Maybe they will be ok but why take a chance. Castle nuts are nuts that look like crowns or parapets of mid evil castles.

Details About Stainless Steel Cotter Pin Castle Nut 5 8 18 Unf Qty 1
Castle nuts and cotter pins. Height includes the slots. These nuts are used together with a bolt and a cotter pin to create a secure nut in place so that it cannot be tightened or loosened. Use cotter pins to lock a castle nut or secure a clevis pin. The nut is then secured with a split pincotter pin r clip or safety wire. Cotter pins while not considered necessary to every installation may be necessary depending on the application. A cotter pin is easy to install and remove and is commonly used to secure a wheel or machine component on an axle.
The nut is torqued properly and then if the slot is not aligned with the hole in the fastener the nut is rotated forward to the nearest slot. Not true with the prevailing torque or nylock nuts. I too was schooled to move the nut to the closest location for the hole in the rod bolt. Castellated nuts are used in low torque applications such as holding a wheel bearing in place. In this example note the head of the cotter pin is set parallel to the length of the axle and is actually set down into one of the notches of the castle nut. It is a positive locking device.
A split pin has two long tines that are bent to hold it in place. The carry on castle nut kit includes. A motorcycle front wheel is often held on by a castle nut and a cotter pin as it is subject to intense constant vibrations. Hairpin clips also called r clips are designed to slip on with no bending required. Trailer parts superstore offers a large selection of axle spindle nuts washers tang washers and cotter pins at discount pricing. Hairpin clips also called r clips are designed to slip on with no bending required.
Designed to be used with carry on 1 116 spindles. 1 1 14 nut 1 1 id washer and 1 18 2 cotter pin. A cotter pin is easy to install and remove and is commonly used to secure a wheel or machine component on an axle. One leg of the pin is bent back against the flat of the nut the other is bent up around the end of the axle and pressed tight against the axle end. Cotter pins have two measurements that matter for an installation. If you use a castle nut and wire or cotter pin the nut will never come off.
How are cotter pins measured. A split pin has two long tines that are bent to hold it in place. Easy to use online store with secure checkout. Cotter pins are not included. Also known as castle nuts secure these nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. Use cotter pins to lock a castle nut or secure a clevis pin.
Theyre not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress.