1/4-20 x 1 Flat Head Floorboard Screws, Type F (Six-Lobe), Black Phosphate vs 5/16-18 x 3 1/2" self-tapping trailer deck screws, flat head, Type F, T-40 star drive
Overall winner: 5/16-18 x 3 1/2" self-tapping trailer deck screws, flat head, Type F, T-40 star drive
Key Differences
Pick A (5/16-18 x 3.5" self-tapping trailer deck screws) if you want a lower listed price tier and hardened-steel, rust-resistant fastener for heavy trailer/deck use. Pick B (1/4-20 x 1 flat head floorboard screws) if you need a flush countersunk head and six-lobe drive for finish floorboard or wood-floor fastening where a low-profile head and oil finish matter
1/4-20 x 1 Flat Head Floorboard Screws, Type F (Six-Lobe), Black Phosphate
Floorboard screws for installing wood floors into truck trailers. Six-lobe flat heads provide a flush countersunk surface. Oil finish offers rust inhibition and lubrication; self tapping thread cutting for secure fastening
Pros
- six-lobe recess for drive stability
- flush countersunk head for smooth surface
- oil finish acts as rust inhibitor and lubricant
- self-tapping thread cutting for installation ease
Cons
- mixed signals on self-drilling capability
- customer notes on drill accuracy variability
5/16-18 x 3 1/2" self-tapping trailer deck screws, flat head, Type F, T-40 star drive
Self-tapping screws designed for wood and metal deck installations. Hardened steel with black phosphate and oil coating for corrosion resistance; Type F point for efficient thread cutting. Customer insight notes easy installation and durable performance, with positive feedback on quality and value
Pros
- self-tapping with Type F point
- works with wood and metal
- hardened steel with rust resistance
- ease of installation
Cons
- mixed confirmation on self-drilling capability
Head-to-Head
| Criteria | Winner |
|---|---|
| Price | Newport Fasteners |
| Durability | Newport Fasteners |
| Versatility | Newport Fasteners |
| User Reviews | Tie |