Fasteners — Saudi Arabia

Fasteners Supplier Saudi Arabia — Bolts, Studs, Nuts & Washers In Stock

Gulf Union Ozone stocks a comprehensive range of industrial fasteners for oil & gas, petrochemical, infrastructure and general engineering projects across Saudi Arabia. Hex bolts, stud bolts, heavy hex nuts, flat and spring washers, anchor bolts and threaded rods — in carbon steel, alloy steel (ASTM A193 B7) and stainless steel 304/316. ISO 9001:2015 certified (CR 4030570569). Full MTC documentation. Same-day dispatch from our Jeddah warehouse to all KSA regions.

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Industrial fasteners — hex bolts, stud bolts, nuts and washers stocked in Jeddah Saudi Arabia
StandardsASME · ASTM · ISO · DIN · API
MaterialsCS · Alloy Steel · SS 304/316
Size RangeM6 to M100 / ¼″ to 4″
DispatchSame-day from Jeddah
QualityISO 9001:2015
Product Types

Product Types in Stock

Gulf Union Ozone carries six categories of industrial fasteners, covering bolt sets for ASME pressure flanges, structural connections, concrete anchoring and precision machinery assembly.

Type 01

Hex Bolts & Machine Bolts

Hexagonal-head fasteners in carbon steel grades ASTM A307, SAE Grade 5 and 8, metric ISO grades 8.8, 10.9 and 12.9, plus stainless steel A2-70 (SS 304) and A4-80 (SS 316). Size range M6 to M64 / ¼″ to 4″. Partial and fully threaded variants stocked. Hot-dip galvanised and zinc-plated finishes available. Widely used in piping supports, structural steel, pump bases and general equipment assembly throughout KSA oil and gas facilities.

Type 02

Stud Bolts & Double-End Studs

Pressure-rated stud bolts to ASME B16.5 in ASTM A193 B7 (Cr-Mo alloy, the primary ASME flange bolting material), B7M (NACE MR0175 sour-gas service), B8 (SS 304) and B8M (SS 316). Supplied as sets with heavy hex nuts to A194 2H, 2HM, Grade 8 or 8M as applicable. Lengths cut to flange class and size. UNC and metric threads. Double-end and tap-end studs for machinery and equipment housings also stocked in DIN 938 / DIN 976 grades.

Type 03

Nuts — Heavy Hex, Flange & Lock

Heavy hex nuts to ASTM A194 2H (for B7 stud bolts), A194 Grade 8 (SS 304) and A194 Grade 8M (SS 316). Standard metric hex nuts ISO 4032 / DIN 934 in grades 8 and 10. Serrated flange nuts DIN 6923 for anti-vibration connections. Nylon-insert lock nuts DIN 985 and all-metal prevailing-torque nuts DIN 980 for elevated-temperature locking. Coupling nuts DIN 6334 for threaded rod extension. Castle nuts for cotter-pin applications on rotating machinery shafts.

Type 04

Washers — Flat, Spring & Locking

Plain flat washers to ISO 7089 / DIN 125 and heavy structural washers to ASTM F436 for AISC-compliant structural bolted connections. Split spring lock washers DIN 127 in carbon steel and SS 316. Belleville disc springs DIN 2093 for high-load pre-load compensation in flanges and couplings. Nord-Lock wedge-locking washer pairs M8 to M36 for vibration-proof joints. Conical spring washers DIN 6796 for maintaining clamp load through thermal cycling on heat-exposed joints.

Type 05

Anchor Bolts & Foundation Fasteners

J-bolt and L-bolt cast-in-place anchor bolts to ASTM F1554 Grades 36, 55 and 105 for column base plates, vessel skirts and equipment pads. Available plain or hot-dip galvanised per ASTM A153. Headed anchor studs to ASTM F1554 Grade 105 alloy steel for high-load machinery anchoring. Post-installed wedge anchors and chemical anchor threaded rods in SS 316 for epoxy/resin injection concrete anchoring with ETA approval. Shear stud connectors to AWS D1.1 for steel-concrete composite construction.

Type 06

Threaded Rods, Socket Screws & Specialty

Full-thread rods to ASTM A36 / DIN 975 in M6–M100 up to 3 m, and high-strength B7 alloy rods for pressure equipment. Socket cap screws ISO 4762 / DIN 912 in grades 12.9 alloy steel and A4-80 stainless. Socket set screws DIN 913 for shaft-collar locking. Countersunk socket screws ISO 10642 for flush-mount tooling. Eye bolts DIN 580 for rigging, U-bolts for pipe clamp systems, carriage bolts ASME B18.5, T-head bolts DIN 186, dowel pins ISO 8734 and cotter pins ASME B18.8.1.

Product Catalog

Complete Fasteners Range — 60 Products

Representative stock lines. Contact us for specific sizes, finishes, certifications and project quantities. EN 10204 3.1 MTCs available on all items.

Product Standard / Spec Material Size Range Application
Hex Head Bolt — ASTM A307 Grade A ASME B18.2.1 / ASTM A307 Gr.A Carbon Steel (Plain / Zinc) ¼″ to 4″ × up to 24″ L General structural connections, pipe supports, equipment bases
Hex Head Bolt — SAE Grade 5 ASME B18.2.1 / SAE J429 Gr.5 Medium Carbon Steel (Zinc) ¼″ to 1½″ Automotive, machinery, general medium-strength engineering
Hex Head Bolt — SAE Grade 8 ASME B18.2.1 / SAE J429 Gr.8 Alloy Steel (Yellow Zinc) ¼″ to 1½″ High-strength industrial and heavy automotive connections
Heavy Hex Bolt — ASTM A325 ASTM F3125 / A325 Type 1 Medium Carbon Steel (Plain / HDG) ½″ to 1½″ Structural steel connections per AISC 360 / RCSC
Heavy Hex Bolt — ASTM A490 ASTM F3125 / A490 Type 1 Alloy Steel (Plain) ¾″ to 1½″ High-strength structural steel joints, bridge and building frames
Hex Bolt (Metric) — Grade 8.8 ISO 4014 / DIN 931 — Gr.8.8 Carbon Steel (Zinc Plated) M6 to M64 Machinery frames, equipment assembly, general engineering
Hex Bolt Fully Threaded — Grade 8.8 ISO 4017 / DIN 933 — Gr.8.8 Carbon Steel (Zinc Plated) M6 to M36 Through-bolt and tapped-hole fastening in machinery
Hex Bolt — Grade 10.9 DIN 931 — Gr.10.9 Alloy Steel (Zn-Ni Plated) M12 to M36 Heavy machinery, automotive structural, compressor casings
Hex Bolt — Grade 12.9 ISO 4014 — Gr.12.9 Alloy Steel (Black Oxide) M8 to M30 Ultra-high-strength precision machine and tooling connections
Hex Bolt — SS 304 (A2-70) ISO 4014 — A2-70 Stainless Steel 304 M6 to M36 Food-grade, HVAC, general corrosion-resistant connections
Hex Bolt — SS 316 (A4-80) ISO 4014 — A4-80 Stainless Steel 316 M6 to M36 Marine, chemical plant, offshore, seawater service
Hex Tap Bolt (Fully Threaded) — Grade 5 ASME B18.2.1 — SAE Gr.5 Carbon Steel ¼″ to 1¼″ Tapped holes in flanges, castings and equipment housings
Stud Bolt with 2 Heavy Hex Nuts — B7/2H ASME B16.5 / ASTM A193 B7 + A194 2H Alloy Steel Cr-Mo 4140 + Med. Carbon ½″ to 4″ ASME flanges Class 150 to 2500, pressure vessels, valves
Stud Bolt — B7M / 2HM (NACE Sour Service) ASTM A193 B7M + A194 2HM / NACE MR0175 Low-Alloy Steel (controlled hardness ≤22 HRC) ½″ to 2½″ Sour gas and H₂S service, NACE-compliant oil & gas facilities
Stud Bolt — B8 / Grade 8 (SS 304) ASTM A193 B8 + A194 Gr.8 Stainless Steel 304 ½″ to 2″ High-temperature pressure vessels and heat exchangers
Stud Bolt — B8M / Grade 8M (SS 316) ASTM A193 B8M + A194 Gr.8M Stainless Steel 316 ½″ to 2″ Corrosive-service flanges, chemical plant piping
Stud Bolt — B16 / Grade 7 (High Temp Steam) ASTM A193 B16 + A194 Gr.7 Cr-Mo-V Alloy Steel ¾″ to 2″ High-temperature steam service up to 540°C, refinery fired heaters
Double-End Stud — Grade 8.8 ASME B18.31.2 / ISO 888 — Gr.8.8 Carbon Steel M10 to M36 Engine, machine and equipment component mounting
Tap-End Stud (Short Thread) — DIN 938 DIN 938 — Gr.8.8 Carbon Steel M8 to M30 Tapped boss and housing connections in machinery
Full-Thread Stud Rod — DIN 976 DIN 976 — Gr.8.8 Carbon Steel M8 to M30 Adjustable assembly, spacer and positioning applications
Threaded Rod — ASTM A36 / DIN 975 Grade 4.8 ASTM A36 / DIN 975 — Gr.4.8 Carbon Steel (Plain / Zinc / HDG) M6 to M100 / ¼″ to 4″ (up to 3 m) Hanging, bracing, construction and general fastening
Threaded Rod — High-Strength A193 B7 ASTM A193 B7 Alloy Steel 4140 Cr-Mo M16 to M64 Pressure equipment structural anchoring, high-load suspensions
Threaded Rod — SS 316 (DIN 975) DIN 975 / ISO 888 Stainless Steel 316 M6 to M30 Corrosive environments, chemical plant, food processing
Cut-to-Size Threaded Rod — UNC / UNF ASME B1.1 Carbon Steel 1045 ¼″-20 UNC to 2″-4½ UNC Custom-length inch-thread fastening for equipment OEM supply
Heavy Hex Nut — ASTM A194 2H ASME B18.2.2 / ASTM A194 2H Medium Carbon Steel (Phosphate) ½″ to 4″ Paired with A193 B7 stud bolts on ASME pressure flanges
Heavy Hex Nut — ASTM A194 2HM (NACE) ASTM A194 2HM / NACE MR0175 Medium Carbon Steel (≤22 HRC, Phosphate) ½″ to 2½″ Sour gas / H₂S service with B7M stud bolts
Heavy Hex Nut — ASTM A194 Grade 8 (SS 304) ASME B18.2.2 / ASTM A194 Gr.8 Stainless Steel 304 ½″ to 2″ High-temperature pressure vessel service with B8 studs
Heavy Hex Nut — ASTM A194 Grade 8M (SS 316) ASME B18.2.2 / ASTM A194 Gr.8M Stainless Steel 316 ½″ to 2″ Corrosive and marine service flanges with B8M studs
Hex Nut (Metric) — Grade 8 ISO 4032 / DIN 934 — Gr.8 Carbon Steel Grade 8 (Zinc) M6 to M64 General machinery, structural and equipment assembly
Hex Nut (Metric) — Grade 10 ISO 4032 / DIN 934 — Gr.10 Alloy Steel Grade 10 M16 to M64 High-strength machinery and heavy equipment connections
Serrated Flange Nut — DIN 6923 DIN 6923 / ISO 4161 — Gr.8 Carbon Steel (Zinc Plated) M6 to M20 Anti-vibration connections, automotive, HVAC, compressor panels
Nyloc Lock Nut — DIN 985 DIN 985 / ISO 7042 Carbon Steel (Nylon Insert, Zinc) M6 to M36 Vibrating machinery and equipment where standard nut may loosen
All-Metal Prevailing Torque Lock Nut — DIN 980 DIN 980 / ASME B18.16.6 Alloy Steel / SS 316 (Zinc) M8 to M30 Elevated-temperature locking where nylon inserts are not suitable
Coupling Nut (Long Hex) — DIN 6334 DIN 6334 / ASME B18.2.2 Carbon Steel Grade 8 M8 to M36 Threaded rod extension and stud-to-stud connections
Castle Nut (Castellated) — DIN 935 ASME B18.2.2 / DIN 935 Carbon Steel ¼″ to 2″ / M10 to M30 Cotter-pin locking on rotating shafts and clevis pins
Plain Flat Washer — ISO 7089 / DIN 125 ISO 7089 / DIN 125-A Carbon Steel (Zinc Plated) M6 to M64 Load distribution under bolt head and nut in all assemblies
Structural Flat Washer — ASTM F436 Type 1 ASTM F436 Type 1 Medium Carbon Steel (Plain / Zinc / HDG) ½″ to 1½″ AISC structural steel bolted joints with A325 / A490 bolts
Fender Washer (Large OD) ASME B18.22.1 Carbon Steel (Zinc) M6 to M20 Soft materials, sheet metal and plastic panel fastening
Split Spring Lock Washer — DIN 127 DIN 127-B / ASME B18.21.1 Carbon Steel 65Mn (Zinc) M6 to M36 General anti-loosening in vibrating machinery and equipment
Split Spring Lock Washer — SS 316 DIN 127-B Stainless Steel 316 M6 to M24 Corrosion-resistant anti-loosening in marine and chemical service
Belleville Disc Spring Washer — DIN 2093 DIN 2093 Group 1 / Group 2 Spring Steel 51CrV4 10 mm to 100 mm OD High-load pre-load compensation in flanges and couplings
Nord-Lock Wedge-Locking Washer Pair NL8 to NL36 / NL System Hardened Carbon Steel / SS 316 M8 to M36 Vibration-proof bolted assemblies on heavy rotating equipment
Conical Spring Washer — DIN 6796 DIN 6796 Spring Steel (Zinc Phosphate) M6 to M30 Maintaining clamp load through thermal cycling on heat-exposed joints
J-Bolt Anchor — ASTM F1554 Grade 36 ASTM F1554 Grade 36 Carbon Steel (Plain / HDG per ASTM A153) ½″ to 2″ × up to 48″ L Column base plates, light equipment pads, light poles
L-Bolt Anchor — ASTM F1554 Grade 55 ASTM F1554 Grade 55 Carbon Steel (Plain / HDG) ¾″ to 2½″ Heavy equipment mounting pads and industrial foundation work
Headed Anchor Stud — ASTM F1554 Grade 105 ASTM F1554 Grade 105 Alloy Steel 4140 (Plain / HDG) 1″ to 3″ High-load machinery anchoring, vessel skirt and turbine bases
Post-Installed Wedge Anchor Bolt ICC-ES AC193 / ETA-approved Carbon Steel (Zinc) / SS 316 M10 to M30 × up to 450 mm Post-installed structural anchors in concrete (cracked / uncracked)
Chemical Anchor Threaded Rod (Epoxy / Resin) ETA-20/0541 / ASTM A36 SS 316 / Galvanised Carbon Steel M10 to M30 Epoxy injection concrete anchoring, refinery block walls
Shear Stud Connector AWS D1.1 / AASHTO M169 Carbon Steel 1015 (drawn arc) 13 mm to 25 mm dia × 65–150 mm Steel-to-concrete composite beams in industrial and bridge structures
Socket Cap Screw — Grade 12.9 ISO 4762 / DIN 912 — Gr.12.9 Alloy Steel (Black Oxide) M4 to M30 Precision machinery, tooling, jig and fixture assembly
Socket Cap Screw — SS 316 (A4-80) ISO 4762 — A4-80 Stainless Steel 316 M4 to M20 Corrosion-resistant precision applications, offshore instruments
Socket Set Screw (Flat Point) — DIN 913 ISO 4026 / DIN 913 — Gr.45H Carbon Steel (Black Oxide) M5 to M20 Shaft-collar and hub locking on rotating machinery shafts
Countersunk Socket Screw — DIN 7991 ISO 10642 / DIN 7991 — Gr.10.9 Alloy Steel (Black Oxide) M6 to M24 Flush-mount tooling plates, machine-tool tables, dies
Carriage Bolt (Round Head Square Neck) ASME B18.5 / ASTM A307 Carbon Steel (Zinc / HDG) ¼″ to 1¼″ × ¾″ to 6″ Timber-to-steel, composite wood connections, equipment guards
Eye Bolt (Collar Type) — DIN 580 DIN 580 / ASME B18.15 Carbon Steel (WLL-rated, Zinc / HDG) M8 to M36 Lifting, rigging and lashing points on equipment and structures
U-Bolt (Pipe Clamp) ASTM A36 (Pipe OD matched) Carbon Steel (HDG) DN15 to DN100 (½″ to 4″ pipe) Pipe clamp and conduit support systems in process plants
T-Head Bolt (T-Slot Bolt) — DIN 186 DIN 186 / ISO 8167 — Gr.8.8 Carbon Steel M8 to M30 Machine-tool T-slot table clamping, workholding fixtures
Cotter Pin — ASME B18.8.1 ASME B18.8.1 / DIN 94 Low Carbon Steel (Zinc) 1/16″ × 1″ to ⅜″ × 4″ Castle nut and clevis pin locking on shafts and linkages
Hardened Dowel Pin — ISO 8734 ISO 8734 / DIN 6325 Hardened Steel (58–65 HRC) 3 mm to 20 mm dia × 10–200 mm Precision alignment of machine components, die and mould tooling
Roll Pin / Spring Pin — DIN 1481 ISO 8750 / DIN 1481 Spring Steel (Phosphate) 3 mm to 16 mm dia × 10–100 mm Light-duty shear, retention and assembly positioning applications
Hex Flange Bolt — DIN 6921 DIN 6921 — Gr.8.8 Carbon Steel (Zinc Plated) M6 to M20 Automotive, compressor casing, pump body connections
Stud Bolt Set — Complete Flange Kit (B7 / 2H) ASME B16.5 / A193 B7 + A194 2H + F436 Alloy Steel + Medium Carbon Steel ¾″ to 2″ (Class 150 to 1500) Complete stud + 2 nut + washer sets packed per flange size
ASTM A307 Grade B Hex Bolt (Cast Iron Flanges) ASTM A307 Grade B / ASME B16.1 Low Carbon Steel ¼″ to 4″ Cast iron flanges per ASME B16.1 on water and utility services
Machine Screw Hex Head — DIN 933 Grade 8.8 DIN 933 — Gr.8.8 Carbon Steel (Zinc) M4 to M16 Instrument enclosures, panel assembly, terminal box covers
Hexagon Socket Button Head Screw — ISO 7380 ISO 7380 — Gr.10.9 Alloy Steel (Black Oxide) M5 to M16 Low-profile fastening on covers, guards and access panels
External Retaining Ring — DIN 471 DIN 471 / ASME B27.7 Spring Steel (Phosphate) 10 mm to 100 mm shaft dia Shaft axial retention of bearings, gears and collars
Internal Retaining Ring (Bore) — DIN 472 DIN 472 Spring Steel (Phosphate) 10 mm to 100 mm bore dia Bore retention of bearings and bushings in housings
Hex Head Bolt — Hot-Dip Galvanised (HDG) Grade 8.8 ISO 4014 / ASTM A153 Class C (HDG) Carbon Steel HDG (85 µm min coating) M12 to M36 Outdoor structural, walkways, pipe supports in corrosive environments
Foundation Bolt with Plate Washer & Nut ASTM F1554 Gr.36 / A563 Grade A Carbon Steel (Plain / HDG) ¾″ to 2″ × up to 60″ projection Pre-cast concrete foundation bolting for vessel skirts and steel frames
Specifications

Material Grades, Standards & Finishes

All fasteners are supplied with EN 10204 3.1 Material Test Certificates. Key grades and standards stocked at our Jeddah warehouse are listed below.

Bolt & Stud Material Grades

Grade Material Min. Tensile Temp. Range
A193 B7 Cr-Mo Alloy 4140 862 MPa (125 ksi) -45°C to 427°C
A193 B7M Cr-Mo (NACE ≤22 HRC) 724 MPa (105 ksi) -45°C to 427°C
A193 B8M SS 316 515 MPa (75 ksi) -196°C to 816°C
ISO 8.8 Carbon / Low-alloy Steel 800 MPa -50°C to 300°C
ISO 10.9 Alloy Steel 1040 MPa -50°C to 300°C
ISO 12.9 Alloy Steel 1220 MPa -50°C to 300°C
A2-70 (SS 304) Stainless Steel 304 700 MPa -196°C to 816°C
A4-80 (SS 316) Stainless Steel 316 800 MPa -196°C to 816°C

Surface Finishes & Coatings

Finish Standard Typical Use
Plain / Black As-processed Indoor, flange bolting (B7), structural
Zinc Electroplated ISO 4042 / ASTM B633 General engineering, mild corrosion protection
Hot-Dip Galvanised ASTM A153 / ISO 1461 Outdoor structural, anchor bolts, pipe supports
Phosphate (Black Phos.) MIL-DTL-16232 Stud bolts (B7 / B7M) with oil coating
Black Oxide MIL-DTL-13924 Socket screws, high-strength 12.9 fasteners
Zinc-Nickel (Zn-Ni) ISO 4520 / ASTM B841 Automotive and offshore Grade 10.9 / 12.9

Standards Compliance

ASME B16.5 ASME B18.2.1/2.2 ASTM A193 / A194 ASTM F1554 ASTM F3125 ISO 4014 / 4017 ISO 4032 / 7042 DIN 931 / 933 / 934 DIN 975 / 976 DIN 2093 NACE MR0175 AWS D1.1 EN 10204:2004 ISO 9001:2015
Why Us

Why Industrial Buyers in Saudi Arabia Choose Gulf Union Ozone

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Local Stock — Same-Day Dispatch

Our Jeddah warehouse maintains safety stock of the highest-turnover fastener grades — A193 B7/A194 2H stud bolt sets, ISO 8.8 hex bolts M6–M36, heavy hex nuts and flat washers — enabling same-day dispatch for in-stock items to all KSA regions without minimum order restrictions on urgent requirements.

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Documentation Ready to Ship

Every fastener order ships with EN 10204 3.1 Material Test Certificates (MTCs), Certificates of Conformance (CoCs), dimensional inspection reports and packing lists. For NACE MR0175 sour-service items (B7M / 2HM), we provide hardness test records and heat treatment certificates as part of the standard documentation package.

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ISO 9001:2015 Documented Quality

Gulf Union Ozone operates an ISO 9001:2015 certified quality management system (CR 4030570569). Incoming fastener lots are verified against MTC heat and lot numbers, and spot-checked for dimensional conformance and surface condition before release to stock. Traceability is maintained from mill certificate to delivery note.

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Nationwide KSA Delivery

We deliver fasteners to industrial customers and project sites across all 18 Saudi regions — Al Jubail, Yanbu, Ras Tanura, Riyadh, Dammam, Jizan, Tabuk, Abha and beyond. Freight-on-board (FOB) Jeddah or delivered-to-site options. Regular consolidation runs to Eastern Province and Yanbu Industrial City.

Related Products

Also Stocked at Gulf Union Ozone

Valves

Valves — Gate, Globe, Ball & Check

API 600 gate valves, API 602 compact gate, API 607 ball valves, globe and check valves in CS and SS for oil & gas piping systems. ASME Class 150 to 2500.
Pipe Fittings

Butt Weld & Socket Weld Fittings

ASME B16.9 butt weld elbows, tees, reducers and caps in ASTM A234 and A403. ASME B16.11 socket weld and threaded fittings. Carbon steel and stainless steel.
Flanges

ASME B16.5 Flanges — All Types

Weld neck, blind, slip-on, socket weld and threaded flanges in ASTM A105 carbon steel and ASTM A182 stainless. Class 150 through 2500. Stocked in Jeddah.
Capabilities

Project Supply & Documentation

MTO take-off, bulk project supply, MTC consolidation, kitting by PO line and expediting services. Supporting EPC contractors and owner-operators across KSA.
Get a Quote

Request a Fasteners Quotation

Send us your fastener schedule or MTO — specify grade (e.g. A193 B7), size, thread form (UNC / metric), finish and quantity. We will confirm stock availability and pricing within one business day. ASME flange bolt sets quoted per flange class, size and pressure rating. Stud bolt lengths cut to order.

Email Inquiry Submit RFQ Form

CR 4030570569 | ISO 9001:2015 | Jeddah, Saudi Arabia

Inventory updated: August 2026

In Summary

Gulf Union Ozone Trading Co. supplies Fasteners to industrial customers across Saudi Arabia with delivery from our Jeddah warehouse — all products ship with original certificates and compliance documentation for Aramco, SABIC, and government projects.

In Summary

Fasteners from Gulf Union Ozone serves Saudi Aramco operations, SABIC, SADARA, SEC utilities, NEOM mega-projects, and major industrial facilities across the Kingdom — our inventory covers the most common specifications, grades, and sizes.

In Summary

Gulf Union Ozone stocks a comprehensive range of Fasteners across various specifications and capacities — contact us for immediate availability confirmation and a competitive quotation with full documentation.

In Summary

For urgent Fasteners procurement in Saudi Arabia, WhatsApp +966 55 098 8062 — our team confirms stock availability within the hour and provides competitive quotations with full compliance documentation for all industrial sectors.