what size to bore for press fit bearings

As described in Department 9-3, the characteristics / magnitude of the bearing load, temperature, mounting / dismounting methods and other conditions must be considered to choose proper fits.
Past experience is also valuable.
Tabular array 9-3 shows standard fits for the metric series bearings; Tables 9-iv to nine-eight tabulate the most typical and recommended fits for dissimilar bearings types.
『Table 9-4 (1) Recommended shaft fits for radial bearings (classes 0, 6X, vi)』
『Table 9-4 (2) Recommended housing fits for radial bearings (classes 0, 6X, 6)』
『Tabular array 9-five (1) Recommended shaft fits for precision extra-small/miniature brawl bearings (d＜10mm)』
『Table ix-5 (2) Recommended housing fits for precision extra-small-scale/miniature ball bearings (D≦30mm)』
『Tabular array 9-half-dozen (1) Recommended shaft fits for metric J series tapered roller bearings』
『Table 9-vi (2) Recommended housing fits for metric J series tapered roller bearings』
『Table ix-7 (i) Recommended shaft fits for inch series tapered roller bearings』
『Tabular array 9-7 (two) Recommended housing fits for inch series tapered roller bearings』
『Table 9-viii (1) Recommended shaft fits for thrust bearings (classes 0, 6)』
『Tabular array 9-eight (2) Recommended housing fits for thrust bearings (classes 0, vi)』

Table 9-3 Standard fits for metric series bearings^1）

(1) Fits for bore diameter ^2） of radial bearings

Grade of begetting	Rotating inner ring load or indeterminate direction load							Stationary inner ring load
	Class of shaft tolerance range
Classes 0, 6X, 6	r 6	p 6	n 6	m vi	k half dozen	js 6	h 5	h 6	g 6	f vi
				m 5	k 5	js 5		h 5	thousand v
Class 5	-	-	-	m 5	m 4	js four	h 4	h v	-	-
Fit	Interference fit					Transition fit				Clearance fit

(2) Fits for outside bore ^2） of radial bearings

Class of bearing	Stationary outer ring load				Indeterminate direction load or rotating outer ring load
	Grade of housing bore tolerance range
Classes 0, 6X, 6	1000 7	H 7	JS 7	-	JS 7	K seven	M seven	N seven	P 7
		H 6	JS half dozen		JS 6	G vi	M 6	N 6
Class v	-	H v	JS v	Grand 5	-	Thousand v	Thou 5	-	-
Fit	Clearance fit		Transition fit						Interference fit

(3) Fits for bore diameter ^ii） of thrust bearings

Course of bearing	Cardinal axial load (generally for thrust bearings)		Combined load (in the case of spherical thrust roller bearing)
			Rotating shaft race load or indeterminate direction load			Stationary shaft race load
	Class of shaft tolerance range
Classes 0, vi	js 6	h vi	n 6	m 6	k 6	js 6
はめあい	Transition fit		Interference fit			Transition fit

(4) Fits for outside diameter ^two） of thrust bearings

Class of bearing	Key axial load (generally for thrust bearings)		Combined load (in the case of spherical thrust roller bearing)
			Stationary housing race load or indeterminate direction load			Rotating housing race load
	Class of housing bore tolerance range
Classes 0, half-dozen	-	H eight	G vii	H 7	JS 7	K 7	M 7
Fit	Clearance fit				Transition fit

[Notes]
1) Bearings specified in JIS B 1512
2) Follow JIS B 1514-1 and 1514-2 for tolerance.

Table 9-iv (one) Recommended shaft fits for radial bearings (classes 0, 6X, 6)

Weatherane）		Ball bearing		Cylindrical roller begetting Tapered roller begetting		Spherical roller bearing		Class of shaft tolerance range	Remarks	Applicationsv(for reference)
		Shaft bore (mm)
		over	up to	over	upwards to	over	upwards to
Cylindrical bore bearing (classes 0, 6X, half dozen)
Rotating inner ring load or indeterminate direction load	Light load or fluctuating load	-	eighteen	-	-	-	-	h five	For applications requiring loftier accuracy, js 5,k 5 and grand 5 should be used in place of js 6, k half dozen and k half dozen.	Electric appliances, automobile tools, pumps, blowers, carriers etc.
		18	100	-	40	-	-	js 6
		100	200	40	140	-	-	one thousand 6
		-	-	140	200	-	-	m vi
	Normal load	-	xviii	-	-	-	-	js 5	For single-row tapered roller bearings and angular contact brawl bearings, k 5 and m 5 may be replaced by k 6 and chiliad vi, because internal clearance reduction due to fit demand non be considered.	Electric motors, turbines, internal combustion engines, woodworking machines etc.
		xviii	100	-	forty	-	40	k 5
		100	140	40	100	twoscore	65	m 5
		140	200	100	140	65	100	m 6
		200	280	140	200	100	140	due north 6
		-	-	200	400	140	280	p vi
		-	-	-	-	280	500	r six
	Heavy load or affect load	-	-	50	140	50	100	north 6	Bearings with larger internal clearance than standard are required.	Railway rolling stock beam journals, traction motors
		-	-	140	200	100	140	p half-dozen
		-	-	200	-	140	200	r half dozen
Stationary inner ring load	Inner band needs to move smoothly on shaft.	All shaft diameters						g half dozen	For applications requiring high accuracy, chiliad 5 should be used. For big size bearing, f half-dozen may be used for easier movement.	Stationary shaft wheels
	Inner ring does non need to movement smoothly on shaft.	All shaft diameters						h 6	For applications requiring high accuracy, h 5 should exist used.	Tension pulleys, rope sheaves etc.
Primal axial load only		All shaft diameters						js 6	-	-
Tapered diameter bearing (grade 0) (with adapter or withdrawal sleeve)
All loads		All shaft diameters						h nine/Information technology 5 2）	For manual shafts, h10/IT7two） may be applied.

[Notes]
1) Light, normal, and heavy loads refer to those with dynamic equivalent radial loads (P _r) of v % or lower, over five % up to x % inclusive, and over 10 % respectively in relation to the basic dynamic radial load rating (C _r) of the bearing concerned.

2) IT 5 and It 7 mean that shaft roundness tolerance, cylindricity tolerance, and other errors in terms of shape should be within the tolerance range of IT v and Information technology 7, respectively. For numerical values for standard tolerance grades Information technology v and It vii, refer to supplementary table at cease of this catalog.

[Remark]This table is applicative to solid steel shafts.

Table 9-four (2) Recommended housing fits for radial bearings (classes 0, 6X, half dozen)

Conditions				Class of housing diameter tolerance range	Remarks	Applications (for reference)
Housing	Load type etc.１）		Outer ring axial deportation２）
One-slice or split blazon	Stationary outer ring load	All load types	Hands displaceable	H 7	G seven may exist applied when a big size bearing is used, or if the temperature deviation is large between the outer ring and housing.	Ordinary begetting devices, railway rolling stock axle boxes, power transmission equipment etc.
		Light or normal load	Easily displaceable	H 8	-
		High temperature at shaft and inner ring	Easily displaceable	One thousand 7	F 7 may be applied when a large size bearing is used, or if the temperature departure is large between the outer ring and housing.	Drying cylinders etc.
One-piece blazon		Low-cal or normal load, requiring high running accuracy	Not displaceable in principle	1000 6	Mainly applied to roller bearings.
			Displaceable	JS 6	Mainly applied to ball bearings.
		Requiring low-racket rotation	Easily displaceable	H six	-
	Indeterminate direction load	Low-cal or normal load	Normally displaceable	JS 7	For applications requiring high accuracy, JS half-dozen and K 6 should be used in place of JS 7 and K 7.	Electrical motors, pumps, crankshaft main bearings etc.
		Normal or heavy load	Not displaceable in principle	K 7
		High bear on load	Not displaceable	M7	-	Traction motors etc.
	Rotating outer ring load	Calorie-free or fluctuating load	Non displaceable	M7	-	Conveyor rollers, ropeways, tension pulleys etc.
		Normal or heavy load	Not displaceable	N7	Mainly applied to ball bearings.	Cycle hubs with brawl bearings etc.
		Thin department housing, heavy or high affect load	Non displaceable	P7	Mainly applied to roller bearings.	Wheel hubs with roller bearings, bearings for large end of connecting rods etc.

[Notes]
1) Loads are classified as stated in Annotation 1) to Table 9-4 (1).
ii) Indicating distinction betwixt applications of non-separable bearings permitting and not permitting axial displacement of the outer rings.

[Remarks]
1. This table is applicable to cast iron or steel housings.
2. If only central axial load is applied to the bearing, select such tolerance range class as to provide clearance in the radial direction for outer ring.

Table ix-5 (1) Recommended shaft fits for precision extra-small/miniature brawl bearings (d＜10mm)

Unit of measurement : μm

Load type		Bearing tolerance class	Unmarried plane mean bore diameter deviationΔ dmp		Shaft bore dimensional tolerance		Fit１）	Applications
			upper	lower	upper	lower
Rotating inner ring load	Middle/high speed Calorie-free or normal load	ABMA5P	0	－five.1	＋2.v	－two.5	7.6T～ii.5L	Gyro rotors, air cleaners, electric tools, encoders
		JIS class 5	0	－v			seven.5T～2.5L
		ABMA7P	0	－5.1	＋2.5	－2.v	7.6T～2.5L
		JIS course 4	0	－four			half-dozen.5T～2.5L
	Low speed Light load	ABMA5P	0	－5.1	－2.5	－seven.five	ii.6T ～seven.5L	Gyro gimbals, synchronizers, servomotors, floppy disc spindles
		JIS class v	0	－5			2.5T～7.5L
		ABMA7P	0	－5.ane	－two.v	－7.v	2.6T～7.5L
		JIS course iv	0	－four			one.5T～7.5L
Rotating outer ring load	Low to high speed Light load	ABMA5P	0	－5.1	－2.5	－7.five	2.6T～7.5L	Compression rolls, tape guide rollers, linear actuators
		JIS form 5	0	－5			2.5T～7.5L
		ABMA7P	0	－5.1	－2.5	－7.v	two.6T～7.5L
		JIS class v	0	－4			1.5T ～seven.5L

[Note]1) Symbols T and L means interference and clearance respectively.

Table 9-5 (2) Recommended housing fits for precision actress-small/miniature ball bearings (D≦30mm)

Unit：µm

Load type		Bearing tolerance class	Single airplane mean outside diameter deviationΔ dmp		Housing bore diameter dimensional tolerance		Fit１）	Applications
			upper	lower	upper	lower
Rotating inner band load	Center/high speed Light or normal load	ABMA 5P	0	－5.1	＋5	0	0～10.1L	Gyro rotors, air cleaners, electric tools, encoders
		ABMA 7P
		JIS class 52）	0	－v	＋5	0	0～ten L
			0	－six			0～11 L
		JIS grade 4ii）	0	－4	＋5	0	0～ 9 L
			0	－5			0～x L
	Low speed Light load	ABMA 5P	0	－5.ane	＋two.5	－ii.5	2.5T～7.6L	Gyro gimbals, synchronizers, servomotors, floppy disc spindles
		ABMA 7P
		JIS class fiveii）	0	－5	＋2.5	－2.5	two.5T～7.5L
			0	－6			2.5T ～8.5L
		JIS class iv2）	0	－4	＋2.5	－2.five	2.5T～6.5L
			0	－5			2.5T～vii.5L
Rotating outer ring load	Rotating outer ring load	ABMA 5P	0	－5.1	＋2.5	－2.5	two.5T～7.6L	Pinch rolls, record guide rollers
		ABMA 7P
		JIS class v2）	0	－five	＋2.5	－ii.five	ii.5T～vii.5L
			0	－half dozen			2.5T～8.5L
		JIS course 42）	0	－iv	＋two.5	－2.v	two.5T～vi.5L
			0	－v			2.5T～vii.5L

[Notes]
ane) Symbols T and L ways interference and clearance respectively.
2) In the columns "single plane mean outside diameter deviation" and "fit" upper row values are applied in the case of D≦18mm, lower row values in the case of eighteen < ＜D≦30mm.

Table ix-6 (1) Recommended shaft fits for metric J series tapered roller bearings

Bearing tolerance : class PK, class PN

Load type		Nominal bore diameter d mm		Course of shaft tolerance range	Remarks
		over	upwardly to
Rotating inner ring load	Normal load	ten	120	m 6
		120	500	n 6
	Heavy load Touch on load High speed rotation	10	120	n 6	Generally, bearing internal clearance should exist larger than standard.
		120	180	p 6
		180	250	r six
		250	500	r 7
Rotating outer ring load	Normal load without impact	80	315	h 6 or grand half dozen
	Heavy load Impact load Loftier speed rotation	10	120	n 6	More often than not, bearing internal clearance should be larger than standard.
		120	180	p 6
		180	250	r half-dozen
		250	500	r 7

Bearing tolerance : class PC, class PB

Load type		Nominal diameter diameter d mm		Class of shaft tolerance range		Remarks
				(bearing tolerance class)
		over	up to	PC	Pb
Rotating inner ring load	Spindles of precision machine tools	10	315	k five	one thousand v
		315	500	k five	-
	Heavy load Impact load High speed rotation	10	xviii	m 6	m 5	Generally, begetting internal clearance should exist larger than standard.
		xviii	50	m five	m 5
		fifty	80	due north 5	north v
		80	120	n 5	n 4
		120	180	p 4	p 4
		180	250	r 4	r iv
		250	315	r 5	r 4
		315	500	r v	-
Rotating outer ring load	Spindles of precision machine tools	ten	315	k five	k 5
		315	500	k v	-

Table 9-half dozen (two) Recommended housing fits for metric J series tapered roller bearings

Bearing tolerance : class PK, course PN

Load type		Nominal outside diameter d mm		Grade of housing diameter diameter tolerance range	Remarks
		over	up to
Rotating inner ring load	Used for free or stock-still side	18	315	G 7	Outer ring is easily displaceable in axial direction.
		315	400	F six
	Position of outer band is adjustable (in axial direction)	eighteen	400	J 7	Outer ring is displaceable in axial direction.
	Position of outer ring is not adjustable (in axial management)	18	400	P seven	Outer ring is stock-still in axial direction.
Rotating outer ring load	Position of outer ring is not adjustable (in axial management)	eighteen	120	R 7	Outer band is fixed in centric direction.
		120	180
		180	400

Bearing tolerance : class PC, course PB

Load blazon		Nominal outside bore d mm		Class of housing bore diameter tolerance range		Remarks
				(bearing tolerance grade)
		over	up to	PC	PB
Rotating inner ring load	Used for free side	18	315	Yard 5	G 5	Outer ring is easily displaceable in axial direction.
		315	500	M five	-
	Used for fixed side	18	315	H v	H 4	Outer ring is displaceable in axial direction.
		315	500	H v	-
	Position of outer ring is adaptable (in axial direction)	eighteen	120	K 5	K 5	Outer ring is fixed in axial direction.
		120	180	JS half-dozen	JS 6
		180	250	JS 6	JS five
		250	315	Yard 5	JS 5
		315	500	K 5	-
	Position of outer band is not adjustable (in axial direction)	xviii	315	N 5	Yard 5	Outer ring is fixed in axial direction.
		315	500	N 5	-
Rotating outer band load	Position of outer ring is not adaptable (in axial direction)	18	250	North 6	Due north v	Outer band is fixed in axial direction.
		250	315	Due north 5	N 5
		315	500	N five	-

Table 9-vii (1) Recommended shaft fits for inch series tapered roller bearings

Bearing tolerance : class four, course 2

Load type		Nominal outside diameter d mm（1/25.iv）		Difference of a single diameter diameter Δ ds , µm		Dimensional tolerance of shaft diameter µm		Remarks
		over	upward to	upper	lower	upper	lower
Rotating inner ring load	Normal load	-	76.2（3.0）	＋13	0	＋38	＋25
		76.2（three.0）	304.8（12.0）	＋25	0	＋64	＋38
		304.8（12.0）	609.6（24.0）	＋51	0	＋127	＋76
		609.6（24.0）	914.4（36.0）	＋76	0	＋190	＋114
	Heavy load Bear upon load Loftier speed rotation	-	76.2（three.0）	＋xiii	0	Should exist such that boilerplate interference stands at 0.0005×d（mm）		By and large, bearing internal clearance should be larger than standard.
		76.ii（3.0）	304.viii（12.0）	＋25	0
		304.viii（12.0）	609.half-dozen（24.0）	＋51	0
		609.6（24.0）	914.4（36.0）	＋76	0
Rotating outer ring load	Normal load without touch on	-	76.2（3.0）	＋13	0	＋xiii	0
		76.ii（iii.0）	304.8（12.0）	＋25	0	＋25	0
		304.viii（12.0）	609.6（24.0）	＋51	0	＋51	0
		609.half-dozen（24.0）	914.iv（36.0）	＋76	0	＋76	0
	Normal load without bear upon	-	76.2（3.0）	＋13	0	0	－13	Inner band is displaceable in centric direction.
		76.two（3.0）	304.8（12.0）	＋25	0	0	－25
		304.8（12.0）	609.six（24.0）	＋51	0	0	－51
		609.half dozen（24.0）	914.4（36.0）	＋76	0	0	－76
	Heavy load Impact load High speed rotation	-	76.2（3.0）	＋13	0	Should exist such that average interference stands at 0.0005×d（mm）		By and large, bearing internal clearance should be larger than standard.
		76.2（3.0）	304.8（12.0）	＋25	0
		304.8（12.0）	609.vi（24.0）	＋51	0
		609.six（24.0）	914.4（36.0）	＋76	0

Begetting tolerance : form iii, form 0^1）

Load blazon		Nominal exterior bore d mm（1/25.4）		Deviation of a unmarried bore diameter Δ ds , µm		Dimensional tolerance of shaft diameter µm		Remarks
		over	up to	upper	lower	upper	lower
Rotating inner band load	Spindles of precision machine tools	-	76.2（3.0）	＋xiii	0	＋30	＋18
		76.two（iii.0）	304.8（12.0）	＋13	0	＋30	＋18
		304.eight（12.0）	609.6（24.0）	＋25	0	＋64	＋38
		609.6（24.0）	914.4（36.0）	＋38	0	＋102	＋64
	Heavy load Impact load High speed rotation	-	76.two（3.0）	＋13	0	Should be such that average interference stands at 0.0005×d（mm）		Generally, bearing internal clearance should exist larger than standard.
		76.2（iii.0）	304.8（12.0）	＋13	0
		304.eight（12.0）	609.6（24.0）	＋25	0
		609.6（24.0）	914.4（36.0）	＋38	0
Rotating outer ring load	Spindles of precision machine tools	-	76.2（3.0）	＋xiii	0	＋30	＋xviii
		76.2（3.0）	304.8（12.0）	＋13	0	＋30	＋18
		304.viii（12.0）	609.half-dozen（24.0）	＋25	0	＋64	＋38
		609.6（24.0）	914.4（36.0）	＋38	0	＋102	＋64

[Note]ane) Form 0 bearing : d≦304.8mm

Tabular array ix-7 (2) Recommended housing fits for inch series tapered roller bearings

Bearing tolerance : class 4, grade two

Load type		Nominal outside diameter D mm（one/25.iv）		Deviation of a single outside bore Δ Ds , µm		Dimensional tolerance of housing bore diameter µm		Remarks
		over	up to	upper	lower	upper	lower
Rotating inner ring load	Used for free or fixed side.	-	76.2（3.0）	＋25	0	＋76	＋51	Outer ring is hands displaceable in axial management.
		76.2（3.0）	127.0（5.0）	＋25	0	＋76	＋51
		127.0（5.0）	304.8（12.0）	＋25	0	＋76	＋51
		304.eight（12.0）	609.6（24.0）	＋51	0	＋152	＋102
		609.6（24.0）	914.four（36.0）	＋76	0	＋229	＋152
	Position of outer ring is adjustable (in axial direction).	-	76.ii（3.0）	＋25	0	＋25	0	Outer band is displaceable in axial direction.
		76.2（3.0）	127.0（5.0）	＋25	0	＋25	0
		127.0（5.0）	304.8（12.0）	＋25	0	＋51	0
		304.eight（12.0）	609.six（24.0）	＋51	0	＋76	＋25
		609.half-dozen（24.0）	914.4（36.0）	＋76	0	＋127	＋51
	Position of outer band is not adjustable (in centric direction).	-	76.2（3.0）	＋25	0	－13	－38	Outer ring is fixed in centric management.
		76.2（3.0）	127.0（5.0）	＋25	0	－25	－51
		127.0（5.0）	304.eight（12.0）	＋25	0	－25	－51
		304.8（12.0）	609.6（24.0）	＋51	0	－25	－76
		609.6（24.0）	914.4（36.0）	＋76	0	－25	－102
Rotating outer band load	Position of outer band is not adjustable (in axial direction).	-	76.2（3.0）	＋25	0	－13	－38	Outer ring is fixed in axial direction.
		76.2（3.0）	127.0（v.0）	＋25	0	－25	－51
		127.0（v.0）	304.eight（12.0）	＋25	0	－25	－51
		304.8（12.0）	609.6（24.0）	＋51	0	－25	－76
		609.6（24.0）	914.4（36.0）	＋76	0	－25	－102

Bearing tolerance : grade three, class 0^i）

Load type		Nominal outside diameter D mm（one/25.iv）		Departure of a single outside diameter Δ Ds , µm		Dimensional tolerance of housing bore diameter µm		Remarks
		over	upward to	upper	lower	upper	lower
Rotating inner ring load	Used for free side.	-	152.4（six.0）	＋13	0	＋38	＋25	Outer ring is hands displaceable in centric direction.
		152.iv（6.0）	304.viii（12.0）	＋thirteen	0	＋38	＋25
		304.8（12.0）	609.vi（24.0）	＋25	0	＋64	＋38
		609.6（24.0）	914.four（36.0）	＋38	0	＋89	＋51
	Used for fixed side.	-	152.4（6.0）	＋13	0	＋25	＋xiii	Outer ring is displaceable in centric direction.
		152.4（half-dozen.0）	304.8（12.0）	＋13	0	＋25	＋xiii
		304.8（12.0）	609.6（24.0）	＋25	0	＋51	＋25
		609.6（24.0）	914.four（36.0）	＋38	0	＋76	＋38
	Position of outer ring is adjustable (in centric direction).	-	152.four（vi.0）	＋13	0	＋13	0	Position of outer ring is not adjustable (in axial direction).
		152.4（6.0）	304.eight（12.0）	＋13	0	＋25	0
		304.viii（12.0）	609.6（24.0）	＋25	0	＋25	0
		609.six（24.0）	914.4（36.0）	＋38	0	＋28	0
	Position of outer ring is not adjustable (in axial direction).	-	152.four（six.0）	＋xiii	0	0	－xiii	Outer ring is fixed in axial direction.
		152.four（6.0）	304.8（12.0）	＋13	0	0	－25
		304.8（12.0）	609.6（24.0）	＋25	0	0	－25
		609.6（24.0）	914.4（36.0）	＋38	0	0	－38
Rotating outer ring load	Position of outer ring is not adaptable (in axial direction).	-	152.4（6.0）	＋thirteen	0	－13	－25	Outer band is fixed in axial direction.
		152.iv（6.0）	304.eight（12.0）	＋13	0	－thirteen	－38
		304.8（12.0）	609.6（24.0）	＋25	0	－13	－38
		609.half dozen（24.0）	914.4（36.0）	＋38	0	－thirteen	－51

[Annotation]i) Class 0 begetting : D≦304.8mm

Table ix-8 (i) Recommended shaft fits for thrust bearings (classes 0, 6)

Load blazon		Shaft bore, mm		Course of shaft tolerance range	Remarks
		over	up to
Central centric load (generally for thrust bearings)		All shaft diameters		js 6	h half dozen may also be used.
Combined load (spherical thrust roller bearing)	Stationary shaft race load	All shaft diameters		js 6	-
	Rotating shaft race load or indeterminate management load	-	200	k 6	js six, k 6 and m six may be used in place of k six, m 6 and n 6, respectively.
		200	400	m 6
		400	-	n half dozen

Table 9-8 (2) Recommended housing fits for thrust bearings (classes 0, 6)

Load type		Class of housing bore diameter tolerance range	Remarks
Primal axial load (generally for thrust bearings)		-	Select such tolerance range form as provides clearance in the radial management for housing race.
		H 8	In case of thrust ball bearings requiring high accuracy.
Combined load (spherical thrust roller bearing)	Stationary housing race load	H vii	-
	Indeterminate management load or rotating housing race load	K vii	In case of application under normal operating conditions.
		Thousand 7	In case of comparably large radial load.

[Remark]This table is applicable to cast iron or steel housings.

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Source: https://koyo.jtekt.co.jp/en/support/bearing-knowledge/9-4000.html

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