Therwen 21 Degree Framing Nails 3-1/2 in 1000 Pack - Durable

In this review the Therwen 21 degree framing nails are evaluated for carpenters, remodelers and DIYers who need a reliable collated nail for pressure treated lumber and exterior framing. The single biggest reason to buy these nails is their combination of hot-dipped galvanization and ring shank design, which delivers improved corrosion resistance and holding power for structural work. For anyone running a compatible 21 degree plastic strip nailer and wanting a full 1000-count supply in a common size, these nails present a practical, cost-effective option.

Key Features

• Quantity and size: A 1000-count pack of nails at about 3-1/2 in long and 0.131 in diameter provides a consistent supply for medium to large framing jobs without frequent reloading.
• Galvanized finish: The hot-dipped galvanized coating increases corrosion resistance for outdoor and pressure treated lumber applications, extending service life.
• Ring shank design: The 21 degree ring shank improves withdrawal resistance and joint stability compared with smooth-shank alternatives, helping structural integrity.
• Color coding: The bright orange, red and silver collated strips make identification and loading easier while the red undercoat adds a measure of extra protection against moisture.
• Compatibility: The plastic strip collated format is designed to work with most 21 degree framing nail guns, saving time and keeping work organized.
• Material quality: Made from ordinary carbon structural steel, these nails are intended to offer strength and consistent dimensions for repeatable performance.

Who It's For

The nails are best for professional framers, contractors, and serious DIYers who regularly use a 21 degree plastic strip framing nailer and need a durable, corrosion-resistant fastener for decks, exterior framing and pressure treated lumber. The 3-1/2 in length and ring shank make them suited to joist hangers and heavy framing connections where withdrawal resistance is important.

Those who should look elsewhere include users with nailers that accept different collation angles or lengths, or anyone requiring stainless steel fasteners for extreme coastal exposure; these are hot-dipped galvanized carbon steel, not stainless.

Pros & Cons

Pros

• Hot-dipped galvanization provides solid corrosion resistance for outdoor use and pressure treated lumber.
• Ring shank profile improves holding power and reduces loosening over time in structural joints.
• A full 1000-count pack and consistent dimensions reduce interruptions on the job and improve speed.
• Colorful collated strips simplify identification and loading in a busy workshop.

Cons

• Not stainless steel, so for extreme saltwater or corrosive environments a different alloy may be preferable.
• Requires a compatible 21 degree plastic strip nailer, so users with other collation systems will need to verify fit.

Specifications

Our Verdict

The Therwen 21 degree 3-1/2 in framing nails are a solid choice for framers and contractors who need a large supply of durable, well coated nails for exterior and treated lumber work. Their ring shank and hot-dipped galvanization deliver reliable holding power and corrosion resistance at a reasonable value, provided a compatible 21 degree plastic strip nailer is used.

Frequently Asked Questions

Are these nails suitable for pressure treated lumber?
Yes, the hot-dipped galvanized finish and red undercoat provide corrosion resistance suitable for pressure treated lumber in most standard exterior uses.

Will these fit my framing nailer?
They are collated for a 21 degree plastic strip system, so confirm your nailer accepts 21 degree plastic collation before purchasing.

Are these stainless steel?
No, they are carbon structural steel with a hot-dipped galvanized coating, not stainless; for extreme coastal exposure consider stainless fasteners.