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Metric Class F

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Rice Lake Calibration Weights
Buy Rice Lakes weights per unit or in bulk. Browse Rice Lake calibration weights scales by model, weight or application. Order rice lake weights today for FAST worldwide shipping from Scales Galore. Rice Lake Weighing Systems is an international leader in the manufacture and distribution of weight-related products and process-control equipment. Within this ISO 9001 registered company, progressive new technologies merge with the wisdom of industry experience and create the future of weighing through cutting-edge research and design. More about Rice Lake
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Calibration Weights by Class

All Class F Weights are now at Class 5 Standards

Beginning January 1, 2020, Rice Lake Class F calibration weights will no longer be sold for legal metrology use. According to the newly updated NIST Handbook 105-1 (2019), new weights for use as field standards placed into service for weights and measures use after this date must comply with all of the requirements of NIST Handbook 105-1 (2019). In order to update our Class F inventory to bring it more in line with ASTM and OIML tolerances, all Rice Lake NIST Class F weights will become ASTM Class 5 weights. Part numbers and pricing will remain the same, but the tolerance will be tighter.

Note that existing NIST Class F calibration weights in the field are grandfathered in and may continue to be used for legal metrology use, but they must meet NIST Handbook 105-1 (1990) requirements. Although the new revision does supersede the 1990 version, it makes clear that existing Class F weights may continue to be used.

While existing NIST Class F calibration weights may be reclassified to one of the new specifications if all specifications and tolerances fully comply with the alternative standard, the NIST Office of Weights and Measures strongly recommends that you do not reclassify existing Class F weights due to the difficulty of performing compliance evaluation.

This change is taking place to accommodate for the increasing accuracy of weighing devices used for legal metrology. Class F weights are no longer sufficient for the calibration, inspection, or sealing of weighing devices used for the jewelry, marijuana and pharmaceutical industries. Similarly, hydrogen for hydrogen vehicles is being sold by weight, which demands a high level of accuracy.

Individual &
Weight Sets
Class 0

Class 0 Used as a primary reference for calibrating other reference standards and weights. Class 0 weights are intended to be used in metrology laboratories where the stability of the environment and careful handling are assured. Although very stable, one-piece construction Class 0 weights have no method of adjustment and are not suitable for general laboratory use. The uncertainty is guaranteed to be 1/3 the tolerance.

Individual &
Weight Sets
Class 1

Class 1 - Can be used as a reference standard in calibrating other weights and is appropriate for calibrating high-precision analytical balances with a readability as low as 0.1 mg to 0.01 mg.

Individual &
Weight Sets
Class 2

Class 2 - Appropriate for calibrating high-precision top loading balances with a readability as low as 0.01 g to 0.001 g.

Individual &
Weight Sets
Class 3

Class 3 - Appropriate for calibrating high-precision top loading balances with a readability as low as 0.01 g to 0.001 g.

Individual &
Weight Sets
Class 4

Class 4 - For calibration of semi-analytical balances and for student use..

Individual &
Weight Sets
Class 6

Class 6 - For rough weighing operations in physical and chemical laboratories, such as force ..

Individual &
Weight Sets
Class 7

Class 7 - For rough weighing operations in physical and chemical laboratories, such as force ..

Individual &
Weight Sets
Class F
Now Class 5

Class F - Now Class 5 - Primarily used to test commercial weighing devices by state and local weights and measures, device installers, and service technicians.

Individual
Weight Sets
Class E1

OIML Class E1 Weights manufactured to international recommendation, OIML R111 specifications would be used to calibrate Class I/II balances, balances accurate as 0.001mg, and as a laboratory standard. These classes are considered to be of extra-fine accuracy.

Individual
Weight Sets
Class E2

OIML Class E2 Weights manufactured to international recommendation, OIML R111 specifications would be used to calibrate Class I/II balances, balances accurate as 0.001mg, and as a laboratory standard. These classes are considered to be of extra-fine accuracy.

Individual
Weight Sets
Class F1

OIML Class F1 Suitable for use for traceability of OIML class F2 weights and lower; also with OIML accuracy class I weighing instruments. The maximum permissible error from nominal value at 1 kg is +5 mg. For the calibration of high accuracy class 2 balances.

Individual
Weight Sets
Class F2

OIML Class F2 Suitable for use for traceability of OIML class M1 weights and lower; also with OIML accuracy class II weighing instruments. Intended for use in high value commercial transactions such as gold and precious stones. The maximum permissible error from nominal value at 1 kg is +16 mg. Used as working standards for precision and analytical work, build-in weights, external weights to calibrate moderate precision balance

Individual
Weight Sets
Class M1

OIML Class M1 Suitable for use for traceability of OIML class M2 weights and lower; also with OIML accuracy class II weighing instruments. The maximum permissible error from nominal value at 1 kg is +50 mg.

Individual
Class M2

OIML Class M2 Suitable for use for traceability of OIML class M3 weights; also with OIML accuracy class III weighing instruments. Intended for use in normal commercial transactions where goods are sold by weight. The maximum permissible error from nominal value at 1 kg is +160 mg. Used for accuracy class III applications, industrial scales, dial scales, trip balances, platform scales

Calibration Weights by Type
Grip-handle	Cylindrical	Screw-knob	Leaf	Specialty	Weight Sets

Rice Lake Scales

Wheel Weighing Scales

Class 0 - Calibration Weights

1 mg - 50 kg

Metric
Class 0

2 g - 5 g

Essential Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Weight Sets
Class 0

Class 1 - Calibration Weights

Avoirdupois
Class 1

Avoirdupois
Class 1

Avoirdupois
Class 1

Metric
Class 1

Metric
Class 1

Metric
Class 1

Weight Sets
Class 1

Essential Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Weight Sets
Class 1

Class 1 - Can be used as a reference standard in calibrating other weights and is appropriate for calibrating high-precision analytical balances with a readability as low as 0.1 mg to 0.01 mg.

Class 2 - Calibration Weights

Avoirdupois
Class 2

Avoirdupois
Class 2

Avoirdupois
Class 2

Metric
Class 2

Metric
Class 2

Metric
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Weight Sets
Class 2

Class 2 - Appropriate for calibrating high-precision top loading balances with a readability as low as 0.01 g to 0.001 g.

Class 3 - Calibration Weights

Avoirdupois
Class 3

Avoirdupois
Class 3

Avoirdupois
Class 3

Metric
Class 3

Metric
Class 3

Metric
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Weight Sets
Class 3

Class 3 - Appropriate for calibrating high-precision top loading balances with a readability as low as 0.01 g to 0.001 g.

Class 4 - Calibration Weights

Avoirdupois
Class 4

Avoirdupois
Class 4

Avoirdupois
Class 4

Metric
Class 4

Metric
Class 4

Metric
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Weight Sets
Class 4

Class 4 - For calibration of semi-analytical balances and for student use..

Class 5 - Class F - Calibration Weights

0.01 lb - 10 lb

Avoirdupois
Class 5
Class F

10 lb - 50 lb

Avoirdupois
Class 5
Class F

1 mg - 5 kg

Metric
Class 5
Class F

5 kg - 30 kg

Metric
Class 5
Class F

0.2 lb, 0.3 lb, 4oz

Weight Sets
Class 5
Class F

1 lb

Weight Sets
Class 5
Class F

2 lb

Weight Sets
Class 5
Class F

5 lb

Weight Sets
Class 5
Class F

10 lb

Weight Sets
Class 5
Class F

5g - 50 g

Weight Sets
Class 5
Class F

100g

Weight Sets
Class 5
Class F

500 g

Weight Sets
Class 5
Class F

1 kg

Weight Sets
Class 5
Class F

2 kg

Weight Sets
Class 5
Class F

5 kg

Weight Sets
Class 5
Class F

Class 5 - Class F - Primarily used to test commercial weighing devices by state and local weights and measures, device installers, and service technicians. Note All Class F wieghts are now Class 5

Specialty Calibration Weights - Class 6 - Class 7 - Class F

20 lb - 3000 lb

Avoirdupois
Class 6
Class F

1000 lb - 2000 lb

Avoirdupois
Class 6
Class F

10 kg - 1000 kg

Metric
Class 6
Class F

0.005 - 500 ozt

Troy Ounce
Class F

0.1 - 20 dwt

Penny Weights
Class F

Grain
Class F

Cube
Class F

Metric Cube
Class F

Cube Sets
Class F

Ring
Class F

Metric Ring
Class F

1000 lb - 2000 lb

Fork Lift
Class 6

50 kg - 500 kg

Weight Cart
Class 6

0.001 lb - 0.005 lb

Dish Weights
Class 6

1/32 oz - 50 lb

Hook
Class 6

1g - 25 kg

Metric Hook
Class 6

5 lb, 3 kg
Individual Hangers
Class 7

4 oz - 10 lb Individual
Slotted
Class F

100 g - 5 kg Individual
Metric Slotted
Class F

1 lb - 5 lb
Interlocking
Hangers
Class 7

1/2 lb - 100 lb
Interlocking
Slotted
Class 6,7

500 g - 3 kg
Interlocking
Metric Hangers
Class 7

200 g - 20 kg
Interlocking
Metric Slotted
Class 6,7

Counterpoise Weights

7 oz - 21 oz

Fairbanks
Hangers
Class 7

50 lb - 1000 lb

Fairbanks
Round
Class 7

50 lb - 500 lb

Fairbanks
Square
Class 7

10 kg - 200 kg

Fairbanks
Hexagon
Class 7

14 oz

Toledo
Hangers
Class 7

100 lb - 500 lb

Toledo
Triangel
Class 7

7 oz - 16 oz

Howe
Hangers
Class 7

2 lb - 500 lb

Howe
Round
Class 7

Class 6 - Class 7 - For rough weighing operations in physical and chemical laboratories, such as force ..

Class E1 - Calibration Weights

Metric
Class E1

Weight Sets
Class E1

Weight Sets
Class E1

Weight Sets
Class E1

Weight Sets
Class E1

Weight Sets
Class E1

Weight Sets
Class E1

Weight Sets
Class E1

Class E2 - Calibration Weights

Metric
Class E2

Weight Sets
Class E2

Weight Sets
Class E2

Weight Sets
Class E2

Weight Sets
Class E2

Weight Sets
Class E2

Weight Sets
Class E2

Weight Sets
Class E2

Weight Sets
Class F1

Weight Sets
Class F1

Class F1 - Calibration Weights

Metric
Class F1

Weight Sets
Class F1

Weight Sets
Class F1

Weight Sets
Class F1

Weight Sets
Class F1

Weight Sets
Class F1

Weight Sets
Class F1

Weight Sets
Class F1

Weight Sets
Class F1

Weight Sets
Class F1

Class F2 - Calibration Weights

Metric
Class F1

Weight Sets
Class F2

Weight Sets
Class F2

Weight Sets
Class F2

Weight Sets
Class F2

Weight Sets
Class F2

Weight Sets
Class F2

Weight Sets
Class F2

Weight Sets
Class F1

Weight Sets
Class F1

Class M1 - Calibration Weights

Metric
Class M1

Weight Sets
Class M1

Weight Sets
Class M1

Weight Sets
Class M1

Grip-handle, NIST, ASTM, and OIML Classification

Cast Iron

Stainless Steel

10 - 50 lb
Class 1,2,3,4
Class 2
Class 3
Class 4

5 - 30 kg
Class 1,2,3,4
Class 2
Class 3
Class 4

STAINLESS STEEL GRIP HANDLE WEIGHTS Class F

5g - 30 kg
Class F

STAINLESS STEEL GRIP HANDLE WEIGHTS AVOIRDUPO

10 - 50 lb
Class F

Cylindrical, NIST, ASTM, and OIML Classification

Individual

Kits

Cylindrical Calibration Weights, ASTM Classification Class 1

0.05 lb - 10 lb
Class 1
Class 2
Class 3
Class 4

Rice Lake, ASTM Metric Class 1 Individual Calibration Weight

10 g - 5 kg
Class 1
Class 2
Class 3
Class 4

Rice Lake, 46083 ASTM Metric Class 0 Density 7.95 Individual Calibration Weight

1 g - 50 kg
Class 0

Stainless Steel Individual Cylindrica l0.05 oz - 10 l

0.05 oz - 10 lb
Class F

Stainless Steel Individual Cylindrical 1 g - 5kg

1 g - 5kg
Class F

Weight,CYL OIML M1 SST, Satin, Density 7.84

Class M1
Class M2

Weight,CYL OIML M2 SST, Satin, Density 7.84

Class M1

Weight Kit Class 1 ASTM SST Polished Density 7.84 Elec Bal Cal Wts

0.05 lb - 10lb
Class 1
Class 2
Class 3
Class 4

Weight Kit Class 1 ASTM SST Polished Density 7.84 Elec Bal Cal Wts Metric

10 g - 5 kg
Class 1
Class 2
Class 3
Class 4

Weight Kit Class 0 ASTM SST Polished Density 7.84 Elec Bal Cal Wts Metric

1 g - 50 kg
Class 0

Sets

4oz Models

1 lb Models

2 lb Models

5 lb Models

10 lb Models

50 g Models

100 g Models

500 g Models

1 kg Models

2 kg Models

5 kg Models

Screw-knob, ASTM Classification

Individual

Kits

Essential Sets

Sets

Weight,Screw Knob ASTM Class 1 SST Polished Density 7.95

1/16oz - 50lb
Class 1
Class 2
Class 3
Class 4

1g - 20kg
Class 1
Class 2
Class 3
Class 4

Weight Kit,Screw Knob ASTM Class 1 SST Polished Density 7.95

1/16oz - 30lb
Class 1
Class 2
Class 3
Class 4

1 g - 20 kg
Class 1
Class 2
Class 3
Class 4

Rice Lake ASTM Essential Weight Sets Screw Knob Class 1

Essential Class 1

2lb - 50lb
Class 1
Class 2
Class 3
Class 4

ASTM Sets

500mg
Class 0
Class 1
Class 2
Class 3
Class 4

20g
Class 0
Class 1
Class 2
Class 3
Class 4

50g
Class 0
Class 1
Class 2
Class 3
Class 4

100g
Class 0
Class 1
Class 2
Class 3
Class 4

200g
Class 0
Class 1
Class 2
Class 3
Class 4

200g
Class 1
Class 2
Class 3
Class 4

500g
Class 0
Class 1
Class 2
Class 3
Class 4

1kg
Class 0
Class 1
Class 2
Class 3
Class 4

2kg
Class 0
Class 1
Class 2
Class 3
Class 4

3kg-5kg
Class 0
Class 1
Class 2
Class 3
Class 4

10kg
Class 0
Class 1
Class 2
Class 3
Class 4

20kg-25kg
Class 0
Class 1
Class 2
Class 3
Class 4

Leaf Weights Stainless Steel, NIST,ASTM Classification

Individual			Kits		Sets

1 - 500 mg Class F	0.001 lb - 1/32 oz Class 1 Class 2 Class 3 Class 4	1 - 500 mg Class 0 Class 1 Class 2 Class 3 Class 4	1 - 500 mg Class 0 Class 1 Class 2 Class 3 Class 4	0.001 lb - 1/32 oz Class 1 Class 2 Class 3 Class 4	500mg Class 0 Class 1 Class 2 Class 3 Class 4

Specialty Weights

Cube
100g - 1000g
2 oz - 2 lb
Weight Sets

Ring
25g - 500g
1/4 oz - 5 lb

Weight,Leaf Troy NIST Class F SST Satin Density 7.95

Troy Ounce
0.005 ozt - 500 ozt

Weight,Leaf Pennyweight NIST Class F SST Satin Density 7.95

Pennyweight
0.1 dwt - 20 dwt

Weight,Leaf Grain NIST Class F SST Satin Density 7.95

Grain
1 GN - 20 GN

Weight,Slotted Slot Width NIST Class F SST Satin Density 7.84

Slotted
4 oz - 10 lb
100 g - 5 kg

Dish

Nesting Slab
1000 - 2500 lb

Lift Truck
1000 - 2000 lb

Weight Cart
50 - 500 kg

Slotted CAST IRON Interlocking Weights

CAST IRON Slotted Interlocking Weights Hangers

500 g - 2 kg
Hangers

200 g - 20 kg
Slotted Interlocking

1 - 5 lb
Hangers

1/2 - 100 lb
Slotted Interlocking

Counterpoise Weights

Fairbanks Hangers

Fairbanks Hexagon

AVOIRDUPOIS FAIRBANKS INTERLOCKING WEIGHTS

Fairbanks Square

Fairbanks Round

Toledo Hangers

Toledo Triangular

Howe Hangers

Howe Triangular

Individual - Hook Weights


Avoirdupois 1/32 oz - 50 lb		Metric 1 g - 25 kg

Rice Lake

About Rice Lake

Rice Lake Weighing Systems is an international leader in the manufacture and distribution of weight-related products and process-control equipment. Within this ISO 9001 registered company, progressive new technologies merge with the wisdom of industry experience and create the future of weighing through cutting-edge research and design.

There roots are planted firmly in the principles of quality and customer service. Through three generations of family ownership these ideals remain unchanged. Today, Rice Lake Weighing Systems is world renowned for delivering the highest standard of product and the best service in the weighing industry.

Rice Lake will continue there dedication to being the best by every measure, from community involvement to global commitment, and the promotion of ethical business practices that represent the values of our customers, our employees and our company

Rice Lake Company History

1940s In 1946, Donald B. Johnson and Warren Thomas opened the doors of Thomas & Johnson Scale Service in Saint Paul. The doors they opened were the garage doors belonging to Donald's father-in-law. In 1948, Thomas & Johnson Scale moved to Rice Lake, Wisconsin where there was a growing demand for scale service from creameries and cheese processing enterprises. Their founding principal remains the same today: "Take care of the customer and the rest of the business will take care of itself."

1950s In the late 1950s, scale dealers were in dire need of scale repair parts. Donald B. fostered the idea of refinishing old pivots and bearings so customers would not have to wait for new parts to be manufactured. He purchased a large quantity of WWII ammunition boxes and sent them to people he met at national scale conferences, offering to refinish any scale parts sent back in the ammunition boxes for fifty cents apiece. They were guaranteed a two- to three-day turnaround. Soon, word of this new approach to solving the parts shortage problem spread throughout the country.

1960s Thomas & Johnson published their first Pivot & Bearing Catalog displaying eighteen sizes of pivots and bearings and advertising a 35 percent savings compared to the same parts offered by the original manufacturer.

Donald B. opened his first National Conference hospitality suite. He welcomed everyone to the suite and treated them to Wisconsin cheese and sausage. Donald B.'s hospitality suite became a tradition at the National Conference and continues to be a welcoming destination today.

1970s In 1971 Thomas & Johnson Scale Service became Rice Lake Bearing, Inc.

In the mid 1970s, Donald B. saw that the United States was considering conversion to all metric measurements and realized his scale distributors would need new metric counterpoise weights. Always staying ahead of the curve, he began including test weights in the company repertoire. With an advanced metrology lab and expertise in the field, the company became a major supplier of precision test weights and recalibration.

1980s In 1981, Donald B. and his son, Mark Johnson, Sr., became the sole owners of Rice Lake Bearing.

During the 1980's, the Johnsons built on their company's position as a parts supplier to the weighing industry by including electronic parts and components in their catalog. They felt the same commitment made to the mechanical scale business should be made to the electronic scale industry. "Service, selection and speed" became a slogan the entire industry welcomed and depended on critical parts and components. In 1986, Rice Lake Bearing became Rice Lake Weighing Systems and strong application and engineering support set the bar for the entire industry.

1990s Rice Lake Weighing Systems became a world leader in weight related technology serving a wide spectrum of industries; Bulk Construction Materials, Chemical, Food & Beverage Processing, Timber, Pulp & Paper, Manufacturing, Packaging & Material Handling, Pharmaceuticals, Retail, Supply Chain Management, Transport & Logistics, Utilities & Waste. Rice Lake products and technology covered applications from basic weighing and data collection to on-line scale diagnostics and real-time monitoring, from recipe formulation to traceability systems, from truck management to inventory management, and beyond.

In 1996, Donald B. was awarded the prestigious Woody Woodland Memorial Award for his contribution to the scale industry.

2000 Rice Lake now offers over 35,000 weighing, control, data collection and communication products with over 1,000,000 items in stock and available for same- or next-day delivery.

Additional products manufactured and/or distributed by Rice Lake include the highest quality bench, crane, counting, and floor scales, remote displays, balances, printers, junction boxes and hardware.

Today Rice Lake Weighing Systems continues to lead the way in the development of new weighing and process control technologies. Rice Lake's corporate headquarters, metrology laboratory and main manufacturing plant remain in Rice Lake, Wisconsin, employing more than 400 employees. Additional manufacturing facilities are located in Jasper, Alabama, and Newtown, Connecticut.

Rice Lake Calibration Weights

Calibration Weights by Class

All Class F Weights are now at Class 5 Standards

Calibration Weights by Type

Grip-handle

Cylindrical

Screw-knob

Leaf

Specialty

Weight Sets

Rice Lake

About Rice Lake

Rice Lake Company History