Fastening Solutions That Keep Infrastructure Moving.

CSG is ISO 9001:2015 certified and sources fasteners to ASTM, AREMA, EN and customer-specific standards. Certification and documentation requirements should be provided during the quoting process so the supply plan can be structured accordingly.

CSG can source self-locking nuts, prevailing-torque fasteners, wedge-locking systems, thread-locking compounds and other vibration-resistant technologies. The right solution depends on the joint design, vibration profile, service interval and specification requirements of the application.

Yes. CSG sources high-strength structural bolts, nuts, washers, bearing bolts, threaded rod and related connection hardware for bridge applications. Components can be sourced to ASTM, AASHTO or project-specific requirements with full lot traceability and material documentation.

Options may include hot-dip galvanized carbon steel, mechanically galvanized fasteners, zinc-flake coatings, stainless steel and weathering steel-compatible hardware. Material and finish selection should reflect the service environment, galvanic compatibility, required strength and expected maintenance cycle.

Yes. CSG can source track bolts, rail clips, tie plates, hook bolts, lag screws and related track fastening hardware. Sourcing is based on the customer specification, applicable standard and documentation requirements.

CSG supports full lot traceability including material certifications, heat lot tracking, inspection reports and test documentation. Traceability requirements should be defined at the quoting stage so the supply plan, supplier selection and documentation package are aligned before production.

Helpful information includes part number or drawing, dimensions, material, finish, quantity, annual usage, applicable standard or specification, traceability requirements, application environment and target delivery timing. If you do not have every detail, CSG can start with the information available and help identify what else is needed.

A490 bolts have a higher minimum tensile strength, 150 ksi, than A325 bolts at 120 ksi, so A490 is specified for heavier bridge connections. A325 is medium carbon steel and A490 is heat-treated alloy steel. Both are now covered by ASTM F3125. CSG supplies both grades with matching A563 nuts, F436 washers and 3.1 mill test reports.

No. ASTM F3125 does not allow hot-dip galvanizing on Grade A490 bolts because of the risk of hydrogen embrittlement. If the connection needs galvanizing, A325 bolts can be hot-dip galvanized, or the project specification may permit an approved zinc-flake coating on A490. BUMAX high-strength stainless bolts are another option where corrosion is severe.

Yes. CSG supplies structural bolts, nuts, washers and bridge hardware that are Buy America eligible for federally funded rail and bridge projects. Orders can ship with domestic sourcing documentation, 3.1 mill test reports and AASHTO paperwork. Tell us the funding source and specification at the quote stage so the right supply chain is planned from the start.

BUMAX 109 is a high-strength stainless steel bolt that pairs 10.9-grade strength with stainless corrosion resistance. It suits bridge girders, railway viaducts and coastal rail, where standard 304 and 316 stainless lack strength and carbon steel corrodes. CSG also supplies BUMAX 88 and BUMAX DX 129 duplex stainless, which offers 12.9-grade strength for the highest loads.

Tension control bolts, or TC bolts, have a splined end that twists off when the correct preload is reached. That gives consistent tension without a calibrated torque wrench and makes inspection quick, because a sheared spline shows the bolt was installed. CSG supplies TC bolts meeting ASTM F3125 for bridge girders, railway trusses and structural steel erection.

E-clips and SKL clips are elastic rail clips that hold the rail to the sleeper and keep a constant clamping force through millions of wheel passes. Their spring action resists loosening better than rigid fastenings. CSG supplies e-clips, SKL clips, spring clips and complete track fastening systems meeting EN 13481 and AREMA standards for freight, metro and light rail.

Fishplates and bolted rail joints use oval neck or square neck track bolts, which lock into the fishplate so the bolt cannot turn while the nut is tightened. They are designed for high clamping force and resistance to loosening under train passage. CSG stocks oval neck track bolts, square neck bolts and fishplate fasteners for joints, baseplates and turnouts.

A lockbolt is a two-piece fastener whose collar is swaged onto the pin, creating a permanent mechanical lock that cannot back out under vibration. Rail vehicles and track structures use lockbolts where loosening would mean repeated inspection or failure. CSG supplies lockbolts with hydraulic and pneumatic installation tooling, plus MRO support for maintenance crews in the field.

Signal and wayside enclosures need IP67 or IP68 sealing kits to keep out moisture and dust, plus grounding and bonding hardware such as bonding lugs and grounding clamps. EMI shielding strips protect sensitive electronics from interference. For cable routing, CSG stocks HellermannTyton UV-resistant cable ties and clamps for signaling, catenary supports and bridge lighting.