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: 266395504

Details

Brand
Olson
Colour
18 Pack
Material
Metal
Number of teeth
20
Product dimensions
8.9L x 21.6W

🔩Fits 5" pinned scroll saws

🛠️20 TPI precision teeth

🇺🇸Made in USA quality

20348 Ft

Duties & taxes included

In stock

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Description

🔪 Cut like a pro, every time — don’t get left behind!

TRUSTED TOP RANKED - Ranked #3 in Scroll Saw Blades with 4.6-star rating from 4,700+ pros
DURABILITY MEETS EASE - High-quality metal blades built to last with effortless installation and handling
SEAMLESS COMPATIBILITY - Designed for Delta, Ryobi, and most 15" & 16" scroll saws with 5" pinned blades
PRECISION CUTTING POWER - 20 teeth per inch for smooth, accurate cuts in wood and plastic
VERSATILE MATERIAL MASTERY - Efficiently slices through hard and soft wood as well as plastics thicker than 1/8"

The Olson SAW FR49501 18-Pack Pin End Scroll Saw Blades deliver professional-grade precision with 20 teeth per inch, engineered for 5" pinned scroll saws like Delta and Ryobi. Made in the USA, these durable blades handle hard and soft wood plus plastics over 1/8" thick, offering versatile, easy installation and trusted performance favored by thousands of users.

Specifications

ASIN	B000G33Q6Q
ASIN	B000G33Q6Q
Best Sellers Rank	#69,315 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Scroll Saw Blades
Brand Name	Olson
Color	18 Pack
Compatible Devices	Scroll Saws
Compatible Material	Plastic, Wood
Customer Reviews	4.6 4.6 out of 5 stars (4,744)
Customer reviews	4.6 4.6 out of 5 stars (4,744)
Date First Available	7 August 2012
Department	Unisex-Adult
Global Trade Identification Number	00012373495017
Included Components	Olson Saw FR49501 Pin End Scroll Saw Blade
Is Discontinued By Manufacturer	No
Item Dimensions L x W	8.9L x 21.6W centimeters
Item Thickness	0.5 Inches
Item Type Name	Olson Saw FR49501 Pin End Scroll Saw Blade
Item Weight	0.05 Pounds
Item model number	FR49501
Manufacturer	Shesto Ltd
Manufacturer	Shesto Ltd
Material Type	Metal
Model	FR49501
Number of Items	1
Number of Teeth	20
Part Number	SA4950
Product Dimensions	8.89 x 21.59 x 2.54 cm; 22.68 g
Set Name	Olson FR49501 18-Pack Pin End Scroll Saw Blade Assortment
Style Name	Basic
UPC	012373495017

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