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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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 lbs rated ties

B/.154

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Tighten with confidence, work with pride.

COMFORT GRIP HANDLES - Ergonomically designed grips reduce hand fatigue during extended use, keeping you efficient on the job.
COMPACT LIGHTWEIGHT - Weighing just 0.71 lbs, this tool is easy to maneuver without sacrificing durability.
VERSATILE COMPATIBILITY - Designed to handle ties rated between 120 and 250 pounds, covering a broad range of heavy-duty applications.
PRECISION TENSION CONTROL - Delivers up to 65 lbs of reliable tension for secure, professional tie-downs.
TRUSTED HERITAGE CRAFTSMANSHIP - Backed by over 160 years of Klein Tools’ legacy, ensuring unmatched quality and durability.

The Klein Tools 86570 Tie Tensioning Tool is a professional-grade nylon tensioner engineered to supply up to 65 pounds of tension on cable ties rated from 120 to 250 pounds. Featuring comfortable handle grips and compatibility with ties up to 15/32 inch wide, it combines ergonomic design with rugged durability, backed by Klein’s 160+ years of trusted craftsmanship.

Specifications

ASIN	B004G3RO5G
Best Sellers Rank	#32,192 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #28 in Tie-Down Ratcheting
Brand Name	KLEIN TOOLS
Color	Factory
Country of Publication	Taiwan
Customer Reviews	4.7 4.7 out of 5 stars (2,538)
Global Trade Identification Number	00092644865701
Included Components	Tools
Item Type Name	Nylon Tie Tensioning Tool
Item Weight	0.71 Pounds
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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