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Lock Nuts

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Results per page:  16 | 32 | 48
18-8 Stainless Steel Lock Nut with 1/4"-20 Dia./T
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK50

    18-8 Stainless Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK50
  • Item # 22RV96
  • Mfr. Model # U51738.025.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

18-8 Stainless Steel Lock Nut with 3/8"-16 Dia./T
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50

    18-8 Stainless Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50
  • Item # 3PDG9
  • Mfr. Model # U51738.037.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

Grade 2 Steel Lock Nut with 1/2"-13 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK25

    Grade 2 Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK25
  • Item # 22RV62
  • Mfr. Model # U12300.050.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

Grade 2 Steel Lock Nut with #8-32 Dia./Thread Siz
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with #8-32 Dia./Thread Size; PK100

    Grade 2 Steel Lock Nut with #8-32 Dia./Thread Size; PK100
  • Item # 4EFZ5
  • Mfr. Model # KEPI0-80-100P
  • Lock Nut, Nut Style Tooth Washer Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

18-8 Stainless Steel Lock Nut with 1/2"-13 Dia./T
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK10

    18-8 Stainless Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK10
  • Item # 22RV98
  • Mfr. Model # U51738.050.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

Grade 2 Steel Lock Nut with 1/4"-20 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100

    Grade 2 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100
  • Item # 3HDX2
  • Mfr. Model # 3HDX2
  • Lock Nut, Nut Style Serrated Flange Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

Grade 2 Steel Lock Nut with 1/4"-20 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100

    Grade 2 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100
  • Item # 3HDU1
  • Mfr. Model # U12300.025.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

Grade 2 Steel Lock Nut with 5/16"-18 Dia./Thread&
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK100

    Grade 2 Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK100
  • Item # 3XTK3
  • Mfr. Model # U12300.031.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

Grade 2 Steel Lock Nut with #8-32 Dia./Thread Siz
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with #8-32 Dia./Thread Size; PK100

    Grade 2 Steel Lock Nut with #8-32 Dia./Thread Size; PK100
  • Item # 3HDT7
  • Mfr. Model # U12300.016.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

Grade 2 Steel Lock Nut with #6-32 Dia./Thread Siz
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with #6-32 Dia./Thread Size; PK100

    Grade 2 Steel Lock Nut with #6-32 Dia./Thread Size; PK100
  • Item # 3HDT6
  • Mfr. Model # U12300.013.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

18-8 Stainless Steel Lock Nut with 5/16"-18 Dia./
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK50

    18-8 Stainless Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK50
  • Item # 22RV97
  • Mfr. Model # U51738.031.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

Grade 8 Steel Lock Nut with 5/16"-18 Dia./Thread&
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 8 Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK100

    Grade 8 Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK100
  • Item # 3HDR6
  • Mfr. Model # U12450.031.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Yellow,...More

18-8 Stainless Steel Lock Nut with #6-32 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with #6-32 Dia./Thread Size; PK50

    18-8 Stainless Steel Lock Nut with #6-32 Dia./Thread Size; PK50
  • Item # 22RV93
  • Mfr. Model # U51738.013.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

316 Stainless Steel Lock Nut with 1/2"-13 Dia./Th
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 316 Stainless Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK10

    316 Stainless Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK10
  • Item # 1WY63
  • Mfr. Model # U55730.050.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

Grade 8 Steel Lock Nut with 1/4"-20 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 8 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100

    Grade 8 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100
  • Item # 3HDR5
  • Mfr. Model # U12450.025.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Yellow,...More

Grade 2 Steel Lock Nut with 1/4"-28 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 1/4"-28 Dia./Thread Size; PK100

    Grade 2 Steel Lock Nut with 1/4"-28 Dia./Thread Size; PK100
  • Item # 3HDU2
  • Mfr. Model # U12320.025.0002
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

Grade 2 Carbon Steel Lock Nut with 3/8"-16 Dia.&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Carbon Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50

    Grade 2 Carbon Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50
  • Item # 26LH69
  • Mfr. Model # U12300.037.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Carbon Steel, Fastener Finish Zinc...More

A2 Stainless Steel Lock Nut with M8-1.25 Dia./Thread S
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • A2 Stainless Steel Lock Nut with M8-1.25 Dia./Thread Size; PK50

    A2 Stainless Steel Lock Nut with M8-1.25 Dia./Thread Size; PK50
  • Item # 6CB72
  • Mfr. Model # M51730.080.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Metric, Stainless Steel, Fastener Finish...More

Grade 5 Carbon Steel Lock Nut with 3/8"-16 Dia.&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 5 Carbon Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50

    Grade 5 Carbon Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50
  • Item # 29DU67
  • Mfr. Model # U12348.037.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Carbon Steel, Fastener Finish Zinc...More

Grade 8 Carbon Steel Lock Nut with 1/2"-13 Dia.&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 8 Carbon Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK25

    Grade 8 Carbon Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK25
  • Item # 26LH90
  • Mfr. Model # U12450.050.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Carbon Steel, Fastener Finish Zinc...More

18-8 Stainless Steel Lock Nut with #10-24 Dia./Thread&
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with #10-24 Dia./Thread Size; PK50

    18-8 Stainless Steel Lock Nut with #10-24 Dia./Thread Size; PK50
  • Item # 22RV95
  • Mfr. Model # U51738.019.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

Grade 2 Steel Lock Nut with 1/2"-13 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK50

    Grade 2 Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK50
  • Item # 4FAY2
  • Mfr. Model # HFNI20500-050P
  • Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated, Fastener Thread Direction Right...More

Grade 8 Carbon Steel Lock Nut with 3/8"-16 Dia.&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 8 Carbon Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50

    Grade 8 Carbon Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50
  • Item # 26LH88
  • Mfr. Model # U12450.037.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Carbon Steel, Fastener Finish Zinc...More

18-8 Stainless Steel Lock Nut with #10-32 Dia./Thread&
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with #10-32 Dia./Thread Size; PK50

    18-8 Stainless Steel Lock Nut with #10-32 Dia./Thread Size; PK50
  • Item # 22RW06
  • Mfr. Model # U51411.019.0002
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

18-8 Stainless Steel Lock Nut with #8-32 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with #8-32 Dia./Thread Size; PK50

    18-8 Stainless Steel Lock Nut with #8-32 Dia./Thread Size; PK50
  • Item # 22RV94
  • Mfr. Model # U51738.016.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

Grade C Steel Lock Nut with 3/8"-16 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade C Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK100

    Grade C Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK100
  • Item # 4FAW6
  • Mfr. Model # SLI80371-100P
  • Lock Nut, Nut Style Deformed Thread Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Yellow,...More

Grade 8 Carbon Steel Lock Nut with 5/8"-11 Dia.&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 8 Carbon Steel Lock Nut with 5/8"-11 Dia./Thread Size; PK10

    Grade 8 Carbon Steel Lock Nut with 5/8"-11 Dia./Thread Size; PK10
  • Item # 26LH92
  • Mfr. Model # U12450.062.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Carbon Steel, Fastener Finish Zinc...More

Grade 2 Steel Lock Nut with 1/4"-20 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100

    Grade 2 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100
  • Item # 4EFX7
  • Mfr. Model # NLI20250NU-100P
  • Lock Nut, Nut Style Tooth Washer Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

A2 Stainless Steel Lock Nut with M10-1.50 Dia./Thread
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • A2 Stainless Steel Lock Nut with M10-1.50 Dia./Thread Size; PK50

    A2 Stainless Steel Lock Nut with M10-1.50 Dia./Thread Size; PK50
  • Item # 22RW65
  • Mfr. Model # M51730.100.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Metric, Stainless Steel, Fastener Finish...More

Grade 5 Steel Lock Nut with 1/4"-20 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 5 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100

    Grade 5 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100
  • Item # 5TJD2
  • Mfr. Model # U12348.025.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

Grade 2 Steel Lock Nut with #6-32 Dia./Thread Siz
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with #6-32 Dia./Thread Size; PK100

    Grade 2 Steel Lock Nut with #6-32 Dia./Thread Size; PK100
  • Item # 4EFZ4
  • Mfr. Model # KEPI0-60-100P
  • Lock Nut, Nut Style Tooth Washer Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

Grade 2 Steel Jam Lock Nut with #8-32 Dia./Thread
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Jam Lock Nut with #8-32 Dia./Thread Size; PK100

    Grade 2 Steel Jam Lock Nut with #8-32 Dia./Thread Size; PK100
  • Item # 4FJJ2
  • Mfr. Model # U12423.016.0001
  • Jam Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc...More

Results per page:  16 | 32 | 48

Use a locknut over or in place of a regular nut to resist loosening due to machine vibration or torque. There are two main types of lock nut. A nylon insert nut has a slightly smaller thread than the bolt to provide added grip. It is reusable but not recommended for high-temperature applications. A deformed thread locknut, as the name implies, has a distorted thread for added friction. Lock flange nuts have a toothed washer on the bottom for grip. Grainger has a large locknut selection to keep your machinery running at top efficiency.

Note: Product availability is real-time basis and adjusted continuously. The product will be reserved for you when you complete your order. More