2,625 Piece Grade 8 UNC Hex Head Cap Screw Assortment Refill

• Grade 8 hex head cap screws — 1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14, and 1/2"-13, multiple lengths per size
• Grade 8 hex nuts — matching every bolt size in the kit
• Extra-thick SAE flat washers — one set per diameter
• High-alloy lock washers — one set per diameter
• 2,625 pieces total
• Storage is not included — designed for customers who already own a 40-hole bin

Thread standard	UNC — Unified National Coarse
Grade	SAE J429 Grade 8
Tensile strength	150,000 PSI minimum
Finish	Yellow zinc
Diameters	1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13
Flat washer type	Extra-thick SAE (narrower OD, greater thickness than normal USS or SAE flat washers)
Total pieces	2,625
Storage included	No — for customers who already own a 40-hole bin
Compatible storage	40-hole metal bin (included with corresponding Starter Kit)

• SAE washer applications — SAE flat washers have a smaller outer diameter than USS flat washers and are specified in many OEM and equipment service manuals; if your work calls for SAE, this kit matches that spec exactly
• Tighter bolt patterns — the narrower OD of SAE flat washers fits in recessed holes and tight flange areas where a standard USS washer won't clear
• Heavy equipment and structural assemblies — extra thickness adds load-bearing capability in high-clamping-force applications alongside Grade 8 bolts
• Existing bin owners — if you already have a 40-hole metal bin, this refill restocks it completely with the SAE washer spec without paying for new storage

Looking for USS flat washers instead? The Grade 8 UNC Refill with USS Flat Washers covers the same bolt and nut sizes with a larger-OD washer. Both refills are priced for customers who already own a 40-hole bin.

Don't have a bin yet? The Grade 8 UNC Extra-Thick SAE Starter Kit includes both the fasteners and the 40-hole metal bin.

	Starter Kit	This Refill
Fasteners (2,625 pcs)	✓	✓
Extra-thick SAE flat washers	✓ Included	✓ Included
40-hole metal bin	✓ Included	— Already own one
QR-coded labels	✓ Included	✓ Included

If this is your first purchase, the Starter Kit is the right choice. If you're restocking an existing 40-hole bin, this refill gets you back to full without the cost of new storage.

• Ships within 1–2 business days from our warehouse
• Volume pricing available — save up to 20% when ordering 3 or more
• Reorder regularly? Ask us about a B2B account with a quarterly restock cadence and custom pricing — contact us