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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Description

🔪 Cut above the rest — precision blades that keep you ahead of the craft curve!

CRAFT LIKE A PRO - Perfect for 15" & 16" imported scroll saws, unlocking your creative potential
DURABILITY MEETS EASE - High-quality metal blades built to last with easy installation
SEAMLESS COMPATIBILITY - Designed for top brands like Sears Craftsman, Delta & Ryobi
PRECISION CUTTING POWER - Blades with 10-18.5 TPI for ultra-smooth, detailed cuts
ULTIMATE VERSATILITY PACK - 18 blades including 3 types for wood, plastic & delicate materials

The OLSON SAW FR49501 18-pack pin end scroll saw blades offer a versatile assortment of high-quality metal blades made in the USA. Compatible with 5" pinned blade scroll saws from major brands, these blades feature varying tooth counts (10-18.5 TPI) to handle hard and soft wood, plastic, and delicate materials with precision and durability. Ideal for professional and hobbyist woodworkers seeking reliable, easy-to-install blades for detailed cutting projects.

Specifications

Material	Metal
Brand	Olson
Product Dimensions	5"L x 0.1"W
Color	18 Pack
Number of Teeth	10
Style	Basic
Item Thickness	0.5 Inches
Item Weight	22.68 g
UPC	012373495017
Global Trade Identification Number	00012373495017
Manufacturer	Blackstone Industries, LLC
Part Number	SA4950
Item Weight	0.8 ounces
Item model number	FR49501
Is Discontinued By Manufacturer	No
Size	Blade
Finish	Pin End
Pattern	Saw Blade
Item Package Quantity	1
Number Of Pieces	18
Number of Handles	1
Included Components	Olson Saw FR49501 Pin End Scroll Saw Blade
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

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