Bearing Technical Principles

Technical principles

Rolling bearings Load carrying capacity and life Rigidity Friction and increases in temperature Speeds Lubrication Bearing data Design of bearing arrangements Fitting and dismantling Shaft guidance systems Load carrying capacity and life Friction Lubrication Design of bearing arrangements Operating clearance Fitting Track roller guidance systems Load carrying capacity and life Lubrication Design of bearing arrangements Fitting Accuracy Operating limits Monorail guidance systems Load carrying capacity and life INA calculation program Preload Friction Lubrication Special coatings Special materials Fitting variants Fitting

Rolling Bearing types

Precision, Miniature, and Stainless Steel Ball Bearing Products

Pacamor Kubar Bearings provides precision, miniature, instrument and stainless steel ball bearing options to satisfy any requirement. Technical expertise is available to assist with design engineering for custom products. Available options include, but are not limited to, custom rings, retainers, balls, shields, seals, lubricants, and packaging. You can be certain, whether our ball bearing is included in the Original Equipment Manufacturer's design or is installed in a high quality overhaul, the Pacamor Kubar Bearings name is one you can trust.

The following pages offer specific information pertaining to ball bearing design and specifications.

		Miniature and Instrument Stainless Steel Bearings Stainless steel (440C) precision miniature & instrument ball bearings in standard inch sizes and various metric sizes are manufactured at our Troy, NY production facility. A variety of special features, including, but not limited to, flanges, modified dimensions, and duplex designs are offered.
		Precision and Commercial Bearings PRECISION, RELIABILITY, AND VALUE, attributes you expect in quality precision instrument ball bearings. At Pacamor Kubar Bearings, we are committed to delivering quality product, on time, and at competitive prices. With over forty years of miniature and instrument expertise, chances are you've been relying on PKB instrument bearings in many of the products you use everyday.
		Metric Bearings To complement our broad range of 440C stainless steel precision miniature & instrument ball bearings in standard inch sizes, we offer a select series of metric ball bearings, also manufactured at our Troy, NY production facility. A variety of special features, including: flanges, modified dimensions, and duplex designs are offered in all types of metric ball bearings.
		Specialty Bearings In addition to our broad range of precision miniature & instrument stainless steel ball bearings in standard inch sizes as well as a select series of metric ball bearing sizes, Pacamor Kubar Bearings has specialty options not presented in any of our catalogs. A variety of special features, including: flanges, modified dimensions, and duplex designs are offered. Optional retainer and ball materials, coatings, and shield designs are available to meet the specific requirements of your application.

Industries Served by PKB Ball Bearing Manufacturer

Pacamor Kubar Bearings (PKB) is a ball bearing manufacturer you can trust when looking for bearings for commercial, industrial, aerospace, military, medical, and dental applications. From simple fishing reels to advanced aircraft guidance instrumentation and everything in between, you can be confident of the products produced by this top of the line ball bearing manufacturer.

Surgeons and dentists rely on Pacamor Kubar Bearings in life saving and life enhancing operations. Military and commercial pilots rely on Pacamor Kubar Bearings to get them where they need to be when they need to get there. U.S. industry relies on our company�s ball bearings in flow meters, robotics, and all sorts of manufacturing machinery. Whether our bearing is a single component in an oil well drilling device or the bearing in your fishing reel, the Pacamor Kubar Bearings name is one ball bearing manufacturer you can trust.

The following pages offer an overview of the industries Pacamor Kubar Bearings manufactures ball bearings for:

Industrial and Computers

QUALITY, RELIABILITY, DELIVERY, AND VALUE, what you expect from a preferred ball bearing manufacturer. Your company demands that every product launch or product upgrade be completed on time and within budget. At Pacamor Kubar Bearings, we are committed to partnering with you to satisfy all your requirements.

Consumer Applications

THERE WHEN YOU NEED IT. PKB offers over forty years of miniature and instrument bearing expertise. If you fish, cook, clean, or play video games on your computer, chances are you've relied on Pacamor Kubar Bearings to run your hard drive, turn a drill bit, or even pull in that evasive big fish. With Pacamor Kubar Bearings installed in your products, you can be confident that your high precision device contains high quality, reliable, and domestically produced components.

Aerospace and Aircraft

Aerospace and aircraft ball bearings are not always easily accessible for routine maintenance, but must perform flawlessly. With Pacamor Kubar Bearings miniature ball bearings installed in your aircraft or aerospace system, you can be confident that your high precision aeronautical and space systems contain high quality and reliable components. And, since PKB is an American owned and operated ball bearing manufacturer based in Troy, NY, all of our bearings are domestically produced

Government, Military and Guidance

INSTRUMENTS THAT MEASURE DIRECTION, ALTITUDE AND SPEED must be 100% accurate at all times. They instill the confidence required to safely get you where you need to be when you need to be there. With Pacamor Kubar Bearings radial ball bearings installed in your guidance and navigation system, you can be confident that your high precision aeronautical instruments contain high quality and reliable components. As an American owned and operated company, PKB is a ball bearing manufacturer based in Troy, NY who only manufactures domestically produced components.

Read more: http://www.pacamor.com/industries_served/index.php#ixzz2ErRiizOd

Bearing Technical Data

PACAMOR KUBAR BEARINGS has technical expertise available to assist with design engineering for custom products. Available options include, but are not limited to, custom rings, retainers, balls, shields, seals, lubricants, and packaging. Whether our bearing is included in the Original Equipment Manufacturer's design or is installed in a high quality overhaul, the PACAMOR KUBAR BEARINGS name is one you can trust.

The following pages contain specific technical data and calculations to aid you in bearing selection and/or bearing design.

Abec Tolerances

PACAMOR KUBAR BEARINGS are manufactured to standard grades of precision with established tolerances for size and geometric accuracy. These standards are known as ABEC classes as set by the Annular Bearing Engineers Committee of the American Bearing Manufacturer's Association (ABMA)...

Lubrication

Operational conditions such as temperature, loads, speed, torque, and environment will determine the appropriate lube for the application. Oils are used where low bearing friction torque is a primary consideration. Grease may provide longer operating life and resist lubricant loss due to centrifugal force at higher speeds. PACAMOR KUBAR BEARINGS Engineers are available for design consultation and recommendations...

Life & Load Calculations

The following formulas permit the calculation of the fatigue life of bearings subjected to radial loads or combined radial and axial loads. Some of the formulas include approximations. Contact PACAMOR KUBAR BEARINGS Engineering Department if the calculated life is borderline in comparison to the desired life or if the loading conditions differ from those presented...

Shaft & Housing Fits

Line to Line to slightly loose shaft and housing fits are desirable for most applications. Interference fits may be necessary to prevent one bearing ring from turning relative to its mating part under heavy loads or when cycle vibration is present. An interference fit causes a 50-80% loss in radial play. The contact angle of a radial bearing under axial load is related to the radial play remaining in the bearing after installation...

Radial Play

Radial play is the radial internal looseness between the balls and races. It is the measured value of the total movement of one ring with respect to the other in a plane perpendicular to the bearing axis. Radial play is not related to the ABEC class or quality of the bearing. Factors that require control of radial play are speeds, loads, thermal conditions, mounting fits, along with axial motion and deflection rates...

Recommended Shoulder Dimensions

Minimum and maximum shoulder dimensions for optimum shaft and housing fits of miniature and instrument ball bearings.

Installation

At no time can any installation forces be transmitted from one bearing ring to the other through the balls. Incorrect installation can cause brinneling of the bearing balls, which can result in bearing vibration, noise, and reduced life When installing a bearing on a tight shaft, force is be applied to the inner ring ONLY. When installing a bearing in a tight housing, force is be applied to the outer ring ONLY. Force may be applied only to the ring that is being mounted...

Bore and OD Codes

Miniature and Instrument ball bearings inner and outer diameters can be further calibrated to very specific size ranges by denoting their applicable dimensional codes.

Design Data

Specific internal data on miniature and instrument ball bearings including ball complement and size, land diameters, and retainer styles.

Nomenclature

Description of PACAMOR KUBAR BEARINGS part numbering system and methodology for identifying a PKB part number.

Bearing Cross Reference

This ball bearing cross reference is a guide for interchanging ball bearing part numbers among ball bearing manufacturers. This bearing cross reference is offered as a guide only, as manufacturers change ball bearing nomenclature occasionally. Therefore, the guide is offered to assist in the bearing cross reference process but not as a final and complete ball bearing interchange...

For further assistance with bearing selection and design, please feel free to contact our engineering team, look at our online catalog . or chat with a company representative right now!

Bearing Product data

	Rolling bearings
	High-/super-precision bearings
	Bearing units
	Housings
	Spherical plain bearings and rod ends
	Composite dry sliding bushings and FW bushings
	Industrial shaft seals
	Hydraulic seals
	Coupling systems

BEARING TOLERANCES

RADIAL BEARINGS - METRIC (Except Metric Tapered Roller Bearings)

Outer Ring
Nominal O.D.			Outside Diameter Tolerances					Width Tolerances				Radial
Diameter												Runout
(Metric)					(Inch)			(Inch)				(Inch)
D				Dm					B
Over	Incl.		High		Low			Maximum		Minimum		Maximum
Tolerance Class - STANDARD (ABEC-1)
6	18		+.0000		-.0003							.0006
18	30		+.0000		-.00035			Tolerances are identicalto those of inner ring of the the same bearing				.0006
30	50		+.0000		-.0004							.0008
50	80		+.0000		-.0005							.0010
80	120		+.0000		-.0006							.0014
120	150		+.0000		-.0007							.0016
150	180		+.0000		-.0010							.0018
180	250		+.0000		-.0012							.0020
250	315		+.0000		-.0014							.0024
315	400		+.0000		-.0016							.0028
400	500		+.0000		-.0018							.0032
500	630		+.0000		-.0020							.0039
630	800		+.0000		-.00295							.0047
800	1000		+.0000		-.0039							.0047
Outer Ring
Nominal O.D.			Outside Diameter Tolerances					Width Tolerances				Radial
Diameter												Runout
(Metric)					(Inch)			(Inch)				(Inch)
D				Dm					B
Over	Incl.		High		Low			Maximum		Minimum		Maximum
Tolerance Class - P/6 (ABEC-3)
6	18		+.0000		-.0003			Tolerances are identicalto those of inner ring of the the same bearing				.0003
18	30		+.0000		-.0003							.00035
30	50		+.0000		-.00035							.0004
50	80		+.0000		-.0004							.0005
80	120		+.0000		-.0005							.0007
120	150		+.0000		-.0006							.0008
150	180		+.0000		-.0007							.0009
180	250		+.0000		-.0008							.0010
250	315		+.0000		-.0010							.0012
315	400		+.0000		-.0011							.0014
400	500		+.0000		-.0013							.0016
500	630		+.0000		-.0015							.0020
630	800		+.0000		-.0018							.0024
Outer Ring
Nominal O.D.			Outside Diameter Tolerances					Width Tolerances				Radial
Diameter												Runout
(Metric)					(Inch)			(Inch)				(Inch)
D				Dm					B
Over	Incl.		High		Low			Maximum		Minimum		Maximum
Tolerance Class - P/5 (ABEC-5)
6	18		+.0000		-.0002			Tolerances are identicalto those of inner ring of the the same bearing				.0002
18	30		+.0000		-.00025							.00025
30	50		+.0000		-.0003							.0003
50	80		+.0000		-.00035							.0003
80	120		+.0000		-.0004							.0004
120	150		+.0000		-.0004							.0004
150	180		+.0000		-.0005							.0005
180	250		+.0000		-.0006							.0006
250	315		+.0000		-.0007							.0007
315	400		+.0000		-.0008							.0007
400	500		+.0000		-.0009							.0009
500	630		+.0000		-.0011							.0010
630	800		+.0000		-.0014							.0012
Outer Ring
Nominal O.D.			Outside Diameter Tolerances					Width Tolerances				Radial
Diameter												Runout
(Metric)					(Inch)			(Inch)				(Inch)
D				Dm					B
Over	Incl.		High		Low			Maximum		Minimum		Maximum
Tolerance Class - P/4 (ABEC-7)
6	18		+.0000		-.00015			Tolerances are identicalto those of inner ring of the the same bearing				.0001
18	30		+.0000		-.0002							.00015
30	50		+.0000		-.00025							.0002
50	80		+.0000		-.0003							.0002
80	120		+.0000		-.0003							.00025
120	150		+.0000		-.00035							.0003
150	180		+.0000		-.0004							.0003
180	250		+.0000		-.0004							.0004
250	315		+.0000		-.0005							.0004
315	400		+.0000		-.0006							.0005
Outer Ring
Nominal O.D.			Outside Diameter Tolerances					Width Tolerances				Radial
Diameter												Runout
(Metric)					(Inch)			(Inch)				(Inch)
D				Dm					B
Over	Incl.		High		Low			Maximum		Minimum		Maximum
Tolerance Class - P/4S (ABEC-7-SPECIAL)
6	18		+.0000		-.00015			Tolerances are identicalto those of inner ring of the the same bearing				.000059
18	30		+.0000		-.00019							.000099
30	50		+.0000		-.00024							.000099
50	80		+.0000		-.00027							.00019
80	120		+.0000		-.00032							.00019
120	150		+.0000		-.00035							.00019
150	180		+.0000		-.00039							.00027
180	250		+.0000		-.00043							.00027
250	315		+.0000		-.00051							.00031
315	400		+.0000		-.00059							.00035