3,575 Grade 8 UNC Hex Head Cap Screw, Nut, and Washer Assortment Refill
SKU ASST80C8/ASLNR
The same 3,575-piece Grade 8 coarse-thread assortment as the Starter Kit — without the storage. This version pairs Grade 8 hex head cap screws with all-steel lock nuts for high-temperature or heavy-duty applications where nylon-insert lock nuts aren't rated for the job. If you already own storage, this refill restocks it without paying for storage you already have.
What's Included
- Grade 8 hex head cap screws — 1/4"-20 through 3/4"-10 UNC, multiple lengths per diameter
- Grade 8 hex nuts — matching every bolt size in the kit
- All-steel prevailing-torque lock nuts — matching every bolt diameter, for high-temperature and high-torque applications
- SAE flat washers and high-alloy lock washers — one set per diameter
- 3,575 pieces total
- Storage is not included — designed for customers who already own it
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 |
| Lock nut type | All-steel prevailing-torque — rated above 250°F, reusable through more cycles than nylon-insert |
| Total pieces | 3,575 |
| Approx. weight | ~90 lbs |
| Storage included | No — for customers who already own the storage |
| Compatible storage | Two 40-hole metal bins (included with the 3,575-Piece Grade 8 All-Steel Lock Nut Starter Kit) |
Best For
- Existing storage owners — if you already have storage that fit the fasteners, this refill restocks it completely without the added cost of new storage
- High-temperature environments — all-steel lock nuts hold prevailing torque above 250°F, making them the right choice for engine compartments, exhaust systems, and industrial machinery where nylon-insert nuts would fail
- Heavy-duty reassembly — all-steel lock nuts can be reinstalled more times than nylon-insert before losing their prevailing-torque hold, making them better suited for fasteners that get removed and re-torqued regularly
- Fleet and industrial maintenance teams — shops that cycle through Grade 8 coarse-thread fasteners at high volume and need temperature-rated hardware across their inventory
Don't have storage yet? The 3,575-Piece Grade 8 UNC All-Steel Lock Nut Starter Kit includes both the fasteners and two 40-hole metal bins — everything you need to get organized from scratch.
Starter Kit vs. Refill — Which Do I Need?
| Starter Kit | This Refill | |
| Fasteners (3,575 pcs) | ✓ | ✓ |
| All-steel lock nuts | ✓ | ✓ |
| Storage | ✓ Included | — Already own |
| QR-coded labels | ✓ Included | ✓ Included |
If this is your first purchase, the Starter Kit is the right choice. If you're restocking existing storage, this refill gives you the full fastener load without paying for storage twice.
Shipping & Ordering
- Ships within 1–2 business days from our warehouse
- Free shipping on orders $50 and over
- 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
Buy More, Save More
$1081.67
/ kit
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5% off
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