What are the available size options?

Standard sizes range from 25mm to 100mm or 1 inch to 4.00 inches.

Which industries can use this seal?

It is suitable for water treatment, food and beverage, petroleum, chemical, power plant, pharmaceutical, automotive, and marine industries.

What is the lead time for orders?

Peak season lead time is one month, while off-season lead time is within 15 workdays.

General Purpose Type 21 Mechanical Seal JohnCrane Type 21 Rubber Bellow Mechanical Seal

Name: General Purpose Type 21 Mechanical Seal JohnCrane Type 21 Rubber Bellow Mechanical Seal
Brand: SAISI SEAL CO., LTD
SKU: 2322686685

Jiangsu, ChinaSAISI SEAL CO., LTD

US$5.00-20.00

1 Piece

Product profile

Customization

Available

Structure

Single End

Pressure

High Pressure Mechanical Seals

Model NO.

Type 21

Speed

High-Speed Mechanical Seal

Temperature

Temperature Mechanical Seal

Performance

Wear

Standard

Standard, Nonstandard, OEM

Type

HU1

Balance

Balanced

Transport Package

Wooden Box or Carton Box Upon The Order

Specification

CE; RoHS

Trademark

Saisi Seal

Origin

Zhangjiagang, Jiangsu

Production Capacity

50, 000sets/Year

Key features

20+ Years Experience: Specialized in manufacturing high-quality mechanical seals for pumps and compressors.

OEM & Customization: Supports OEM, ODM, and full customization from samples or designs.

Wide Material Options: Materials include SSiC, RBSiC, alumina, TC, carbon, stainless steel, and elastomers.

100% Quality Inspection: Strict 100% visual and function inspection for all finished products.

Versatile Applications: Suitable for water treatment, petroleum, chemical, pharmaceutical, and marine industries.

Comprehensive Service: Provides seal repair, refurbishment, and re-engineering services.

High Performance: Designed for high pressure, high speed, and temperatures from -30 to 150 degrees Celsius.

Competitive Pricing: Offers best sealing solutions at competitive prices with immediate response.

Company profile

Importers and ExportersCooperated with Fortune 500Experienced TeamQuality Assurance

SAISI SEAL CO., LTD

Jiangsu, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 8 Years CertifiedNearest Port: Shanghai PortAverage Response Time: ≤2.07h

AI-Powered supplier vetting

SummaryThe supplier operates in valves, couplings, metal structural components, instruments, electrical components, and related import/export activities. It reports broad customization services, ODM capability, OEM service for well-known brands, 3D software design, and professional technical supplier status. Export experience is stated as eight years, with self-operated import/export rights and one-month average lead times in both peak and off-season. However, the supplier reports no new products in the past year, no patents, no private molds, no overseas service facilities or agents, and no ERP, OA, CRM, or SAP systems. Service procedures exist for corrective actions and complaints, but written records are absent. Financial information is inconsistent and insufficiently interpretable, so financial credibility cannot be confirmed.

Supplier typeThe stated business scope covers valves, couplings, metal structural components, instruments, and electrical components, while the supplier identifies itself as a professional technical supplier. This supports classification as an industrial component and technical-product supplier, but the slices do not establish a narrower legal or manufacturing classification.

R&D capabilityThe supplier offers ODM and 3D software design services, but reports no new products in the past year, zero R&D patents, no private molds, no available SDK, and no ERP, OA, CRM, or SAP systems. These findings show some design capability but limited evidence of sustained or system-supported innovation.

Production capacityFinished-product inspection instructions are available and uniformly followed. The supplier has self-operated import/export rights, eight years of export experience, and reports one-month average lead times in both peak and off-season; however, direct production capacity details such as equipment, output, or facility scale are not provided.

Customization capabilityThe supplier explicitly provides customization from samples, designs, full customization, minor customization, and flexible customization. It also offers ODM services and 3D software design, giving clear evidence of broad customization support.

Client casesThe supplier states that it provides OEM services for well-known brands, which is evidence of at least one type of customer experience. No brand names, project details, quantities, or independently verifiable case information are provided.