1,025 Piece Grade 8 UNF Hex Head Cap Screw, Nut, and Washer Assortment Refill
The same 1,025-piece Grade 8 UNF assortment as the Starter Kit — without the drawer. For customers who already own the 24-hole large metal drawer from the Grade 8 UNF Starter Kit, this refill restocks 1/4"-28 through 1/2"-20 fine-thread hex cap screws, hex nuts, and washers without paying for storage you already have.
What's Included
- Grade 8 hex head cap screws — 1/4"-28, 5/16"-24, 3/8"-24, and 1/2"-20, multiple lengths per size
- Grade 8 hex nuts — matching every bolt size in the kit
- Flat washers and high-alloy lock washers — one set per diameter
- 1,025 pieces total
- Storage is not included — designed for customers who already own a 24-hole large metal drawer
Specifications
| Thread standard | UNF — Unified National Fine |
| Grade | SAE J429 Grade 8 |
| Tensile strength | 150,000 PSI minimum |
| Finish | Yellow zinc |
| Sizes included | 1/4"-28, 5/16"-24, 3/8"-24, 1/2"-20 |
| Total pieces | 1,025 |
| Storage included | No — for customers who already own a 24-hole large metal drawer |
| Compatible storage | 24-hole large metal drawer (included with the Grade 8 UNF Starter Kit) |
| SKU | ASSTHHCS24F8REFILL |
Best For
- Existing 24-hole drawer owners — if you already have a 24-hole large metal drawer from the Grade 8 UNF Starter Kit, this refill restocks it completely
- Automotive repair shops — suspension, steering, drivetrain, and engine work that goes through fine-thread Grade 8 hardware regularly
- Aerospace and precision mechanical shops — fine thread is standard for applications where vibration resistance and precise torque control are required
- Multi-station operations — teams with drawers set up across the shop that need to replenish fasteners, not storage
Don't have a drawer yet? The Grade 8 UNF Starter Kit includes both the 1,025-piece fastener assortment and the 24-hole large metal drawer — everything you need to get organized from scratch.
Fine Thread vs. Coarse Thread
UNF (fine thread) has more threads per inch than UNC (coarse thread), which gives it two practical advantages in the right applications:
- Better vibration resistance — more thread engagement reduces the tendency to loosen under cyclic load
- Finer torque adjustment — smaller thread pitch allows more precise clamping force control during assembly
Use fine thread for engine and suspension components, steering linkages, precision machinery, and anywhere vibration or repeated disassembly is a factor. Use coarse thread for general structural connections where assembly speed matters more.
See our Grade 8 UNC Assortment for the coarse-thread companion kit.
Starter Kit vs. Refill — Which Do I Need?
| Starter Kit | This Refill | |
| Fasteners (1,025 pcs) | ✓ | ✓ |
| Flat and lock washers | ✓ | ✓ |
| 24-hole large metal drawer | ✓ Included | — Already own one |
| QR-coded layout | ✓ Included | — Already have it |
If this is your first purchase, the Grade 8 UNF Starter Kit is the right choice. If you're restocking an existing 24-hole drawer, this refill provides the full fastener load without paying for storage twice.
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
- Reorder regularly? Ask us about a B2B account with a quarterly restock cadence and custom pricing — contact us