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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Weiler 56490 Mounting Mandrel For Cut-Off Wheels W/3/8" Arbor Hole, 1/4" Stem

Product ID: 23085248

Details

Brand
Weiler
Compatible Devices
Die Grinder
Grit Material
Carbon Steel
Grit Type
Coarse
Product Dimensions
4"L x 2"W

💪Durable carbon steel construction

⚙️3/8" Arbor Hole for Type 1 discs

🛠️Fits 0.035" to 1/4" thick cut-off wheels

19395CFA

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Description

🛠️ Cut with Confidence, Mount with Precision!

TRUSTED LEGACY BRAND - From Weiler, a 4th generation family-owned company known for quality and innovation since 1945.
LIGHTWEIGHT YET RUGGED - Crafted from carbon steel, this mandrel balances durability with ease of handling for extended tool life.
SECURE LOCKING MECHANISM - Flathead notch and threaded screw design guarantee a tight, wobble-free fit every time.
VERSATILE WHEEL THICKNESS RANGE - Accommodates cut-off wheels from ultra-thin 0.035" up to robust 1/4" thickness for diverse cutting tasks.
PRECISION FIT FOR MAXIMUM CONTROL - 3/8" arbor hole and 1/4" stem ensure seamless compatibility with most die grinders and air tools.

The Weiler 56490 Mounting Mandrel is a precision-engineered tool accessory designed to securely hold Type 1 cut-off wheels with a 3/8" arbor hole on grinders with a 1/4" stem. Made from durable carbon steel, it supports wheel thicknesses from 0.035" to 1/4", ensuring versatility and long-lasting performance for professional-grade cutting applications.

Specifications

ASIN	B004FTPWKK
Additional Features	Lightweight
Best Sellers Rank	#19,465 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Abrasive Mandrels
Brand	Weiler
Brand Name	Weiler
Compatible Devices	Die Grinder
Compatible Material	Steel
Construction Type	Cut-off Wheels
Customer Reviews	4.7 out of 5 stars 5,117 Reviews
Global Trade Identification Number	00012382564902, 50012382564907
Grit Material	Carbon Steel
Grit Material Type	Carbon Steel
Grit Number	1
Grit Type	Coarse
Included Components	Weiler 56490
Industry Standard Identifier	56490
Item Dimensions L x W	4"L x 2"W
Item Thickness	0.04 inches
Item Weight	1.28 ounces
Manufacturer	Weiler Corporation
Material Type	Carbon Steel
Model	56490
Number of Items	1
Part Number	Weiler 56490
Product Dimensions	4"L x 2"W
Recommended Uses For Product	Cutting
UPC	012382564902 640026931393 640024988726 040962564691 636123542341
Unit Count	1 Count
Warranty Description	Manufacturer

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19395CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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