MinebeaMitsumi Product Site

Part Numbering System

The NMB part numbering system is comprised of the base part number and specification.
The NMB part numbering system is unique to MinebeaMitsumi. The JIS part numbering system is based on the identification system specified in JIS B 1513.

NMB Part Numbering

Model Name
Basic Symbols
Material Symbol	Series Symbol	Dimension Symbols
Details 3. Materials	-	-
Display example DD	R-	1560
No display SUJ 2 or equivalent bearing steel DD Martensitic stainless steel CE Outer/Inner ring : SUJ2 or equivalent bearing steel Ball :Ceramic	■Radial ball bearings (metric) R-(RF-) Thick type (with flange) L-(LF-) Thin type (with flange) A- Ultra Thin Type RNR- Thick type with snap ring LNR- Thin Type with snap ring ■Radial ball bearings (inch) RI- All inch types (R-) * Used for some inch types RIF- Flange type ■Thrust ball bearings T- ■Special Type AS- Special shape	Outer diameter - inner diameter dimensions are listed. Ex) Metric size 1560 outer diameter: 15mm inner diameter: 6mm Ex) Inch size 418 outer diameter: 4/16 inch inner diameter: 1/8 inch X Internal design symbol Displayed after the basic symbol when there is a difference in internal design between the basic symbols. Ex) 1560X2 Outer diameter: 15 mm Inner diameter: 6 mm Internal design X2 type

Model Name
Auxiliary Symbol
Shield and Seal Symbols	Noise and Special Symbols	Retainer Symbols
Details4.Shields,Seals	-	Details 5. Retainer
ZZ	MT	R
No display Open type Z Steel plate shield (Fixed with snap ring) H (Pressed) Steel plate shield K (Staked) Steel plate shield S Rubber seal, non-contact type D Rubber seal, contact type When mounting on both sides, they are displayed on top of each other. Ex) ZZ, DD, etc.	MT Low-noise motor specification SD Special design specification W Wider than standard Y Narrower than standard	R Ribbon retainer(steel plate) H Crown retainer(steel plate) MN Resin retainer (Polyamide reinforced) * Resin retainer is also available in other resin materials.

Specification name
Class symbol	Clearance symbol	Lubricant symbol	Grease filling amount symbol
Details 7. Tolerances and Grades	Details 9. Internal Clearance	Details 18. Lubricants	Details 18. Lubricants
P0	P25	LY121	L
Metric dimension series P0 JIS Grade 0 P5 JIS Grade 5 Inch dimension series A1 ABEC 1 A3 ABEC 3P A5 ABEC 5P	Radial Clearance P13 2.5μm ～ 7.5μm P24 5.0μm ～ 10.0μm P25 5.0μm ～ 12.5μm P58 12.5μm ～ 20.0μm * Display method The lower and upper limits in the radial direction are displayed in inches. Ex) Radial clearance For 5.0 μm to 12.5 μm when converted to inches→ 0.0002 in to 0.0005 in Displayed using this number = "P25".	Lubricant type LO Oil LG Grease LY Grease or Oil LD No lubricant	No display Standard filling amount 25% to 35% X 5% ～ 10% L 10% ～ 15% T 15% ～ 20% H 40% ～ 50% J 50% ～ 60% Note 1 The filling amount is expressed as a percentage of the internal space volume. Note 2 For some miniature bearings, the filling amount may be adjusted.

NMB type display example 1

NMB type display example 2

JIS Part Numbering

Model Name
Basic Symbols
Material Symbol	Series Symbol	Inner Diameter Symbol
Details 3. Materials	-	-
Display example No display	60	8
No display SUJ 2 or equivalent bearing steel CE Outer/Inner ring: SUJ 2 or equivalent bearing steel Ball : Ceramicx	60 62 63 Single-row deep groove ball bearings	5 Inner diameter:5mm 6 Inner diameter:6mm ： 00 Inner diameter:10mm 01 Inner diameter:12mm X Internal design symbol Displayed after the basic symbol when there is a difference in internal design between the basic symbols.

Model Name
Auxiliary Symbol
Retainer Symbol	Shield and Seal Symbol	Special Symbol
Details 5. Retainer	Details 4. Shields, Seals	-
No display Ribbon retainer MN Resin retainer (Polyamide reinforced) * Resin retainer is also available in other resin materials.	No display Open type Z Steel plate shield S Rubber seal, non-contact type D Rubber seal, contact type When mounting on both sides, they are displayed on top of each other. Ex) ZZ, DD, etc.	SD Special design specification NR Type with snap ring

Specification name
>Clearance symbol	Sound symbol	Class symbol	Lubricant symbol	Grease filling amount symbol
Details 9. Internal Clearance	-	Details 7. Tolerances and Grades	Details 18. Lubricants	Details 18. Lubricants
M3	MT	P5	LY121	L
Radial Clearance M2 3μm～8μm M3 5μm～10μm M4 8μm～13μm M5 13μm～20μm	MT Low-noise motor specification SM General specification	Lubricant type No display JIS Class 0 P5 JIS Class 5	Lubricant type LO Oil LG Grease LY Grease or oil LD No lubricant	No display Standard filling amount 25%~35% X 5% ～ 10% L 10% ～ 15% T 15% ～ 20% H 40% ～ 50% J 50% ～ 60% Note 1 The filling amount is expressed as a percentage of the internal space volume.

JIS Part Number

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