16d 3-1/2" Bright Duplex Nails – Double-Head Construction Fasteners – Smooth Shank Steel for Concrete Formwork & Scaffolding – 50 lb. Bulk Box (~1,400 Nails)

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SKU:
PSPNAB312D
MPN:
NAB312D
Availability:
Ready to ship
Weight:
50.0000 LBS
$79.00
  • ✔️ Double-Head Architecture: Pulls out cleanly without destroying structural formwork timber during stripping. ✔️ 50 Lb High-Volume Box: Offers general framing contractors an economical bulk supply for large concrete pours.
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Description

16d 3-1/2" Bright Duplex Nails – Double-Head Construction Fasteners 

Ultra-Fast Form Stripping. Maximum Structural Hold. Reusable Lumber Performance with Zero Wood Damage.

The 16d 3-1/2" Bright Duplex Double-Head Construction Nails (50 lb. Box) bring high-efficiency stripping, reliable temporary holding power, and major project cost-savings directly to your concrete formwork and temporary scaffolding structures. Purpose-built to eliminate the split lumber, bent crowbars, and exhausting teardown labor caused by driving standard framing nails flush, these pro-grade double-headed nails ensure lightning-fast dismantling. It supplies commercial concrete contractors, foundation crews, and framing teams with a heavy-duty bulk supply optimized to secure wooden concrete forms, temporary bracing, and jobsite scaffolding reliably.

Industrial-grade pullout resistance and effortless structural extraction serve as the core design of these elite Duplex Fasteners. Engineered with a dual-head structure, the nail drives flush to the lower head to deliver a rock-solid physical grip, leaving the primary upper flange exposed by 1/2 inch for immediate claw hammer or prybar access. Its heavy-duty 8-gauge thick smooth shank slides into timber frames cleanly without causing structural splitting, yet holds firm against fluid concrete pour pressures. Formed with a bright, untreated clean steel finish, these bulk nails provide an exceptional, cost-effective fastening element optimized for high-volume indoor or temporary outdoor assemblies.

Why These 16d 3-1/2" Duplex Nails Command the Jobsite:

  • Dual-Head Pulling Efficiency: Lower flange acts as a positive depth stop, while the exposed upper flange lets prybars pluck the nail in seconds.
  • 8-Gauge Structural Carbon Steel: Thick 0.162-inch shank diameter delivers exceptional shear strength to withstand intense hydrostatic concrete forces.
  • Premium Diamond Point Tips: Sharp, precision-formed points minimize wood grain splitting and enable fast, straight hand-driving.
  • High-Value 50 lb. Contractor Box: Packed in a rugged, jobsite-ready bulk carton containing roughly 1,400 nails to keep commercial crews supplied.
  • ASTM F1667 Compliance: Uniformly manufactured to stringent industry specifications, ensuring identical dimensions and structural durability across the entire box.

Specifications

Fastener Dimensional Metric Industrial Specification Details
Penny Size Designation 16d (Standard 16-Penny Temporary Multi-Head Classification)
Total Fastener Length 3-1/2 Inches (88.9 mm Total Top Head to Tip Boundary)
Drivable Depth Capacity 3 Inches (76.2 mm Penetration Distance to Lower Depth Stop)
Shank Structural Gauge 8 Gauge (Heavy-Duty Smooth Wire Structural Profiling)
Shank Outer Diameter 0.162 Inches (4.11 mm Thick Solid Steel Frame)
Core Material Base High-Tension Uncoated Carbon Steel Matrix
Exterior Protective Finish Bright Basic Uncoated Steel (Optimized for Non-Corrosive Tasks)
Head Structural Profile Duplex / Double-Head Style (Built-In Flanged Depth Stop)
Primary Nail Point Type Precision Diamond Point (Self-Centering Easy Start Nose)
Average Piece Count Approx. 28 Nails per Pound (~1,400 Total Nails per 50 lb. Carton)
Primary Project Material Fit Wood Concrete Forms, Lumber Bracing, Scaffolding, Cleats
Compliance Regulations Met Conforms fully to ASTM F1667 Industrial Fastener Dimensions

Frequently Asked Questions

+ What exactly is a duplex nail and how does the double-head system operate?
A duplex nail (or double-headed nail) is designed specifically for temporary timber assemblies. When driving the nail, it sinks into the wood until the lower flange sits completely flush with the lumber surface, pinning your framing tightly together. The second, upper head remains exposed by about a half-inch. When it\'s time to tear down, you can slip a hammer claw or cat\'s paw directly under the exposed head to pop the nail out effortlessly without splitting your expensive dimensional wood.
+ Can these bright-finish steel nails be used for permanent outdoor framing or pressure-treated wood?
No, they are strictly for temporary framing and indoor/sheltered use. These nails feature a "bright" finish, which means they are raw, uncoated steel. They do not have a protective zinc coating to fight off outdoor rust. Additionally, the corrosive chemicals inside modern pressure-treated lumber will rapidly degrade raw steel. For permanent exterior framing, you should always utilize Hot-Dipped Galvanized (HDG) or Stainless Steel nails.
+ What is the difference between the 3-1/2" total length and the 3" driving depth?
The total physical length of the nail from the tip to the uppermost head is 3-1/2 inches. However, because the nail is meant to be driven only up to the lower flanged head, your effective penetration or driving depth into the wood is exactly 3 inches. The remaining 1/2 inch stays entirely above the wood surface to give stripping crews a clean pulling point.
+ Approximately how many individual duplex nails are contained inside this 50 lb. box?
Because bulk industrial fasteners are packaged by weight rather than exact piece count, numbers will vary slightly per carton. However, standard 16d (8-gauge) duplex nails average roughly 28 pieces per pound. This means a full 50 lb. bulk contractor box provides approximately 1,400 nails, giving commercial concrete crews plenty of fasteners to handle large-scale layout pours.
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Product Specifications

category_bullets:
• 3-1/2" Duplex Nails Core: Double-headed smooth steel duplex nails secure temporary concrete formwork, scaffolding, and wood bracing structures. • 50 Lb Bulk Box. • Bright Finish.
selling_points:
✔️ Double-Head Architecture: Pulls out cleanly without destroying structural formwork timber during stripping. ✔️ 50 Lb High-Volume Box: Offers general framing contractors an economical bulk supply for large concrete pours.
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