---
product_id: 603226759
title: "Firestop Block CFS-BL"
brand: "hilti"
price: "₨59044"
currency: LKR
in_stock: true
reviews_count: 2
category: "Hilti"
url: https://www.desertcart.lk/products/603226759-firestop-block-cfs-bl
store_origin: LK
region: Sri Lanka
---

# Versatile for commercial & residential Ultimate fire resistance Precision fit for 5.25" grooves Firestop Block CFS-BL

**Brand:** hilti
**Price:** ₨59044
**Availability:** ✅ In Stock

## Summary

> 🔥 Seal the deal on safety with Hilti Firestop Block!

## Quick Answers

- **What is this?** Firestop Block CFS-BL by hilti
- **How much does it cost?** ₨59044 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/603226759-firestop-block-cfs-bl)

## Best For

- hilti enthusiasts

## Why This Product

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

## Key Features

- • **Firestop Mastery:** Blocks flames, smoke & toxic gases with moldable putty technology
- • **Dual-Use Durability:** Ideal for both commercial and residential fire-resistive walls
- • **Lightweight Strength:** Robust Grade 10.9 hardness at just 0.78 lbs for easy handling
- • **Fire Marshal Approved:** Certified to meet stringent fire safety standards for peace of mind
- • **Perfect Fit Precision:** Designed for 5.25-inch electrical box grooves ensuring seamless installation

## Overview

Hilti Firestop Block CFS-BL is a moldable firestop putty block designed to protect electrical boxes in fire-resistive walls by preventing flames, smoke, and toxic gases from passing through. Sized for 5.25-inch grooves, it suits both commercial and residential applications, offering certified fire marshal approval and durable Grade 10.9 hardness in a lightweight form.

## Description

These blocks can be used for commercial and residential applications. They are comprised of moldable firestop putty and are designed to help protect electrical outlet and switch boxes from the passage of flames, toxic gases, smoke and temperature.

Review: Not what I needed I didn't work for me it's - It didn't work for what we needed it not moldable. Probably more I me .I returned it and was very happy how fast they took care of my refund 5 stars to them for that
Review: Fire marshal approved - Just I was going looking for!

## Features

- Hilti
- Firestop Block
- Approximately 8" x 51/4"
- For firestopping electrical boxes in fire resistive walls.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01MT7UWCF |
| Brand Name | HILTI |
| Colour | Gray |
| Compatible Groove Diameter | 5.25 Inches |
| Customer Reviews | 3.7 out of 5 stars 7 Reviews |
| Exterior Finish | Gray coating or material |
| Exterior finish | Gray coating or material |
| Fastener Type | Firestop Bolt |
| Grade Rating | Ultimate |
| Head Type | Hex |
| Head style | Hex |
| Item Dimensions | 13.7 x 20 x 5.1 centimetres |
| Item Hardness | Grade 10.9 |
| Item Weight | 0.78 Pounds |
| Manufacturer | Hilti |
| Manufacturer Grade | Grade CFS |
| Manufacturer Part Number | CFS-BL |
| Manufacturer grade | Grade CFS |
| Material | Multiple |
| Material Type | Multiple |
| Model Number | CFS-BL |
| Number of Pieces | 1 |
| Screw Head Style | Hex |
| Thread Size | 1/4"-20 UNF |
| Thread Style | Right Hand |
| Thread Type | UNF |
| Thread size | 1/4"-20 UNF |

## Product Details

- **Exterior finish:** Gray coating or material
- **Head style:** Hex
- **Manufacturer grade:** Grade CFS
- **Material:** Multiple
- **Thread size:** 1/4"-20 UNF

## Images

![Firestop Block CFS-BL - Image 1](https://m.media-amazon.com/images/I/81pVFDz6OQL.jpg)

## Questions & Answers

**Q: Why does the product description say "comprised" where it should have said "composed?"**
A: amazon mistake they  describe the item

## Customer Reviews

### ⭐⭐⭐⭐ Not what I needed I didn't work for me it's
*by P***Y on 29 September 2022*

It didn't work for what we needed it not moldable. Probably more I me .I returned it and was very happy how fast they took care of my refund 5 stars to them for that

### ⭐⭐⭐⭐⭐ Fire marshal approved
*by M***. on 12 January 2020*

Just I was going looking for!

## Frequently Bought Together

- Hilti Firestop Block CFS-BL
- HIlti 2101531 FS-ONE MAX 10.1oz Tube (1 Tube) firestop fire Protection Systems

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-07-09*