I need to use my mayhew 66000 set to make 7/16" id x 3/4" od gaskets. can i buy a 7/16" punch to fit the inner, threaded mount?

Maybe. The 7/16 punch is available separately (I searched for "mayhew 7/16"). Not sure if the 7/16 and 3/4 punches can be used together. It depends on the size range. Punches are in different size ranges depending on where they affix to the punch body. Any punch can be used with one from the next size range up.

If purchased here is the manufacturer warranty valid for defects in materials and workmanship?

Contact the manufacturer, I'm sure they will help you

Does the punch size refer to the diameter of the hole made or the diameter of the discs removed from the hollow punch?

It refers to the size hole it makes

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Mayhew Pro 66002 1/8-Inch to 2-Inch Imperial SAE Hollow Punch Set

Mayhew Pro 66002 1/8-Inch to 2-Inch Imperial SAE Hollow Punch Set

Product ID: 255738241

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Details

Material
Metal
Colour
Black
Brand
Mayhew
Product dimensions
32.4L x 27.9W
Item weight
2.85 Pounds

📏27 precision sizes 1/8"–2"

⚙️Dual cutting heads for concentric punches

🛠️Durable metal with brushed finish

Description

🛠️ Punch Perfect Every Time — Because Precision is Power

DOUBLE THE IMPACT - Dual cutting heads let you craft perfect concentric circles in a single, efficient strike.
COMPACT ORGANIZED - Comes in a sleek plastic case to keep your tools neatly stored and ready for action.
HAND POWERED RELIABILITY - No batteries needed—pure mechanical power for consistent, on-demand performance.
PRECISION IN EVERY PUNCH - 27 hollow punches cover a wide range of ID and OD sizes for flawless gasket and washer creation.
VERSATILE MATERIAL COMPATIBILITY - Ideal for softer materials like leather, vinyl, cloth, light sheet metal, and gasket materials.

The Pro 66002 Hollow Punch Set by Mayhew features 27 imperial SAE sizes ranging from 1/8" to 2", crafted from durable metal with a brushed finish. Equipped with dual cutting heads, it enables efficient concentric punching in softer materials like leather, vinyl, and light sheet metal. This hand-powered toolset comes neatly organized in a plastic case, making it an essential precision punch kit for professionals seeking flawless gasket and washer fabrication.

Specifications

Manufacturer	Mayhew
Part number	66002
Item Weight	1.29 Kilograms
Product Dimensions	30.48 x 25.4 x 7.62 cm; 1.29 kg
Item model number	66002
Size	1/8-Inch to 2-Inch 27 piece
Color	Black
Style	Imperial SAE
Finish	Brushed
Material	Metal
Pattern	Punch Set
Shape	Rectangular
Power source type	Hand Powered
Item Package Quantity	1
Number Of Pieces	27
Number of Holes	27
Number of Handles	1
Measurement System	standard
Specification met	Energy Star
Included components	27 PC Hollow Punch Set (SAE)
Batteries Included?	No
Batteries Required?	No

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