A: It depends.If we have bulk goods in stock, we can ship goods within 3 days after the QC process. If we don’t have stock, normally it takes 7-15 days for OEM samples and 20-30 days for bulk goods. If it refers to opening the new mold, it takes an extra 7-15 days to make the mold.
Slotted Round Nut
Slotted Round Nuts (Castellated Nuts): Overview
Material:
- Common materials: Carbon steel (Grade 4.8/8.8), stainless steel (304/316), alloy steel (heat-treated), or brass.
- Surface treatments: Zinc plating, hot-dip galvanizing, Dacromet coating, or passivation (for stainless steel) to resist corrosion.
Manufacturing Process:
- Cold Forging: Forms the basic round shape and internal threads from metal wire.
- Slot Machining: Precision milling or stamping of radial slots (castellations) around the nut’s circumference.
- Thread Rolling: Creates internal threads (metric/SAE) compatible with bolts and clevis pins.
- Heat Treatment: Applied to carbon/alloy steel for enhanced hardness and tensile strength.
- Surface Finishing: Coating or polishing for corrosion resistance and smooth installation.
Key Production Considerations:
- Slot alignment: Uniform depth, spacing, and symmetry for proper cotter pin/wire insertion.
- Thread accuracy: Ensures smooth engagement with bolts and prevents cross-threading.
- Material hardness: Post-heat treatment hardness (e.g., HRC 22-32) must balance strength and ductility.
- Coating adhesion: Avoids flaking on slots or threads during installation.
Applications:
- Automotive: Wheel hubs, axle assemblies, and suspension systems.
- Heavy machinery: Rotating shafts, gearboxes, and hydraulic systems under vibration.
- Aerospace: Flight control linkages and landing gear assemblies.
- Agriculture: Tractor PTO shafts and tillage equipment.
- Marine: Propeller shafts and rigging components.
Installation:
- Thread engagement: Tighten the nut onto the bolt until the slot aligns with the bolt’s pre-drilled hole.
- Cotter pin/wire insertion: Insert a cotter pin or safety wire through the nut’s slot and bolt hole.
- Securing: Bend the cotter pin ends or twist the wire to lock the nut in place.
- Torque control: Follow manufacturer torque specs to avoid overloading threads.
- Inspection: Verify the pin/wire is secure and the nut cannot rotate freely.
Note:
- Safety compliance: Use only in applications where rotation prevention is critical (e.g., rotating shafts).
- Material pairing: Match nut and bolt materials to prevent galvanic corrosion (e.g., stainless steel with stainless bolts).
- Reusability: Replace nuts with deformed slots or damaged threads to maintain safety.
Frequently Asked Questions
A: Normally, we make a 30% deposit after Pl confirmation and a 70% balance before shipment. lf order amountis too small, we can also change to 100% deposit in order to save bank handling charge.
A: A pre-bulk sample check can solve this problem to the largest extent. We will arrange production according to the pre-bulk sample quality standard after your confirmation of the samples.
A: We are not only a trading company but also a manufacturer. Our factory mainly focuses on mold design and quality inspection. Our bulk production may come from the factories we have worked with for a long time, and they are all ISO9001 certified. Through this cooperation model, we can not only ensure product quality and service, but also satisfy the diversified product needs of customers, and the price is more advantageous.
A: Yes,we are very glad to offer you samples.
However the express courier cost from our company to your required address will be upon your account.
Usually we use DHL, UPS, FEDEX or EMS as the courier.
It will take 3-7 days to arrive many Europe countries and North America.
Which express courier we will use, it’s up to your convenient or the express charge.
A: No,just part of our capable categories have been showed in our site.
If you are looking for relative industrial products, please feel free to contact us.
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