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

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Description

🛠️ Tension with precision, grip with comfort — Klein Tools keeps your cables tight and your workflow tighter.

COMFORT DRIVEN DESIGN - Ergonomic handle grips reduce hand fatigue during extended use—work smarter, not harder.
COMPACT LIGHTWEIGHT - Weighing just 0.71 lbs, it’s easy to carry and perfect for on-the-go professionals.
VERSATILE COMPATIBILITY - Designed to handle ties rated between 120 and 250 pounds, ensuring strength where it counts.
DURABILITY YOU CAN TRUST - Crafted from high-quality nylon and backed by Klein’s 160+ years of professional-grade tool expertise.
PRECISION TENSION CONTROL - Delivers up to 65 lbs of reliable tension for secure, professional cable management.

The Klein Tools 86570 Nylon Tie Tensioning Tool is engineered for professionals needing precise tension control on cable ties rated 120 to 250 pounds. It supplies up to 65 pounds of tension with ergonomic grips for comfort, built from durable nylon, and backed by over 160 years of Klein’s trusted craftsmanship.

Specifications

ASIN	B004G3RO5G
Brand Name	KLEIN TOOLS
Color	Factory
Country of Publication	Taiwan
Customer Reviews	4.7 4.7 out of 5 stars (2,533)
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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B/.177

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered 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 Panama.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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