Skip Content

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

Filter Results By

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

Lock Nuts

1,306 Results Found that Include 1,307 Products

Results per page:  16 | 32 | 48
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 # 3HDX4
  • Mfr. Model # 3HDX4
  • Lock Nut, Nut Style Serrated Flange 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 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 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

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 #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 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

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 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 # 41MG60
  • Mfr. Model # U51108.025.0001
  • Lock Nut, Nut Style Serrated Flange Nut, System of Measurement Inch, Stainless Steel, Fastener Finish Plain,...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 C Steel Lock Nut with 1/2"-13 Dia./Thread&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Grade C Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK25 Grade C Steel Lock Nut with 1/2"-13 Dia./Thread Size; PK25
  • Item # 4CAL8
  • Mfr. Model # U12120.050.0001
  • Lock Nut, Nut Style Deformed Thread Lock Nut, System of Measurement Inch, Steel, Fastener Finish Phosphate...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

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; PK25 18-8 Stainless Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK25
  • Item # 4EGA7
  • Mfr. Model # 4EGA7
  • Lock Nut, Nut Style Tooth Washer Lock Nut, System of Measurement Inch, Stainless Steel, Fastener Finish...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

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

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

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

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 # 4EFZ5
  • 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 #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

Steel Lock Nut with #10-32 Dia./Thread Size; PK10
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Steel Lock Nut with #10-32 Dia./Thread Size; PK100 Steel Lock Nut with #10-32 Dia./Thread Size; PK100
  • Item # 4EFZ7
  • Mfr. Model # 4EFZ7
  • Lock Nut, Nut Style Tooth Washer Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

Class 8 Carbon Steel Lock Nut with M30-3.50 Dia./Threa
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Class 8 Carbon Steel Lock Nut with M30-3.50 Dia./Thread Size; PK5 Class 8 Carbon Steel Lock Nut with M30-3.50 Dia./Thread Size; PK5
  • Item # 26LJ82
  • Mfr. Model # M12350.300.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Metric, Carbon Steel, Fastener Finish Zinc...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 # 4FHT6
  • Mfr. Model # U12411.025.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Inch, Steel, Fastener Finish Plain, Fastener...More

18-8 Stainless Steel Lock Nut with 1"-8 Dia./Thread&#x
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 18-8 Stainless Steel Lock Nut with 1"-8 Dia./Thread Size; PK5 18-8 Stainless Steel Lock Nut with 1"-8 Dia./Thread Size; PK5
  • Item # 22RW02
  • Mfr. Model # U51738.100.0001
  • 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

Class 5 Steel Lock Nut with M4-0.70 Dia./Thread Size&#
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • Class 5 Steel Lock Nut with M4-0.70 Dia./Thread Size; PK100 Class 5 Steel Lock Nut with M4-0.70 Dia./Thread Size; PK100
  • Item # 4CAG1
  • Mfr. Model # M12300.040.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Metric, 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 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 # 4CAP1
  • Mfr. Model # 4CAP1
  • 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 # 4CAK1
  • Mfr. Model # 4CAK1
  • Lock Nut, Nut Style Tooth Washer Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

A2 Stainless Steel Lock Nut with M5-0.80 Dia./Thread S
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • A2 Stainless Steel Lock Nut with M5-0.80 Dia./Thread Size; PK50 A2 Stainless Steel Lock Nut with M5-0.80 Dia./Thread Size; PK50
  • Item # 26WC51
  • Mfr. Model # M51730.050.0001
  • Lock Nut, Nut Style Nylon Insert Lock Nut, System of Measurement Metric, 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 # 4FAY2
  • Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated, Fastener Thread Direction Right...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 # 4EFZ8
  • Lock Nut, Nut Style Tooth Washer Lock Nut, System of Measurement Inch, Steel, Fastener Finish Zinc Plated,...More

316 Stainless Steel Lock Nut with 3/8"-16 Dia./Th
  • TM

    Grainger Choice

  • GRAINGER APPROVED
  • 316 Stainless Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50 316 Stainless Steel Lock Nut with 3/8"-16 Dia./Thread Size; PK50
  • Item # 26LJ13
  • Mfr. Model # U55730.037.0001
  • 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