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.
Shoulder Bolt
Countersunk Dowel Bolts (Shoulder Bolts with Anti-Rotation Features): Overview
Material:
- Common materials:
- Carbon steel: Grade 8.8/10.9 (heat-treated for high strength).
- Stainless steel: 304/316 (corrosion resistance in harsh environments).
- Alloy steel: 4140/4340 (for high-stress, high-temperature applications).
- Surface treatments: Zinc plating, Dacromet coating, black oxide, or electropolishing (stainless steel) for wear and corrosion resistance.
Manufacturing Process:
- Cold Heading: Forms the countersunk head and partially threaded shank.
- Shoulder Machining: CNC turning/grinding to create a precision dowel pin (shoulder) with tight tolerances (±0.02mm).
- Thread Rolling: Cold-formed threads (metric/SAE) for high fatigue resistance.
- Heat Treatment: Quenching and tempering (for carbon/alloy steel) to achieve target hardness (HRC 25-40).
- Surface Finishing: Coating or polishing for corrosion protection and reduced friction.
Key Production Considerations:
- Countersunk angle: Standard 90° or 100° angles to match DIN 7991/ISO 10642 specifications.
- Dowel shoulder precision: Diameter and concentricity must align with mating components to prevent misalignment.
- Material hardness: Balance strength and machinability to avoid cracking during shoulder machining.
- Surface finish: Smooth shoulder surface to minimize wear in dynamic assemblies.
Applications:
- Precision machinery: Securing gears, pulleys, and bearings in CNC equipment or robotics.
- Mold/die systems: Alignment of injection molds and stamping dies.
- Automotive: Transmission shafts, throttle linkages, and suspension components.
- Aerospace: Flight control systems and engine mounts requiring anti-rotation.
- Electronics: Precision fixtures for PCB assembly or optical devices.
Installation:
- Pre-drill holes: Drill a countersunk hole matching the bolt head angle and a clearance hole for the dowel shoulder.
- Alignment: Insert the dowel shoulder into the pre-machined slot or hole to prevent rotation.
- Thread engagement: Hand-tighten the bolt to ensure proper alignment before final torque.
- Torque application: Use a torque wrench to tighten to manufacturer specifications (e.g., 20–150 Nm for M8–M20 bolts).
- Inspection: Verify flush seating of the countersunk head and zero rotational play in the dowel joint.
Note:
- Load direction: Designed for axial loads; avoid excessive lateral forces on the dowel shoulder.
- Corrosion management: Match coating to environmental conditions (e.g., Dacromet for outdoor use).
- Reusability: Replace bolts with worn shoulders or damaged threads to maintain precision.
Ideal for engineers and technicians requiring vibration-resistant, non-rotational fastening in high-precision mechanical systems.
Key Terms: Countersunk Dowel Bolts, Shoulder Bolts, Anti-Rotation Fasteners, DIN 7991, Precision Alignment.
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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