High-strength flat gasket

High-strength flat gasket — Manufacturer & Exporter

Qingdao ShengChenXiang Hardware Products Co., Ltd. is a specialized manufacturer of washer and sealing gasket based in Qingdao, China. With over 15 years of experience in precision metal fabrication, we supply custom washer and sealing gasket to distributors, engineering contractors and OEM buyers across Europe, North America, the Middle East and Southeast Asia. The high-strength flat gasket 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 washer and sealing gasket 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:

• 304/316 stainless steel

• C45/CK45 carbon steel

• alloy steel 40Cr

• brass H62

• PTFE virgin

• EPDM rubber

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 high-speed stamping, die cutting, and precision molding with material selection. 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:

• zinc plated

• black oxide

• phosphated

• passivated stainless

• natural PTFE white

Typical Applications

Our washer and sealing gasket are widely used in flange joints, bolted connections, valve seals, plumbing, automotive, oil & gas, HVAC, electrical panels. 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 & Assembly Notes

For best results, follow these general guidelines when installing our hardware components:

1. Check dimensions before installation — compare the delivered part against the drawing to confirm no shipping damage or manufacturing deviation.

2. Prepare the mating surface — clean oil, rust and burrs from the mating surface. A flat, clean seat ensures even load distribution.

3. Use correct fasteners — match bolt grade and size to the hole. Grade 8.8 bolts for carbon steel, A2-70 for stainless assemblies.

4. Torque in sequence — for multi-bolt joints, tighten in a crisscross pattern in 2–3 passes to achieve uniform clamping.

5. Inspect after load — after putting the assembly into service, re-check fastener tightness after 100 hours of operation.

How to Choose the Right Specification

When selecting hardware for your project, consider these key factors:

Material selection: Carbon steel Q235 is the default for most structural applications and is the most economical. Upgrade to Q355 where higher strength is needed. Stainless steel 304 suits food, marine and outdoor environments. Stainless 316 is for coastal, chemical or high-humidity service. Aluminum is for weight-sensitive applications.

Surface finish: Zinc plating (8–12 μm) provides indoor corrosion protection. Powder coating adds UV resistance and color options for outdoor use. Hot-dip galvanizing delivers 15–25 years of outdoor protection. Electropolished stainless is the hygienic choice for food and medical equipment.

Tolerance and precision: Standard ±0.2 mm is sufficient for most hardware. Where mating parts require precision, specify ±0.05 mm and we will machine to tighter tolerances.

Industries & Applications

Flanged Joints. Washers spread bolt preload across flanges, protecting gaskets and preventing galling on carbon and stainless studs.

Sealing Systems. Metal and PTFE washers combine with seals to manage thermal growth and maintain leak-tight joints under cycling.

Beyond these primary sectors, our High-strength flat gasket 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

(\'Carbon steel with hot-dip galvanizing is the cost-effective default for indoor and outdoor service, delivering 15-25 years of atmospheric protection. Where the part sits near the coast or in washdown areas, we recommend moving to 304 stainless. For chemical or high-chloride service, 316/316L is the safer alloy and is available on the same tooling.\', \'If your part is used indoors in a dry environment, electro-galvanizing (8-12 microns) is sufficient and keeps cost low. Outdoors, upgrade to hot-dip galvanizing or a duplex zinc-plus-powder system. For food, marine or pharmaceutical duty, electropolished stainless is the standard choice.\')

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

To quote, we need: part drawing or sample, annual quantity, target price, and delivery port. With those we respond within 24 hours with tooling cost (if any), unit price by quantity and lead time. First articles are inspected and approved before mass production.

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 is the maximum working load?
A: For the standard series the safe working load is documented per size. If your application exceeds the standard rating, we will upgrade the gauge or bolt spec at design stage.

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: Do you hold stock for urgent maintenance orders?
A: We keep a running stock of popular valve hardware sizes. For urgent needs, tell us the model and we will confirm availability within one working day.

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: Do you provide samples before mass production?
A: Yes. We produce first articles for your approval on all custom parts and can send physical samples for dimensional and material verification. Sample cost is credited against the production order.

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: Can you produce parts according to our samples?
A: Yes. Send us a physical sample and we will reverse-engineer it, produce a first article for your approval, and then move to mass production.

Q: Do you provide third-party inspection reports?
A: Yes. We can arrange SGS, BV or TUV inspection before shipment, at the buyer\'s expense.

Q: What is your payment terms for new customers?
A: T/T 30% deposit, 70% against copy of B/L. For orders over USD 20,000, L/C at sight is acceptable.

Q: Can you mix different products in one container?
A: Yes. We regularly consolidate multiple product lines from our catalog into a single shipment for distributors and trading companies.

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