I am truly a beginner { wen 16" model #3920}. i am reading/video/hearing a lot on people calling the blades by numbers. #5 #7 #9 why?

The number refers to the thickness and width of the blade from front to back. The higher the number, the thicker and heavier the blade. A #9 blade, for instance is much thicker (and stronger) than a #4 blade. Thick, heavy blades typically cut faster and last longer than fine, precision blades cutting the same material. The drawback is that they cannot accomplish very tight curves well, and it is impossible to make a 180° turn without leaving a massive hole where you did it. A #3 or #4 can accomplish this easily, but if you try to cut a piece of 3/4" hardwood, they will last about 10 seconds before breaking! I hope this helps a bit. I've been scrolling for about 20 years off and on, and it's much easier to demonstrate this than to explain it without visual aids.

Yes. My son has a craftsman and these are what he uses.

will these work on an Delta 15" model 40 150 scroll saw?

I have not use it on DELTA but you can see the size of existing blade, if the size of existing blade is 5 inch then you can buy this and it should work on delta then. Apart from that, Delta should support Pin end blades. (which I am think it should)

Will these blades work in a Delta 40-694 Scroll Saw?

I do not have that model scroll saw but the saw blades are standard pin end blades and if the Delta 40-694 takes pin end blades I would think that they would work.

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OLSON SAW FR49501 Pin End Scroll Saw Blade,18 Pack

Product ID: 3610473

Details

Brand
Olson
Color
18 Pack
Item Thickness
0.5 Inches
Item Weight
0.05 Pounds
Material
Metal
Number of Teeth
10

🌲Cuts wood & plastic with precision

🛠️5" pinned blades fit top scroll saws

🇺🇸Proudly made in USA

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€ 26.28

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Description

🔪 Cut above the rest — precision blades for the discerning maker!

TRUSTED QUALITY - Manufactured in the USA with a 4.6-star rating from thousands of pros.
PRECISION ASSORTMENT - Includes 3 blade types (18 total) tailored for thin to thick materials.
DURABILITY MEETS EASE - High-quality metal blades designed for long-lasting use and easy installation.
UNIVERSAL COMPATIBILITY - Fits major brands like Sears Craftsman, Delta & Ryobi for seamless integration.
VERSATILE CUTTING POWER - Handles hard & soft wood plus plastic, perfect for diverse projects.

The OLSON SAW FR49501 18-pack pin end scroll saw blades offer a versatile, durable solution for 5" pinned blade scroll saws. Compatible with top brands like Sears Craftsman and Delta, this assortment includes three blade types optimized for cutting wood, plastic, and other materials with precision. Proudly made in the USA, these blades combine easy installation with professional-grade performance, earning high customer satisfaction.

Specifications

ASIN	B000G33Q6Q
Best Sellers Rank	#522,175 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #117 in Scroll Saw Blades
Brand Name	Olson
Color	18 Pack
Compatible Material	Plastic, Wood
Customer Reviews	4.6 4.6 out of 5 stars (4,876)
Global Trade Identification Number	00012373495017
Included Components	Olson Saw FR49501 Pin End Scroll Saw Blade
Item Dimensions L x W	5"L x 0.1"W
Item Thickness	0.5 Inches
Item Type Name	Olson Saw FR49501 Pin End Scroll Saw Blade
Item Weight	0.05 Pounds
Manufacturer	Blackstone Industries, LLC
Material Type	Metal
Model	FR49501
Number of Teeth	10
Part Number	SA4950
Style Name	Basic
UPC	012373495017
Unit Count	1.0 Count
Warranty Description	Warranty

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