---
product_id: 6584246
title: "SDI-5421 Snap-off Utility Knife with 12 Set of Sk2+cr Blades, 18mm Heavy Duty Cutter"
brand: "sdi corp"
price: "4.80 OMR"
currency: OMR
in_stock: true
reviews_count: 5
url: https://www.desertcart.com.om/products/6584246-sdi-5421-snap-off-utility-knife-with-12-set-sk2
store_origin: OM
region: Oman
---

# 44LB pressure lock 18mm heavy-duty blade 12 snap-off SK2+CR blades SDI-5421 Snap-off Utility Knife with 12 Set of Sk2+cr Blades, 18mm Heavy Duty Cutter

**Brand:** sdi corp
**Price:** 4.80 OMR
**Availability:** ✅ In Stock

## Summary

> 🔪 Cut sharp, lock tight, work smart — the utility knife that means business.

## Quick Answers

- **What is this?** SDI-5421 Snap-off Utility Knife with 12 Set of Sk2+cr Blades, 18mm Heavy Duty Cutter by sdi corp
- **How much does it cost?** 4.80 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/6584246-sdi-5421-snap-off-utility-knife-with-12-set-sk2)

## Best For

- sdi corp enthusiasts

## Why This Product

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

## Key Features

- • **Ergonomic Grip Design:** Grooved plastic body ensures a comfortable, slip-free hold during extended use.
- • **Versatile Cutting Power:** Cuts through cardboard, plastics, foam board, balsa wood, and more—your all-in-one heavy-duty cutter.
- • **Unbreakable Metal Casing:** Solid metal blade housing built to last through the toughest cuts.
- • **Precision Locking Mechanism:** Screw blade-locking system withstands up to 44 pounds of pressure for ultimate safety and control.
- • **Effortless Blade Replacement:** Tool-free snap-off blades made from premium Japanese SK2+CR steel for razor-sharp edges and long-lasting performance.

## Overview

The SDI-5421 Snap-off Utility Knife features an 18mm heavy-duty blade made from premium Japanese SK2+CR steel, housed in a durable metal casing with a screw locking mechanism that withstands up to 44 pounds of pressure. Designed for professional-grade cutting tasks, it offers an ergonomic grooved grip and tool-free blade changes with 12 included snap-off blades, making it the ultimate multi-functional cutter for demanding projects.

## Description

SDI-5421 Snap-off Utility Knife with 12 Set of Sk2+cr Blades, 18mm Heavy Duty Cutter

## Features

- 18mm SDI-5421 heavy duty cutter, utility-knives, with solid metal blade casing and finger lock feels firm, strong and unbreakable in use. Suitable for cutting shim, wire form, heavy weight board, mount board, balsa wood and other heavy duty cutting.
- Includes screw blade-locking mechanism to secure blade while cutting. Grooved plastic body for grip to ensure comfortable use. The locking mechanism can withstand up to 44LB of pressure.
- Stainless steel blade channel that holds blade tight. Easy tool-free blade change with high quality snap-off blades. Heavy duty plastic grip with sturdy die cast slide section. Blade slides out and screw mechanism locks blade into position.
- Cuts cardboard, plastics, coroplast, foam board, gator board. Multi functional knife. Tight forward and reverse slide action. This is very well made and designed.
- Blade made from special Sk2+cr steel from Japan and designed for unparalleled sharpness and superior edge retention. Included with this cutter is 12 additional replacement 18mm snap-off blades.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Stainless Steel, Alloy Steel, Plastic |
| Brand | SDI Corp |
| Color | Red |
| Handle Material | Wood,Stainless Steel,Plastic,Metal,Steel |
| Blade Material | Metal, Stainless Steel |
| Style | Snap Blade Knife |
| Handle Type | Manual-Retractable |
| Manufacturer | SDI Corp |
| Part Number | 5421 |
| Item Weight | 6.4 ounces |
| Product Dimensions | 8 x 4 x 0.5 inches |
| Country of Origin | Taiwan |
| Item model number | SDI-5421 |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Special Features | Locking Blades |

## Product Details

- **Material:** Stainless Steel, Alloy Steel, Plastic
- **Brand:** SDI Corp
- **Color:** Red
- **Handle Material:** Wood,Stainless Steel,Plastic,Metal,Steel
- **Blade Material:** Metal, Stainless Steel
- **Style:** Snap Blade Knife
- **Handle Type:** Manual-Retractable
- **Manufacturer:** SDI Corp

## Images

![SDI-5421 Snap-off Utility Knife with 12 Set of Sk2+cr Blades, 18mm Heavy Duty Cutter - Image 1](https://m.media-amazon.com/images/I/41rlya3uYLL.jpg)
![SDI-5421 Snap-off Utility Knife with 12 Set of Sk2+cr Blades, 18mm Heavy Duty Cutter - Image 2](https://m.media-amazon.com/images/I/71k5GQLfI6L.jpg)
![SDI-5421 Snap-off Utility Knife with 12 Set of Sk2+cr Blades, 18mm Heavy Duty Cutter - Image 3](https://m.media-amazon.com/images/I/81WmdZfaqIL.jpg)
![SDI-5421 Snap-off Utility Knife with 12 Set of Sk2+cr Blades, 18mm Heavy Duty Cutter - Image 4](https://m.media-amazon.com/images/I/81a7gOQPihL.jpg)
![SDI-5421 Snap-off Utility Knife with 12 Set of Sk2+cr Blades, 18mm Heavy Duty Cutter - Image 5](https://m.media-amazon.com/images/I/31RzvBAVR7L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Well made cutter and plenty spare blades
*by S***. on May 22, 2013*

Well made tool; safe for your hands too - you can tighten the screw and the blade will not move (that happens a lot with other designs, when cutting hard cardboard etc.). Can't beat the price.

### ⭐⭐⭐ WORKS WELL BUT...
*by B***G on November 28, 2013*

The locking devise would probably be handy for heavier use but for quick, light use it's more of an inconvenience.

### ⭐⭐⭐⭐ I have this same knife... Almost the same as my old Olfa!
*by C***E on November 1, 2018*

I have this same knife. It was hanging around in my toolbox unused for quite awhile, while I was using my Olfa of the same design.When my Olfa FINALLY bit the dust, I was very sad and figured I'd have to spend the cash and buy a new Olfa to replace it. You see, it was the knob that finally cracked and broke. But it is the knob design that I liked about my old Olfa!)THEN I came across this red one that I had stashed away and started using it.It SEEMS, so far in the few months that I've been using it, to be the same quality as the Olfa.As Amazon flashed this knife before my eyes... in the magical (sneaky?) way that Amazon does (it reads minds!!!) I thought I would leave a review for it! :-)Original Olfa blades (which are a bit thicker than the knock-offs) fit this just fine, as you can see in my pic.Next time I need a new knife (when this one also, FINALLY dies) I know where to go!hmmm... maybe I should buy it now, just in case!??

---

## 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.com.om/products/6584246-sdi-5421-snap-off-utility-knife-with-12-set-sk2](https://www.desertcart.com.om/products/6584246-sdi-5421-snap-off-utility-knife-with-12-set-sk2)

---

*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-02-24*