4 grades available
$1.25-$4.00 each
No additional S&H charge for Cotters when mailed
with Cotter Press and/or
Fixed
Cup tool
Shipped seperately; First class; $5 S&H for the 1st
pair
$0.40 for each additional pair - Or $7 Priority Mail
(12 or more cotters ship Priority Mail for $7)
Click
here
for ordering, payment and shipping info
MN residents add 6.875% sales tax
(7.775% if you are in the metro area)
Grade A cotters are fully machined from 3/8" (9.5mm) or 9.0mm steel. Even the nuts are turned on a lathe. Both ends are domed to prevent mushrooming when they are installed or removed. The threaded stems are larger, 7mm and the washers are thicker and harder.
When you compare the moments of inertia for the actual root diameters of rolled 6mm and 7mm threads, you see that the larger threads have twice the resistance to bending. This is irrelevant in use, but potentially a big deal when trying to remove one that is really stuck. 
Modified (Raleigh) cut $4.00 each - Cut is 24mm long and 1.8 mm deep - 7mm stem
Original cut $3.25 each - Cut is 18mm long and 1.35 mm deep - 7mm stem
The 9.5mm Grade A cotters finally came in but they are not as advertised. The factory listed only "Full Cut" which would be a good fit for Raleighs. But when they showed up they were cut much less deeply. For non-Raleigh owners, this is a good thing. Cotters cut to fit Raleighs go in too far for many other cranks. Filing cotters to fit whatever cranks you are working on used to be the norm.
These days, not everyone is comfortable trying to file a pair of cotters to the correct depth and and at the same angle. So, I made a fixture that allows me to accurately remove more metal to make them a good fit for the typical Raleigh crank. Unfortunately modifying the cotters eats up time,l so I have to charge $4 each for the modified ones vs. $3.25 for the unmodified cotters.
9.0mm French Grade A $3.50
each - 4 Different Cuts In
Stock
9.0mm Grade A Cotter Details (Dimensions approximate due to
manufacturing tolerances.)
1/2 Cut : Cut is
16mm long and 1.0 mm deep - 7mm stem (Temporarily out, more have been ordered)
3/4 Cut : Cut is
20mm long and 1.3 mm deep - 7mm stem (Temporarily out, more have been ordered)
Full Cut : Cut is 23mm long
and 1.5 mm deep - 7 mm stem
Peugeot Cut : Cut tapers from 2.1mm to 0.3mm - 6 mm stem
Not all Peugeots take the
“Peugeot Cut” cotters. Some with Nervar cranks take a ¾ cut and
they may require some filing to fit. Do the flats on your current cotters extend all the way to the end, like the “Peugeot Cut” cotter shown above?
Grade B - $4.50/pair
9.5mmEnglish - Out of Stock
8.8 mm (Sort of French) Out of Stock
Ramps are smoothly machined. Both ends are domed to prevent mushrooming when they are installed or removed. The threaded stems are 6mm.
Demand for Grade Bs has been so light that I won't restock unless I need something else from that supplier.
Grade C - $2.00 Each (These may be gone for good but I'm always looking for more.)
9.5mm English - Out of stock
9.0mm French - Out of stock
Ramps are machined. Fat end is domed to prevent mushrooming when they are installed. The threaded stems are 6mm.
Grade D - $1.25 Each
9.5mm English - Out of stock
9.0mm French - Out of stock
These are what the major importers are bringing in today. The newest cotters are just pinched off a piece of rod, rolled and mashed into a usable shape. Since the bevel is just stomped into place, there is a bulge at the sides. So, they have to use undersized, 9.2mm or 8.7mm rod so the bulge won't keep them from fitting into a 9.5mm or 9.0mm hole.
However at $1.25 each they are good enough for your brother-in-law's bike.