---
product_id: 27070033
title: "SPAX 1/4\" x 3-1/2\" Exterior Washer Head Structural Wood Lag Screws Powerlags Torx T-Star (50 EA) Bit Included Heavy Duty Rust Resistant"
brand: "spax"
price: "R1313"
currency: ZAR
in_stock: true
reviews_count: 8
category: "Spax"
url: https://www.desertcart.co.za/products/27070033-spax-1-4-x-3-1-2-exterior-washer-head
store_origin: ZA
region: South Africa
---

# Grade 5 heat-treated strength 1/4" x 3-1/2" size Rust resistant for outdoor use SPAX 1/4" x 3-1/2" Exterior Washer Head Structural Wood Lag Screws Powerlags Torx T-Star (50 EA) Bit Included Heavy Duty Rust Resistant

**Brand:** spax
**Price:** R1313
**Availability:** ✅ In Stock

## Summary

> 🔧 Build Better, Build Boldly!

## Quick Answers

- **What is this?** SPAX 1/4" x 3-1/2" Exterior Washer Head Structural Wood Lag Screws Powerlags Torx T-Star (50 EA) Bit Included Heavy Duty Rust Resistant by spax
- **How much does it cost?** R1313 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/27070033-spax-1-4-x-3-1-2-exterior-washer-head)

## Best For

- spax enthusiasts

## Why This Product

- Trusted spax brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Unmatched Strength:** Heat-treated for Grade 5 durability, ensuring long-lasting performance under pressure.
- • **Sleek & Modern Design:** Transform your projects with a contemporary washer head that enhances aesthetics.
- • **Universal Compatibility:** T-Star drive works with all standard bits for effortless installation.
- • **Code Compliant Confidence:** ICC-ES recognized for structural applications, giving you peace of mind in every build.
- • **Innovative Thread Technology:** Experience faster installation and reduced wood splitting with our patented threads.

## Overview

The SPAX 1/4" x 3-1/2" Exterior Washer Head Structural Wood Lag Screws are engineered for superior performance and durability. Featuring a sleek low-profile design, these screws offer excellent clamping ability with reduced driving torque. Heat-treated for Grade 5 strength, they are rust-resistant and ICC-ES recognized for structural applications, making them ideal for both treated lumber and exterior projects. Each pack includes a compatible bit for your convenience.

## Description

The SPAX Factor - For the craftsman that concentrates on the details, We Work for You. For the Pro that puts quality first, we help you create stronger connections, enhance performance and improve results when your reputation is on the line. Say goodbye to your father’s traditional lag. SPAX PowerLag Screws offer superior installation performance and durability over traditional lag screws and carriage bolts for structural wood construction. These T-star washer head screws are made of carbon steel and coated for long term durability to ensure your project endures. U.S made SPAX is your trusted partner for your fastening needs. Do it Once, Do it Right with SPAX. The item includes a bit in the pail.

Review: Love spax screws - Love spax screws, very durable, easy to install with a drill and saves time drilling for carriage bolts, washers and nuts. Same strength. I use these when putting A frames together for outdoor swings I build.
Review: good product - Well made. Perfect for my purpose.

## Features

- T-Star Screw: The trend setting low profile built-on washer head design offers a contemporary & sleek finished installation. Excellent draw down strength without the need for a separate washer delivers superior clamping ability and 40% less driving torque
- Heat Treated Grade 5 Durability: Stay Stronger for Longer! Subjecting the PowerLag screw to heat treating gives greater strength and reduces breakage. Tested under the toughest scenarios to give you confidence in every connection.
- Check out our Threads: Our patented thread technology allows the washer head screw to be driven faster; is easier to install; and reduces splitting in wood. Let SPAX take some of the hassle out of your next project. The item includes a bit in the pail.
- ICC-ES building code recognized for use in structural wood to wood applications. ICC-ES Report ESR-1783. Manufactured to imperial size standards leading pull-through and withdrawal values. Recommended for use in treated lumber and exterior applications
- T-star Screw: T-Star drive accepts and is compatible with all industry standard bits. Our 6-Lobe design corrosion resistant screw provides superior bit engagement. Better bit engagement means quicker installation with less effort.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B018JQFDJE |
| Best Sellers Rank | #12,823 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #504 in Wood Screws |
| Brand | SPAX |
| Color | Black |
| Compatible Groove Diameter | 0.25 Inches |
| Customer Reviews | 4.8 out of 5 stars 607 Reviews |
| Drive System | Torx |
| Exterior Finish | Black Oxide |
| Fastener Size | 3-1/2" |
| Fastener Type | Wood Screws |
| Finish Types | Black Oxide |
| Global Trade Identification Number | 00712216019195 |
| Grade Rating | grade_ 5 |
| Head Style | Modified Truss |
| Head Type | Truss |
| Included Components | Building Materials & Ladders; Decking & Fencing; lag-screws |
| Item Diameter | 0.25 Inches |
| Item Dimensions | 3.5 x 0.25 x 0.25 inches |
| Item Type Name | lag-screws |
| Item Weight | 1.75 Pounds |
| Item dimensions L x W x H | 3.5 x 0.25 x 0.25 inches |
| Manufacturer | Altenloh, Brink & Co |
| Material | Carbon Steel |
| Material Type | Carbon Steel |
| Maximum Shear Strength | High (structural wood applications, grade 5) |
| Metal Type | Alloy Steel |
| Model | 4581820000000 |
| Number Of Items | 50 |
| Number of Pieces | 50 |
| Part Number | CECOMINOD068517 |
| Point Style | Self-Tapping |
| Screw Head Style | Modified Truss |
| Screw Point Style | Self-Tapping |
| Set Name | 50-Piece Set |
| Set Screw Thread Type | UNC |
| Size Name | 1/4 X 3-1/2" |
| Thread Class | 3A |
| Thread Coverage | Fully Threaded |
| Thread Size | 1/4 x 3" |
| Thread Style | Right Hand |
| Thread Type | Un |
| UPC | 712216019195 |
| Unit Count | 1.0 Count |

## Images

![SPAX 1/4" x 3-1/2" Exterior Washer Head Structural Wood Lag Screws Powerlags Torx T-Star (50 EA) Bit Included Heavy Duty Rust Resistant - Image 1](https://m.media-amazon.com/images/I/41Mhc+j2cYL.jpg)
![SPAX 1/4" x 3-1/2" Exterior Washer Head Structural Wood Lag Screws Powerlags Torx T-Star (50 EA) Bit Included Heavy Duty Rust Resistant - Image 2](https://m.media-amazon.com/images/I/61C+hRkqVzL.jpg)
![SPAX 1/4" x 3-1/2" Exterior Washer Head Structural Wood Lag Screws Powerlags Torx T-Star (50 EA) Bit Included Heavy Duty Rust Resistant - Image 3](https://m.media-amazon.com/images/I/61Wpyk4vf4L.jpg)
![SPAX 1/4" x 3-1/2" Exterior Washer Head Structural Wood Lag Screws Powerlags Torx T-Star (50 EA) Bit Included Heavy Duty Rust Resistant - Image 4](https://m.media-amazon.com/images/I/81bP437bGWL.jpg)
![SPAX 1/4" x 3-1/2" Exterior Washer Head Structural Wood Lag Screws Powerlags Torx T-Star (50 EA) Bit Included Heavy Duty Rust Resistant - Image 5](https://m.media-amazon.com/images/I/71Yyr6Q1rOL.jpg)

## Available Options

This product comes in different **Size, Number Of Items** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Love spax screws
*by R***S on April 15, 2026*

Love spax screws, very durable, easy to install with a drill and saves time drilling for carriage bolts, washers and nuts. Same strength. I use these when putting A frames together for outdoor swings I build.

### ⭐⭐⭐⭐⭐ good product
*by C***B on April 14, 2026*

Well made. Perfect for my purpose.

### ⭐⭐⭐⭐⭐ Seem to be well made. Haven't yet used them.
*by S***N on April 17, 2026*

Thick. Looking forward to using this type head which seems to be reviewed well by different sites as well.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.co.za/products/27070033-spax-1-4-x-3-1-2-exterior-washer-head](https://www.desertcart.co.za/products/27070033-spax-1-4-x-3-1-2-exterior-washer-head)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-05-12*