what is the thread, m22 or 1/2"bsp?

Hello, please see the following information provided by Starrett; Hole Saw arbor supplied with 6.35mm (1/4") pilot drill. Shank size 11mm (7/16"). Screw thread 5/8"-18. Screw thread 5/8"-18. Fits hole saws from 32-210mm (1.1./4 - 8.9/32") diameter. Arbor suitable for use with SH, DH, CT and D hole saws (Diamond hole saw applications will usually require an arbor with a carbide tipped pilot drill). I hope this helps. Kind regards, Amy

will the starrett 300mm extension fit on this arbor because i want to go in a fair bit

Good morning, the extension should fit fine. Kind regards, Amy

Will it fits drilling machine with 3 jaw chuck? My drill is from '90s

Good Morning, If you drill has the below requirement. I should not see why not this would not fit. Shank Size: 7/16in Hex suitable to fit 1/2in capacity chuck.Use with holesaws H0114 - H210 mm inclusive 1.1/4 - 8. 9/32in. (32 mm - 152mm).Kind Regards Jodie

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Starrett A2 Hole Saws Arbor - 32-210mm Quick Hitch Screw Thread Hex Shank Arbor with 6.35mm High-Speed Steel Pilot Drill - Quick Change Mandrel

Starrett A2 Hole Saws Arbor - 32-210mm Quick Hitch Screw Thread Hex Shank Arbor with 6.35mm High-Speed Steel Pilot Drill - Quick Change Mandrel

Product ID: 48158449

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Details

Material
Metal
Brand
Starrett
Colour
Black
Style
Single
Item weight
240 g
UPC
049659551426

🔩Fits 32-210mm hole saws

⏱️Quick-release quick-hitch system

⚙️Heavy-duty carbon steel build

Description

⚡ Drill Smarter, Not Harder – The Pro’s Quick-Hitch Power Tool Upgrade

BUILT TO LAST - Premium high-quality steel arbor designed for maximum durability and longevity
COMPACT PORTABLE - Lightweight and compact design fits easily in your tool bag for on-the-go projects
PRECISION PILOT DRILL - Includes a 6.35mm high-speed steel pilot drill for accurate, clean starts
EFFORTLESS QUICK CHANGE - Switch hole saws in seconds without tools or chuck removal
UNIVERSAL COMPATIBILITY - Fits hole saws from 32mm up to 210mm, perfect for any professional job

The Starrett A2 Hole Saws Arbor is a robust, carbon steel quick-change mandrel designed for professionals who demand precision and efficiency. Compatible with hole saws ranging from 32mm to 210mm, it features a quick-release hitch for tool-free saw swaps and includes a high-speed steel pilot drill for flawless drilling starts. Compact and durable, this arbor ensures secure, slip-free operation on any job site.

Specifications

Manufacturer	Starrett
Part number	55142/A2
Item Weight	240 g
Product Dimensions	4 x 15 x 3.8 cm; 240.4 g
Item model number	AY141
Size	A2
Colour	Black
Style	Single
Material	Metal
Item Package Quantity	1
Number of Pieces	1
Included components	1 x A2 Arbour To Suit 32 mm - 210 mm Hole saws
Batteries included?	No
Batteries Required?	No

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