will it work on Major safe co that has been broken into by the expert and given new combination numbers? Can I reset the numbers with this?

This key will let you reset the combination of S&G U8 3-wheel locks, but not other models like S&G 4-wheel locks. These keys are not interchangeable across lock models and manufacturers.

Will this work on a Cannon D-4557?

It will work if it a Sargent and Greenleaf lock. There are a great number of safes that use this lock.

The key part number l am looking for is u8, b01asvvij2, as given to me by the s& g company? can you help please?

This is the item. This is a U8, and the ASIN is B078YDX1WL. If you search for b01asvvij2 (not on Amazon but on a search engine) you'll find links that lead back here. Maybe that was an old or different kind of identifier for this item.

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Description

🔐 Upgrade your lock game—because your valuables deserve the best.

DURABLE METAL BUILD - Crafted from sturdy metal for long-lasting reliability and peace of mind.
COMPACT LIGHTWEIGHT - At just 2.39 ounces and slim dimensions, it fits neatly in your toolkit or drawer without bulk.
SEAMLESS COMPATIBILITY - Designed specifically for SARGENT & GREENLEAF 6600 & 6700 3-wheel locks, ensuring perfect fit and function.
MODERN MINIMALIST DESIGN - Sleek silver finish complements any professional or home environment with understated style.
EFFORTLESS SECURITY UPDATES - Easily change your combination with the included tool and clear instructions—no locksmith needed.

The SARGENT & GREENLEAF U8 Safe 3-Wheel Combination Lock Change Key is a precision-engineered metal tool designed to effortlessly update combinations on 6600 & 6700 series 3-wheel locks. Lightweight and compact, it includes clear instructions for quick, secure changes without professional help, making it an essential accessory for anyone serious about safeguarding valuables.

Specifications

Brand	Sargent & Greenleaf
Special Feature	Key Lock
Lock Type	Combination Lock
Material	Metal
Recommended Uses For Product	securing valuables, protecting personal belongings, or child-proofing certain areas
Style	Modern
Color	Silver
Number of Pieces	1
Finish Type	Unfinished
Included Components	Change tool, instructions
Controller Type	Hand Control
Shape	Rectangular
Item Weight	0.07 Kilograms
Control Method	Remote
Manufacturer	Sargent & Greenleaf
Part Number	6089864
Item Weight	2.39 ounces
Package Dimensions	7 x 4.3 x 0.3 inches
Item model number	53978a68-471b-4f5f-801d-13cb98e74f4c
Is Discontinued By Manufacturer	No
Finish	Unfinished
Item Package Quantity	1
Special Features	Key Lock
Batteries Included?	No
Batteries Required?	No

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