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.
Hex Coupling Nut
Hex Jam Nuts (Thick Hex Nuts): Overview
Material:
- Common materials: Carbon steel (Grade 8/10), 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 enhance corrosion resistance.
Manufacturing Process:
- Cold Heading: Forms the hexagonal shape and increased height from steel wire.
- Thread Rolling: Precision internal threading (metric/SAE) using dies for consistent pitch and depth.
- Heat Treatment: Quenching and tempering (for carbon/alloy steel) to achieve high tensile strength and hardness.
- Surface Finishing: Electroplating or coating to improve durability and environmental resistance.
Key Production Considerations:
- Height-to-width ratio: Ensures compatibility with standard wrenches and sufficient thread engagement.
- Thread concentricity: Critical for uniform load distribution and preventing cross-threading.
- Material integrity: Avoid internal voids or cracks during cold heading due to increased material volume.
- Coating uniformity: Prevents thread blockage and ensures smooth installation.
Applications:
- Heavy machinery: Secures high-stress bolted joints in engines, presses, and hydraulic systems.
- Structural steel: Bridges, building frameworks, and seismic retrofitting for enhanced load capacity.
- Railway/transport: Fastening tracks, bogies, and heavy-duty components under dynamic loads.
- Energy infrastructure: Wind turbines, oil rigs, and pipeline flanges requiring vibration resistance.
Installation:
- Tool selection: Use a wrench or socket matching the nut’s hex size (e.g., 19mm, ¾”).
- Thread alignment: Clean bolt threads and hand-tighten the nut to avoid misalignment.
- Torque application: Follow graded torque specifications (e.g., Grade 10 nut: higher torque) using a calibrated wrench.
- Double-nut method: Pair with a standard nut in high-vibration environments to prevent loosening.
- Inspection: Verify full thread engagement and check for deformation post-tightening.
Note:
- Load distribution: Thicker design reduces thread stripping risk under extreme tension.
- Material compatibility: Match nut grade to bolt strength (e.g., Grade 10 nut with Grade 10.9 bolt).
- Reuse limits: Discard nuts with worn threads or deformation to maintain joint integrity.
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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