• NTN Miniature Bearings, Inch R/RA Series (Open, Shielded, Flanged)
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NTN Miniature Bearings, Inch R/RA Series (Open, Shielded, Flanged)

NTN Miniature Bearings, Inch R/RA Series (Open, Shielded, Flanged)

NTN inch-dimension miniature ball bearings of the R and RA series, bore 1.984-9.525 mm, open, shielded and flanged.

Key features

  • Inch boundary dimensions (R series)
  • RA wide types with shield designations (Z, ZA)
  • Flanged versions with FL prefix
  • Basic load ratings shown in kN

Specifications

Bearing type Miniature deep groove ball bearing
Bore range 1.984-9.525 mm
Dimension system Inch
Load rating unit kN
Brand NTN
Source NTN NTN Ball and Roller Bearings catalogue, p. 20
R1-4 d: 1.984 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.279 kN | C0r: 0.089 kN
RA1-4ZA d: 1.984 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.279 kN | C0r: 0.089 kN
FLR1-4 d: 1.984 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.279 kN | C0r: 0.089 kN
FLRA1-4ZA d: 1.984 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.279 kN | C0r: 0.089 kN
R133 d: 2.38 mm | D: 4.762 mm | B: 1.588 mm | Cr: 0.124 kN | C0r: 0.042 kN
RA133ZA d: 2.38 mm | D: 4.762 mm | B: 1.588 mm | Cr: 0.124 kN | C0r: 0.042 kN
FLR133 d: 2.38 mm | D: 4.762 mm | B: 1.588 mm | Cr: 0.124 kN | C0r: 0.042 kN
FLRA133ZA d: 2.38 mm | D: 4.762 mm | B: 1.588 mm | Cr: 0.124 kN | C0r: 0.042 kN
R1-5 d: 2.38 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.43 kN | C0r: 0.152 kN
RA1-5ZA d: 2.38 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.43 kN | C0r: 0.152 kN
FLR1-8 d: 2.38 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.43 kN | C0r: 0.152 kN
FLRA1-5ZA d: 2.38 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.43 kN | C0r: 0.152 kN
R144 d: 3.175 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.284 kN | C0r: 0.096 kN
RA144ZA d: 3.175 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.284 kN | C0r: 0.096 kN
FLR144 d: 3.175 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.284 kN | C0r: 0.096 kN
FLRA144ZA d: 3.175 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.284 kN | C0r: 0.096 kN
R2-5 d: 3.175 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.56 kN | C0r: 0.18 kN
RA2-5Z d: 3.175 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.56 kN | C0r: 0.18 kN
FLR2-5 d: 3.175 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.56 kN | C0r: 0.18 kN
FLRA2-5Z d: 3.175 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.56 kN | C0r: 0.18 kN
R2-6 d: 3.175 mm | D: 9.525 mm | B: 2.779 mm | Cr: 0.64 kN | C0r: 0.224 kN
RA2-6ZA d: 3.175 mm | D: 9.525 mm | B: 2.779 mm | Cr: 0.64 kN | C0r: 0.224 kN
FLR2-6 d: 3.175 mm | D: 9.525 mm | B: 2.779 mm | Cr: 0.64 kN | C0r: 0.224 kN
FLRA2-6ZA d: 3.175 mm | D: 9.525 mm | B: 2.779 mm | Cr: 0.64 kN | C0r: 0.224 kN
R2 d: 3.175 mm | D: 9.525 mm | B: 3.967 mm | Cr: 0.64 kN | C0r: 0.224 kN
RA2ZA d: 3.175 mm | D: 9.525 mm | B: 3.967 mm | Cr: 0.64 kN | C0r: 0.224 kN
FLR2 d: 3.175 mm | D: 9.525 mm | B: 3.967 mm | Cr: 0.64 kN | C0r: 0.224 kN
FLRA2ZA d: 3.175 mm | D: 9.525 mm | B: 3.967 mm | Cr: 0.64 kN | C0r: 0.224 kN
RA2 d: 3.175 mm | D: 12.7 mm | B: 4.366 mm | Cr: 1.15 kN | C0r: 0.395 kN
R155 d: 3.967 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.335 kN | C0r: 0.133 kN
RA155ZA d: 3.967 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.335 kN | C0r: 0.133 kN
FLR155 d: 3.967 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.335 kN | C0r: 0.133 kN
FLRA155ZA d: 3.967 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.335 kN | C0r: 0.133 kN
R156 d: 4.762 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.395 kN | C0r: 0.143 kN
RA156Z d: 4.762 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.395 kN | C0r: 0.143 kN
FLR156 d: 4.762 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.395 kN | C0r: 0.143 kN
FLRA156Z d: 4.762 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.395 kN | C0r: 0.143 kN
R166 d: 4.762 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.71 kN | C0r: 0.268 kN
R166Z d: 4.762 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.71 kN | C0r: 0.268 kN
FLR166 d: 4.762 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.71 kN | C0r: 0.268 kN
FLRA166Z d: 4.762 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.71 kN | C0r: 0.268 kN
R3 d: 4.762 mm | D: 12.7 mm | B: 3.967 mm | Cr: 1.31 kN | C0r: 0.49 kN
RA3 d: 4.762 mm | D: 12.7 mm | B: 4.978 mm | Cr: 1.31 kN | C0r: 0.49 kN
RA3Z d: 4.762 mm | D: 12.7 mm | B: 4.978 mm | Cr: 1.31 kN | C0r: 0.49 kN
FLRA3 d: 4.762 mm | D: 12.7 mm | B: 4.978 mm | Cr: 1.31 kN | C0r: 0.49 kN
FLRA3Z d: 4.762 mm | D: 12.7 mm | B: 4.978 mm | Cr: 1.31 kN | C0r: 0.49 kN
R168A d: 6.35 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.21 kN | C0r: 0.094 kN
R168AZ d: 6.35 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.21 kN | C0r: 0.094 kN
FLRA168AZ d: 6.35 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.21 kN | C0r: 0.094 kN
R188 d: 6.35 mm | D: 12.7 mm | B: 3.175 mm | Cr: 0.83 kN | C0r: 0.37 kN
RA188ZA d: 6.35 mm | D: 12.7 mm | B: 3.175 mm | Cr: 0.83 kN | C0r: 0.37 kN
FLR188 d: 6.35 mm | D: 12.7 mm | B: 3.175 mm | Cr: 0.83 kN | C0r: 0.37 kN
FLRA188ZA d: 6.35 mm | D: 12.7 mm | B: 3.175 mm | Cr: 0.83 kN | C0r: 0.37 kN
R4 d: 6.35 mm | D: 15.875 mm | B: 4.978 mm | Cr: 1.48 kN | C0r: 0.615 kN
R4Z d: 6.35 mm | D: 15.875 mm | B: 4.978 mm | Cr: 1.48 kN | C0r: 0.615 kN
FLR4 d: 6.35 mm | D: 15.875 mm | B: 4.978 mm | Cr: 1.48 kN | C0r: 0.615 kN
FLR4Z d: 6.35 mm | D: 15.875 mm | B: 4.978 mm | Cr: 1.48 kN | C0r: 0.615 kN
RA4Z d: 6.35 mm | D: 19.05 mm | B: - | Cr: 2.34 kN | C0r: 0.885 kN
R6Z d: 9.525 mm | D: 22.225 mm | B: - | Cr: 3.3 kN | C0r: 1.4 kN
FLR6Z d: 9.525 mm | D: 22.225 mm | B: - | Cr: 3.3 kN | C0r: 1.4 kN
Miniature BearingsNTN
60 product codes available in this family
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NTN Miniature Bearings, Inch R/RA Series (Open, Shielded, Flanged)

Brand NTN·Miniature Bearings

Available part numbers (60)

R1-4, RA1-4ZA, FLR1-4, FLRA1-4ZA, R133, RA133ZA, FLR133, FLRA133ZA, R1-5, RA1-5ZA + 50 more — see full table ↓

How to order

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Product codes & specifications
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Product codeSpec
R1-4d: 1.984 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.279 kN | C0r: 0.089 kN
RA1-4ZAd: 1.984 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.279 kN | C0r: 0.089 kN
FLR1-4d: 1.984 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.279 kN | C0r: 0.089 kN
FLRA1-4ZAd: 1.984 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.279 kN | C0r: 0.089 kN
R133d: 2.38 mm | D: 4.762 mm | B: 1.588 mm | Cr: 0.124 kN | C0r: 0.042 kN
RA133ZAd: 2.38 mm | D: 4.762 mm | B: 1.588 mm | Cr: 0.124 kN | C0r: 0.042 kN
FLR133d: 2.38 mm | D: 4.762 mm | B: 1.588 mm | Cr: 0.124 kN | C0r: 0.042 kN
FLRA133ZAd: 2.38 mm | D: 4.762 mm | B: 1.588 mm | Cr: 0.124 kN | C0r: 0.042 kN
R1-5d: 2.38 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.43 kN | C0r: 0.152 kN
RA1-5ZAd: 2.38 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.43 kN | C0r: 0.152 kN
FLR1-8d: 2.38 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.43 kN | C0r: 0.152 kN
FLRA1-5ZAd: 2.38 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.43 kN | C0r: 0.152 kN
R144d: 3.175 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.284 kN | C0r: 0.096 kN
RA144ZAd: 3.175 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.284 kN | C0r: 0.096 kN
FLR144d: 3.175 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.284 kN | C0r: 0.096 kN
FLRA144ZAd: 3.175 mm | D: 6.35 mm | B: 2.38 mm | Cr: 0.284 kN | C0r: 0.096 kN
R2-5d: 3.175 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.56 kN | C0r: 0.18 kN
RA2-5Zd: 3.175 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.56 kN | C0r: 0.18 kN
FLR2-5d: 3.175 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.56 kN | C0r: 0.18 kN
FLRA2-5Zd: 3.175 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.56 kN | C0r: 0.18 kN
R2-6d: 3.175 mm | D: 9.525 mm | B: 2.779 mm | Cr: 0.64 kN | C0r: 0.224 kN
RA2-6ZAd: 3.175 mm | D: 9.525 mm | B: 2.779 mm | Cr: 0.64 kN | C0r: 0.224 kN
FLR2-6d: 3.175 mm | D: 9.525 mm | B: 2.779 mm | Cr: 0.64 kN | C0r: 0.224 kN
FLRA2-6ZAd: 3.175 mm | D: 9.525 mm | B: 2.779 mm | Cr: 0.64 kN | C0r: 0.224 kN
R2d: 3.175 mm | D: 9.525 mm | B: 3.967 mm | Cr: 0.64 kN | C0r: 0.224 kN
RA2ZAd: 3.175 mm | D: 9.525 mm | B: 3.967 mm | Cr: 0.64 kN | C0r: 0.224 kN
FLR2d: 3.175 mm | D: 9.525 mm | B: 3.967 mm | Cr: 0.64 kN | C0r: 0.224 kN
FLRA2ZAd: 3.175 mm | D: 9.525 mm | B: 3.967 mm | Cr: 0.64 kN | C0r: 0.224 kN
RA2d: 3.175 mm | D: 12.7 mm | B: 4.366 mm | Cr: 1.15 kN | C0r: 0.395 kN
R155d: 3.967 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.335 kN | C0r: 0.133 kN
RA155ZAd: 3.967 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.335 kN | C0r: 0.133 kN
FLR155d: 3.967 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.335 kN | C0r: 0.133 kN
FLRA155ZAd: 3.967 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.335 kN | C0r: 0.133 kN
R156d: 4.762 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.395 kN | C0r: 0.143 kN
RA156Zd: 4.762 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.395 kN | C0r: 0.143 kN
FLR156d: 4.762 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.395 kN | C0r: 0.143 kN
FLRA156Zd: 4.762 mm | D: 7.938 mm | B: 2.779 mm | Cr: 0.395 kN | C0r: 0.143 kN
R166d: 4.762 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.71 kN | C0r: 0.268 kN
R166Zd: 4.762 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.71 kN | C0r: 0.268 kN
FLR166d: 4.762 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.71 kN | C0r: 0.268 kN
FLRA166Zd: 4.762 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.71 kN | C0r: 0.268 kN
R3d: 4.762 mm | D: 12.7 mm | B: 3.967 mm | Cr: 1.31 kN | C0r: 0.49 kN
RA3d: 4.762 mm | D: 12.7 mm | B: 4.978 mm | Cr: 1.31 kN | C0r: 0.49 kN
RA3Zd: 4.762 mm | D: 12.7 mm | B: 4.978 mm | Cr: 1.31 kN | C0r: 0.49 kN
FLRA3d: 4.762 mm | D: 12.7 mm | B: 4.978 mm | Cr: 1.31 kN | C0r: 0.49 kN
FLRA3Zd: 4.762 mm | D: 12.7 mm | B: 4.978 mm | Cr: 1.31 kN | C0r: 0.49 kN
R168Ad: 6.35 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.21 kN | C0r: 0.094 kN
R168AZd: 6.35 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.21 kN | C0r: 0.094 kN
FLRA168AZd: 6.35 mm | D: 9.525 mm | B: 3.175 mm | Cr: 0.21 kN | C0r: 0.094 kN
R188d: 6.35 mm | D: 12.7 mm | B: 3.175 mm | Cr: 0.83 kN | C0r: 0.37 kN
RA188ZAd: 6.35 mm | D: 12.7 mm | B: 3.175 mm | Cr: 0.83 kN | C0r: 0.37 kN
FLR188d: 6.35 mm | D: 12.7 mm | B: 3.175 mm | Cr: 0.83 kN | C0r: 0.37 kN
FLRA188ZAd: 6.35 mm | D: 12.7 mm | B: 3.175 mm | Cr: 0.83 kN | C0r: 0.37 kN
R4d: 6.35 mm | D: 15.875 mm | B: 4.978 mm | Cr: 1.48 kN | C0r: 0.615 kN
R4Zd: 6.35 mm | D: 15.875 mm | B: 4.978 mm | Cr: 1.48 kN | C0r: 0.615 kN
FLR4d: 6.35 mm | D: 15.875 mm | B: 4.978 mm | Cr: 1.48 kN | C0r: 0.615 kN
FLR4Zd: 6.35 mm | D: 15.875 mm | B: 4.978 mm | Cr: 1.48 kN | C0r: 0.615 kN
RA4Zd: 6.35 mm | D: 19.05 mm | B: - | Cr: 2.34 kN | C0r: 0.885 kN
R6Zd: 9.525 mm | D: 22.225 mm | B: - | Cr: 3.3 kN | C0r: 1.4 kN
FLR6Zd: 9.525 mm | D: 22.225 mm | B: - | Cr: 3.3 kN | C0r: 1.4 kN

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