Bolts & Screws
Hex bolts, hex screws, socket screws and special machined fasteners manufactured to DIN, ISO, ASTM or customer drawings.
DUPLEX & SUPER DUPLEX FASTENERS
Duplex & Super Duplex Stainless Steel Fasteners
EST Metal supplies duplex and super duplex stainless steel bolts, nuts, studs, washers and custom fasteners for demanding corrosive environments. Common material grades include 2205 / UNS S31803 / S32205 and 2507 / UNS S32750, with S32760 available according to project requirements.
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DUPLEX FASTENERS
PRODUCT RANGE
Duplex Fasteners for Corrosive Service
Standard and made-to-drawing fasteners for chemical processing, offshore, marine, oil & gas and other corrosion-critical applications.
Nuts
Hex nuts and special nuts in duplex and super duplex stainless steel for corrosion-resistant bolted assemblies.
Studs & Stud Bolts
Fully threaded studs, double-end studs and stud bolts supplied to project dimensions and specification requirements.
Washers & Custom Parts
Flat washers and made-to-drawing components for industrial fastening systems and engineered assemblies.
MATERIAL GRADES
2205 & 2507 Duplex Stainless Steel
Material selection is supplied according to the purchase specification, drawing and service requirements.
01
Duplex 2205
UNS S31803 / UNS S32205. Widely specified for chloride-containing and industrial corrosive environments.
02
Super Duplex 2507
UNS S32750. Selected for more severe chloride-bearing and high-corrosion service conditions.
03
UNS S32760
Super duplex material available for project-specific requirements subject to size, quantity and specification.
04
Custom Requirements
Other duplex specifications, dimensions, threads and drawing-based configurations can be reviewed for quotation.
STANDARDS & SUPPLY
Specification-Based Fastener Supply
Orders can be reviewed against applicable ASTM, DIN and ISO requirements together with customer drawings and technical documents.
ASTM Requirements
Material and fastener requirements are reviewed according to the ASTM specification stated on the inquiry or purchase order.
DIN Fasteners
Metric bolts, screws, nuts, studs and washers can be supplied to specified DIN dimensions where applicable.
ISO Fasteners
ISO dimensional requirements and customer-specific thread or dimensional requirements can be reviewed.
Custom Drawing Parts
Non-standard duplex fasteners and machined parts can be manufactured according to customer drawings.
QUALITY DOCUMENTATION
Material Traceability & Inspection
Documentation requirements should be stated with the RFQ so they can be reviewed before quotation and production.
01
Mill Test Report
Mill Test Report (MTR) and material certificates can be supplied according to order requirements.
02
Material Traceability
Heat and material identification can be maintained according to agreed project and inspection requirements.
03
Dimensional Inspection
Dimensions, threads and drawing requirements are checked according to the applicable order specification.
04
Project Documentation
Additional inspection or documentation requirements can be reviewed before order confirmation.
APPLICATIONS
Built for Demanding Corrosive Environments
Oil & Gas
Fastening components for process equipment, piping systems and corrosion-critical oil and gas applications.
Chemical Processing
Duplex fasteners for equipment exposed to aggressive process environments and corrosive media.
Marine & Offshore
Duplex and super duplex fasteners for seawater, marine and offshore service environments.
Industrial Equipment
Custom fastening solutions for pumps, valves, pressure equipment and engineered industrial assemblies.
SEND YOUR REQUIREMENT
Request a Duplex Fastener Quote
Include grade, product type, standard, diameter, length, thread, quantity and drawing or technical specification where available.