How long is the overall length of the mandrel?

Thank you for contacting Dremel, The overall length of the 402 mandrel is 11/8" Almost 1-1/2" Adrian Customer Experience Support 800-437-3635

what is the diameter of the screw, IOW what size hole does the disc need ?

Hole diameter = .076 Screw head dia. = .176

Do these have/are they supposed to have 2 little red washers? Although my Dremel mandrel doesn't have any, looks like most others I've seen have them?

I have seen them both ways. Mine does not have the washers. Works fine

Will this fit the B&D RTX-B or is it only for Dremel tools?

I have a blue hawk rotary tool & it fits it fine. So if your buying something that fits a Dremel, it will fit another rotary like the Dremel

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402 Mandrel, Silver

Product ID: 11433383

Details

Brand
Dremel
Material
Alloy Steel
Item Diameter
0.13 Inches
Item Weight
0.2 Ounces
Compatible Devices
Drilling Lathe

📏0.13 inch cutting capacity

🔒Manual keyless lock

🔩1/8 inch thread size

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£3.14

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Description

🔧 Unlock your creative potential with the Dremel 402 Mandrel!

COMPACT POWERHOUSE - Slim 4 x 2 x 0.2 inch design fits seamlessly into your toolkit
LIGHTWEIGHT EFFICIENCY - At just 0.2 ounces, it adds no bulk but maximizes performance
VERSATILE COMPATIBILITY - Works flawlessly with a wide range of Dremel rotary tool attachments
DURABILITY YOU CAN TRUST - Engineered by Dremel for consistent, long-lasting use in every project
PRECISION FIT ZERO HASSLE - Hand-tightened handle ensures quick, secure accessory changes without tools

The Dremel 402 Mandrel is a precision-engineered, hand-tightened accessory holder featuring a 1/8 inch thread size and 0.13 inch cutting capacity. Its manual keyless lock design allows for fast, tool-free accessory changes. Lightweight and compact, this durable mandrel is compatible with a broad range of Dremel rotary tool attachments, making it an essential upgrade for any professional or DIY enthusiast.

Specifications

Thread Size	1/8 inch
Capacity	0.13 Inches
Handle Type	hand-tightened
Included Components	Power Tool Accessories^Grinder & Chop Saw Accessories^Power Rotary Tool Attachments
Lock Type	Manual, Keyless
Global Trade Identification Number	00080596004026
Manufacturer	DREMEL MFG CO
UPC	080596004026
Part Number	402
Item Weight	0.2 ounces
Product Dimensions	4 x 2 x 0.2 inches
Item model number	402
Is Discontinued By Manufacturer	No
Size	1 Count (Pack of 1)
Color	Dimgray
Shape	Shape
Thickness	item_thickness.string_value Inches
Power Source	Hand Powered
Item Package Quantity	1
Number Of Pieces	1
Cutting Diameter	0.13 Inches
Measurement System	Metric
Batteries Included?	No
Batteries Required?	No
Warranty Description	No
National Stock Number	5130-01-388-2434

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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