1,025 Piece Grade 8 UNF Hex Head Cap Screw, Nut, and Washer Assortment Starter Kit
Fine-thread Grade 8 bolts hold tighter under vibration — which is why they're the standard for automotive, aerospace, and precision mechanical applications. This 1,025-piece UNF assortment covers 1/4" through 1/2" fine-thread sizes in a labeled 24-hole metal bin.
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
- 24-hole metal bin — pre-labeled and ready to stock
- 1,025 pieces total
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 |
| Approx. weight | 25 lbs |
| SKU | ASSTHHCS24F8 |
Best For
- Automotive repair — suspension, steering, drivetrain, and engine work where vibration resistance is critical
- Aircraft and aerospace maintenance — fine thread is standard in most aviation fastener applications
- Precision manufacturing — assembly environments requiring fine torque control and tighter clamping force
- Shops building a complete Grade 8 inventory — coarse thread for structural work, fine thread for automotive and precision applications
Fine Thread vs. Coarse Thread
UNF (fine thread) has more threads per inch than UNC (coarse thread), giving it two advantages in the right applications:
- Better vibration resistance — more thread engagement means less tendency to loosen under cyclic load
- Finer torque adjustment — smaller thread pitch allows more precise clamping force control
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 speed of assembly matters more.
See our Grade 8 UNC Assortment for the coarse-thread companion kit.
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 kits
- Pair it with the UNC kit for a complete Grade 8 imperial fastener inventory
- B2B accounts: Custom pricing and a dedicated rep for automotive shops, aerospace facilities, and precision manufacturers — contact us to get started
Original: $209.95
-65%$209.95
$73.48
Description
Fine-thread Grade 8 bolts hold tighter under vibration — which is why they're the standard for automotive, aerospace, and precision mechanical applications. This 1,025-piece UNF assortment covers 1/4" through 1/2" fine-thread sizes in a labeled 24-hole metal bin.
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
- 24-hole metal bin — pre-labeled and ready to stock
- 1,025 pieces total
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 |
| Approx. weight | 25 lbs |
| SKU | ASSTHHCS24F8 |
Best For
- Automotive repair — suspension, steering, drivetrain, and engine work where vibration resistance is critical
- Aircraft and aerospace maintenance — fine thread is standard in most aviation fastener applications
- Precision manufacturing — assembly environments requiring fine torque control and tighter clamping force
- Shops building a complete Grade 8 inventory — coarse thread for structural work, fine thread for automotive and precision applications
Fine Thread vs. Coarse Thread
UNF (fine thread) has more threads per inch than UNC (coarse thread), giving it two advantages in the right applications:
- Better vibration resistance — more thread engagement means less tendency to loosen under cyclic load
- Finer torque adjustment — smaller thread pitch allows more precise clamping force control
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 speed of assembly matters more.
See our Grade 8 UNC Assortment for the coarse-thread companion kit.
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 kits
- Pair it with the UNC kit for a complete Grade 8 imperial fastener inventory
- B2B accounts: Custom pricing and a dedicated rep for automotive shops, aerospace facilities, and precision manufacturers — contact us to get started
