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Weight Types:

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Weight Set?

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Construction Type:

Calibration Certificate (NVLAP)?

Traceable Certificate / Traceability Report?

Materials:

Non-magnetic?

Help with Weights specifications:

Weight Types
           
   Your choices are...         
   Balancing / Dynamic Balancing Weight       Balancing or dynamic balancing weights are used to help balance rotating components or machinery. If not balanced properly, rotating components exhibit unbalanced centrifugal forces. In turn, this causes noise, wear, vibration, and premature component failure. There are many different types of balancing weights. Products include balancing correction weight kits, balancing clips, balancing c-clamps, balancing machine drive belts, and lead weights for balancing sheaves. Balancing weight suppliers can assist both commercial and industrial customers with selection and sizing. As a rule, the faster a component rotates, the more critical balancing weights become. Balancing clips vary by type and application. For example, squirrel cage balancing clips are slightly-curved balancing weights that are designed for balancing fans with curved blades. Backward-incline balancing clips are flat pieces of metal that are used to balance flat-bladed fans. They are usually made of spring steel or stainless steel. Steel balancing c-clamps are suitable for both squirrel cage fans and vane axial flow fans. They have a serrated surface that functions as a second set screw. Heavy-duty balancing c-clamps are balancing weights that are designed for outdoor environments where fan blades may rust or corrode. Balancing weights include air foil clips, devices which are designed for blowers. Throat size is the most important specification to consider. Typically, suppliers of air foil clips designate their products as narrow throat, wide throat, and extra-wide throat. Air foil clips may also be coated with polytetrafluoroethylene (PTFE) to provide chemical resistance. Other types of balancing weights include balancing machine drive belts, products which improve belt performance and reduce noise levels; and adhesive-backed lead weights for balancing sheaves, products which may be used to improve the performance of fan blades. Balancing correction weight kits may consist of many different types of products. For example, a balancing weight starter kit may include squirrel cage clips, steel c-clamps, airfoil clamps in both standard and extra-wide sizes, lead weights, and an adjustable carrying case. Balancing weights that come in kit form may also include products such as backward incline clips or squirrel cage clips. Replacement packages and specialized or custom balancing weights are also commonly available. Accessories may include wrenches and markers for indicating magnet locations. 
   Ballast / Buoyancy Control Weight       Ballast or buoyancy control weights are used to modify the buoyancy of a marine vessel (boat, ship, barge), balloon, or aircraft to alter the center of gravity, weight distribution, enhance stability or improve motion comfort. Sinkers, cable weights, line weight, net weights, fishing weights, and crabbing weights are buoyancy control weights for specialized applications. 
   Calibration / Test Weight       Calibration weights and test weights includes weight for calibrating masses, weight, and balances as well as weight for mechanical testing applications requiring a load or force for tests or experiments. 
   Calibration Weight / Mass Standard       Calibration weights, mass standards, reference weights, or laboratory weights have a certified mass or weight, which is traceable to national or international laboratory standards such as NIST, ANSI/ASTM, or OIML ISO. A standard mass or precision weight can be used to calibrate scales, balances, weigh cells, and other masses or weights 
   Test / Load Test Weight       Test weights or load test weights are used to apply or generate a load for proof testing materials or products, mechanical testing, materials testing, elevator testing, crane testing, cable testing, and laboratory experiments. Test weights are also used for pressure generation on deadweight testers, which are a type of pressure calibrator.  
   Counterweight / Counterbalance Weight       Counterweights are used to counterbalance an opposing mass in a linear or rotary motion system, allowing movement with lower driving forces. 
   Inertial (Damper, Flywheel) Weight       Weights designed for inertial applications such as:
  • TMD, dampening or dampener weights
  • Flywheels and rotary inertial devices
  • Projectiles, penetrators, bullets, darts, golf balls, golf clubs
  • Pendulum (watch or clock)
 
   Mooring Weight       Mooring weights are massive blocks, plates, or cast weights used to securely hold a vessel at a point in a harbor. Mooring weights are made from steel, concrete, granite, or stone. Mooring weights are different than anchors, which utilize hooks or teeth to grip into mud or sand. 
   Pipeline Weight       Pipeline weights are used to hold down pipeline and prevent dislocation or movement from buoyancy in areas with water such as pipelines running across lake bottoms, river beds or sea floors. 
   Specialty / Other       Other unlisted, proprietary or specialized weights such as vehicle traction weights, crusher weights, cable weights, fishing line weights, sinking weights and wrecking balls or demolition weights. 
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Mass / Weight Denomination
   Denomination       The mass or weight of the calibration or reference weight in metric (SI, GMS, grams or kilograms) or avoirdupois (English, Imperial, pounds or ounces) units. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Units or Measurement System       
   Your choices are...         
   Avoirdupois (Lbs., Oz.)       Avoirdupois weight units include pounds, ounces, and tons. Avoirdupois unit systems are sometimes called Imperial or English units, but avoirdupois is the typically terminology used for the weights and weighing industry. 
   Metric (SI, g or kg)       Metric weight units include grams, kilograms, and metric tons. Avoirdupois unit systems are sometimes called as SI or GMS units system, but metric is the typically terminology used for the weights and weighing industry. 
   Specialty / Other       Other unlisted, proprietary or specialized unit of weight such as pennyweight, grains, or troy ounces. 
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Weight Type / Shape
   Shape       
   Your choices are...         
   Adhesive / Stick-on Weight       Stick-on weights have an adhesive layer or tape on one surface to allow bonding to a surface for balancing or weight adjustment. 
   Bag Weight (Water / Sand)       Weight is in the form of a bag filled with sand, gravel, water or metal shot. Weight bags are used to proof test cranes and hoists. They are also used as set-on pipeline weights. 
   Bar / Rod Weight       Weights in the forms of bars or rods. Bar or rod-shaped weights are typically used as ballast, counter, or balancing weights. 
   Block Weight / Brick       Weights in the forms of bars or rods. Brick shaped weights are typically used as ballast, counter, test or balancing weights. Block shaped weights are commonly used in calibration of higher capacity scales. Block weights often have a grip handle and are also called grip handle weights. Hock-style block calibration weights have a hook and are hung from a weight cart. Very heavy block weights are sometimes stackable. A weight cart or lift may be required to move very heavy block weights. 
   Clamp-on / Split Weight       Weights in the form of a clamp-on or split construction. Clamp-on or split construction weights are design for use as ballast weights, sinking weights, pipeline weights, fishing line weights, and cable weights. 
   Clip-on Weight       Clip-on weights are commonly used as balance or dynamic balancing weights on wheels or rotating spindles. The weights clip-on to the wheel or rim. 
   Cylinder Weight       Weights in the form of a cylinder. Cylindrical shaped weights are often used as scale calibration weights. 
   Fasten / Bolt-on Weight       Weight designed to bolt-on or fasten onto a ship, spindle, pipeline, or other component. Bolt-on weights are typically used as ballasts, balancing weights, counterweights, load test weights, and as other specialized weights. 
   Grip Handle Weight       Weights with an integral handle or grip handle for manual lifting.  Grip handle weights are commonly used in calibration of higher capacity scales and for load application or testing. 
   Hook Weight       Weights with an integral hook for hanging from a scale or weight cart. Hook style weight can vary from small weights for use as counterweights on mechanical scales to heavy weights used on a weight cart for elevator testing or load testing. 
   Ingot Weight       Weights in the form of ingots. Ingot shaped weights are typically used as ballast weights. 
   Knob Weight       Knob weights have a classically recognizable shape for calibration weights. Knob weights have a small knob on the top for lifting and handling with a weigh fork or weigh handle. Knob weights are typically made from polished brass or stainless steel. 
   Leaf Weight       Weights in the forms of leaf or thin metal tab. Leaf-shaped weights are typically used as calibration weights. Leaf weights have very low denominations. 
   Plate Weight       Weights in the form of metal plates. Plate-shaped weights are typically used as ballast, counter, test or balancing weights. 
   Ring Weight       Weights in the forms of ring, toroid, or doughnut. Ring-shaped weights are typically used as inertial, test, counter, or balancing weights. 
   Set-on Weight       Set-on weights are placed on top of a pipeline or equipment and use gravity to hold the weight in place. Pipeline bag weights are often set-on weights, but some bag weights are strapped or tied on. 
   Shot / Pellet Weight       Weights in the form of shot or pellets. Shot or pellet-shaped weights are typically used as ballast, counter, or balancing weights. They are also used for adjusting or correcting a reference weight by addition of shot to a cavity in the reference weight. 
   Slotted Weight       Slotted weights have a disc shape with a slot from the center of to the outer diameter of the disc. Slotted weights are often used as test or load weights on mechanical testing equipment, hardness tester, creep or stress rupture testers, and other material testers. The slots allow weights to be added onto a rod shape hanger. Load or force application can be increased or decreased by adding or removing weights. 
   Stackable Weight       Stackable weights are typically heavy weights constructed with stackable mating features. When a stackable weight is stacked on top of another stackable weight, legs on the top weight fit into indentation on the lower weight, which prevent the heavy weight from sliding or slipping off. 
   Wire Weight       Weights in the form of metal wires. Wire-shaped weights are typically used as calibration weights. Wire weights have very low denominations. 
   Specialty / Other       Other unlisted, proprietary, or specialized weight shape type. 
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   Weight Set?       Weights in the form of a kit containing weights in a range of weight denominations. Weight sets are often packaged in a protective plastic or wooden case and include gloves, weigh tweezers, weight handle or weigh forks for lifting and handling weights without altering their mass. The forks or handles are designed to grab onto knobs or other features on the calibration or test weights. 
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Class & Tolerance
   Class       
   Your choices are...         
   ASTM Class 0 / Ultra Class       Calibration weight is certified to ASTM E617 standards for ASTM class 0 or Ultra class weights. ANSI/ASTM Class 0 or Ultra Class weights provide the greatest precision. ASTM Class 0 weights are used as primary reference standards in calibrating other reference standards and weights. 
   ASTM Class 1       Calibration weight is certified to ASTM E617 standards for ASTM class 1 weights. ANSI/ASTM Class 1 weights are second in tolerance only to ANSI/ASTM Ultra Class weights. They provide great precision. ASTM Class 1 weights can be used as reference standards in calibrating other weights and high precision analytical balances with readabilities from 0.01mg to 0.1mg. 
   ASTM Class 2       Calibration weight is certified to ASTM E617 standards for ASTM Class 2 weights. ANSI/ASTM 2 Class weights are second in tolerance only to Class 1 weights. They provide a precision level suitable for calibrating high-precision top loading balances with readabilities ranging from 0.001g to 0.01g.  
   ASTM Class 3       Calibration weight is certified to ASTM E617 standards for ASTM Class 3 weights.  ANSI/ASTM 3 Class weights are second in tolerance only to Class 2 weights. They provide a precision level suitable for calibrating moderate precision balances with readabilities from 0.001g to 0.01g. ASTM Class 3 weights are not used to calibrate other weights or standard masses. 
   ASTM Class 4       Calibration weight is certified to ASTM E617 standards for ASTM class 4 weights. ANSI/ASTM 4 Class weights are second in tolerance only to Class 3 weights. They provide a precision level suitable for calibrating student balances and scales used in educational settings for semi-analytical weighing. ASTM Class 4 weights are not used to calibrate precision balances and other reference weights. 
   ASTM Class 5       Calibration weight is certified to ASTM E617 standards for ASTM class 5 weights. 
   ASTM Class 6       Calibration weight is certified to ASTM E617 standards for ASTM class 6 weights. An ANSI/ASTM Class 6 weight typically refers to student brass weights used as counterweights on mechanical balances. ANSI/ASTM Class 6 weights meet the specifications of OIML R 111 Class M2 weights. 
   ASTM Class 7       Calibration weight is certified to ASTM E617 standards for ASTM class 7 weights. ANSI/ASTM Class 7 weight have the lowest tolerance of ASTM Class weights. ASTM Class 7 weights are used in rough weighing operations in physical and chemical laboratories on applications such as load testing, proofing testing, mechanical testing, laboratory experimentation requiring load application, and on force measuring apparatus. 
   OIML Class E1       Calibration weight is certified to OIML R111 standards for OIML class E1 weights. OIML Class E1 weights have the highest tolerance of OIML Class weights. They provide the greatest precision. OIML Class E1 weights are used as primary reference standards in calibrating other reference standards and weights. 
   OIML Class E2       Calibration weight is certified to OIML R111 standards for OIML class E2 weights. E2 Weight standards are used by metrological services for calibration of other reference weights and precision analytical balances. 
   OIML Class F1       Calibration weight is certified to OIML R111 standards for OIML class F1 weights. F1 High precision weights for analytical balances 
   OIML Class F2       Calibration weight is certified to OIML R111 standards for OIML class F1 weights. F2 Test weights for the verification of laboratory balances 
   OIML Class M1       Calibration weight is certified to OIML R111 standards for OIML class M1 weights. OIML M1 Precision Weights for the verification of trade scales. The OIML Class M weights are economical weights for use in general laboratory, industrial, commercial, technical and educational applications. OIML Class M weights are typically fabricated from cast iron or brass.  
   OIML Class M2       Calibration weight is certified to OIML R111 standards for OIML class M2 weights. OIML M2 Trade Precision Weights are used as counterweights on mechanical balances. Student brass weights typically meet OIML Class 2 or ANSI/ASTM Class 6 weight specifications. The OIML Class M weights are economical weights for use in general laboratory, industrial, commercial, technical and educational applications. OIML Class M weights are typically fabricated from cast iron or brass. 
   OIML Class M3       Calibration weight is certified to OIML R111 standards for OIML class M3 weights. OIML Class 3 weights have the lowest tolerance of OIML class weights. The OIML Class M weights are economical weights for use in general laboratory, industrial, commercial, technical and educational applications. OIML Class M weights are typically fabricated from cast iron or brass. 
   NIST Class F       Calibration weight is certified to NIST standards for NIST Class F weights. NIST Class F weights are field standard weights used to test commercial scale and weighing devices by state and local weights and measures officials, device installers and service technicians.  NIST class F weights are adjustable through an adjusting cavity with a closure. Metal shot, preferably lead shot, is used to adjust the weight.  The following excerpt from the NIST Handbook 105-1 Specification and Tolerances for Reference and Field Standard Weights and Measures defines the scope of use, "A class F field stand weight (after this, simply called "weight") is intended to be used primarily to test commercial weighing devices for compliance with the requirements of NIST Handbook 44. Class F weights may be used to test most accuracy class III scales, all scale of class II L or IIII, and scales not marked with a class designation. 
   Other Metrology Class       Weight is certified to an unlisted, proprietary, foreign country or specialty metrology standard. 
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   Construction Type       
   Your choices are...         
   Type I (One-Piece)       Within the class designation system, weights also have a Type I and Type II designation. Type I weight standards have a single piece solid construction (Type I), which is non-adjustable. ASTM standards for scale calibration require that Type II reference weights are used in order to avoid modification or the weight standard. Buoyancy impact mass comparison, so density of the reference weight is important. Density can more easily be evaluated on single piece, solid weights. 
   Type II (Adjustable)       Type II weights may have a screw, knob, ring or sealed plug or feature that allows adjusting material to be added to or removed from the weight. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Calibration Certificate (NVLAP)?       The weight has a calibration certificate from a NVLAP, but not necessarily traceability to NIST or another national laboratory. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Traceable Certificate / Traceability Report?       The weight has a traceability report or traceable certificate, which means the weight, has traceability back to a NIST or national laboratory standard weight. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
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Materials
           
   Your choices are...         
   Aluminum       Weight manufactured from aluminum. Aluminum is a low density metal with good corrosion resistance. Aluminum is often anodized to enhance corrosion resistance. 
   Cast Iron       Weight manufactured from cast iron. Cast iron is a high-carbon ferrous alloy. 
   Concrete       Weight manufactured from concrete. 
   Brass       Weight manufactured from brass. Brass is a metal alloy of copper and zinc with good corrosion resistance. 
   Filled Polymer / Rubber       Weight manufactured from a filled polymer or rubber. 
   Granite / Stone       Weight manufactured from granite or stone. 
   Lead       Weight manufactured from lead. Lead is a very dense metal. 
   Molybdenum       Weight manufactured from molybdenum. Molybdenum is a very dense metal. 
   Sand / Gravel       Weight made from sand or gravel within a container such as a plastic bag or barrel. 
   Stainless Steel       Weight manufactured from stainless steel. Stainless steel is a metal with excellent corrosion resistance. 
   Steel       Weight manufactured from carbon or alloy steel. Steel usually requires a surface treatment or coating to prevent corrosion. 
   Tungsten       Weight manufactured from tungsten. Tungsten is a very dense metal. 
   Water       Weight made from water within a container such as a plastic bag or barrel. 
   Zinc       Weight manufactured from zinc. Zinc usually requires a surface treatment or coating to prevent corrosion. 
   Specialty / Other       Other unlisted, proprietary or specialized material of construction. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Non-magnetic?       Weight manufactured from a non-magnetic material. Magnetic fields can impact weight calibration and scale verifications in some cases. 
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