what size fits a 1/2" shaft on a toy wagon?

Maximum diameter in that set is 7/16". Nothing in that set will fit a 1/2" shaft.

Does this case include something similar to a lock washer that would fit a 5/8 inch axle rod?

Not 5/8 “,probably more like 1/2 “

Are these rust proof?

Not sure made with carbon steel they look like they have a coating on them to prevent rusting ...

Would M6 be too tight for 1/4" ?

M6 is 6mm ; 1/4 is 6.35mm, I consider it an appropriate tolerance to use it as described

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Glarks 280Pcs Internal Tooth Starlock Push On Locking Washers Speed Clips Fasteners Assortment Kit

Glarks 280Pcs Internal Tooth Starlock Push On Locking Washers Speed Clips Fasteners Assortment Kit

Product ID: 415616382

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Details

Material
Medium Carbon
Outside Diameter
12 Millimetres
Washer Type
Internal Tooth
Exterior Finish
Alloy Steel
Fastener Size
M3 M4 M5 M6 M8

📦7 versatile sizes

⚙️280 precision washers

🛡️65Mn hardened steel

Description

🔩 Lock in reliability, unlock your project’s potential!

BUILT TO LAST - Crafted from premium 65Mn steel ensuring unmatched durability and corrosion resistance
ORGANIZED READY - Transparent, compact storage box keeps your fasteners sorted and accessible
SECURE GRIP TECHNOLOGY - Internal tooth design delivers superior friction and anti-rotation locking force
ALL IN ONE FASTENING POWER - 280 star lock washers covering M3 to M12 sizes for every project need
INDUSTRIAL GRADE PERFORMANCE - Ideal for shock absorption and insulation in heavy machinery and production lines

The Glarks 280Pcs Internal Tooth Starlock Push On Locking Washers Kit features high-precision washers made from durable 65Mn carbon steel. With 7 sizes ranging from M3 to M12, this assortment offers versatile, industrial-grade fasteners designed to enhance friction and prevent rotation in machinery applications. Packaged in a transparent box for easy organization, it’s the ultimate solution for professionals seeking reliable shock absorption and insulation hardware.

Specifications

Material	Medium Carbon Steel
Outside Diameter	12 Millimetres
Washer Type	Internal Tooth Lock
Exterior Finish	Alloy Steel
Fastener Size	M3 M4 M5 M6 M8 M10 M12
Size	3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm
Metal Type	Carbon Steel
Brand	Glarks
Item Weight	0.19 Kilograms
Number of Pieces	280
UPC	709886212018
Manufacturer	Glarks
Global Trade Identification Number	00709886212018
Country of Origin	USA
Item model number	GLALW-2
Package Dimensions	17.3 x 9.9 x 2.2 cm; 190 g
ASIN	B076D3FZM4

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