Red) RED 5PA5 5PA0 Standard N/C Red electrostatic powder coating applied to all cranes - Good Galvanized GAL 5PA5G 5PA0G Optional/Extra An economical choice that provides extra protection - Better 304 Stainless Steel 304SS 5PA5S 5PA0S Optional/Extra Electro-polished for added protection - Best 36 Stainless Steel 36SS 5PA5S36 5PA0S36 Optional/Extra A higher level of corrosion protection - Premium Epoxy (Gray) EPX 5PA5X 5PA0X Optional/Extra 3-part epoxy is impact, fire, water, and slip-resistant - Premium 36 SS EPX WINCHES For Ensign Series M M MX M3 Hand Winches Winch Winch Model No. Description Finish Approx. Ship Weight M40PB-K (5PA5) Spur gear hand winch with brake M Zinc Plated 7 lbs 7.7 kg M43PB-K (5PA0) Spur gear hand winch with brake M 4WMV-K Worm gear hand winch with brake Red Enamel 4 lbs 9. kg MX 4WMVEGRA-K Worm gear hand winch with brake Epoxy Paint (Gray) 4 lbs 9. kg M3 M404PBSS-K M43PBSS-K (5PA5) Stainless steel spur gear hand winch with brake (5PA0) Stainless steel spur gear hand winch with brake Stainless Steel 4 lbs 0.9 kg All hand winches include disc brake for load control and steel gear covers to protect gears and help prevent injuries. NOTE: Worm gear requires more turns with less effort than a spur gear winch. Electric Winches EX Electric Winch Model No. Line Speed st Layer Full Drum E 4WPV-K 8 fpm 3 fpm EX 4WPVEGRA-K 8 fpm 3 fpm E4 4777-K 3 fpm fpm E4X 4777EGRA-K 3 fpm fpm E4DC 4777DC-K 3 fpm fpm E4XDC 4777DCEGRA-K 3 fpm fpm Finish Enamel Paint Epoxy Paint Enamel Paint Epoxy Paint Enamel Paint Epoxy Paint Power 5 Volt, AC, Single Phase 5 Volt, AC, Single Phase 5 Volt, AC Single Phase 5 Volt, AC Single Phase Control (Pendant) Approx. Ship Weight 6 ft 85 lbs 39 kg 6 ft 85 lbs 39 kg 6 ft 0 lbs 50 kg 6 ft 0 lbs 50 kg Volt, DC 0 ft 4 lbs 57 kg Volt, DC 0 ft 4 lbs 57 kg All electric winches mount on boom via quick mount bracket and are equipped with internal break for load control. E4 E E4DC E4X E4XDC 4
BASES AND WIRE ROPE BASES (sold separately) For Ensign Series SERIES Select the appropriate base(s) for your application from the chart below. Matching your crane with multiple bases provides optimal worksite flexibility and an economical solution for servicing multiple lift stations. Pedestal Flush Wall Mount Finish Pedestal Flush Wall 5PA5 5PA0 5PA5 5PA0 5PA5 5PA0 Powder Coat Paint 5BP5 5BP0 5BF5 5BF0 5BW5 5BW0 Galvanized 5BP5G 5BP0G 5BF5G 5BF0G 5BW5G 5BW0G 304 Stainless Steel 5BP5S 5BP0S 5BF5S 5BF0S 5BW5S 5BW0S 36 Stainless Steel 5BP5S36 5BP0S36 5BF5S36 5BF0S36 5BW5S36 5BW0S36 Epoxy Paint 5BP5X 5BP0X 5BF5X 5BF0X 5BW5X 5BW0X Approximate Ship Weight lbs (9.5 kg) 56 lbs (5.4 kg) lbs (9.5 kg) 47 lbs (.3 kg) 3 lbs (0.4 kg) 5 lbs (3.6 kg) GAL SS WIRE ROPE Assembly (sold separately) For Ensign Series Length Ratings* Galvanized Aircraft Cable 304 Stainless Steel Rope 36 Stainless Steel Rope 3/6" Dia /4 Dia. 3/6" Dia. /4 Dia. 3/6" Dia. /4 Dia. 00 lbs (544 kg) 000 lbs (907 kg) 000 lbs (454 kg) 800 lbs (86 kg) 800 lbs (363 kg) 400 lbs (635 kg) 0 ft - 6 m WA9-0NS WA5-0NS WS9-0NS WS5-0NS WSS9-0NS WSS5-0NS 8 ft - 8.5 m WA9-8NS WA5-8NS WS9-8NS WS5-8NS WSS9-8NS WSS5-8NS 36 ft - 0.9 m WA9-36NS WA5-36NS WS9-36NS WS5-36NS WSS9-36NS WSS5-36NS 45 ft - 3.7 m WA9-45NS WA5-45NS WS9-45NS WS5-45NS WSS9-45NS WSS5-45NS 60 ft - 8. m WA9-60NS WA5-60NS WS9-60NS WS5-60NS WSS9-60NS WSS5-60NS 75 ft -.8 m WA9-75NS WA5-75NS WS9-75NS WS5-75NS WSS9-75NS WSS5-75NS 90 ft - 7.4 m WA9-90NS - WS9-90NS - WSS9-90NS - Thern winches and cranes are sold without wire rope. However, we carry top quality wire rope assemblies optimally designed for use with our winches and cranes. The assemblies above are equipped with a swaged ball fitting and swivel hook (Enamel w/galvanized rope or Stainless Steel with SS rope) *Based on 3.5: design factor NOTE: /8 wire rope is available with a reduced load rating. Please contact the factory. 5
PERFORMANCE 500 M M3 E4 Ensign 500 Lift Below Floor Level Lift Below Floor Diameteter Length 3 Winch Configurations Minimum (B4) Maximum (B) M M M3 E E4 (ft) (m) (ft) (m) (in) () (ft) (m) M 0 0 5.5 3/6 5 0 6.0 x - x - x 8.4 3 3.9 3/6 5 8 8.5 x - x - x 6 4.8 6.4 3/6 5 36 0.9 x - x - x 5 7.6 30 9. 3/6 5 45 3.7 x - x - x 40. 45 3.7 3/6 5 60 8. - - x - x 55 6.7 60 8. 3/6 5 75.8 - - x - x 70.3 75.8 3/6 5 90 7.4 - - - - x For long lifts (Up to 40 (73.m)) please contact factory 0 0 5.5 /4 6 0 6.0 - x x x x 8.4 3 3.9 /4 6 8 8.5 - x x x x 6 4.8 6.4 /4 6 36 0.9 - x x x x 5 7.6 30 9. /4 6 45 3.7 - x x x x 40. 45 3.7 /4 6 60 8. - - - - x Lift below floor level varies depending on boom position and base configuration. For longer lifts, please contact factory. Performance Characteristics are for standard products referred to in this manual. Non-standard products may vary from the original design. Contact Thern, Inc. for this information. 3 Wire rope assemblies include a hood and a swaged ball fitting to work with quick disconnect anchor on winches, cable spooler and wire rope keeper. 36SS wire rope is also available. Please contact the factory. E 4 B 3 lift below floor level A IMPORTANT: It is the owner or operator s responsibility to determine the suitability of the equipment to its intended use. Study all applicable codes, manuals and regulations. Be sure to read the Owner s Manual supplied with the equipment before operating it. 6
PERFORMANCE Ensign 500 on Pedestal Base Performance Ratings 500 Boom Position Load Rating Hook Reach Hook Height (lb) (kg) (in) () (in) () A- 500 6 7 43 74 879 A- 400 8 558 79 006 A-3 300 36 8 7 87 09 A-4 50 3 36 94 96 438 B- 500 6 4 355 76 930 B- 400 8 7 43 83 08 B-3 300 36 558 9 3 B-4 50 3 8 7 0 565 Lift below floor level varies depending on boom position and base configuration. For longer lifts, please contact factory. Performance Characteristics are for standard products. Non-standard products may vary from in SCH 40 pipe the original design. Contact Thern, Inc. for this information. 7.0 in 8. in (78 ) (06 ) Pedestal Base 5BP5 4x.6 in (4 ) dia hole 4 in 896 39 in 99.38 in dia 60 60 B 50 A 50 lbs 3 kg 4 300 lbs 36 kg 400 lbs 3 8 kg 500 lbs 7 kg 0 in 3048 08 in 743 96 in 438 84 in 33 7 in 89 60 in 54 9 94 4 in 60 in 305 hook height above floor in SCH 40 pipe 7.0 in 8. in (78 ) (06 ) 4x.6 in (4 ) dia hole 4.6 in (370 ) 3.5 in dia (89 ).5 in (3 ) MAST C L in 305 4 in 60 hook reach 94 9 0 4.6 in (370 ) 3.5 in dia (89 ) Flush/Wall.5 in Mount Performance Ratings (3 ) Boom Position Load Rating Hook Reach Hook Height (lb) (kg) (in) () (in) () A- 500 6 7 43 60 54 A- 400 8 558 65 65 A-3 300 36 8 7 73 854 A-4 50 3 36 94 8 08 B- 500 6 4 355 6 574 B- 400 8 7 43 69 75 B-3 300 36 558 77 955 B-4 50 3 8 7 87 09 Lift below floor level varies depending on boom position and base configuration. For longer lifts, please contact factory. Performance Characteristics are for standard products. Non-standard products may vary from the original design. Contact Thern, Inc. for this information. Wall-Mount Base 5BW5 in SCH 40 pipe.4 in (0 ) 4.6 in (7 ) 0.0 in (54 ) 4.6 in (370 ) 8. in (06 ) 8.0 in (03 ) 4 x.6 in (4 ) dia hole 3.5 in dia (89 ) 99 in 54 5 in 635 MAST C L.38 in dia 60 in 305 60 B 50 lbs 3 kg 4 300 lbs 36 kg 400 lbs 3 8 kg 500 lbs 7 kg 4 in 60 hook reach 50 A 94 Flush-Mount Base 5BF5 in SCH 40 pipe 7.0 in 8. in (78 ) (06 ) 4x.6 in(4 ) dia hole.5 in (3 ) 3.5 in dia (89 ) 9 08 in 743 96 in 438 84 in 33 7 in 89 60 in 54 9 94 4 in 60 in 305 0 4.6 in (370 ) hook height above floor 7
M M3 PERFORMANCE E4 000 Ensign 000 Lift Below Floor Level M E Lift Below Floor Diameteter Length 3 Winch Configurations Minimum (B4) Maximum (B) M M M3 E E4 (ft) (m) (ft) (m) (in) () (ft) (m) 5.5 9.7 3/6 5 8 8.5 x - x - x 3 3.9 7 5. 3/6 5 36 0.9 x - x - x 3 4 B A 6.7 6 7.9 3/6 5 45 3.7 x - x - x 37. 4.4 3/6 5 60 8. x - x - x 5 5.8 56 7.0 3/6 5 75.8 x - x - x 67 0.4 7.6 3/6 5 90 7.4 x - x - x 97 9.5 0 30.7 3/6 5 0 36.5 - - - - x For long lifts (Up to 40 (73.m)) please contact factory 5.5 9.7 /4 6 8 8.5 - x x x x 3 3.9 7 5. /4 6 36 0.9 - x x x x 6.7 6 7.9 /4 6 45 3.7 - x x x x 37. 4.4 /4 6 60 8. - x x x x 5 5.8 56 7.0 /4 6 75.8 - - - - x 5.5 9.7 5/6 8 8 8.5 x - x - x 3 3.9 7 5. 5/6 8 36 0.9 x - x - x lift below floor level 6.7 6 7.9 5/6 8 45 3.7 - - - - x Lift below floor level varies depending on boom position and base configuration. For longer lifts, please contact factory. Performance Characteristics are for standard products referred to in this manual. Non-standard products may vary from the original design. Contact Thern, Inc. for this information. 3 Wire rope assemblies include a hood and a swaged ball fitting to work with quick disconnect anchor on winches, cable spooler and wire rope keeper. 36SS wire rope is also available. Please contact the factory. IMPORTANT: It is the owner or operator s responsibility to determine the suitability of the equipment to its intended use. Study all applicable codes, manuals and regulations. Be sure to read the Owner s Manual supplied with the equipment before operating it. 8
Ensign 000 on Pedestal Base Performance Ratings Boom Position Load Rating Hook Reach Hook Height (lb) (kg) (in) () (in) () A- 00 544 6 660 93 36 A- 000 453 3 8 98 489 A-3 800 36 39 990 04 64 A-4 650 94 48 9 844 B- 00 544 558 97 463 B- 000 453 6 660 03 66 B-3 800 36 3 8 0 794 B-4 650 94 39 990 0 3048 Lift below floor level varies depending on boom position and base configuration. For longer lifts, please contact factory. Performance Characteristics are for standard products. Non-standard products may vary from the original design. Contact Thern, Inc. for this information. Pedestal Base 5BP0 PERFORMANCE 60 B 50 A 650 lbs 94 kg 800 lbs 4 36 kg 000 lbs 3 453 kg 00 lbs 544 kg 000 44 in 3658 3 in 3353 0 in 3048 08 in 743 96 in 438 84 in 34 7 in 89 60 in 54 9 94 hook height above floor (8 ) 4.5 in (368 ) 4X (8 ) 5.88 in (403 ) 5.88 in (403 ) 4.5 in (368 ) (8 ) 4.5 in dia (4 ).56 in (4 ) 4.63 in (37 ).38 in (7 ) MAST C L 3.5 in dia 89 in 305 4 in 60 hook reach 94 9 60 in 54 4 in 60 in 305 0 Flush/Wall Mount Performance Ratings Boom Position Load Rating Hook Reach Hook Height Wall-Mount Base 5BW0 (lb) (kg) (in) () (in) () A- 00 544 6 660 79 007.38 in A- 000 5.75 in 453 (7 ) 3 8 84 34 (46 ) A-3 800 36 39 990 90 86 A-4 650 94 48 9 98 489 B- 00 544 558 83 08 B- 000 453 6 660 89 6 B-3 800 36 3 8 96 438 B-4 650 94 39 990 06 69 Lift below floor level varies depending on boom position and base configuration. For longer lifts, please contact factory..38 in 5.75 in Performance Characteristics are for standard products. Non-standard products may vary from (7 ) (46 ) the original design. Contact Thern, Inc. for this information. 5.75 in (46 ) 4X (8 ).38 in (7 ).56 in (4 ) 4.5 in (368 ) 4X (8 ) (8 ) 4.5 in dia (4 ) 5.88 in (403 ).56 in (4 ) 4.5 in (368 ) (8 ) 5.88 in (403 ) 4.5 in (368 ) 4X (8 ) (8 ) 4.5 in dia (4 ) 5.88 in (403 ).56 in (4 ) 4.5 in (368 ) (8 ) (8 ) 4X (8 ) 3.5 in dia 89 4.5 in MAST C (368 ) 5.88 in L (403 ) 4.5 in dia (4 ) 5.88 in (403 ) 4 in 60 94 in 305 4.5 in (368 ) hook (8 reach ) 60 B 50 A 650 lbs 94 kg 800 lbs 4 36 kg 000 lbs 3 453 kg 00 lbs 544 kg 9 60 in 54 3 in 3353 0 in 3048 08 in 743 96 in 438 84 in 34 7 in 89 60 in 54 9 94 4 in 60 in 305 Flush-Mount Base 5BF0.38 in (9.7 ).94 in (4 ) 4.5 in (36 ) (8 ) 4.5 in (368 ) 5.88 in (403 ).38 in (9.7 ).94 in (4 ) 0 4X (8 ) hook height above floor 5.88 in (403 ) 4.5 in (368 ) (8 ) 9
ACCESSORIES Accessories for Ensign Series Item Part Number Description Roller/Ball Bearing Comes Standard on 5PA0 (Not available on 5PA5) 5PT0BRG 5PT0BRG-S 5PT0BRG-S36 5PT0BRG-SS 5PT0BRG-SS36 5PT0BRG-X Red electrostatic powder coat paint finish - Good 304 Stainless steel electro-polished finish for added protection - Better 36 Stainless steel electro-polished finish for a higher level of protection - Best 304 Stainless steel - For use with stainless steel base only 36 Stainless steel - For use with stainless steel base only 3-part epoxy paint (gray) finish for higher level of protection - Premium 5PA5 Series Rotational Lock Base Anchor Kit 5PA5LCK-S 5PA5LCK-S36 5PQ5LCKF-S 5PA5LCKF-S36 AN50A-5 AN50A-5S AN50A-5S36 AN6A-6 AN6A-6S AN6A-6S36 Optional 5PA5 rotation lock holds crane position at 30 increments For pedestal and wall mount bases - 304 Stainless Steel For pedestal and wall mount bases - 36 Stainless Steel For flush mount base - 304 Stainless Steel For flush mount base - 36 Stainless Steel 4 Hilti Zinc Plated Steel fasteners / X 5.50 STL KB-TZ 4 Hilti 304 Stainless Steel fasteners / X 5.50 SST304 KB-TZ 4 Hilti 36 Stainless Steel fasteners / X 5.50 SST36 KB-TZ 4 Hilti Zinc Plated Steel fasteners 5/8 X 6.00 STL KB-TZ 4 Hilti 304 Stainless Steel fasteners 5/8 X 6.00 SST304 KB-TZ 4 Hilti 36 Stainless Steel fasteners 5/8 X 6.00 SST36 KB-TZ Drill-Drive KitS ED300-DW ED300-DW06 0 VAC,.5 amp, 300rpm drill-motor to power drive the hand winch. Only available for cranes configured with the M winch option. Includes -/8 hex drive socket. CORDLESS KIT: 60 V Brushless Motor, 300rpm drill-motor to power drive the M hand winch option. Includes -/8 hex drive socket. Cable Spooler RW50 36 stainless steel reel winds up wire rope when detached from crane. Headache Ball HB0--5 HB0-5-38 HB0S--5 HB0S-5-38 Red Painted 0lb fits 3/6 to /4 Rope Red Painted 0lb fits /4 to 3/8 Rope Stainless Steel 0lb fits 3/6 to /4 Rope Stainless Steel 0lb fits /4 to 3/8 Rope Keeper RK9-5S RK9-5S36 Stainless steel bracket attaches to base or other structure to hold free end of the wire rope when detached from the crane. IMPORTANT: It is the owner or operator s responsibility to determine the suitability of the equipment to its intended use. Study all applicable codes, manuals and regulations. Be sure to read the Owner s Manual supplied with the equipment before operating it. 0
OPTIONS Additional Options for Ensign Series Thern offers a variety of additional options you can choose to enhance your davit crane. FACTORY LOAD TEST Upon request, Thern can test your crane prior to shipping, up to 5% of rated load. EXTENDED 5-YEAR WARRANTY Extend our standard -year warranty to 5 years. PE Stamp - professional ENGINEER STAMP Available upon request at time of order. CE MARK Available upon request at time of order, CE mark for products sold into the European union. ATEX CLASSIFICATION Specially rated for use in explosive settings. Available upon request at time of order. POWER WINCH operation AC electric in any voltage. DC electric, hydrualic and pneumatic power winches available. Custom electric controls Thern can build the high quality controls you need to operate your equipment. DRILL-DRIVEABLE WINCH A worm gear hand winch is also available for operation with a 400 rpm max drill motor option. LIMIT SWITCH Add an emergency safety shut-off to ensure safe operation. Customization Customization is available for almost all Thern products and should always be performed by our engineers to assure the changes meet our stringent quality standards. Below are some of our more coon customization requests. Only factory modifications are covered under warranty. Special davit crane built to lift UV panels at water treatment facilities LONGER lift distances Customized winch and crane configurations to accoodate longer lifts. Custom colors & finishes Custom colors and finishes are available to match your unique application Extended boom and masts Thern can extend mast heights and boom lengths to fit your needs RELOCATE the winch The winch can be relocated to fit confined spaces or height restrictions SPECIAL bases Custom bases or mounting requirements can be manufactured to meet your unique situation
MADE IN USA Thern, Incorporated World Headquarters 57 Industrial Park Road Winona, MN USA TF: -800-843-7648 Phone: -507-454-996 www.thern.com ENCS-048 Thern Europe Bedrijvenpark Twente 454e 760 KM Almelo The Netherlands Phone: +3-546-898-380 europe@thern.com