---
product_id: 22953034
title: "IRWIN Tools MARATHON Vinyl Siding Circular Saw Blade, 7 1/4-inch, 120T (21830ZR)"
brand: "irwin"
price: "฿1613"
currency: THB
in_stock: true
reviews_count: 8
url: https://www.desertcart.co.th/products/22953034-irwin-tools-marathon-vinyl-siding-circular-saw-blade-7-1
store_origin: TH
region: Thailand
---

# Silicone coat 120T precision Construction-grade carbide IRWIN Tools MARATHON Vinyl Siding Circular Saw Blade, 7 1/4-inch, 120T (21830ZR)

**Brand:** irwin
**Price:** ฿1613
**Availability:** ✅ In Stock

## Summary

> 🔧 Cut Like a Pro with IRWIN's Precision Blade!

## Quick Answers

- **What is this?** IRWIN Tools MARATHON Vinyl Siding Circular Saw Blade, 7 1/4-inch, 120T (21830ZR) by irwin
- **How much does it cost?** ฿1613 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/22953034-irwin-tools-marathon-vinyl-siding-circular-saw-blade-7-1)

## Best For

- irwin enthusiasts

## Why This Product

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

## Key Features

- • **Durability Redefined:** Enjoy longer blade life with construction-grade carbide teeth designed for heavy-duty use.
- • **Speed Meets Precision:** Achieve faster cuts with a unique tooth design that features thinner every other tooth.
- • **Versatile Applications:** Perfectly engineered for cutting gutters, vinyl siding, and PVC piping with a 60-degree tooth design.
- • **Cutting Edge Performance:** Experience effortless slicing with a silicone coat that minimizes pitch and resin buildup.
- • **Vibration Reduction Technology:** Innovative heat vent and expansion slot design for straighter cuts and reduced vibration.

## Overview

The IRWINTools MARATHON Vinyl Siding Circular Saw Blade is a 7 1/4-inch blade featuring 120 teeth, designed for optimal cutting performance in vinyl siding, gutters, and PVC piping. Its silicone coating reduces pitch buildup, while construction-grade carbide teeth ensure durability. The innovative design minimizes vibration, providing straighter cuts and longer blade life.

## Description

IRWIN Tools MARATHON Vinyl Siding Circular Saw Blade, 7 1/4-inch, 120T (21830ZR)

## Features

- Silicone coat allows the blade to slice easier through material reducing pitch and resin buildup when cutting pressure-treated lumber.
- Construction-grade carbide teeth deliver longer blade life. Every other tooth is thinner for faster cuts.
- The innovative heat vent/expansion slot design reduces vibration for longer life and straighter cuts. Plate is fully hardened to run truer, longer.
- 120 tooth count with optimized, symmetric 60-degree tooth design is ideal for cuts to gutters, vinyl siding and PVC piping.

## Product Details

- **Material:** Blend
- **Brand:** IRWIN
- **Product Dimensions:** 7.3"L x 7.3"W
- **Color:** Multi
- **Number of Teeth:** 120
- **Style:** Marathon
- **Item Weight:** 8 Ounces
- **Compatible Material:** Vinyl, Aluminum, Pvc
- **UPC:** 024721218308
- **Global Trade Identification Number:** 00024721218308

## Images

![IRWIN Tools MARATHON Vinyl Siding Circular Saw Blade, 7 1/4-inch, 120T (21830ZR) - Image 1](https://m.media-amazon.com/images/I/91wCV8Hf4VL.jpg)
![IRWIN Tools MARATHON Vinyl Siding Circular Saw Blade, 7 1/4-inch, 120T (21830ZR) - Image 2](https://m.media-amazon.com/images/I/41PRjgQv90L.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: Can I use this on a table saw?**
A: Thank you for choosing Irwin Tools. Our goal is to provide our customers with the highest quality and service. Yes the IRWIN Tools Classic Series Steel Table / Miter Circular Saw Blade, 10-Inch 180T (11870) will work on either a table or Miter saw.

**Q: Will this work to cut vinyl siding?**
A: This blade is intended to cut Plywood

**Q: So the classic 180 tooth blade, would it be good for a chop saw cutting pine boards for trim?**
A: That's what I used it for. Just remember it's a $12 blade not a $50 one.

**Q: I have 10" Dewalt compound miter saw. Will this blade work on my saw?**
A: I purchased the 7" for a skil saw but i don't see why not  if you can get an rpm rating that meets or exceeds that of your saw, has the correct arbor size, and is the same or slightly less diameter (say maybe a 12" or a 10" blade for a 14" miter saw). The smaller may have a higher rpm rating for use on the faster wood cutting saws. Safety glasses are a must. Your wood cutting saws' guards are not as protective as a metal cutoff.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great
*by C***G on June 17, 2025*

A must have for clean cutting vinyl siding and pvc trim.

### ⭐⭐⭐⭐⭐ Saw blade
*by D***E on May 8, 2025*

Good saw blade. I used it to cut plexiglass. Worked good

### ⭐⭐⭐⭐⭐ Makes cutting durock easier and cleaner
*by J***T on November 6, 2019*

I used this blade with a corded SKIL 5280 7-1/4-Inch Circular Saw to cut backer board for a shower reno in my house. I cut mostly half inch and a few sheets of quarter inch Durock, total of about 12 sheets, but including a bunch of small pieces for a shower niche and a bench.I was on the fence about buying this because it's expensive (almost as much as the saw!) and because I had previously been able to do an adequate (but slow and painful) job cutting Durock using a razor knife (and a whole bunch of blades) on another job around the house. But I was looking for something that was (a) faster, (b) cut a cleaner edge and (c) didn't wear me out so much to use - so I took the leap.I'd say this blade fit all 3 counts.(a) It literally chews through Durock. Occasionally it'd hit a hard spot and would take a second to catch, but by and large the Durock was toast. It was really fast, it probably cut through a full 5' in maybe 10-15 seconds. This is several times faster than I can go with a razor knife (scoring, then cracking, then cutting again ...) - especially as those razor knife blades get dulled up after seems like just a couple cuts.(b) The edges were really clean. I clamped a guide board along the Durock to keep the saw straight, and it had absolutely no problem keeping straight. No waving edges to have to go back later and clean up in place. If you were really in a hurry, you could probably use it freehand, since it didn't struggle at all cutting the material. Overall those really clean edges made fitting them together much easier and greatly reduced the amount of time I had to spend scraping little protuberances to make all the sheets fit together.(c) I'm 39 - which I consider not real old, but also not real young, and anything I can do at this point to save my arm and shoulder some stress is welcome. This thing just took a lot of the effort out of the job. Hand cutting, especially with a dulled up razor, is something I'm happy to minimize. It just made it much less taxing of a job.The one blade lasted the entire job and I couldn't tell any difference in cutting from beginning to end. I'm assuming I'll be able to use it on my next project.There were a couple downsides:- It did make a lot of dust and blew bits of board off at high speed, and it was loud as all get-out. As others have said - wearing a mask, goggles and ear protection is a must. I did all the cutting outside the garage, I'm not sure I'd use it indoors unless it was really well ventilated.- It's expensiveOverall, I would definitely buy again despite my angst at the price point.

## Frequently Bought Together

- IRWIN Tools MARATHON Vinyl Siding Circular Saw Blade, 7 1/4-inch, 120T (21830ZR)
- TonGass (1-Pack, 7 Inches) Vinyl Siding Removal Tool with Extra Long Handle, Steel Blade Vinyl Installation and Removal Tool, The Ultimate Vinyl Siding Zip Tool, Avoid Damaging Vinyl Siding Tool
- Malco SL5 9 in. Snap Lock Punch Silver metallic

---

## 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.th/products/22953034-irwin-tools-marathon-vinyl-siding-circular-saw-blade-7-1](https://www.desertcart.co.th/products/22953034-irwin-tools-marathon-vinyl-siding-circular-saw-blade-7-1)

---

*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-03-02*