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Exploded view of a stainless bolt, washer and flange nut assembly
100% Stainless, Built to Last

Reliable Fasteners. Built Around Your Requirements.

Stainless steel fasteners and solar mounting components for industrial buyers, distributors and project suppliers worldwide. One material promise, zero compromise: we make stainless only.

DIN & ISO StandardsA2 / A4 StainlessCustom FastenersSolar Mounting Components
Stainless mounting hardware on a solar rail at a PV plant
Solar & Clean Energy

Stainless Fastening for Solar & Clean Energy

T-nuts, flange nuts, bolt + washer assemblies and rail clamps for PV mounting — built for coastal salt spray, high wind loads and a 25-year service life.

T-Nuts & Flange NutsRail ClampsCoastal Salt Spray25-Year Service LifeRooftop · Ground · Tracker
Quality inspection of stainless fasteners before packing and shipment
From Selection to Delivery

Your Fastener Sourcing Journey, Supported

One team from first drawing to final shipment — datasheets, EN 10204 3.1 evidence and OEM sampling at every step.

  • 01Selection
  • 02Datasheet
  • 03Quality Evidence
  • 04Sample / OEM
  • 05Quote
  • 06Production
5M+Pcs / Month
150+Team Members
12,000㎡Production Base
19Years in Stainless
DIN 933ISO 4014ISO 3506 A4-80ANSI/ASME B18.2.1DIN 934EN 10204 3.1DUPLEX 2205ASTM A193 B8ISO 4017NORSOK M-650 DIN 933ISO 4014ISO 3506 A4-80ANSI/ASME B18.2.1DIN 934EN 10204 3.1DUPLEX 2205ASTM A193 B8ISO 4017NORSOK M-650
Product Finder

Find the right fastener in four clicks.

Stop browsing category trees. Filter by what actually matters — material, standard and application.

What We Supply

One supplier for standard & custom fasteners

All services
Standard stainless fasteners

Standard Fasteners

High-volume DIN / ISO / ANSI stainless bolts, screws, nuts and washers — stable supply, fast delivery, full size range from M3 to M100.

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Custom fasteners on engineering drawing

Custom Fasteners

Manufactured to your drawings, samples or technical requirements — special alloys, non-standard dimensions, prototype to volume.

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Quality inspection and documentation

Quality & Documentation

EN 10204 3.1 mill certificates, mechanical test reports and full traceability — audit-ready documentation with every shipment.

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Solar mounting solutions

Solar Mounting Solutions

Solar mounting components and PV installation kits — rails, roof hooks, clamps and fasteners supplied as complete project sets.

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DIN 933 / 912DIN 7505M2.5–M24A2 / A4 / SUS410
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Capability in Motion

Precision in every thread

Cold heading, thread rolling and CNC machining under one roof — the full stainless family from self-tapping screws to double-thread rods, in DIN, ISO and ASME/ANSI inch series.

  • Full DIN & ASME/ANSI familySelf-tapping, machine screws, socket & set screws, nuts, washers and double-thread rods — M2.5 to M24.
  • Tested on our own floorRockwell & Vickers hardness, tensile testing and salt-spray corrosion machines in-house.
  • A2 / A4 / SUS410 stainlessEvery part in stainless only — with inch-series equivalents for the US market.
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Bilateral point-of-use inventory systems
Supply Programs

Point-of-use inventory. Zero line-down moments.

Vending machines, bin stores and kitted solar projects — delivered, replenished and tracked, so fasteners are never the reason your line stops.

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Engineer examining a stainless steel fastener
Services

When "off the shelf" isn't enough

Custom cold-formed specials, corrosion-grade selection and supply programs engineered around your production line — not a catalog page.

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Bilateral engineers walking the warehouse
Experts

Ideas to move your business forward

Material, application and logistics engineers who work alongside you — from design review to the last container. You don't have to know everything.

Meet the expert teams
Material Mastery

One ladder of alloys. Zero shortcuts.

Corrosion resistance is a budget decision. We help you buy exactly the grade the environment demands — no more, no less.

304
A2 · 1.4301
Corrosion resistance

Indoor, food equipment, general industrial fastening.

316 / 316L
A4 · 1.4404
Corrosion resistance

Coastal, chemical and marine atmospheres. Our volume grade.

2205
Duplex · 1.4462
Corrosion resistance

Chloride-rich service, offshore platforms, desalination.

2507
Super Duplex · 1.4410
Corrosion resistance

Seawater cooling, subsea, aggressive process lines.

Ni-Alloys
Incoloy 925 · Inconel 800
Corrosion & heat

Sour service (NACE), high-temperature reactors, specialty chemical.

What's In It For You

Six reasons buyers switch to Bilateral

Lower total cost of corrosion

Lower total cost of corrosion

Right-grade stainless eliminates warranty claims, rework and replacements — the hidden 80% of fastener cost.

Certificates you can verify

Certificates you can verify

EN 10204 3.1 with heat numbers, spectrometer reports and salt-spray data attached to every shipment — not on request, by default.

Lead times you can plan

Lead times you can plan around

5M pcs monthly capacity and buffer stock on A2/A4 standard sizes keep your line and your projects moving.

One supplier, whole BOM

One supplier, whole BOM

Bolts, nuts, washers, T-bolts and solar kitting consolidated into fewer containers, fewer POs and one responsible partner.

Stainless-only focus

Stainless-only focus

We don't make carbon steel. Every furnace, tool and inspection protocol is tuned for one thing — doing stainless right.

Engineering answers in hours

Engineering answers in hours

Material selection, torque tables and drawing feedback from engineers — usually within one working day, in English.

Where We Fasten

Built for the toughest environments

All applications
Solar & Photovoltaic

Solar & Photovoltaic

Roof hooks, mounting rails, T-bolts and clamps engineered for decades of outdoor service.
Industrial Equipment

Industrial Equipment

Stainless fasteners for machinery, automation lines and MRO programs.
Construction & Infrastructure

Construction & Infrastructure

Structural stainless for curtain walls, bridges and public projects.
Global Reach

One supply base, 40+ markets served

40+Export markets
19Years of manufacturing
5M+Pcs monthly capacity
BILATERAL
Drag to rotate · Orange dot = Suzhou HQ
150+Alloy specifications
12,000㎡Production base
24hQuotation response
Knowledge Hub

Proof, not promises

The downloads procurement actually forwards to their engineers.

Featured White Paper

How to Verify an EN 10204 3.1 Material Certificate

The 7-point checklist procurement teams use to catch 304-passing-as-316 — heat numbers, spectrometer matches and what a fake 3.1 looks like.

Get the White Paper — Free PDF
Selection Guide

316 vs 316L vs Duplex 2205 for Coastal Projects

PREN values, cost per joint and when paying more actually saves money.

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Success Story

Solar Kitting Program for a Brazilian EPC

2,400 sets per month, one consolidated shipment, zero missing parts in 14 months.

Read story
Newsroom

Latest from the factory floor

All news
Bilateral news

New Solar Mounting Fastener Line Enters Mass Production

T-bolts, mid/end clamps and grounding washers now kitted per project with single-part traceability.

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Bilateral news

Duplex 2205 & 2507 Buffer Stock Expanded for Offshore Clients

Standard stud and nut sizes now ship from stock within 7 days, with 3.1 certificates.

Read more
Bilateral news

Meet Us at Feicon Batimat São Paulo — Hall 3, Stand 42

Live salt-spray samples and the full duplex range on display. Book a meeting with our LATAM team.

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Have a Fastener BOM or Drawing?

Send us your specifications for product review and quotation — material advice, lead time and documentation terms within 24 hours.

Request a Quote WhatsApp: +86 134 5155 6833

Upload your BOM, technical drawing or product specifications. Helpful details: product name, standard & size · material, finish & quantity · target market · PDF / CAD drawings · email, company, phone or WhatsApp.