Double-bolt clamp

Double-bolt clamp — Manufacturer & Exporter

Qingdao ShengChenXiang Hardware Products Co., Ltd. is a specialized manufacturer of pipe clamp and clamping hardware based in Qingdao, China. With over 15 years of experience in precision metal fabrication, we supply custom pipe clamp and clamping hardware to distributors, engineering contractors and OEM buyers across Europe, North America, the Middle East and Southeast Asia. The double-bolt clamp shown on this page represents one of our standard or semi-custom product lines. We can produce it exactly as specified on the drawing, or modify dimensions, materials and finishes to match your project requirements.

Why the Right Part Matters

Whether you are specifying components for a new build or replacing parts in the field, the right pipe clamp and clamping hardware directly affects installation speed, long-term reliability and total lifecycle cost. A poorly made part may crack under load, corrode in service, or require re-work during assembly. Our engineering team reviews every drawing for manufacturability before quoting, and each production batch runs through first-article inspection, in-process checks and a final QC pass before packing.

Materials We Use

We select the base material based on your service environment, load rating and budget. Standard options include:

• Q235 mild steel

• Q355 low-alloy high-strength steel

• 304/316 stainless steel

• ductile iron QT450

• 65Mn spring steel

For outdoor or corrosive environments, we typically recommend hot-dip galvanized carbon steel for cost-effective protection, or 304/316 stainless steel where maximum corrosion resistance is required. Tell us your working temperature, media and exposure conditions and our engineers will recommend the optimal material grade.

Manufacturing Process

Our production line combines precision stamping, deep drawing, and robotic MIG/TIG welding. Each step is controlled by dedicated technicians:

• Material cutting — laser, shearing or blanking to size with tight tolerances

• Forming — stamping, bending or deep drawing on hydraulic presses up to 200 tons

• Welding — MIG, TIG or spot welding by certified welders, with robotic options for high-volume orders

• Machining — CNC turning, milling or drilling where precision features are required

• Surface treatment — done in-house or through audited partner facilities

• Assembly & packing — sub-assembly, labeling and export packing per customer request

Surface Treatment Options

Corrosion protection is selected to match the service environment. Available finishes include:

• hot-dip galvanized (ISO 1461)

• electro-zinc plated 8-12 μm

• powder coated RAL colors

• PVC dip coating

• natural/black oxide

Typical Applications

Our pipe clamp and clamping hardware are widely used in power transmission, telecom cable, fire protection, HVAC, sewage, photovoltaic mounting, oil & gas pipeline. If your application is not listed, contact us — we regularly adapt standard parts for custom installations.

Customization & OEM

We welcome OEM and ODM orders. Send us your drawing, sample or a rough sketch with key dimensions, and our engineering team will confirm feasibility within 24 hours. Common customization requests include:

• Custom dimensions, hole patterns and thread sizes

• Logo engraving, laser marking or custom labels

• Special packaging (individual polybag, export carton, pallet)

• Mixed-container orders across multiple product lines

Why Source From Qingdao ShengChenXiang?

• In-house tooling — we design and build our own stamping dies, which keeps tooling cost low and lead time short.

• Two factories — 1,300 m² existing production floor plus a new 1,500 m² facility coming online by end of 2026.

• One-stop service — stamping, welding, machining, rubber/plastic over-molding and surface treatment under one roof.

• Strategic location — near Qingdao Port and Tianjin Port, reducing inland freight and export lead time.

• Small MOQ friendly — we accept trial orders and mixed containers for new distributors.

Packaging & Lead Time

Standard packing is inner polybag + export carton + wooden pallet. For delicate parts we use foam or dividers to prevent scratching. Typical lead time is 15–25 days after deposit and drawing confirmation, depending on order volume and tooling requirements. We can ship by sea (LCL/FCL), air or express courier to your nearest port.

Technical Specifications

Installation Guide

Proper installation of pipe clamps is critical to long-term system performance. Follow these steps:

1. Verify pipe OD — measure the actual outside diameter of the pipe, not the nominal size. Wall thickness and manufacturing tolerances can shift the OD by several millimeters.

2. Check the support spacing — for horizontal piping, standard spacing is 1.5–3 meters depending on pipe size and content weight. Vertical runs typically require a support every 2–4 meters.

3. Position the clamp — place the saddle under the pipe so the bolt holes align freely. Do not force the clamp into position; this pre-stresses the band and leads to premature fatigue.

4. Torque the bolts evenly — tighten diagonally in two passes. For M10 bolts on 2 mm band, target torque is 8–12 N·m. Over-tightening deforms the pipe wall.

5. Add insulation liner if needed — for cold or hot piping, insert an EPDM or rubber liner between the clamp and pipe to prevent thermal bridging and galvanic corrosion.

6. Final inspection — after pressurizing the system, check each clamp for movement. Tighten any that have shifted.

How to Select the Right Clamp

Choosing the correct clamp involves matching four factors: pipe size, load, environment and budget.

By environment: For outdoor power and telecom lines, hot-dip galvanized Q235 is the standard choice — it delivers 15–25 years of service in atmospheric conditions. For coastal or coastal-industrial atmospheres, upgrade to 304 stainless steel or a duplex (zinc + powder coat) system. For buried or submerged service, use 316 stainless or epoxy-coated carbon steel with a scratch-resistant topcoat.

By load: Light-duty clamps (1.5 mm band, M8 bolts) suit thin-wall conduit and small-bore tubing. Medium-duty (2–3 mm, M10–M12) covers most HVAC and fire-protection piping. Heavy-duty (4 mm+, M16, double-bolt) is required for large-diameter steel, HDPE or ductile-iron mains where wind load and thermal movement are significant.

By budget: Carbon steel with HDG is the most cost-effective for bulk installations. Stainless steel costs 3–5 times more but eliminates replacement costs over a 20-year horizon. For one-time projects where maintenance access is easy, carbon steel is adequate.

Industries & Applications

Oil & Gas. Piping skids and wellhead facilities use corrosion-resistant clamp systems that survive washdown, chemical exposure and high ambient temperatures.

Power & Utility. Overhead power transmission lines, substation busbars and telecom tower cable routes rely on reliable pipe and cable clamps to hold conductors securely through wind load and thermal cycling.

Beyond these primary sectors, our Double-bolt clamp is widely specified in maintenance retrofit projects, OEM new-build programmes and export distribution. Because we manufacture in-house, we can adapt the design — hole patterns, thickness, finish or packaging — to the exact requirements of each project without minimum-order penalties.

Customers typically choose us because we combine stamping, forming, welding and surface treatment under one roof, so drawings become production parts quickly with a single point of responsibility.

Material & Surface Finish

(\'We stock Q235 and Q355 carbon steel plus 304, 316 and 316L stainless as standard. Aluminium is available for weight-critical designs. Material certificates (MTC) are issued with every batch, and we can arrange third-party mill verification if your project specification requires it.\', \'The right grade depends on three questions: is the part load-bearing, is it outdoors, and does it contact food, water or chemicals? Answer those and we will match grade, gauge and finish in the quotation, with alternatives priced for comparison.\')

Packing & Delivery

We pack in export-grade cartons or wooden crates depending on part weight, with individual protection for finished surfaces. Small parts are bagged and boxed with printed labels if required. For urgent projects, air freight is handled within 48 hours of production completion.

Ordering & Customisation

Customisation is a normal part of our workflow: dimensions, hole patterns, materials, finishes and packaging can all be adapted. Send a sketch or drawing and our engineers will confirm manufacturability, suggest cost improvements and issue a fixed quotation.

Product-Specific FAQ

Q: Can this part be supplied in stainless steel?
A: Yes, the same design can be produced in 304 or 316 stainless. Please specify the grade and environment when ordering so we can recommend the right alloy.

Q: What load rating can the heavy-duty version take?
A: Load capacity depends on thickness and bolt size. For the heavy-duty line we typically engineer for 2-3x the load of the standard series; send your working load and we will confirm with calculations.

Q: What surface treatment options are available?
A: Options include electro-galvanizing, hot-dip galvanizing, powder coating, passivation and electropolishing. We match the finish to your environment and budget.

Q: Can you match my existing hole pattern or bolt spacing?
A: Yes. Send a drawing or sample and we will reproduce the hole pattern exactly. Custom bolt spacing is free for orders above our MOQ.

Q: What are your MOQ and trial-order terms?
A: Standard MOQ is 50-100 pieces depending on size, but trial orders below MOQ are welcome at a small surcharge to cover setup. We keep your tooling on file for repeat orders at full production pricing.

Q: Can you supply parts with our logo or markings?
A: Yes. Logo, part number and barcode can be stamped, laser-marked or printed on the part and packaging for OEM programmes, at no extra charge above MOQ.

Frequently Asked Questions

Q: What is your minimum order quantity?
A: For standard catalog items, MOQ is typically 50–100 pieces. For custom parts, MOQ depends on tooling complexity — contact us with your drawing for a firm quote.

Q: Can you produce according to our drawings or samples?
A: Yes. We work from customer drawings (PDF/DWG/STEP) or physical samples. Our engineering team reverse-engineers samples and produces a first article for approval before mass production.

Q: What is your payment terms?
A: T/T 30% deposit, 70% balance against copy of B/L. For first orders we also accept L/C at sight for amounts above USD 20,000.

Q: Do you provide material certificates?
A: Yes. We can provide mill test certificates (EN 10204 3.1) for steel materials, and RoHS/REACH declarations on request.

Q: How do you control quality?
A: We run first-article inspection after tooling setup, in-process checks every 2 hours, and a final random inspection (AQL 2.5) before packing. We can also arrange third-party inspection (SGS, BV) at customer request.

Q: What is the difference between a single-bolt and double-bolt clamp?
A: A single-bolt clamp grips from one side only and suits light, small-bore piping. A double-bolt clamp distributes load on two sides, reducing point stress on the pipe wall and handling larger diameters and higher vibration loads.

Q: Can you supply clamps with EPDM rubber liners?
A: Yes. We can insert bonded EPDM or NBR liners to dampen vibration, prevent galvanic corrosion between dissimilar metals, and reduce noise in HVAC and plumbing systems.

Q: How do you package for export?
A: Standard packing is inner polybag + export carton + wooden pallet. For container shipments we can load pallets directly. Special packing (individual boxes, labeling with your logo) is available on request.

Q: What is the typical lead time for a custom clamp?
A: For existing tooling, 7–15 days. For new tooling (custom dimensions), 25–35 days including die design, sampling and first-article approval.

Contact us today: +86 18031716800 (WhatsApp/WeChat) | 1687610863@qq.com | No. 378, Tuanjie Road, Huangdao District, Qingdao, Shandong, China