How many threads per inch on the bolt, just bought the one for 3/8 holes and try to get a 1/4 hardened bolt from some store. I needed the 1/4 inch

it's a 1/4 inch X 28 threads per inch, which is a standard 1/4 National Fine Thread bolt

What is the maximum rpm for this mandrel?

I use it at 24,000 every time i use it which is atleast once a day. You should be good.

Can these be used with dremel 426b fiberglass reinforced cut-off wheels ?

The 56490 cannot be used with the Dremel cutoff wheel. The 56490 has a 3/8” mounting thread. The Dremel wheel has a 1/8” hole.

How do these work for stainless steel or steel in general?

I used these when restoring an older pickup truck to cut away some rusted areas. They worked very well on steel and were just right to get into some tight spots. Being thin they cut through fast and were easy to control for straight cuts.

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⚡ Cut with confidence, install with ease!

READY TO WORK - No batteries or extra parts needed—just mount and go.
DURABLE CARBON STEEL - Built tough to withstand rigorous cutting tasks without compromise.
COMPACT LIGHTWEIGHT - Weighs just 36.3g with sleek dimensions for easy handling and storage.
UNIVERSAL COMPATIBILITY - Standard 1/4" shank diameter fits most power tools effortlessly.
PRECISION FIT EVERY TIME - Engineered to fit 3/8" holes perfectly for seamless installation.

The Mandrel F-Cutoff Wheel Installation Wyler 804-56490 is a precision-engineered carbon steel mandrel featuring a 1/4" shank diameter and designed to fit 3/8" holes. Lightweight at just 36.3 grams, it offers durable performance and universal compatibility for professional-grade cutoff wheel installations.

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Manufacturer	WEILER
Part number	Weiler 56490
Item Weight	36.3 g
Product Dimensions	10.16 x 5.08 x 0.25 cm; 36.29 g
Is Discontinued By Manufacturer	No
Material	Carbon Steel
Grit Rating	1
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	10.2 x 5.1 x 0.3 cm

Mandrel F-Cutoff Wheel Installation Wyler 804-56490

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