What's the secret to removing the old blade and inserting a new one? Does it slide in and out from the back end?

I've never had to remove the old blade and replace it. I just use pliers to snap off the dulled little piece which reveals a new, sharp edge. Once the whole blade is used up, I usually just toss it. I don't know if it's replaceable or not.

What do you do when it jams after you replaced the blade? This didn’t happen the first time I replaced the blade

Just take it apart and clean it with soap and water and a small brush (like a toothbrush). This is a precision made tool, and by and far the best in it's class I might add. The specs are tight, so if a little debris (such as dirt or pocket lint), gets into the sliding track grooves, it can block the blade from extending. Remember to air dry the parts separately before re-assembling. With proper cleaning and care, this high quality, heavy duty tool will dutifully serve you for a lifetime. I keep this very model on me at all times (L-500GRP).

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NT Cutter Heavy-Duty Aluminum Die-Cast Anti-Slip Contoured Grip Screw-Lock Utility Knife (L-550GP)

Product ID: 6600234

Details

Blade Material
Aluminum
Brand
NT Cutter
Color
Stainless
Handle Material
Stainless
Item Length
1.8
Item Weight
3.84 ounces

🔒Secure screw-lock blade system

🔪18mm heavy-duty snap-off blade

🛠️Aluminum die-cast anti-slip contoured grip

¥2808

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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Description

🔪 Cut above the rest — precision, power, and eco-conscious grip in one sleek tool!

SAFETY FIRST LOCKING - Robust screw-lock system keeps the blade firmly in place for worry-free, precise cuts.
ERGONOMIC GRIP MASTERY - Aluminum die-cast contoured handle with anti-slip coating ensures maximum control—even with gloves on.
PRECISION CUTTING POWER - 18mm carbon tool steel blade engineered for ultimate sharpness and edge retention.
SUSTAINABLE CRAFTSMANSHIP - Made from 100% post-consumer recycled materials with water-resistant electrical-acrylic metal coating.
VERSATILE INDUSTRIAL STRENGTH - Perfect for cardboard, leather, linoleum, carpet, foam board, and more—trusted by pros worldwide.

The NT Cutter L-550GP is a premium Japanese-made utility knife featuring an 18mm heavy-duty snap-off carbon steel blade, an ergonomic aluminum die-cast anti-slip grip crafted from recycled materials, and a secure screw-lock system. Designed for professionals demanding precision, durability, and safety across diverse cutting tasks, this tool combines sustainable materials with exceptional build quality for unmatched performance in industrial and DIY applications.

Specifications

ASIN	B009F6C9F4
Best Sellers Rank	#31,180 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #155 in Utility Knives
Blade Material	Aluminum
Brand	NT Cutter
Brand Name	NT Cutter
Color	Stainless Steel
Customer Reviews	4.5 out of 5 stars 113 Reviews
Global Trade Identification Number	00030203900357
Handle Material	Stainless, Stainless Steel , Metal, Steel, Rubber
Handle Type	Manual-Retractable
Item Length	1.8 Centimeters
Item Weight	3.84 ounces
Manufacturer	NT Incorporated
Manufacturer Part Number	L-550GP
Material	Stainless Steel
Material Type	Stainless Steel
Model Number	L-550GP
Product Style	Aluminum Die-Cast Anti-Slip Contoured Grip with Screw-Lock
UPC	030203900357
Unit Count	1.0 Count

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¥2808

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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