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Full Nuts are the most regularly used mating nut with a bolt or screw.
Full Nuts are either cold or hot forged depending on the diameter size. They can also be machined from bar.

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Description	Price	Buy
M3 Hexagon Full Nuts Zinc Plated	£0.50 / Box of 50
M4 Hexagon Full Nuts Zinc Plated	£0.50 / Box of 50
M5 Hexagon Full Nuts Zinc Plated	£0.50 / Box of 50
M6 Hexagon Full Nuts Zinc Plated	£1.00 / Box of 50
M8 Hexagon Full Nuts Zinc Plated	£0.60 / Box of 25
M10 Hexagon Full Nuts Zinc Plated	£1.38 / Box of 25
M12 Hexagon Full Nuts Zinc Plated	£2.02 / Box of 25
M16 Hexagon Full Nuts Zinc Plated	£4.12 / Box of 25
M20 Hexagon Full Nuts Zinc Plated	£3.15 / Box of 10
M24 Hexagon Full Nuts Zinc Plated	£6.99 / Box of 10
M30 Hexagon Full Nuts Zinc Plated	£20.13 / Box of 10

Slotted Nuts are standard nuts in accordance with nut Style 2. The contours and the depth of the slots are very important with regard to the strength characteristics of the nut when in application.
Slotted nuts are available in various property classes, both heat-treated and non-heat treated. The designating of the strength grades is obligatory and must be identified by marking the nut.
The application of slotted nuts is unique to the use of steel pins and taper or split pins, to lock the slotted nut into position after tightening. The pin is inserted through the slot and a hole passing through the fastener to secure a substantial joint.

Castle Nuts are forged and also machined.
The difference between a slotted nut and a castle nut is the latter has turret geometry on the top of the nut. The nut thicknesses are the same as a slotted nut.
Like slotted nuts, castle nut applications are similar using steel pins and taper or split pins, to lock the nut into position after tightening. The pin is inserted through the slot and a hole through the fastener to secure the joint.
Castle nuts are used when the locking pins are required to be flush with the diameter of the turret. This is useful for those applications where confined space is at a minimum and pin protrusion is unacceptable.
Castle nuts are both heat-treated and also non-heat treated. Strength grades must be identified and marked on the nut accordingly.

Lock nuts are available in various materials and finishes; carbon steel, stainless steel, brass etc.
M16 diameter and below have a double chamfer.
Above M20 the top surface has a chamfer, whilst the underside will have a washer bearing surface.
Useful in combination with small diameter rolled thread machine screws.
Not ideal for load bearing bolted joint assemblies but useful when used in combination with plain nuts, noting that the lock nut should be in contact with the mating surface of the joint and the plain nut assembled on top. This assists rigidity when required.

Self-Locking Nuts, also referred to as 'Stiffnuts', are prevailing torque nuts.
Either the internal threads have an engineered interference system to resist loosening, or there is some other device inserted e.g. a Nylon insert into the nut, or deforming the diameter to prevent the nut from loosening under vibration.
There are many proprietary designs, in various materials, and testing is advisable to establish the resistance to vibration and fatigue.
The reference standard for prevailing torque type steel nuts is ISO 2320:1997.
Self-locking nuts only work in one direction, related to the position of the element of interference.
Referral to your supplier on the various types self-locking nuts is advisable.
Without any preference, a selection of branded self-locking nut types is listed for guidance.
Nylon Insert Nut
Philidas Industrial Nut
Philidas Turret Nut
Binx Nut
Philidas MK8 Nut
Aerotight Nut