How should i think about tpi? is 24 or 32 better for cutting stainless bolts?

This article is informative; http://diyhousehelp.com/tools/choosing-the-correct-hacksaw-blade-tooth-count

How long will one of these blades last on average if you use it an average of once or twice a week for small projects?

Depends on the material. Copper and aluminum are soft metals. The blade is going to last a long time. Stainless steel and harden metals not as long. I use mine on all sorts of different materials and I get at least a year out of each blade.

Starrett green stripe vs Starrett red stripe blades? What is the difference?

I had no clue, so I googled it & this is what I found. Greenstripe® These hardened-milled tooth blades are shatter resistant and are the best blade for interrupted cuts or when the blade is subject to excessive stresses. Redstripe® Constructed of uniformly hardened high speed steel, these blades maintain their cutting edge on the most difficult to cut materials, held securely. Bluestripe® These precision ground tooth blades have a patented solid-state diffusion process which produces the industry's most advanced bi-metal hand hacksaw.

How well would this cut an aluminum hand guard on a paintball marker?

I've cut through steel with these blades. As long as the metal on the hand guard is not thinner than 1/32", and the correct technique is used, there should be no problem.

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🛠️ Cut with confidence, join the pros who never settle!

EFFORTLESS HANDLING - Designed for both professionals and amateurs, making every cut easier and more controlled.
PRECISION CUTTING POWER - 32 teeth per inch deliver smooth, accurate cuts on metals like steel, copper, and aluminum.
VERSATILE 12 INCH LENGTH - Ideal size for tight spaces and a variety of trades, from contractors to DIY pros.
TRUSTED LEGACY SINCE 1880 - Starrett’s century-plus commitment to quality guarantees reliability on every job.
DURABLE BI METAL CONSTRUCTION - Hardened cutting edge combined with a flexible back ensures long-lasting performance and resistance to bending.

The Starrett Bi-Metal Safe-Flex Hand Hacksaw Blade is a 12-inch, 32 TPI blade engineered for precision and durability. Its hardened cutting edge and flexible back make it perfect for cutting mild steel, copper, brass, and aluminum, especially in tight or awkward spaces. Trusted by contractors and tradesmen since 1880, this 2-pack offers professional-grade performance for both experts and DIY enthusiasts.

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Material	Metal
Brand	Starrett
Product Dimensions	11.81"L x 1.8"W
Color	Yellow
Number of Teeth	32
Style	2 Pack
Item Thickness	0.03 Inches
Item Weight	40 Grams
Compatible Material	Metal
Global Trade Identification Number	07891265403384
Manufacturer	Starrett
Part Number	KBS1232-2
Item Weight	1.41 ounces
Item model number	KBS1232-2
Is Discontinued By Manufacturer	No
Size	300mm 32tpi
Item Package Quantity	1
Number Of Pieces	2
Measurement System	Inch
Batteries Included?	No
Batteries Required?	No

Starrett Bi-Metal Unique HSS Safe-Flex Hand Hacksaw Blade - Ideal for Contractors and Tradesmen - 12" Length, 1/2" Width, 0.024" Thickness, 32 TPI - 2-Pack - KBS1232-2

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