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200 Pack 5/16"-18 Grade 8 Hex Flange Lock Nuts, Serrated Flange
✅ In stock
F
Grade
⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.
Check Deal at Amazon
Price verified Sep 22, 2026 5:41 AM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
0/22
Market Standing
0/20
Deal Strength
0/20
Momentum
0/10
📝 Product Overview
🏪 Sold by
Yollyun
📦 Fulfillment
Fulfilled by Amazon
🚚 Shipping
Free Shipping
Product Details
✓Bulk up Your Toolkit: this bulk package inclueds 200 serrated hex flange lock nuts, ideal for repair shops, factory maintenance, automotive service, equipment assembly, and bulk stocking for home garages; This large volume pack works for high frequency consumption scenarios than smaller sets
✓5/16"-18 Unc Coarse Thread: the 5/16 lock nut features the 5/16"-18 UNC coarse thread, compatible with 5/16"-18 UNC coarse thread bolts, screws and studs, designed for common imperial fastening systems; Please confirm your existing bolt diameter and thread pitch before purchase to prevent mismatches with 5/16"-24 fine thread fasteners or hardware
✓High Strength: made of grade 8 high strength carbon steel, the 5/16"-18 serrated hex flange lock nuts ensure durability and integrity, with vibrant yellow zinc finish, corrosion resistant, not easy to wear, ideal for applications requiring high clamping strength, such as machinery repair, automotive parts fixing, agricultural equipment, metal brackets, and industrial maintenance, compared to standard low strength nuts, suitable for fastening connections that withstand higher clamping forces
✓Locking Power: the flange lock nut features the serrated flange at the bottom; Once tightened, the serrated flange surface engage with the contact surfaces, helping reduce the risk of loosening in vibration environments; The built in flange acts as a integrated washer, expanding the stress area and delivering enhanced mounting stability
✓Versatile Use: the flange nuts are a fit for a variety of applications, such as automotive, construction, machinery projects, high vibration industrial equipment, vehicle frames, engines, and structural assemblies requireing high torque fastening, providing reliable solutions in diverse scenarios
⚙️ Specifications
Material
Carbon Steel
Fastener Type
Flange, Hex, Lock
Thread Size
about 5/16"-18
Exterior Finish
Zinc
Color
Serrated Flange
Thread Type
Unified National Coarse
Inside Thread Size
5/16"-18
Thread Class
UNC
Screw Head Style
Hex
Grade Rating
Grade 8
Item Dimensions
5.12 x 3.54 x 1.57 inches
