what is the min. thickness tool can handle ? should there be a space between the clamp bar and the inside tool face?

I've used this tool to tighten the smallest zip ties. I believe the answer to your second question is no. I prefer this tool to one I have that sets a spring tension.

Will this work on 1/8 inch diameter fuel connections on a boat?

I'm not really sure what you mean by 1/8" connections on a boat. This is a nylon bander. It will not work with metal bands if that's what you're referring to.

Will these work with large hvac pull ties?

Yes that is what I purchased them for and they worked great

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Klein Tools 86570 Tie Tensioning Tool, for Ties Rated at 120 to 250-Pound, Supplies up to 65-Pound of Tension, Handle Grips for Comfort

Product ID: 345879210

Details

Brand
KLEIN TOOLS
Colour
Factory
Material
Nylon
Maximum diameter
1.2
Style
Tensioning

💪65 lbs max tension

📏Fits ties up to 15/32 inch

🛠️Works with 120-250 lb rated ties

€ 94.89

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Description

🛠️ Tension like a pro — secure every tie with Klein precision!

COMFORT DRIVEN DESIGN - Ergonomic handle grips reduce hand fatigue during extended use, keeping you efficient and comfortable.
COMPACT LIGHTWEIGHT - Weighing just 322 grams, this tool is easy to carry and use on any job site without bulk.
VERSATILE COMPATIBILITY - Designed to handle cable ties rated between 120 and 250 pounds, perfect for heavy-duty applications.
TRUSTED LEGACY CRAFTSMANSHIP - Backed by Klein Tools’ 160+ years of American-made quality and durability you can rely on.
POWERFUL PRECISION TENSIONING - Delivers up to 65 lbs of controlled tension for secure, professional results every time.

The Klein Tools 86570 Tie Tensioning Tool is a durable, nylon-built manual tensioner designed for cable ties rated 120 to 250 pounds. It supplies up to 65 pounds of tension with ergonomic grips for comfort, making it ideal for professional-grade cable management and heavy-duty securing tasks. Trusted for over 160 years, Klein Tools delivers precision and reliability in a compact, lightweight design.

Specifications

ASIN	B004G3RO5G
Best Sellers Rank	#23,424 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #17 in Tie-Down Ratcheting
Brand Name	KLEIN TOOLS
Color	Factory
Country of Publication	Taiwan
Customer Reviews	4.7 4.7 out of 5 stars (2,537)
Global Trade Identification Number	00092644865701
Included Components	Tools
Item Type Name	Nylon Tie Tensioning Tool
Item Weight	322 g
Manufacturer	KLEIN TOOLS
Manufacturer Part Number	86570
Material Type	Nylon
Maximum Diameter	1.2 Centimeters
Model Number	86570
Number of Pieces	1
Product Style	Tensioning tool
Tensile Strength	65 Pounds
UPC	092644865701
Unit Count	1 Count

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€ 94.89

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered 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 Cyprus.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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