825 Piece Grade 18.8 Stainless Steel Hex Head Cap Screw, Nut, and Washer Assortment Refill

• 18.8 stainless steel hex head cap screws — 1/4"-20, 5/16"-18, and 3/8"-16, multiple lengths per size
• 18.8 stainless hex nuts — matching every bolt size
• Stainless flat washers and lock washers — one set per diameter
• 825 pieces total
• Storage is not included — designed for customers who already own it

• Existing bin owners — restocks the 24-hole Class 8.8 drawer completely without buying storage you already have
• High-volume shops — businesses with equipment exposed to corrosive environments that cycle through stainless steel fasteners regularly
• Multi-station operations — shops with stainless steel storage at multiple stations that need to replenish fasteners only

Don't have a drawer yet? The 825-Piece Stainless Steel Starter Kit includes both the fasteners and the labeled 24-hole metal drawer.

18.8 refers to the alloy composition: 18% chromium and 8% nickel (AISI 304). The chromium forms a passive oxide layer on the surface that prevents rust — even without a plating or coating. Unlike zinc-plated carbon steel, the corrosion resistance of 18.8 stainless doesn't wear off over time or with scratches.

The tradeoff is tensile strength. At 70,000–85,000 PSI, 18.8 stainless is not a high-strength fastener — it's below Grade 5 and well below Grade 8. Use it where corrosion resistance is the primary requirement, not strength. For high-strength corrosion-resistant applications (like marine structural work), specify 316 stainless or Grade B8 instead.

Note on galling: Stainless steel fasteners can gall (seize) when threading into stainless nuts at high torque. Apply an anti-seize lubricant when assembling stainless-to-stainless joints to prevent this.

For carbon steel assortments with plated corrosion resistance, see our Grade 8 UNC and Grade 8 UNF kits.

First time buying? Go with the Starter Kit. Already have the drawer? This refill saves you money.