Skip to content
Free shipping on orders $250 and up!
Free shipping on orders $250 and up!

Lock Nuts

  • 5/16"-24 Zinc Plated Grade 2 Steel Fine Thread Top Lock Nuts
    $10.07 - $10.07
    $10.07
    $10.07 - $10.07
    $10.07

    5/16"-24 Zinc Plated Grade 2 Steel Fine Thread Top Lock Nuts (12 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 17/64"Material: SteelFinish: ZincDriver Type: 1/2" WrenchThread Size: 24 (Fine)Hardness: Grade 2Style: T...

    View full details
    $10.07 - $10.07
    $10.07
    $10.07 - $10.07
    $10.07
  • 1/8IP x 1/2" Brass Lock Nuts
    $9.95 - $9.95
    $9.95
    $9.95 - $9.95
    $9.95

    1/8IP x 1/2" Brass Lock Nuts (10 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 1/8IPDiameter 2: 9/16"Thickness: 1/8"Material: BrassDriver Type: 1/2" WrenchType: Lock NutBox of 10.A lock nut is a nut that resists loos...

    View full details
    $9.95 - $9.95
    $9.95
    $9.95 - $9.95
    $9.95
  • 5/16"-18 18-8 Stainless Steel Coarse Thread Keps Lock Nuts
    $11.45 - $11.45
    $11.45
    $11.45 - $11.45
    $11.45

    5/16"-18 18-8 Stainless Steel Coarse Thread Keps Lock Nuts (10 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 11/32"Material: Stainless SteelDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: 18-8Style: KepT...

    View full details
    $11.45 - $11.45
    $11.45
    $11.45 - $11.45
    $11.45
  • 5/16"-24 Black Chrome Plated Steel Fine Thread Nylon Insert Lock Nuts
    $12.82 - $12.82
    $12.82
    $12.82 - $12.82
    $12.82

    5/16"-24 Black Chrome Plated Steel Fine Thread Nylon Insert Lock Nuts (6 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 11/32"Material: SteelFinish: Black ChromeDriver Type: 1/2" WrenchThread Size: 24 (Fine)Style: Nylon Inse...

    View full details
    $12.82 - $12.82
    $12.82
    $12.82 - $12.82
    $12.82
  • 5/16"-18 Black Phosphate Grade 2 Steel Coarse Thread Nylon Insert Lock Nuts
    $36.74 - $36.74
    $36.74
    $36.74 - $36.74
    $36.74

    5/16"-18 Black Phosphate Grade 2 Nylon Insert Lock Nuts (452 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 23/64"Material: SteelFinish: Black PhosphateDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: Gr...

    View full details
    $36.74 - $36.74
    $36.74
    $36.74 - $36.74
    $36.74
  • 5/16"-24 Zinc Plated Grade 2 Steel Fine Thread Nylon Insert Lock Nuts
    $10.10 - $12.97
    $10.10 - $12.97
    $10.10 - $12.97
    $10.10

    5/16"-24 Zinc Plated Grade 2 Steel Fine Thread Nylon Insert Lock Nuts

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 23/64"Material: SteelFinish: ZincDriver Type: 1/2" WrenchThread Size: 24 (Fine)Hardness: Grade 2Style: N...

    View full details
    $10.10 - $12.97
    $10.10 - $12.97
    $10.10 - $12.97
    $10.10
  • 5/16"-18 Zinc Plated Grade 2 Steel Coarse Thread Kep Lock Nuts
    $10.56 - $18.12
    $10.56 - $18.12
    $10.56 - $18.12
    $10.56

    5/16"-18 Zinc Plated Grade 2 Steel Coarse Thread Kep Lock Nuts

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 17/64"Material: SteelFinish: ZincDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: Grade 2Style:...

    View full details
    $10.56 - $18.12
    $10.56 - $18.12
    $10.56 - $18.12
    $10.56
  • 5/16"-18 Zinc Plated Grade 8 Steel Coarse Thread Nylon Insert Lock Nuts
    $15.45 - $16.20
    $15.45 - $16.20
    $15.45 - $16.20
    $15.45

    5/16"-18 Zinc Plated Grade 8 Steel Coarse Thread Nylon Insert Lock Nuts

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 23/64"Material: SteelFinish: Yellow ZincDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: Grade ...

    View full details
    $15.45 - $16.20
    $15.45 - $16.20
    $15.45 - $16.20
    $15.45
  • 5/16"-18 Zinc Plated Grade 2 Steel Coarse Thread Lock Nuts
    $9.81 - $14.17
    $9.81 - $14.17
    $9.81 - $14.17
    $9.81

    5/16"-18 Zinc Plated Grade 2 Steel Coarse Thread Lock Nuts

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 17/64"Material: SteelFinish: ZincDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: Grade 2Style:...

    View full details
    $9.81 - $14.17
    $9.81 - $14.17
    $9.81 - $14.17
    $9.81
  • $10.08 - $22.36
    $10.08 - $22.36
    $10.08 - $22.36
    $10.08

    5/16"-18 18-8 Stainless Steel Coarse Thread Nylon Insert Lock Nuts

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 11/32"Material: Stainless SteelDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: 18-8Style: Waxe...

    View full details
    $10.08 - $22.36
    $10.08 - $22.36
    $10.08 - $22.36
    $10.08
  • 5/16"-18 Zinc Plated Grade 2 Steel Coarse Thread Nylon Insert Lock Nuts
    $13.31 - $13.31
    $13.31
    $13.31 - $13.31
    $13.31

    5/16"-18 Zinc Plated Grade 2 Steel Coarse Thread Nylon Insert Lock Nuts

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 23/64"Material: SteelFinish: ZincDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: Grade 2Style:...

    View full details
    $13.31 - $13.31
    $13.31
    $13.31 - $13.31
    $13.31
  • 5/16"-18 18-8 Stainless Steel Coarse Thread Nylon Insert Lock Nuts
    $11.26 - $12.40
    $11.26 - $12.40
    $11.26 - $12.40
    $11.26

    5/16"-18 18-8 Stainless Steel Coarse Thread Nylon Insert Lock Nuts

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 11/32"Material: Stainless SteelDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: 18-8Style: Waxe...

    View full details
    $11.26 - $12.40
    $11.26 - $12.40
    $11.26 - $12.40
    $11.26
  • 5/16"-18 Zinc Plated Grade 5 Steel Coarse Thread Flange Lock Nuts
    $10.65 - $10.65
    $10.65
    $10.65 - $10.65
    $10.65

    5/16"-18 Zinc Plated Grade 5 Steel Coarse Thread Flange Lock Nuts (15 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 11/16"Thickness: 3/8"Material: SteelFinish: ZincDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: Grade 5Style: ...

    View full details
    $10.65 - $10.65
    $10.65
    $10.65 - $10.65
    $10.65
  • 5/16"-18 Polished 18-8 Stainless Steel Coarse Thread Nylon Insert Lock Nuts
    $12.82 - $12.82
    $12.82
    $12.82 - $12.82
    $12.82

    5/16"-18 Polished 18-8 Stainless Nylon Insert Lock Nuts (6 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 11/32"Material: Stainless SteelFinish: PolishedDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness:...

    View full details
    $12.82 - $12.82
    $12.82
    $12.82 - $12.82
    $12.82
  • 5/16"-24 Polished 18-8 Stainless Steel Fine Thread Nylon Insert Lock Nuts
    Sold out
    $12.82 - $12.82
    $12.82
    $12.82 - $12.82
    $12.82

    5/16"-24 Polished 18-8 Stainless Nylon Insert Lock Nuts (6 pcs.)

    Monster Fastener
    Out of stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 11/32"Material: Stainless SteelFinish: PolishedDriver Type: 1/2" WrenchThread Size: 24 (Fine)Hardness: 1...

    View full details
    $12.82 - $12.82
    $12.82
    $12.82 - $12.82
    $12.82
    Sold out
  • 5/16"-18 18-8 Stainless Steel Coarse Thread Thin Pattern Lock Nuts
    $9.91 - $9.91
    $9.91
    $9.91 - $9.91
    $9.91

    5/16"-18 18-8 Stainless Steel Coarse Thread Thin Pattern Lock Nuts (10 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 1/4"Material: Stainless SteelDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: 18-8Style: Thin P...

    View full details
    $9.91 - $9.91
    $9.91
    $9.91 - $9.91
    $9.91
  • 5/16"-18 18-8 Stainless Steel Coarse Thread Serrated Lock Nuts
    $8.74 - $8.74
    $8.74
    $8.74 - $8.74
    $8.74

    5/16"-18 18-8 Stainless Steel Coarse Thread Serrated Lock Nuts (8 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 9/32"Material: Stainless SteelDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: 18-8Style: Serra...

    View full details
    $8.74 - $8.74
    $8.74
    $8.74 - $8.74
    $8.74
  • 5/16"-24 18-8 Stainless Steel Fine Thread Serrated Lock Nuts
    $10.02 - $10.02
    $10.02
    $10.02 - $10.02
    $10.02

    5/16"-24 18-8 Stainless Steel Fine Thread Serrated Lock Nuts (6 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 9/32"Material: Stainless SteelDriver Type: 1/2" WrenchThread Size: 24 (Fine)Hardness: 18-8Style: Serrate...

    View full details
    $10.02 - $10.02
    $10.02
    $10.02 - $10.02
    $10.02
  • 5/16"-18 Black Chrome Plated Steel Coarse Thread Nylon Insert Lock Nuts
    $12.82 - $12.82
    $12.82
    $12.82 - $12.82
    $12.82

    5/16"-18 Black Chrome Nylon Insert Lock Nuts (6 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 11/32"Material: SteelFinish: Black ChromeDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Style: Nylon In...

    View full details
    $12.82 - $12.82
    $12.82
    $12.82 - $12.82
    $12.82
  • 5/16"-18 18-8 Stainless Steel Coarse Thread Type C Lock Nuts
    $12.63 - $12.63
    $12.63
    $12.63 - $12.63
    $12.63

    5/16"-18 18-8 Stainless Steel Coarse Thread Type C Lock Nuts (12 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 9/32"Material: Stainless SteelDriver Type: 1/2" WrenchThread Size: 18 (Coarse)Hardness: 18-8Style: Type ...

    View full details
    $12.63 - $12.63
    $12.63
    $12.63 - $12.63
    $12.63
  • 5/16"-24 18-8 Stainless Steel Fine Thread Type C Lock Nuts
    $12.72 - $12.72
    $12.72
    $12.72 - $12.72
    $12.72

    5/16"-24 18-8 Stainless Steel Fine Thread Type C Lock Nuts (10 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 9/32"Material: Stainless SteelDriver Type: 1/2" WrenchThread Size: 24 (Fine)Hardness: 18-8Style: Type CT...

    View full details
    $12.72 - $12.72
    $12.72
    $12.72 - $12.72
    $12.72
  • 5/16"-24 Zinc Plated Grade 2 Steel Fine Thread Kep Lock Nuts
    $9.13 - $9.13
    $9.13
    $9.13 - $9.13
    $9.13

    5/16"-24 Zinc Plated Grade 2 Steel Fine Thread Kep Lock Nuts (12 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 9/16"Thickness: 17/64"Material: SteelFinish: ZincDriver Type: 1/2" WrenchThread Size: 24 (Fine)Hardness: Grade 2Style: K...

    View full details
    $9.13 - $9.13
    $9.13
    $9.13 - $9.13
    $9.13
  • 5/16"-24 Zinc Plated Steel Fine Thread Serrated Lock Nuts
    $8.94 - $8.94
    $8.94
    $8.94 - $8.94
    $8.94

    5/16"-24 Zinc Plated Steel Fine Thread Serrated Lock Nuts (12 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: 5/16"Diameter 2: 11/16"Thickness: 9/32"Material: SteelFinish: ZincDriver Type: 1/2" WrenchThread Size: 24 (Fine)Style: SerratedType: Flan...

    View full details
    $8.94 - $8.94
    $8.94
    $8.94 - $8.94
    $8.94
  • #12-24 Zinc Plated Grade 2 Steel Coarse Thread Nylon Insert Lock Nuts
    $11.19 - $11.19
    $11.19
    $11.19 - $11.19
    $11.19

    #12-24 Zinc Grade 2 Nylon Insert Lock Nuts (50 pcs.)

    Monster Fastener
    10+ in stock

    Diameter: #12Diameter 2: 1/2"Thickness: 21/64"Material: SteelFinish: ZincDriver Type: 1/2" WrenchThread Size: 24 (Coarse)Hardness: Grade 2Style: Ny...

    View full details
    $11.19 - $11.19
    $11.19
    $11.19 - $11.19
    $11.19