1/4-28 18-8 Stainless Steel Nylon Insert Hex Lock Nuts – Fine Thread – Qty 20

SKU: 3126
Product Type: Nylon-insert (nyloc) hex lock nut
Thread Size: 1/4-28 UNF (fine), 28 TPI, right-hand
Thread Class: 2B (internal)
Material: 18-8 (304) stainless steel
Insert: Nylon 6/6 prevailing-torque ring
Finish: Plain stainless, typically passivated (no coating)
Across Flats (Wrench Size): 7/16 in (standard for 1/4″ hex)
Profile/Height: Prevailing-torque lock nut pattern (nylon insert)
Temperature Range (functional): −40°F to 250°F (limited by nylon)
Corrosion Resistance: Excellent for outdoor, marine, and industrial environments
Magnetism: Non-magnetic to slightly magnetic (typical for 18-8)
Standards/References: ASME B1.1 (threads), ASME B18.16.6 (nylon-insert locknuts), ASME B18.2.2 (hex form)
Reuse Guidance: Nylon insert may be reused a limited number of times; prevailing torque decreases with cycles
Recommended Mating Hardware: 1/4-28 stainless bolts/studs; optional stainless washers
Package Quantity: 20 nuts
 
SKU: 3126
Lock in a durable, vibration-resistant connection with 1/4-28 18-8 Stainless Steel Nylon Insert Hex Lock Nuts (Qty 20). The UNF 28 TPI fine thread provides higher clamping force and improved resistance to loosening, while the nylon insert (nyloc) delivers prevailing torque to keep assemblies tight in high-vibration environments.
Crafted from 18-8 (304) stainless steel, these lock nuts offer excellent corrosion resistance for automotive, marine, outdoor, and industrial use. Standard hex flats ensure easy wrench access and consistent torque. Pair with matching 1/4-28 stainless bolts or studs for a long-lasting, rust-resistant joint.
Pro tip: On stainless-to-stainless assemblies, a light coat of anti-seize helps reduce galling during higher-torque installs.
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