NMB Miniature and Instrument Bearings From NPB
Unflanged
Interchange Table Flanged
Interchange Table

National Precision Bearing is Your Source for NMB Miniature Bearings

For product inquiries call (855) 853-2230 to speak with a dedicated NMB sales representative or email sales@nationalprecision.com.

National Precision Bearing is the largest stocking distributor of NMB brand miniature and instrument bearings. NMB bearings are known world-wide for providing the highest quality, consistency, and value. National Precision Bearing stocks the widest range of NMB standards and custom configurations for medical, automotive, printer, motor, packaging, automation, and other precision industrial applications.

About NMB

Headquartered in Detroit, Michigan, NMB Technologies Corporation was founded in September 1968 as the sales and marketing arm for its parent company, Minebea Co., Ltd.

From the beginning, NMB has believed in creating strong partnerships with our customers. This commitment to our customers is demonstrated by making available local application engineers, knowledgeable direct sales, and partnering with world class distributors and local representatives who know our products and its quality inside out.

As part of the Minebea Group of Companies, NMB Technologies Corporation places a global manufacturing powerhouse in the hands of our customers. With 25 manufacturing facilities located in Thailand, China, Singapore, Japan, Europe and North America, and over 50,000 people employed world wide, the NMB/Minebea Group of Companies remains a world leader in the design and manufacturing of electro-mechanical components.

At NMB, our commitment to our customers compels us to protect the supply chain, drive cost efficiency, and hold quality to the highest standard. Quality in our people, quality in our services, and quality in our products continues to be our primary component.

National Precision Bearing stocks NMB miniature and instrument bearings ranging from 1mm bore to 26mm outside diameter. Other NMB Bearing Options and Configuration Include:

  • Chrome and Stainless Steel
  • Crown, Ribbon, and Plastic Cages
  • Flanged and Unflanged Bearings
  • Shielded, Sealed, Non-Contact Seal, and Open Bearings
  • Extended Inner Race
  • Premium Race and Low Noise Options
  • External Snap ring
  • Custom greases, oils, and re-lubrication on request

In addition to the standard inch and metric series we offer a full range of specialty bearings from a modified dimension to bearings that reach speeds up to 500,000 RPM.

If this is not the product you are looking for, check our bearing product selector to the left.

National Precision offers an extensive selection of ball, needle, spherical, and plain bearings.

Unflanged Bearings Interchange

Unflanged Bearings Interchange
Bore Diameter Outside Diameter Unflanged
NMB Bearing
Part Number		 Standard Bearing
Cross Reference
Part Number		 Unflanged Width
Open 1 Shield (Z) 2 Shields (ZZ)
Inch Metric Inch Metric Inch Metric Inch Metric Inch Metric
0.0394 1 0.1181 3 DDL310 S681 0.0394 1 — — — —
0.04 1.02 0.125 3.18 DDRI2 SR09 0.0469 1.19 — — — —
0.0469 1.19 0.1562 3.97 DDRI21/2 SR0 0.0625 1.59 0.0937 2.38 0.0937 2.38
0.055 1.4 0.1875 4.76 DDRI3 SR1 0.0781 1.98 0.0937 2.38 0.1094 2.78
0.0591 1.5 0.1575 4 DDL415 S681X 0.0472 1.2 — — — —
0.0591 1.5 0.1969 5 DDR515 S691X 0.0787 2 0.1024 2.6 0.1024 2.6
0.0591 1.5 0.2362 6 DDR615 S601X 0.0984 2.5 0.1181 3 0.1181 3
0.0781 1.98 0.25 6.35 DDRI4 SR14 0.0937 2.38 0.1094 2.78 0.1406 3.57
0.0787 2 0.1969 5 DDL520 S682 0.0591 1.5 — — 0.0906 2.3
0.0787 2 0.2362 6 DDR620 S692 0.0906 2.3 0.1181 3 0.1181 3
0.0787 2 0.2756 7 DDR720 S602 0.1102 2.8 0.1378 3.5 0.1378 3.5
0.0937 2.38 0.1875 4.76 DDRI3332 SR133 0.0625 1.59 0.0937 2.38 0.0937 2.38
0.0937 2.38 0.3125 7.94 DDRI5 SR15 0.1094 2.78 0.1094 2.78 0.1406 3.57
0.0984 2.5 0.2362 6 DDL625 S682X 0.0709 1.8   0 0.1024 2.6
0.0984 2.5 0.2756 7 DDR725 S692X 0.0984 2.5 0.1378 3.5 0.1378 3.5
0.0984 2.5 0.315 8 DDR825 S602X 0.1102 2.8 0.1575 4 0.1575 4
0.1181 3 0.2362 6 DDL630 SMR63 0.0787 2 — — 0.0984 2.5
0.1181 3 0.2756 7 DDL730 S683 0.0787 2 — — 0.1181 3
0.1181 3 0.315 8 DDR830 S693 0.1181 3 0.1575 4 0.1575 4
0.1181 3 0.3543 9 DDR930 S603 0.1181 3 0.1969 5 0.1969 5
0.1181 3 0.3937 10 DDR1030 S623 0.1575 4 0.1575 4 0.1575 4
0.125 3.18 0.25 6.35 DDRI418 SR144 0.0937 2.38 0.0937 2.38 0.1094 2.78
0.125 3.18 0.3125 7.94 DDRI518 SR25 0.1094 2.78 0.1094 2.78 0.1406 3.57
0.125 3.18 0.375 9.53 DDRI618 SR26 0.1094 2.78 0.1094 2.78 0.1406 3.57
0.125 3.18 0.375 9.53 DDR2 SR2 0.1562 3.97 0.1562 3.97 0.1562 3.97
0.125 3.18 0.5 12.7 DDR2A SR2A 0.1719 4.37 0.1719 4.37 0.1719 4.37
0.1562 3.97 0.3125 7.94 DDRI5532 SR155 0.1094 2.78 0.1094 2.78 0.125 3.18
0.1575 4 0.2756 7 DDL740 SMR74 0.0787 2 — — 0.0984 2.5
0.1575 4 0.315 8 DDL840 SMR84 0.0787 2 — — 0.1181 3
0.1575 4 0.3543 9 DDL940 S684 0.0984 2.5 — — 0.1575 4
0.1575 4 0.3937 10 DDL1040 SR104 0.1181 3 — — 0.1575 4
0.1575 4 0.4331 11 DDR1140 S694 0.1575 4 0.1575 4 0.1575 4
0.1575 4 0.4724 12 DDR1240 S604 0.1575 4 0.1575 4 0.1575 4
0.1575 4 0.5118 13 DDR1340 S624 0.1969 5 0.1969 5 0.1969 5
0.1575 4 0.6299 16 DDR1640 S634 0.1969 5 — — 0.1969 5
0.1875 4.76 0.3125 7.94 DDRI5632 SR156 0.1094 2.78 0.1094 2.78 0.125 3.18
0.1875 4.76 0.375 9.53 DDRI6632 SR166 0.125 3.18 0.125 3.18 0.125 3.18
0.1875 4.76 0.5 12.7 DDR3 SR3 0.1562 3.97 0.196 4.98 0.196 4.98
0.1969 5 0.315 8 DDL850 SMR85 0.0787 2 — — 0.0984 2.5
0.1969 5 0.3543 9 DDL950 SMR95 0.0984 2.5 — — 0.1181 3
0.1969 5 0.3937 10 DDL1050 SMR105 0.1181 3 — — 0.1575 4
0.1969 5 0.4331 11 DDL1150 S685 0.1181 3 — — 0.1969 5
0.1969 5 0.5118 13 DDR1350 S695 0.1575 4 0.1575 4 0.1575 4
0.1969 5 0.5512 14 DDR1450 S605 0.1969 5 0.1969 5 0.1969 5
0.1969 5 0.6299 16 DDR1650 S625 0.1969 5 0.1969 5 0.1969 5
0.1969 5 0.748 19 DDR1950 S635 0.2362 6 0.2362 6 0.2362 6
0.2362 6 0.3937 10 DDL1060 SMR106 0.0984 2.5 — — 0.1181 3
0.2362 6 0.4724 12 DDL1260 SMR126 0.1181 3 — — 0.1575 4
0.2362 6 0.5118 13 DDL1360 S686 0.1378 3.5 — — 0.1969 5
0.2362 6 0.5906 15 DDR1560 S696 0.1969 5 0.1969 5 0.1969 5
0.2362 6 0.6693 17 DDR1760 S606 0.2362 6 0.2362 6 0.2362 6
0.2362 6 0.748 19 DDR1960 S626 0.2362 6 0.2362 6 0.2362 6
0.25 6.35 0.375 9.53 DDRI614 SR168 0.125 3.18 0.125 3.18 0.125 3.18
0.25 6.35 0.5 12.7 DDRI814 SR188 0.125 3.18 0.125 3.18 0.1875 4.76
0.25 6.35 0.625 15.88 DDR4 SR4 0.196 4.98 0.196 4.98 0.196 4.98
0.25 6.35 0.75 19.05 DDRI1214 SR4A 0.2188 5.56 0.2812 7.14 0.2812 7.14
0.2756 7 0.4331 11 DDL1170 SMR117 0.0984 2.5 — — 0.1181 3
0.2756 7 0.5118 13 DDL1370 SMR137 0.1181 3 — — 0.1575 4
0.2756 7 0.5512 14 DDL1470 S687 0.1378 3.5 — — 0.1969 5
0.2756 7 0.748 19 DDR1970 S607 0.2362 6 0.2362 6 0.2362 6
0.2756 7 0.8661 22 DDR2270 S627 0.2756 7 0.2756 7 0.2756 7
0.3125 7.94 0.5 12.7 DDRI8516 SR1810 0.1562 3.97 0.1562 3.97 0.1562 3.97
0.315 8 0.4724 12 DDL1280 SMR128 0.0984 2.5 — — 0.1378 3.5
0.315 8 0.5512 14 DDL1480 SMR148 0.1378 3.5 — — 0.1575 4
0.315 8 0.6299 16 DDL1680 S688 0.1575 4 — — 0.1969 5
0.315 8 0.748 19 DDR1980 S698 0.2362 6 0.2362 6 0.2362 6
0.315 8 0.8661 22 DDR2280 S608 0.2756 7 0.2756 7 0.2756 7
0.3543 9 0.6693 17 DDL1790 S689 0.1575 4 — — 0.1969 5
0.3543 9 0.7874 20 DDL2090 S699 0.2362 6 — — 0.2362 6
0.375 9.53 0.625 15.88 DDRI1038 SR620 0.1562 3.97 0.1562 3.97 0.1562 3.97
0.375 9.53 0.875 22.23 DDRI1438 SR6 0.2188 5.56 0.2812 7.14 0.2812 7.14
0.3937 10 0.748 19 DDL1910 S6800 0.1969 5 — — 0.2756 7
0.5 12.7 0.75 19.05 DDRI1212 SR824 0.1562 3.97 0.1562 3.97 0.1562 3.97
0.625 15.88 0.875 22.23 DDRI1458 SR1028 0.1562 3.97 0.1562 3.97 0.1562 3.97
0.75 19.05 1 25.4 DDRI1634 SR1232 0.1562 3.97 0.1562 3.97 0.1562 3.97

Flanged Bearings Interchange

Flanged Bearings Interchange
Bore Diameter Outside Diameter Flanged
NMB Bearing
Part Number		 Standard
Flanged Bearing
Cross Reference
Part Number		 Flanged Width
Open 1 Shield (Z) 2 Shields (ZZ)
Inch Metric Inch Metric Inch Metric Inch Metric Inch Metric
0.0394 1 0.1181 3 DDLF310 SF681 0.0394 1 — — — —
0.04 1.02 0.125 3.18 DDRIF2 SFR09 0.0469 1.19 — — — —
0.0469 1.19 0.1562 3.97 DDRIF21/2 SFR0 0.0625 1.59 0.0937 2.38 0.0937 2.38
0.055 1.4 0.1875 4.76 DDRIF3 SFR1 0.0781 1.98 0.1094 2.78 0.1094 2.78
0.0591 1.5 0.1575 4 DDLF415 SF681X 0.0472 1.2 — — — —
0.0591 1.5 0.1969 5 DDRF515 SF691X 0.0787 2 0.1024 2.6 0.1024 2.6
0.0591 1.5 0.2362 6 DDRF615 SF601X 0.0984 2.5 0.1181 3 0.1181 3
0.0781 1.98 0.25 6.35 DDRIF4 SFR14 0.0937 2.38 0.1406 3.57 0.1406 3.57
0.0787 2 0.1969 5 DDLF520 SF682 0.0591 1.5 — — 0.0906 2.3
0.0787 2 0.2362 6 DDRF620 SF692 0.0906 2.3 0.1181 3 0.1181 3
0.0787 2 0.2756 7 DDRF720 SF602 0.1102 2.8 0.1378 3.5 0.1378 3.5
0.0937 2.38 0.1875 4.76 DDRIF3332 SFR133 0.0625 1.59 0.0937 2.38 0.0937 2.38
0.0937 2.38 0.3125 7.94 DDRIF5 SFR15 0.1094 2.78 0.1406 3.57 0.1406 3.57
0.0984 2.5 0.2362 6 DDLF625 SF682X 0.0709 1.8 — — 0.1024 2.6
0.0984 2.5 0.2756 7 DDRF725 SF692X 0.0984 2.5 0.1378 3.5 0.1378 3.5
0.0984 2.5 0.315 8 DDRF825 SF602X 0.1102 2.8 0.1575 4 0.1575 4
0.1181 3 0.2362 6 DDLF630 SFMR63 0.0787 2 — — 0.0984 2.5
0.1181 3 0.2756 7 DDLF730 SF683 0.0787 2 — — 0.1181 3
0.1181 3 0.315 8 DDRF830 SF693 0.1181 3 0.1575 4 0.1575 4
0.1181 3 0.3543 9 DDRF930 SF603 0.1181 3 0.1969 5 0.1969 5
0.1181 3 0.3937 10 DDRF1030 SF623 0.1575 4 0.1575 4 0.1575 4
0.125 3.18 0.25 6.35 DDRIF418 SFR144 0.0937 2.38 0.1094 2.78 0.1094 2.78
0.125 3.18 0.3125 7.94 DDRIF518 SFR25 0.1094 2.78 0.1406 3.57 0.1406 3.57
0.125 3.18 0.375 9.53 DDRIF618 SFR26 0.1094 2.78 0.1406 3.57 0.1406 3.57
0.125 3.18 0.375 9.53 DDRF2 SFR2 0.1562 3.97 0.1562 3.97 0.1562 3.97
0.1562 3.97 0.3125 7.94 DDRIF5532 SFR155 0.1094 2.78 0.125 3.18 0.125 3.18
0.1575 4 0.2756 7 DDLF740 SFMR74 0.0787 2 — — 0.0984 2.5
0.1575 4 0.315 8 DDLF840 SFMR84 0.0787 2 — — 0.1181 3
0.1575 4 0.3543 9 DDLF940 SF684 0.0984 2.5 — — 0.1575 4
0.1575 4 0.3937 10 DDLF1040 SFR104 0.1181 3 — — 0.1575 4
0.1575 4 0.4331 11 DDRF1140 SF694 0.1575 4 0.1575 4 0.1575 4
0.1575 4 0.4724 12 DDRF1240 SF604 0.1575 4 0.1575 4 0.1575 4
0.1575 4 0.5118 13 DDRF1340 SF624 0.1969 5 0.1969 5 0.1969 5
0.1575 4 0.6299 16 DDRF1640 SF634 0.1969 5 0.1969 5 0.1969 5
0.1875 4.76 0.3125 7.94 DDRIF5632 SFR156 0.1094 2.78 0.125 3.18 0.125 3.18
0.1875 4.76 0.375 9.53 DDRIF6632 SFR166 0.125 3.18 0.125 3.18 0.125 3.18
0.1875 4.76 0.5 12.7 DDRF3 SFR3 0.1562 3.97 0.196 4.98 0.196 4.98
0.1969 5 0.315 8 DDLF850 SFMR85 0.0787 2 — — 0.0984 2.5
0.1969 5 0.3543 9 DDLF950 SFMR95 0.0984 2.5 — — 0.1181 3
0.1969 5 0.3937 10 DDLF1050 SFMR105 0.1181 3 — — 0.1575 4
0.1969 5 0.4331 11 DDLF1150 SF685 0.1181 3 — — 0.1969 5
0.1969 5 0.5118 13 DDRF1350 SF695 0.1575 4 0.1575 4 0.1575 4
0.1969 5 0.5512 14 DDRF1450 SF605 0.1969 5 0.1969 5 0.1969 5
0.1969 5 0.6299 16 DDRF1650 SF625 0.1969 5 0.1969 5 0.1969 5
0.1969 5 0.748 19 DDRF1950 SF635 0.2362 6 0.2362 6 0.2362 6
0.2362 6 0.3937 10 DDLF1060 SFMR106 0.0984 2.5 — — 0.1181 3
0.2362 6 0.4724 12 DDLF1260 SFMR126 0.1181 3 — — 0.1575 4
0.2362 6 0.5118 13 DDLF1360 SF686 0.1378 3.5 — — 0.1969 5
0.2362 6 0.5906 15 DDRF1560 SF696 0.1969 5 0.1969 5 0.1969 5
0.2362 6 0.6693 17 DDRF1760 SF606 0.2362 6 0.2362 6 0.2362 6
0.2362 6 0.748 19 DDRF1960 SF626 0.2362 6 0.2362 6 0.2362 6
0.25 6.35 0.375 9.53 DDRIF614 SFR168 0.125 3.18 0.125 3.18 0.125 3.18
0.25 6.35 0.5 12.7 DDRIF814 SFR188 0.125 3.18 0.1875 4.76 0.1875 4.76
0.25 6.35 0.625 15.88 DDRF4 SFR4 0.196 4.98 0.196 4.98 0.196 4.98
0.2756 7 0.4331 11 DDLF1170 SFMR117 0.0984 2.5 — — 0.1181 3
0.2756 7 0.5118 13 DDLF1370 SFMR137 0.1181 3 — — 0.1575 4
0.2756 7 0.5512 14 DDLF1470 SF687 0.1378 3.5 — — 0.1969 5
0.2756 7 0.748 19 DDRF1970 SF607 — — — — — —
0.2756 7 0.8661 22 DDRF2270 SF627 0.2756 7 0.2756 7 0.2756 7
0.3125 7.94 0.5 12.7 DDRIF8516 SFR1810 0.1562 3.97 0.1562 3.97 0.1562 3.97
0.315 8 0.4724 12 DDLF1280 SFMR128 0.0984 2.5 — — 0.1378 3.5
0.315 8 0.5512 14 DDLF1480 SFMR148 0.1378 3.5 — — 0.1575 4
0.315 8 0.6299 16 DDLF1680 SF688 0.1575 4 — — 0.1969 5
0.315 8 0.748 19 DDRF1980 SF698 — — — — — —
0.315 8 0.8661 22 DDRF2280 SF608 0.2756 7 0.2756 7 0.2756 7
0.3543 9 0.6693 17 DDLF1790 SF689 0.1575 4 — — 0.1969 5
0.375 9.53 0.875 22.23 DDRIF1438 SFR6 0.2812 7.14 0.2812 7.14 0.2812 7.14
0.3937 10 0.748 19 DDLF1790 SF6800 — — — — — —

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