The BERNSTEIN CS-3000

Similar documents
Suspension System CS-3000

Suspension Systems. Quality Commitment

The new BERNSTEIN Aluminium Suspension System

Suspension System CS-3000

Heavy-Duty Suspension System CS-2000 System 80

Modular Control Enclosures CC-4000 / CC-4000 SL. Modern industrial design

BERNSTEIN Aluminium Control Enclosure

RK Monitor Mounting... page 254. GT page 264. GT 50, 60, page 274. Support arm / equipment carrier system

Workspace and storage furnishings

GTK 80. Technical data

METTEC DESK CASES DESK CASES

Construction Enclosure coupling and elbow coupling fittings are die-cast from G AL SI 12 aluminum. Suspension tubing is steel.

The Rittal Flex-Block base/plinth system

Cabinet interiors Summary of ranges

Die changing technique

rm-port rm-port rm-port rm-port

Rittal console systems...

01 Product overview KT series order picking trolleys MultiPick trolley Pick and Pack Order picking container

Rittal CM Compact System Enclosures

innovative and powerful Medical lamps

SCHÄFER IT-Systems The specialists for IT infrastructure

ADJUSTED TO SITUATION AND SPACE

Standard Cutout for Mounting

Conveyors 12. slide strips roller Conveyors roller elements Conveyor rollers Chain Transfer

SCHÄFER IT-Systems The specialists for IT infrastructure

Plenty of space for intelligent solutions.

Applications - Levelling of machine bases or constructions - Boards, partitions, enclosures - Tables, conveyors and work benches

Stirrup-shaped handles, machine handles, apparatus handles

Ripac Vario-Module System Enclosure

Scope of delivery: Lid and base, fixing screws, RO versions with aluminium front panel, 4 rubber feet.

DESK CASES MODIFICATIONS AS PER CUSTOMER S REQUIREMENTS. See pages DESK CASE

EN. Cupboard Trolleys. Versatile Innovative Excellent.

Part-No. Article / Version Supply A Tilt foot bar of ABS, off-white RAL 9002 A

Rolec aluplus. The PlUS in technology and design.

Small cases... the perfect shell for valuable electronics

483 mm (19 ) Server Cabinet Unique Series. Abstract. Features. 1.5 mm strong steel sheet. Load capacity up to 1000 kg. Standard colors grey and black

EExe and EExi terminal boxes in polyester and aluminium for Ex areas

HMI - Human-Machine Interface: Mounting Options

Innovative and Efficient SCHÄFER IT Rack Solutions. Quality made in Germany

Action 1NG. Invacare. Simple, robust and efficient!

Product features & Overview. N1 - N4 A Rotary and part-turn actuators

Trolleys Ergonomic workspaces product catalogue

Hygienic Design. 1.5 Hygienic Design

Telescopic sliding doors

Aluminium Profile Catalog Version 1.0 English

AND DESIGN FROM CONCEPT. Why did we develop Xenon? Experienced team. Christopher Schmidt

Demag KB conical-rotor brake motors. Drives with unique principle

Handwheels, handles, position indicators

System Lamps 35 to 40

Demag DCS-Pro chain hoist Demag DCMS-Pro Manulift. With infinitely variable speed control

Polyester-Enclosures MBP

Cassette awning markilux 6000

WORK STATION BRIDGE CRANES

Pixus Technologies Catalog

Knürr Smaract. Knürr Smaract. CompactRack

Precision levelling wedges Due to their large contact area Bilz precision levelling wedges (PK) for vibration and structure-borne noise insulation

System & Storage Cupboards

THE NEW SERA LED STREET LIGHT. Unique, patented system

348,6 HE = U Carrying handles, horizontal

Hardware Solution for Windows

uni-cart THE RIGHT CHOICE WHERE SPACE IS AT A PREMIUM uni-cart

Secure footing. Easy levelling. Blickle levelling castors with integrated truck lock

Welcome to BOPLA City! ENCLOSURE SERIES

English 1/2015. The Profi le System

Knürr Miracel 2 modular fully configurable

Mounting Options CS600 Stainless Steel Pendant Arm System IEC 60529, IP66

Mini amateur football ground goals, street hockey goals, mobile, fully welded

Awning System markilux planet. The innovative awning-cum-umbrella stand system. markilux.com

KINVARO KINVARO LIFTER SYSTEMS. Modern design, innovative technology and ease of operation for wall cabinetry.

Hahn Serie 60 AT. Universal hinge for versatile application. More modern look Improved technology

BLV HEDRION LED lighting system. New. Unique. Unparalleled.

Hydraulic clamping elements

BERNSTEIN CC-800. Stainless steel enclosure and suspension systems. 2 rue René Laennec Taissy France Fax: , Tel :

Norwich Hostry Norwich, UK. Downlight Lighting

ZERO-POINT CLAMPING SYSTEM

HelaGuard. Non-Metallic Conduit & Fittings

LinidoSolutions wall mounted bathroom safety aids and accessories May

Polycarbonate and ABS enclosures with quick release lid screws CT series

RAILWAY TORQUE WRENCH LDB-10 THE UNIVERSAL GENIUS. formerly

MODUL-iT container carts

Consumer units. Index. Pages. Consumer units UK500 series 1-3 Product features 1-12 Ordering information 1-18 Technical information

2 YEAR WARRANTY HOSE REELS. reelmaster Series heavy duty, quality hose reel engineered to save space

Open style folding-arm awning markilux 930 swing. The designer awning with unique pitch adjustment mechanism. markilux.com

Cabinets PROLINE. Modifications. Overview Cabinets Climate Control Cases Subracks/ 19" chassis Modules...

Article number Last change Valid from REAL 9000 PLUS ADULT The custom built workingchair

HALL LED LET THE SHOW BEGIN

Cable Management Solutions. HelaGuard. Non-Metallic Conduits and Fittings

Polyester enclosures CP series

Aquatec Ocean Family. Ocean Family. Aquatec

Smart Visofold 1000 Series Bi Fold Door System

Educational & industrial chairs

Sociable, reliable, attractive: the newbie liked by everyone.

T e c h n o l o g y f o r T h e W e l d e r s W o r l d. TIG. Product Catalogue 3.1 / V1.

Applications Profitronic 19 / Profitronic 19U

SECURELY HELD. OKW ACCESSORIES are designed to be practical, thus providing you with more flexibility for your individual case.

ROTARY TABLES SERIE TC TECHNOLOGY THAT INSPIRES

Technical System Catalogue Operating housings with handle strips

Event. Road construction. Event. Mobile fence. Building construction. Civil engineering. Storage equipment. Transport equipment

RXD. 194 Downlights & Spotlights

Desk-top cases b. Flexible expansion options, for 19" components e.g. plug-in unit units, or for individual expansion

Transcription:

Flexible and efficient: The BERNSTEIN CS-3000 Designers and manufacturers expect modern suspension systems to feature variable configuration, progressive design and complete ease installation. BERNSTEIN sets standards with the CS-3000: Modern industrial design, well-conceived ergonomics! The combinable components create an innovative system solution based on modular principles for attaching enclosures, especially the BERNSTEIN CC-3000, CC-00 and CC-00 SL enclosures (see Page 72 onwards), to machines and systems. The particular ease of assembly and installation of the CS-3000 is reflected in substantial time savings and cost efficiency. Intermediate joint Elbow Straight coupling Wall joint

In addition to the positively locking tube mounting screws other features include: Six-fold form-fit thanks to component contour in tube attachment area (the otherwise optional safety hole additionally required for overhead installation is rendered unnecessary) One-man installation of the complete system Infinitely variable system alignment means of tube mounting screws Subsequent alignment at any time without dismantling the complete system Cable and installation openings at all joints in the system Different tube lengths for variable configuration Tube machined at one end can be cut to required length (machining templates supplied) Adjustable torque (firmness) of all rotary components (coarse adjustment), fine adjustment means of clamping lever or screw Intelligent design with smooth flowing transition lines for ease of cleaning Six-fold form-fit thanks to component contour in tube attachment area Effortless readjustment possible at any time without the need to dismantle the complete system Other system features: Load diagram Anodises aluminium tubes for long service life and reliable operation Smooth flowing transition lines from the tube to other components prevent dirt built-up (easy to clean) Coated tube mounting screws for sealing threaded holes and secure screw connections Elegant appearance with narrow sections connected adapting the cross section from square to round tube Modular coupling configurations possible (also subsequently), e.g. with adapter for narrow enclosures or tilt adapter Well-conceived ergonomics for easy and virtually fatigue-free operation An ideal single-source solution for BERNSTEIN control enclosures Protection class IP 65 33

CS-3000 HV Vertically adjustable modules for optimum ergonomics With the vertically adjustable CS-3000 HV, BERNSTEIN offers an innovative expansion to the CS-3000 suspension system. Flexible height adjustment and internal cable routing make the HV version even easier to install and operate. With a variable lift range of 2 mm, the support system can be adjusted infinitely variable to the required working height. The integrated gas-filled damper system ensures the enclosure can be raised with minimum effort while preventing it from dropping suddenly after the clamping lever is released. This means added convenience but above all greater safety. The CS-3000 HV is available as an optionally mobile stand base or wall-mounted version and can be easily integrated in an existing CS-3000 system. Overview of advantages: Thanks to the 2 mm variable lift, the ideal viewing height can be adjusted for each operator Gas-filled damper system provides effective support during lifting and prevents the supported enclosure dropping suddenly after the clamping lever is released Internal cable routing Straightforward integration in CS-3000 suspension system Selection criteria Selection of the size of gas-pressurised damper depends on the total weight and the ambient temperature The total weight is calculated from: Enclosure + installed equipment + coupling components Ambient temperature C 30 C 20 C N (6 11 kg) N (5.5 10.5 kg) N (5 10 kg) 1 N (11 19 kg) 1 N (10.5 1 kg) 1 N (10 17 kg) 200 N (19 29 kg) 200 N (1 27.5 kg) 200 N (17 26 kg) 300 N (29 39 kg) 300 N (27.5 37 kg) 300 N (26 35 kg) Damper force/total weight Materials Colours Anodised aluminium tubing Pressure die-cast aluminium components Polyamide covers for installation openings POM bearing Neoprene seals Suspension system components: anthracite grey RAL 16 Connecting tubes: silver (natural) anodised

Application examples for CS-3000 suspension system Versatile configuration options The numerous modules and components that make up the CS-3000 allow for flexible system configuration. This ensures the suspension system can be uniquely adapted to local conditions and fit perfectly in machine and system environments. Square aluminium tubing Standard lengths (available from stock) Article number Tube cross sections Length x 90 x 2 mm 95200001 Length x 90 x 0 mm 95200002 Length x 90 x 7 mm 95200003 Length x 90 x 0 mm 95200004 Length x 90 x 12 mm 95200005 Length x 90 x 10 mm 95200006 Length x 90 x 17 mm 95200007 Length x 90 x 2000 mm 9520000 Tubes machined at one end (machining templates supplied, available from stock) Length x 90 x 0 mm 95200009 Length x 90 x 2000 mm 95200010 If one of our standard lengths does not suit your requirements, we can also supply tubes machined at one end. Simply shorten to the required length and use the supplied template to machine the shortened end. Machined tubes to required lengths We can also supply completely machined tubes to the length you require (price and delivery time on request). Round aluminium tubing Round aluminium tubes in different lengths. We can also supply completely machined tubes to the length you require. (prices and delivery time on request) Length 4 x 4 x 2 mm 95200 Length 4 x 4 x 0 mm 95210 Length 4 x 4 x 7 mm 95212000 Length 4 x 4 x 0 mm 95213000 CS-3000 Bent Tube Express Service: Order 12 noon for next-day delivery! Prices on request Custom bent tubes are now available! Contact us for additional information. 35

Article Article number (colour) Straight Coupling 1015300177 RAL 9006 white aluminium 1015300001 RAL 16 anthracite grey Elbow Coupling 101530017 RAL 9006 white aluminium 1015300002 RAL 16 anthracite grey Details Angle of rotation 300 with stop Adapter 101.5300.011 for attachment to sections < 120 mm) Angle of rotation 300 with stop, installation opening including screw-fit plastic cover Weight in lbs. (g) Material 3.2 (10) 4.6 (20) Accessories (retrofitable) 9052900 9052900 Application example Dimensions in mm 4xM6 4xØ6,5 4xM6 4xØ6,5 214 27 77 35 167 1 Ø10 47 27 35 92 137 37 33 Ø10

Tilt Couplier 15 A 1015300179 RAL 9006 white aluminium 1015300013 RAL 16 anthracite grey Tilt Couplier 15 B 101530010 RAL 9006 white aluminium 1015300014 RAL 16 anthracite grey Tilt Elbow Couplier 15 A 101530011 RAL 9006 white aluminium 1015300015 RAL 16 anthracite grey Angle of rotation 300 with stop, fixed tilt of 15 (variant A tilted back) Angle of rotation 300 with stop, fixed tilt of 15 (variant B tilted forward) Angle of rotation 300 with stop, fixed tilt of 15, installation opening including screw-fit plastic cover (variant A tilted back) 3.7 (160) 3.7 (160) 4. (21) 9052900 9052900 9052900 4xØ6,5 4xM6 4xØ6,5 4xØ6,5 4xM6 4xM6 214 1 1 47 37 130 205 1 15 47 37 130 205 1 1 0 55 175 15 15 37

Article Article number (colour) Tilt elbow coupling 15 B 101530012 RAL 9006 white aluminium 1015300016 RAL 16 anthracite grey Base Coupling 101530013 RAL 9006 white aluminium 1015300017 RAL 16 anthracite grey Details Angle of rotation 300 with stop, fixed tilt of 15, installation opening including screw-fit plastic cover (variant B tilted forward) Angle of rotation 300 with stop Weight in lbs. (g) Material 4. (21) 4.7 (2120) Accessories (retrofitable) 9052900 9052900 Application example Dimensions in mm 4xØ9 4xM/Ø9 4xØ6,5 4xM6 125 27 Ø10 Ø16 214 1 130 94 Ø9 1 1 0 15 55 175 4xM6 4xØ6,5 3

Tilt Base Couplier 15 A 101530014 RAL 9006 white aluminium 101530001 RAL 16 anthracite grey Tilt Base Couplier 15 B 101530015 RAL 9006 white aluminium 1015300019 RAL 16 anthracite grey Straight Coupling 4 101300 RAL 9006 white aluminium 10130000 RAL 16 anthracite grey Angle of rotation 300 with stop, fixed tilt of 15 (variant A tilted back) Angle of rotation 300 with stop, fixed tilt of 15 (variant B tilted back) Angle of rotation 300 with stop, only compatible with 4 mm round tube, required for attachment to 0 mm section 5.2 (20) 5.2 (20) 3.9 (17) 9052900 9052900 4xØ9 4xM/Ø9 4xØ9 4xM/Ø9 125 125 15 Ø16 15 4xØ6,5 4xM6 Ø16 Ø Ø 104 94 16 Ø9 104 94 16 Ø9 1 24 2xM10x12 105 Ø 4xM6 4xØ6,5 Ø7 4xØ6,5 4xM6 39

Article Article number (colour) Coupling for Siemens SIMATIC Pro 101530017 RAL 9006 white aluminium 1015300043 RAL 16 anthracite grey Elbow coupling for Siemens SIMATIC Pro 1015300074 RAL 16 anthracite grey Details Customised coupling for Siemens SIMATIC Pro, angle of rotation 300 with stop Customised coupling for Siemens SIMATIC Pro, angle of rotation 300 with stop, installation opening including screw-fit plastic cover Weight in lbs. (g) Material 3.5 (1) 4.9 (2200) Accessories (retrofitable) 9052900 9052900 Application example Dimensions in mm 4xM6/10 4Ø6,5 214 1 42 107 152 33 Ø10 15

Base coupling for Siemens SIMATIC Pro Tilt coupling 15 for Siemens SIMATIC Pro Tilt elbow coupling 15 for Siemens SIMATIC Pro 1015300075 RAL 16 anthracite grey See Details RAL 16 anthracite grey See Details RAL 16 anthracite grey Customised coupling for Siemens SIMATIC Pro, angle of rotation 300 with stop Customised coupling for Siemens SIMATIC Pro, angle of rotation 300 with stop, fixed tilt of 15 (variant A tilted back, variant B tilted forward) Customised coupling for Siemens SIMATIC Pro, angle of rotation 300 with stop, fixed tilt of 15, installation opening including screw-fit plastic cover (variant A tilted back, variant B tilted forward) 5.0 (22) 1015300076 Tilt elbow coupling 15 A 1015300077 Tilt elbow coupling 15 B 4.0 (110) 101530007 Tilt elbow coupling 15 A 1015300079 Tilt elbow coupling 15 B 5.1 (2290) 9052900 9052900 9052900 125 4xM6/10 4xØ6.5 41.5 Ø10 15 4xM6/10 Ø16 1 94 Ø9 217 1 130 4xØ6.5 214 1 15 47 37 15 1 1 0 55 17 15 15 41

Article Article number (colour) Tilt base coupling 15 for Siemens SIMATIC Pro See Details RAL 16 anthracite grey Tilt adapter (30 infinitely variable) 1015300193 RAL 9006 white aluminium 1015300012 RAL 16 anthracite grey Details Customised coupling for Siemens SIMATIC Pro, angle of rotation 300 with stop, fixed tilt of 15 (variant A tilted back, variant B tilted forward) Used only together with couplings, infinitely variable tilt up to 30, maximum load max. 300 N, compatible SIMATIC Pro couplings Weight in lbs. (g) Material 101530000 Tilt base coupling 15 A 101530001 Tilt base coupling 15 B 5.4 (24) 4.1 (1) Accessories (retrofitable) 9052900 Application example Dimensions in mm 4xM/Ø9 4xØ9 1 2 5 6xM6 3 16 15 15 Ø16 120 77 66 Ø 1 1 1 0 4 94 Ø9 71 10 44 4xM6/10 0-30 Ø10 6 Ø 1 1 6xØ6,5 66 4xØ6.5 Ø 6.5 Ø 42

Elbow Elbow, Rotary Elbow, Reduced RD 4 1015300195 RAL 9006 white aluminium 1015300196 RAL 9006 white aluminium 1015300197 RAL 9006 white aluminium 101530000 RAL 16 anthracite grey 1015300009 RAL 16 anthracite grey 1015300020 RAL 16 anthracite grey With installation opening including screw-fit plastic cover Angle of rotation 300 with stop, installation opening including screw-fit plastic cover Reducer elbow from the square tube to 4 mm round tube 3.7 (160) 5.4 (24) 4.2 (1920) 9052900 195 1 M10 SW5 214 1 Ø4 37 ( 195 ) 125 1 2 17 97 37 195 1 2xM12 43

Article Article number (colour) Top Joint 101530019 RAL 9006 white aluminium 1015300003 RAL 16 anthracite grey Wall Joint S 1015300199 RAL 9006 white aluminium 1015300006 RAL 16 anthracite grey Details Angle of rotation 300 with stop, installation opening including screw-fit plastic cover Angle of rotation 300 with stop, installation opening including screw-fit plastic cover Weight in lbs. (g) Material 5.0 (22) 5.4 (20) Accessories (retrofitable) 9052900 9052900 Application example Dimensions in mm 4xM/Ø9 0 242 17 97 M10 SW5 214 0 1 1 0 1 1 47 130 155 92 137 37 125 35 Ø16 M10 SW5 Ø 9 Ø 16 130 4xM/Ø9 0 Ø9 44

Wall Joint W Intermediate Joint Base / Wall Flange 1015300200 RAL 9006 white aluminium 1015300201 RAL 9006 white aluminium 1015300204 RAL 9006 white aluminium 1015300007 RAL 16 anthracite grey 1015300004 RAL 16 anthracite grey 1015300010 RAL 16 anthracite grey Angle of rotation 300 with stop, 2 installation openings including screw-fit plastic covers Angle of rotation 300 with stop, 2 installation openings including screw-fit plastic covers 2930 29 1300 9052900 9052900 1 1 0 0 155 130 M10 SW5 212 1 1 2 1 0 1 2 130 4xM/Ø9 0 201 1 1 2 0 214 1 M10 SW5 1 130 Ø10 4xM/Ø9 Ø16 Ø 9 Ø 16 125 Ø9

Article Article number (colour) Base, Rotary 1015300205 RAL 9006 white aluminium 1015300005 RAL 16 anthracite grey CS-3000 HV module, vertically adjustable See Details RAL 16/anodised aluminium Details Angle of rotation 300 with stop 1015300022 CS-3000 HV 0/ 1015300029 CS-3000 HV 0/1 1015300031 CS-3000 HV 0/200 1015300033 CS-3000 HV 0/300 Modular height 0 mm; see introduction for detailed information on selection of suitable damper force. Weight in lbs. (g) Material 3.9 (170) 15.5 (30) Accessories (retrofitable) 9052900 Application example Dimensions in mm 4xØ9 4xM/Ø9 125 Ø 37 47 77 167 35 M10 SW5 Ø16 0 Ø9

CS-3000 HV module, vertically adjustable See Details RAL 16/anodised aluminium Large free-standing base 1015300206 RAL 9006 white aluminium 1015300027 RAL 16 anthracite grey Small free-standing base 1015300207 RAL 9006 white aluminium 101530002 RAL 16 anthracite grey 1015300023 CS-3000 HV 00/ 1015300030 CS-3000 HV 00/1 10153000 CS-3000 HV 00/200 10153000 CS-3000 HV 00/300 Modular height 00 mm; see Page 123 for detailed information on selection of suitable damper force. 13.3 (20) 25.1 (116) Steel / Castors and Support feet 29.1 (120) Steel Castors and Support feet 30 30 0 39 5 65 3 0 10 M4xM5 00 47

Article Article number (colour) Tube Adaptor 101530020 RAL 9006 white aluminium 1015300039 RAL 16 anthracite grey Adapter (narrow section) 1015300209 RAL 9006 white aluminium 1015300011 RAL 16 anthracite grey Details Required for connecting tubes shortened directly at place of installation: Tubes machined at one end and of unspecified lengths can be cut to size and connected to the system with the tube adapter Only to be used together with couplings (for attachment to BERNSTEIN enclosures with depths <120 mm) Weight in lbs. (g) Material 1.6 (720).7 (300) Accessories (retrofitable) Application example Dimensions in mm 6xM6 6xØ6,5 10 1 90 13 Ø11 6 Ø10 Ø6.5 4

Coupling Head 900170 RAL 9006 white aluminium 9061000 RAL 16 anthracite grey Bent Tube Customer-specific Anodised aluminium Coupling head for infinitely variable, pivoted attachment of CC-00 and CC-00 control enclosures (infinitely variable from 0 to 30 ) and keyboard consoles (infinitely variable from 0 to 20 ) to coupling components CS-3000. Bent tube manufactured to individual specifications (dimensions min. 0 mm, max. 1.0 mm) Reduced assembly time due to its elbow free design, snag free cable routing, no limitation of the load bearing capacity compared to traditional systems with straight tubes. 7.5 (00) Depending on version 49

CS-3000 Bent Tube Design, simple assembly and ease of cleaning as well as variety of components, load bearing capacity and quality are important criteria for the choice of a suitable suspension system. All of these characteristics are offered BERNSTEIN s CS-3000 Family including the new Bent Tube. Unlike traditional types of configurations (tube elbow tube), the exceptional single piece construction offers a wide range of application opportunities. It is particularly suitable for operator control panels or console enclosures with suspension arm attachments on the bottom, as it reduces the possibility of projection impact injury to machine operator and surrounding people. Product features Material: Anodised aluminium Cross-sectional dimension of the tube: x 90 mm (to match CS-3000 components) No limitation of the load bearing capacity compared to traditional systems with straight tubes Reduced assembly time due to its elbow free design Snag free cable routing Manufactured to individual specifications (dimensions min. 0 mm, max. 0 mm) Application examples

Accessories Article CS-3000 9052900 for coupling and joint components Adjustable in steps of 13.7 Contains ten Ø 10 mm steel balls Article CS-3000 net 9069000 for coupling and joint components Adjustable in steps of 30 Contains 6 swivel angle limiter Apparatus castors 90015300 Castor set, consisting of 2 steering castors and 2 steering castors with total locking for free-standing bases Load-bearing capacity of each castor kg Levelling feet 90012900 Height-adjustable feet (1 set = 4 pieces) for free-standing bases Floor anchoring 90014 Floor anchoring set for the large stand Industrial castors 9001200 Castor set, consisting of 4 steering castors with locking brake Load-bearing capacity of each castor kg Signal lamp adapter 9053 Joint components 90531000 Elbow components For connecting commercially available 25 mm diameter signal lamps to CS-3000 suspension system components Adapter plate 90667000 For connecting adapter flange to coupling 4 (906520000 required together with coupling RD 4 for attachment to CC-00 section 0) Adapter flange 906649000 For enclosure with door section and / or keyboard Screw cover set 906590000 Plastic covers for sealing the tube fastening screws RAL 9006 Kit contains pcs. 51