3,110 Piece Grade 8 Hex Head Cap Screw, Nut, and Washer Assortment Starter Kit
When a maintenance facility or construction operation needs Grade 8 coarse-thread bolts from 1/4" all the way to 3/4" — covering light chassis hardware, mid-range structural connections, and heavy equipment fasteners in a single organized setup — this 3,110-piece starter kit stocks two 40-hole metal bins with all eight UNC diameters.
What's Included
- Grade 8 hex head cap screws — 1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13, 9/16"-12, 5/8"-11, and 3/4"-10, multiple lengths per diameter
- Grade 8 hex nuts — matching every bolt size in the kit
- USS flat washers and high-alloy lock washers — one set per diameter
- Two 40-hole metal bins — ready to stock
- 3,110 pieces total
Specifications
| 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, 9/16"-12, 5/8"-11, 3/4"-10 |
| Washer standard | USS |
| Total pieces | 3,110 |
| Approx. weight | ~239 lbs |
| SKU | ASST72C8 |
Best For
- Heavy equipment maintenance — tractors, cranes, excavators, and commercial trucks that require Grade 8 hardware across a full range of bolt sizes
- Fleet shops servicing light- and heavy-duty vehicles — one kit covers the entire 1/4" through 3/4" UNC range without stocking multiple smaller assortments
- Structural steel and construction teams — from small mounting bolts to 3/4" connection hardware, all in one organized bin setup
- Agricultural operations — large equipment repair and implement maintenance requiring Grade 8 strength across multiple diameters
- Industrial maintenance departments — facilities that need a complete high-strength UNC inventory without managing individual SKUs
About Grade 8
Grade 8 is the highest-strength SAE fastener grade commonly stocked in repair and industrial environments. At 150,000 PSI minimum tensile strength, it's the right choice for high-stress connections, structural applications, and anywhere Grade 5 isn't strong enough.
The yellow zinc finish provides corrosion resistance for indoor shop storage and outdoor or under-hood applications. UNC coarse thread is the standard for most structural and heavy-duty work — faster to assemble than fine thread and less prone to cross-threading in the field.
Need fine thread for suspension, engine, or precision applications? See our Grade 8 UNF Assortment. If you already own a 72-hole bin and just need to restock, the Grade 8 UNC 72-Hole Refill has the same 3,110 pieces without the bins.
Starter Kit vs. Refill — Which Do I Need?
| Starter Kit | Refill | |
| Fasteners (3,110 pcs) | ✓ | ✓ |
| USS flat and lock washers | ✓ | ✓ |
| Two 40-hole metal bins | ✓ Included | — Already own them |
| QR-coded labels | ✓ Included | — Already have them |
If this is your first purchase, this Starter Kit is the right choice. If you're restocking an existing 72-hole bin setup, the Grade 8 UNC 72-Hole Refill provides the full fastener load without new storage.
Shipping & Ordering
- Ships within 1–2 business days from our warehouse
- Volume pricing available — contact us for multi-kit pricing on orders of 3 or more
- B2B accounts: Fleet managers, facilities teams, and industrial maintenance operations can apply for a business account with custom pricing and a dedicated rep — contact us to get started