440 - Precision - Technical Information - Hobby and Engineering

Precision - 440C Stainless and 52100 Chrome Steel

These tables cover ABEC and ISO tolerances for ball bearings.

Abec 1 or ISO P6 gradings apply to all precision bearings in our catalogue made from SAE52100 or 440C Stainless Steel unless otherwise specified.

The section of our bearing part number that specifies the grade is found near the end, preceded by the country of manufacture code. The following list shows most of our country/precision designations.

• No designation: Abec 1
• grP6: German made ISO P6 precision
• jP6: Japanese made ISO P6 precision
• uP6: US made ISO P6 precision
• gr3: German made Abec 3 precision
• j3: Japanese made Abec 3 precision
• u3: US made ISO Abec 3 precision
• grP5: German made ISO P5 precision
• jP5: Japanese made ISO P5 precision
• s5: Swiss made ISO P5 precision
• uP5: US made ISO P5 precision
• gr5: German made Abec 5 precision
• j5: Japanese made Abec 5 precision
• s5: Swiss made Abec 5 precision
• u5: US made Abec 5 precision
• gr7: German made Abec 7 Precision
• s7: Swiss made Abec 7 Precision
• u7: US made ISO Abec 7 Precision

No country of manufacture is specified in the part number of Abec 1 bearings since they are the most common bearings and supplies may be obtained from a number of different countries as required by demand and/or pricing. The majority of our Abec 1 bearings are Japanese manufactured.

Each table covers either inner or outer ring tolerances for a defined size range as specified in the headers

Tolerances for Inner Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Inner Rings with a Bore >= 0.6 mm and <= 2.5 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	ISO P5A	Abec 5	Abec 5P	ISO P4	ISO P4A	Abec 7	Abec 7P	ISO P2	Abec 9	Abec 9P
Mean bore Deviation dmp	0 to -8	0 to -7.5	0 to -7	0 to -5	0 to -5	0 to -5	0 to -5	0 to -5	0 to -4	0 to -5	0 to -4	0 to -5	0 to -2.5	0 to -2.5	0 to -2.5
Absolute Limit of bore Deviation Vdp	10	10	8	7.5	5	3	5	2.5	4	2.5	4	2.5	2.5	2.5	1.25
Width Deviation Bs	0 to -40	-	0 to -40	0 to -125	0 to -40	0 to -25	0 to -40	0 to -25	0 to -40	0 to -25	0 to -40	0 to -25	0 to -25	0 to -40	0 to -25
Maximum Deviation from Parallel Sides VBs	12	-	12	-	5	5	5	5	2.5	2.5	2.5	2.5	1.5	1.25	1.25
Track Parallelism with Side Sia	-	-	-	-	7.5	7.5	7.5	7.5	3	3	2.5	2.5	1.5	1.25	1.25
Bore Square with Side Sd	-	-	-	-	7.5	7.5	7.5	7.5	3	3	2.5	2.5	1.5	1.25	1.25
Eccentricity of Tracks Kia	10	7.5	5	5	4	3.5	3.5	3.5	2.5	2.5	2.5	2.5	1.5	1.25	1.25

Tolerances for Inner Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Inner Rings with a Bore > 2.5 mm and <= 10 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	ISO P5A	Abec 5	Abec 5P	ISO P4	ISO P4A	Abec 7	Abec 7P	ISO P2	Abec 9	Abec 9P
Mean bore Deviation dmp	0 to -8	0 to -7.5	0 to -7	0 to -5	0 to -5	0 to -5	0 to -5	0 to -5	0 to -4	0 to -5	0 to -4	0 to -5	0 to -2.5	0 to -2.5	0 to -2.5
Absolute Limit of bore Deviation Vdp	10	10	8	7.5	5	3	5	2.5	4	2.5	4	2.5	2.5	2.5	1.25
Width Deviation Bs	0 to -120	0 to -125	0 to -120	0 to -125	0 to -40	0 to -25	0 to -40	0 to -25	0 to -40	0 to -25	0 to -40	0 to -25	0 to -40	0 to -40	0 TO -25
Maximum Deviation from Parallel Sides VBs	15	-	15	-	5	5	5	5	2.5	2.5	2.5	2.5	1.5	1.25	1.25
Track Parallelism with Side Sia	-	-	-	-	7.5	7.5	7.5	7.5	3	3	2.5	2.5	1.5	1.25	1.25
Bore Square with Side Sd	-	-	-	-	7.5	7.5	7.5	7.5	3	3	2.5	2.5	1.5	1.25	1.25
Eccentricity of Tracks Kia	10	7.5	6	5	4	3.5	3.5	3.5	2.5	2.5	2.5	2.5	1.5	1.25	1.25

Tolerances for Inner Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Inner Rings with a Bore > 10 mm and <= 18 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	ISO P5A	Abec 5	Abec 5P	ISO P4	ISO P4A	Abec 7	Abec 7P	ISO P2	Abec 9	Abec 9P
Mean bore Deviation dmp	0 to -8	0 to -7.5	0 to -7	0 to -5	0 to -5	0 to -5	0 to -5	0 to -5	0 to -4	0 to -5	0 to -4	0 to -5	0 to -2.5	0 to -2.5	0 to -2.5
Absolute Limit of bore Deviation Vdp	10	10	8	7.5	5	3	5	2.5	4	2.5	4	2.5	2.5	2.5	1.25
Width Deviation Bs	0 to -120	0 TO -125	0 to -120	0 to -125	0 to -80	0 to -25	0 to -80	0 to -25	0 to -80	0 to -25	0 to -80	0 to -25	0 to -80	0 to -80	0 to -25
Maximum Deviation from Parallel Sides VBs	20	-	20	-	5	5	5	5	2.5	2.5	2.5	2.5	1.5	1.25	1.25
Track Parallelism with Side Sia	-	-	-	-	7.5	7.5	7.5	7.5	3	3	2.5	2.5	1.5	1.25	1.25
Bore Square with Side Sd	-	-	-	-	7.5	7.5	7.5	7.5	3	3	2.5	2.5	1.5	1.25	1.25
Eccentricity of Tracks Kia	10	11	7	5	4	3.5	3.5	3.5	2.5	2.5	2.5	2.5	1.5	1.25	1.25

Tolerances for Inner Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Inner Rings with a Bore > 18 mm and <= 30 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	Abec 5	Abec 5P	ISO P4	Abec 7	Abec 7P	ISO P2	Abec 9	Abec 9P
Mean bore Deviation dmp	0 to -10	0 to -11	0 to -8	0 to -8	0 to -6	0 to -6	0 to -5	0 to -5	0 to -5	0 to -5	0 to -2.5	0 to -2.5	0 to -2.5
Absolute Limit of bore Deviation Vdp	13	13	10	10	6	6	2.5	5	5	5	2.5	2.5	1.25
Width Deviation Bs	0 to -120	0 to -120	0 to -120	0 to -120	0 to -120	0 to -120	0 to -25	0 to -120	0 to -120	0 to -25	0 to -120	0 to -120	0 to -25
Maximum Deviation from Parallel Sides VBs	20	20	20	20	5	5	5	2.5	2.5	2.5	1.5	1.25	1.25
Track Parallelism with Side Sia	-	-	-	-	8	8	8	4	4	4	2.5	2.5	1.25
Bore Square with Side Sd	-	-	-	-	8	8	8	4	4	4	1.5	1.25	1.25
Eccentricity of Tracks Kia	13	13	8	8	4	4	4	2.5	2.5	2.5	2.5	2.5	2.5

Tolerances for Inner Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Inner Rings with a Bore > 30 mm and <= 50 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	Abec 5	ISO P4	Abec 7	ISO P2	Abec 9
Mean bore Deviation dmp	0 to -12	0 to -12	0 to -10	0 to -10	0 to -8	0 to -8	0 to -6	0 to -6	0 to -2.5	0 to -2.5
Absolute Limit of bore Deviation Vdp	15	15	13	13	8	8	6	6	2.5	2.5
Width Deviation Bs	0 to -120	0 to -120	0 to -120	0 to -120	0 to -120	0 to -120	0 to -120	0 to -120	0 to -120	0 to -120
Maximum Deviation from Parallel Sides VBs	20	20	20	20	8	8	6	6	1.5	1.5
Track Parallelism with Side Sia	-	-	-	-	8	8	4	4	2.5	2.5
Bore Square with Side Sd	-	-	-	-	8	8	4	4	1.5	1.5
Eccentricity of Tracks Kia	15	15	10	10	5	5	4	4	2.5	2.5

Tolerances for Inner Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Inner Rings with a Bore > 50 mm and <= 80 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	Abec 5	ISO P4	Abec 7	ISO P2	Abec 9
Mean bore Deviation dmp	0 to -12	0 to -12	0 to -12	0 to -12	0 to -9	0 to -9	0 to -7.5	0 to -7.5	0 to -4	0 to -4
Absolute Limit of bore Deviation Vdp	19	19	15	15	9	9	7.5	7.5	4	4
Width Deviation Bs	0 to -150	0 to -150	0 to -150	0 to -150	0 to -150	0 to -150	0 to -150	0 to -150	0 to -150	0 to -150
Maximum Deviation from Parallel Sides VBs	25	25	25	25	6	6	4	4	1.5	1.5
Track Parallelism with Side Sia	-	-	-	-	8	8	5	5	2.5	2.5
Bore Square with Side Sd	-	-	-	-	8	8	5	5	1.5	1.5
Eccentricity of Tracks Kia	20	20	10	10	5	5	4	4	2.5	2.5

Tolerances for Outer Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Outer Rings with an OD > 2.5 mm and <= 18 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	ISO P5A	Abec 5	Abec 5P	ISO P4	ISO P4A	Abec 7	Abec 7P	ISO P2	Abec 9	Abec 9P
Mean Outer Dia Deviation dmp	0 to -8	0 to -7.5	0 to -7	0 to -7.5	0 to -5	0 to -5	0 to -5	0 to -5	0 to -4	0 to -4	0 to -5	0 to -5	0 to -2.5	0 to -2.5	0 to -2.5
Absolute Limit of Outside Diameter Deviation Vdp	10	10	9	9	5	3	5	5	4	2.5	4	5	2.5	2.5	0.5
Width Deviation Cs	Based on bore size
Maximum Deviation from Parallel Sides VCs	Based on bore size
Track Parallelism with Side Sea	-	-	-	-	8	8	7.5	7.5	5	5	5	4	1.5	1.25	1.25
OD Square with Side Sd	-	-	-	-	8	8	7.5	7.5	4	4	4	4	1.5	1.25	1.25
Eccentricity of Tracks Kea	15	15	8	7.5	5	5	5	5	3	3.5	4	4	1.5	1.25	1.25

Tolerances for Outer Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Outer Rings with an OD > 18 mm and <= 30 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	ISO P5A	Abec 5	Abec 5P	ISO P4	ISO P4A	Abec 7	Abec 7P	ISO P2	Abec 9	Abec 9P
Mean Outer Dia Deviation dmp	0 to -9	0 to -10	0 to -8	0 to -7.5	0 to -6	0 to -6	0 to -5	0 to -5	0 to -5	0 to -5	0 to -5	0 to -5	0 to -4	0 to -4	0 to -4
Absolute Limit of Outside Diameter Deviation Vdp	12	11	10	10	6	3	6	5	5	2.5	5	5	4	4	0.8
Width Deviation Cs	Based on bore size
Maximum Deviation from Parallel Sides VCs	Based on bore size
Track Parallelism with Side Sea	-	-	-	-	8	8	7.5	7.5	5	5	5	5	2.5	2.5	2.5
OD Square with Side Sd	-	-	-	-	8	8	7.5	7.5	4	4	4	4	1.5	1.25	1.25
Eccentricity of Tracks Kea	15	15	9	9	6	6	5	5	4	4	4	4	2.5	2.5	2.5

Tolerances for Outer Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Outer Rings with an OD > 30 mm and <= 50 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	Abec 5	Abec 5P	ISO P4	Abec 7	Abec 7P	ISO P2	Abec 9	Abec 9P
Mean Outer Dia Deviation dmp	0 to -11	0 to -11	0 to -9	0 to -9	0 to -7	0 to -7.5	0 to -5	0 to -6	0 to -6	0 to -5	0 to -4	0 to -4	0 to -4
Absolute Limit of Outside Diameter Deviation Vdp	14	14	14	14	7	7.5	5	6	6	5	4	4	-
Width Deviation Cs	Based on bore size
Maximum Deviation from Parallel Sides VCs	Based on bore size
Track Parallelism with Side Sea	-	-	-	-	8	7.5	7.5	5	5	5	2.5	2.5	2.5
OD Square with Side Sd	-	-	-	-	8	7.5	7.5	4	4	4	1.5	1.25	1.25
Eccentricity of Tracks Kea	20	20	10	10	7	7.5	5	5	5	4	2.5	2.5	2.5

Tolerances for Outer Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Outer Rings with an OD > 50 mm and <= 80 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	Abec 5	ISO P4	Abec 7	ISO P2	Abec 9
Mean Outer Dia Deviation dmp	0 to -13	0 to -13	0 to -11	0 to -11	0 to -9	0 to -9	0 to -7	0 to -7.5	0 to -4	0 to -4
Absolute Limit of Outside Diameter Deviation Vdp	16	17	16	16	9	9	7	7.5	4	4
Width Deviation Cs	Based on bore size
Maximum Deviation from Parallel Sides VCs	Based on bore size
Track Parallelism with Side Sea	-	-	-	-	10	10	5	5	4	4
OD Square with Side Sd	-	-	-	-	8	7.5	4	4	1.5	1.25
Eccentricity of Tracks Kea	25	25	13	13	8	7.5	5	5	4	4

Tolerances for Outer Rings
Dimensions are in 0.001 mm (thousandths of a mm)

Outer Rings with an OD > 80 mm and <= 120 mm

Precision Grade	ISO P0	Abec 1	ISO P6	Abec 3	ISO P5	Abec 5	ISO P4	Abec 7	ISO P2	Abec 9
Mean Outer Dia Deviation dmp	0 to -15	0 to -16	0 to -13	0 to -13	0 to -10	0 to -10	0 to -8	0 to -7.5	0 to -5	0 to -5
Absolute Limit of Outside Diameter Deviation Vdp	19	19	17	17	10	10	8	7.5	5	5
Width Deviation Cs	Based on bore size
Maximum Deviation from Parallel Sides VCs	Based on bore size
Track Parallelism with Side Sea	-	-	-	-	11	11	6	6	5	5
OD Square with Side Sd	-	-	-	-	9	9	5	5	2.5	2.5
Eccentricity of Tracks Kea	35	35	18	18	10	10	6	6	5	5

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