Skip Content

Want to pay an invoice? Please call us at 1-800-GRAINGER (1-800-472-4643).

Filter Results By

Branch Availability
Item
Nut Style
System of Measurement
Basic Material
Fastener Finish
Fastener Thread Direction
Dia./Thread Size
Material Grade
Width Across Flats
Nut Height
Nut Standards
Brand
Price
Shop By

Lock Nuts

1,301 Results Found that Include 1,304 Products

Results per page:  16 | 32 | 48
Grade 2 Steel Lock Nut with 5/8"-11 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 5/8"-11 Dia./Thread Size; PK10 Grade 2 Steel Lock Nut with 5/8"-11 Dia./Thread Size; PK10
  • Item # 22RV63
  • Mfr. Model # U12300.062.0001
  • 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 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

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 8.8 Steel Lock Nut with 1/4"-20 Dia./Thread
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 8.8 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100 Grade 8.8 Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK100
  • Item # 4EFZ8
  • Mfr. Model # KEPI0250-100P
  • Lock Nut, Nut Style Tooth Washer 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

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

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

316 Stainless Steel Lock Nut with 1/4"-20 Dia./Th
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 316 Stainless Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK50 316 Stainless Steel Lock Nut with 1/4"-20 Dia./Thread Size; PK50
  • Item # 1WY55
  • Mfr. Model # U55730.025.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

18-8 Stainless Steel Lock Nut with 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 5/8"-11 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 5/8"-11 Dia./Thread Size; PK25 Grade 2 Steel Lock Nut with 5/8"-11 Dia./Thread Size; PK25
  • Item # 12P610
  • Mfr. Model # 12P610
  • 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 #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

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

Nylon Lock Nut with #10-32 Dia./Thread Size; PK25
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Nylon Lock Nut with #10-32 Dia./Thread Size; PK25 Nylon Lock Nut with #10-32 Dia./Thread Size; PK25
  • Item # 4AGE9
  • Mfr. Model # 0701032LN
  • Lock Nut, System of Measurement Inch, Nylon, Fastener Finish Plain, Fastener Thread Direction Right Hand,...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

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

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

    Grainger Choice

  • GRAINGER APPROVED
  • 316 Stainless Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK50 316 Stainless Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK50
  • Item # 1WY57
  • Mfr. Model # U55730.031.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

Grade 2 Steel Jam Lock Nut with #10-24 Dia./Threa
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Jam Lock Nut with #10-24 Dia./Thread Size; PK100 Grade 2 Steel Jam Lock Nut with #10-24 Dia./Thread Size; PK100
  • Item # 4FJJ3
  • Mfr. Model # U12423.019.0001
  • Jam Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc...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

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 5/8"-11 Dia./T
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with 5/8"-11 Dia./Thread Size; PK10 18-8 Stainless Steel Lock Nut with 5/8"-11 Dia./Thread Size; PK10
  • Item # 3PDH8
  • Mfr. Model # U51738.062.0001
  • 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 # 4FHT8
  • Mfr. Model # U12411.031.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Plain, Fastener...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 3/8"-16 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK100 Grade 2 Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK100
  • Item # 3HDU4
  • Mfr. Model # 3HDU4
  • Lock Nut, Nut Style Tooth Washer Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

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

    Grainger Choice

  • GRAINGER APPROVED
  • Grade C Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK100 Grade C Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK100
  • Item # 4FAU2
  • Mfr. Model # U12920.031.0001
  • Lock Nut, Nut Style Deformed Thread Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Yellow,...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

Class 5 Steel Lock Nut with M5-0.80 Dia./Thread Size&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Class 5 Steel Lock Nut with M5-0.80 Dia./Thread Size; PK100 Class 5 Steel Lock Nut with M5-0.80 Dia./Thread Size; PK100
  • Item # 4CAG2
  • Mfr. Model # M12300.050.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Metric, Steel, Fastener Finish Zinc Plated,...More

Grade 5 Low Carbon Steel Lock Nut with 1/2"-13&#x
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 5 Low Carbon Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK100 Grade 5 Low Carbon Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK100
  • Item # 5TJD6
  • Mfr. Model # 5TJD6
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Low Carbon Steel, Fastener Finish Zinc...More

Grade 2 Steel Jam Lock Nut with 1-1/4"-12 Dia.&#x
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade 2 Steel Jam Lock Nut with 1-1/4"-12 Dia./Thread Size; PK5 Grade 2 Steel Jam Lock Nut with 1-1/4"-12 Dia./Thread Size; PK5
  • Item # 22RW23
  • Mfr. Model # U12380.125.0002
  • Jam Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc...More

Class 5 Steel Lock Nut with M8-1.25 Dia./Thread Size&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Class 5 Steel Lock Nut with M8-1.25 Dia./Thread Size; PK100 Class 5 Steel Lock Nut with M8-1.25 Dia./Thread Size; PK100
  • Item # 4CAG5
  • Mfr. Model # M12300.080.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Metric, 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; PK25 18-8 Stainless Steel Lock Nut with 5/16"-18 Dia./Thread Size; PK25
  • Item # 4EFZ1
  • Mfr. Model # KEPIX031-025P
  • Lock Nut, Nut Style Tooth Washer Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...More

18-8 Stainless Steel Jam Lock Nut with #10-32 Dia.
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Jam Lock Nut with #10-32 Dia./Thread Size; PK50 18-8 Stainless Steel Jam Lock Nut with #10-32 Dia./Thread Size; PK50
  • Item # 4FJE3
  • Mfr. Model # U51422.019.0002
  • Jam Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...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