can this machine sew thru heavy duty canvas or leather?

This machine is not designed for leather or heavy duty canvas. It could possibility sew through 2 layers of canvas with the correct needle but that is about as heavy as it could take. I have no problem sewing up to 3 layers of denim or 2 layers of upholstery vinyl, but heavier items could damage the machine. It is a wonderful little machine that I use 6-8 hours daily but really not designed for industrial sewing of heavy utility fabrics.

Can I use my metal bobbins in my machine or do I need to use the plastic ones?

All top load machines use plastic bobbins except for older early singers with metal bobbin case,there is a magnetic ring attached to the hook center that holds the plastic bobbin case from rattling and to slow its movement, if you use metal bobbins they become held by the magnetic transfer through the bobbin case floor (metal) and limit or restrict bobbin rotation,if you remove the magnet you can use the metal bobbins,however it will be noisey and excelarate wear on the bobbin case

does this machine have foot pedal?

It does have a foot pedal which is on the short side but I have it anchored on a wood flooring sample with double sided tape. That solves the problem of it not quite reaching the floor, and because the pedal is light as a feather it was always turned around, upside down or on it’s side when I went to step on it but not now.

can a beginner use this machine.. i am thinking about the speed

Yes - This is one of the easiest machines to use. You will get used to the foot pedal very fast to control the speed. I have given several of these machines away as presents. I also keep two of these machines at all times.They get used of leather work, quilting and wearable art such as jackets and shirts. A great machine !!!

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SINGER® Heavy Duty 4423 (Grey) High Speed Sewing Machine + Accessories | 23 Built-In Stitches Deliver 97 Stitch Applications | 50% More Power, 1100 Stitches/Min | Metal Frame, 1-Step Buttonhole

Product ID: 1543717

Details

Brand
SINGER
Color
Grey
Global Trade Identification Number
Input Voltage
120 Volts
Is Electric
Yes
Item Weight
17.1 Pounds

⚡1100 stitches/min high-speed power

🧵23 built-in stitches, 97 applications

🛠️Heavy-duty metal frame for durability

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€ 582.53

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧵 Power Your Passion with Every Stitch!

EFFORTLESS PRECISION - Automatic needle threader and LED lighting reduce eye strain and speed up your workflow—perfect for late-night creative bursts.
UNMATCHED SPEED POWER - Sew through thick fabrics effortlessly with 50% more motor power and 1100 stitches per minute—because your creativity shouldn’t wait.
ALL INCLUSIVE ACCESSORY KIT - Includes essential presser feet, quilting guide, bobbins, and a soft dust cover—everything you need to start sewing like a pro right out of the box.
BUILT TO LAST BUILT FOR YOU - Heavy-duty metal interior frame and stainless steel bedplate ensure stability and skip-free sewing for years of professional results.
VERSATILITY AT YOUR FINGERTIPS - 23 built-in stitches delivering 97 stitch applications let you master everything from basic hems to intricate decorative designs.

The SINGER® Heavy Duty 4423 is a high-speed, durable sewing machine featuring a powerful motor that delivers 1100 stitches per minute and 23 built-in stitches for 97 versatile applications. Its heavy-duty metal frame and stainless steel bedplate provide long-lasting stability, while convenient features like an automatic needle threader and LED lighting enhance precision. Complete with a comprehensive accessory kit, this machine is designed to handle everything from lightweight fabrics to thick layers, making it the ultimate tool for both professional and passionate home sewers.

Specifications

ASIN	B003VWXZQ0
Best Sellers Rank	#2,891 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #15 in Sewing Machines
Brand Name	SINGER
Color	Grey
Customer Reviews	4.5 4.5 out of 5 stars (21,131)
Global Trade Identification Number	00037431883018
Included Components	Included Accessories: All-Purpose Foot, Zipper Foot, Buttonhole Foot, Button Sewing Foot, Seam Ripper / Lint Brush, Quilting Guide, Needles, Bobbins, Screwdriver, Auxiliary Spool Pin, Spool Pin Felt, Soft-Sided Dust Cover.
Input Voltage	120 Volts
Is Electric	Yes
Item Dimensions D x W x H	6.25"D x 15"W x 12"H
Item Type Name	Sewing Machine
Item Weight	17.1 Pounds
Manufacturer	SINGER
Material	Plastic
Model Number	4423
Part Number	4423.CL
Power Source	Corded Electric
UPC	037431883018
Unit Count	1.0 Count
Warranty Description	25 year limited parts; 90 days full coverage.

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