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 Hex Nut
**Hex Slotted Nuts (Castellated Hex Nuts): Overview**
**Material**:
– **Common materials**:
– **Carbon steel**: Grade 8/10 (heat-treated for high tensile strength).
– **Stainless steel**: 304/316 (corrosion resistance in harsh environments).
– **Alloy steel**: ASTM A194 (for high-temperature/pressure applications).
– **Surface treatments**: Zinc plating, hot-dip galvanizing, Dacromet coating, or passivation (stainless steel) for corrosion and wear resistance.
**Manufacturing Process**:
1. **Cold Forging**: Forms the hexagonal shape and internal threads from steel wire.
2. **Slot Machining**: Precision milling or stamping of radial slots (castellations) around the nut’s circumference.
3. **Thread Rolling**: Cold-forming threads (metric/SAE) to enhance strength and fatigue resistance.
4. **Heat Treatment**: Quenching and tempering (for high-grade steel) to achieve hardness (HRC 22-35).
5. **Surface Finishing**: Electroplating or coating for environmental protection.
**Key Production Considerations**:
– **Slot alignment**: Uniform depth, spacing, and symmetry for proper cotter pin/wire insertion.
– **Thread concentricity**: Ensures compatibility with bolts and prevents cross-threading.
– **Material hardness**: Balances strength and ductility to avoid cracking during slot machining.
– **Coating uniformity**: Prevents flaking on slots or threads, ensuring corrosion resistance.
**Applications**:
– **Automotive**: Wheel hubs, axle assemblies, and suspension systems.
– **Heavy machinery**: Rotating shafts, gearboxes, and hydraulic systems.
– **Aerospace**: Landing gear, engine mounts, and flight control linkages.
– **Agriculture**: Tractor PTO shafts and tillage equipment.
– **Marine**: Propeller shafts and rigging components.
**Installation**:
1. **Thread engagement**: Tighten the nut onto the bolt until the slots align with the bolt’s pre-drilled hole.
2. **Cotter pin/wire insertion**: Insert a cotter pin or safety wire through the nut’s slot and bolt hole.
3. **Securing**: Bend the cotter pin ends or twist the wire to lock the nut in place.
4. **Torque control**: Follow manufacturer specifications to avoid overloading threads (e.g., 30–250 Nm for M12–M36 nuts).
5. **Inspection**: Verify the pin/wire is secure and the nut cannot rotate freely.
**Note**:
– **Safety compliance**: Use only in applications requiring rotation prevention (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, damaged threads, or coating degradation.
*Ideal for engineers and technicians requiring fail-safe, vibration-resistant fastening in dynamic or high-load mechanical systems.*
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**Key Terms**: Hex Slotted Nuts, Castellated Nuts, Cotter Pin Nuts, DIN 935, Vibration-Resistant Fasteners.
**Character Count**: Optimized for technical clarity and brevity.
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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