Double Ended Stud Suppliers in KSA | Stainless steel high-grade stud bolts

Double Ended Stud Suppliers in KSA | High-grade Stud Bolts in Stainless Steel

Find double ended stud suppliers and manufacturers in Saudi Arabia offering double ended studs, stud bolts, tap-end studs, full threaded studs and threaded rods in carbon steel, mild steel, EN-19, ASTM A193 B7, B7M and B16 alloy steel, SS 304 A193 B8, SS 316 A193 B8M, duplex, super duplex, aluminium bronze and Inconel. Compare sizes from M8 to M48 and 1/2 inch to 4 inch, thread types, heavy hex nut pairings, coatings, indicative SAR prices and supplier contacts in Al Khobar, Dammam, Jubail and Riyadh for flange, valve, pump, pressure vessel, oil, gas and petrochemical bolting.

How to Select a Double Ended Stud in Saudi Arabia

Before Choosing a Double Ended Stud Bolt

✓ Stud Type: Double ended stud (equal threads both ends, plain shank in the middle), tap-end stud (short thread screws into a tapped hole, long thread takes the nut), full threaded stud (continuous thread for flange bolting) or double ended stud with flange or hex collar (a fixed collar that acts as a stop or wrenching point).

✓ Material Grade: Carbon steel (A307, A354), mild steel, EN-19 (42CrMo4 type), A193 B7, B7M and B16 alloy steel, A193 B8 and B8M stainless, duplex and super duplex, aluminium bronze and Inconel. The service conditions, not price, should decide the grade.

✓ Size & Length: Metric M8–M48 or inch 1/2–4 inch. For flange studs, length is based on flange thickness, gasket, nut height and the thread projection required by the specification.

✓ Thread Type: Metric coarse (for example M20 × 2.5), metric fine, UNC for inch sizes up to 1 inch, and 8UN (8 threads per inch) for flange studs 1 inch and above, as used in ASME B16.5 flange bolting.

✓ Nuts & Washers: Pair each stud with the matching nut grade: B7 with A194 2H, B7M with 2HM, B8 with A194 8 and B8M with A194 8M heavy hex nuts.

✓ Coating: Plain or black oxide for indoor use; hot-dip galvanizing, zinc or PTFE/fluoropolymer (Xylan-type) coating for outdoor, coastal and offshore service in the Gulf.

✓ Certification: Ask for mill test certificates to EN 10204 3.1 (or 3.2 with third-party inspection) and heat-number traceability, which oil and gas operators in the Kingdom expect.

✓ Service Conditions: Temperature, pressure, sour gas (H₂S), seawater or chloride exposure and chemical contact all change the right grade.

✓ Benefits: Easy Assembly on Tapped Holes • Even Clamping Force on Flanges • Reusable • Replaceable Without Damaging Equipment • Wide Choice of Grades

✓ Buyer’s Tip: Give suppliers the full description: stud type, grade, diameter, thread, length, nut grade, coating and certificate level. Missing any one of these is the most common cause of wrong or rejected stud bolt deliveries.

Match Your Job to the Right Double Ended Stud Before You Read Anything Else

Top Double-Ended Stud and Fastener Suppliers in Saudi Arabia

Also in the Eastern Province: Saudi Bea Fasteners Manufacturing, a joint venture between BEA of Italy and the Shoaibi Group in Dammam Second Industrial City, has been reported as producing B7, B7M, B8, B8M, L7, L7M and B16 stud bolts from 1/2 inch diameter; and Metal Fasteners Manufacturing Co. on King Saud Street, Dammam, lists stud bolts, anchor bolts and threaded bars. Confirm current capabilities directly.

Double Ended Stud Types: Which Stud Bolt Do You Actually Need?

Double ended studs differ in thread layout, grade and service. Each type below explains what it is, typical specifications, where it fits and what to check before ordering in Saudi Arabia.

Double Ended Stud Bolt For Flange Connections And Piping

Why are double ended stud bolts used for flange connections and piping?
A flange joint needs even clamping force all the way around the gasket. A stud bolt passes through both flanges with a heavy hex nut on each end, so both nuts can be tightened and the load is shared evenly. Most pipe flange studs are fully threaded with chamfered ends, though double ended studs with a plain shank are also used.

• How It Works: The stud is inserted through matching bolt holes; two nuts are tightened in a cross pattern to a set torque or tension.
• Typical Specifications: ASTM A193 B7 studs with A194 2H nuts; UNC up to 1 inch and 8UN above; lengths set by flange class and size under ASME B16.5.
• Best For: Pipe flanges, valve and equipment nozzles across refineries, water plants and industrial piping.
• Buying Tip for KSA: Specify coating for outdoor coastal sites; PTFE-coated B7 studs are common in the Eastern Province to prevent seizure and corrosion.

Available From: Al-Rashed Fasteners (Al-Rashed Group): +966 13 853 2299  |  DTC Arabia (Dar Taia Co.): +966 53 452 7910

Double Ended Stud For Valve And Pump Assembly

What type of stud bolt is used for valves and pumps?
Valves and pumps use studs to hold bonnets, covers and casings, where one end often screws into a tapped hole in the body. Double ended and tap-end studs let the cover be removed repeatedly for maintenance without wearing out the threads in the casting.

• How It Works: One end is screwed permanently into the body; the cover goes over the studs and is secured with nuts.
• Typical Specifications: B7 or B16 for high-temperature valves; B8/B8M or duplex for corrosive fluids; M10–M36 and 1/2–1-1/2 inch.
• Best For: Valve bonnets, pump casings, compressor heads and gearbox covers.
• Buying Tip for KSA: Match the stud grade to the valve’s pressure and temperature class and check the tapped-hole thread before ordering.

Available From: UCON Bolts KSA: +966 57 285 1392  |  United Eagle Trading Company (Boltec): +966 53 766 8500

Tap-End Stud Bolt For Machinery And Equipment Housings

What is a tap-end stud and when is it used in machinery?
A tap-end stud has a short thread on one end that screws into a tapped hole and a longer thread on the other end for the nut. Standards such as DIN 938 (engagement about 1 × d, for steel), DIN 939 (about 1.25 × d, for cast iron) and DIN 940 (about 2.5 × d, for light alloys) set the tap-end length for different housing materials.

• How It Works: The tap end is screwed into the housing and stays there; the nut end clamps the cover or part.
• Typical Specifications: Metric M6–M36, property classes 5.6 or 8.8, stainless A2/A4 options.
• Best For: Engine blocks, gearboxes, motor housings, machine frames and cylinder heads.
• Buying Tip for KSA: Choose the DIN standard according to the housing material; a steel-length tap end in aluminium can strip the thread.

Available From: United Eagle Trading Company (Boltec): +966 53 766 8500

Full-Length Threaded Stud For Industrial Mechanical Fastening

What is a full-length threaded stud and how is it different from a double ended stud?
A full-length threaded stud is threaded along its entire length, while a double ended stud has threads only at each end with a plain shank in the middle. Full threaded studs, such as DIN 976 threaded rod, can be cut to any length and accept nuts anywhere along the rod, which makes them versatile for mechanical fastening, supports and flange bolting.

• How It Works: Nuts are positioned wherever needed; for flange bolting, a heavy hex nut is used at each end.
• Typical Specifications: DIN 976 metric rod in 4.8, 8.8, A2 and A4; B7 full threaded stud bolts with heavy hex nuts for flanges.
• Best For: Pipe supports, hangers, machine mounting, flange bolting and general construction.
• Buying Tip for KSA: For pressure flanges, buy certified A193 grade full threaded stud bolts, not general-purpose threaded rod.

Available From: United Eagle Trading Company (Boltec): +966 53 766 8500  |  Al-Rashed Fasteners (Al-Rashed Group): +966 13 853 2299

Double Ended Stud Bolt For Pressure Vessel And Pipeline Applications

Are double ended stud bolts used in pressure vessels and pipelines?
Yes. Pressure vessel manways, nozzles, heat exchanger channels and pipeline flanges rely on stud bolts because studs can be tensioned accurately and replaced without damaging the vessel. Grades and sizes are chosen under the design code, for example ASME Section VIII for vessels and ASME B16.5 or B16.47 for flanges.

• How It Works: Studs are tightened by calibrated torque wrenches or hydraulic tensioners to a controlled bolt load.
• Typical Specifications: A193 B7 or B16, and A320 L7 for low temperatures; 3/4–4 inch; 8UN threads.
• Best For: Manways, nozzles, heat exchanger flanges, pig launchers and pipeline flanges.
• Buying Tip for KSA: Order with EN 10204 3.1 certificates and consider controlled tensioning services for critical joints.

Available From: Al-Rashed Fasteners (Al-Rashed Group): +966 13 853 2299  |  DTC Arabia (Dar Taia Co.): +966 53 452 7910

B7 Double Ended Stud Bolt For High-Temperature Piping Systems

What is an ASTM A193 B7 double ended stud bolt and why is it the most common flange stud?
ASTM A193 B7 is a quenched and tempered chromium-molybdenum alloy steel (AISI 4140/4142 type) with a minimum tensile strength of 125 ksi (about 860 MPa) and yield of 105 ksi (about 720 MPa) for diameters up to 2-1/2 inch. Its strength and temperature resistance make it the default stud for refinery, petrochemical and power piping.

• Typical Specifications: 1/2–4 inch or M12–M100; paired with A194 2H heavy hex nuts; plain, zinc, HDG or PTFE coated.
• Temperature Range: Commonly used from about −29°C to around 450°C; above that, B16 is often specified.
• Best For: Pipe flanges, valves and equipment in hydrocarbon, steam and utility service.
• Buying Tip for KSA: B7 is not suitable for sour service; if H₂S is present, switch to B7M with 2HM nuts.

Available From: Al-Rashed Fasteners (Al-Rashed Group): +966 13 853 2299  |  UCON Bolts KSA: +966 57 285 1392

B7M Double Ended Stud Bolt For Sour Gas Service

What is a B7M stud bolt and why is it used for sour gas service?
B7M is the same alloy as B7 but tempered to a lower hardness, maximum 235 HBW (about 22 HRC), with minimum tensile strength of 100 ksi (about 690 MPa). The lower hardness resists sulphide stress cracking in wet H₂S environments, meeting NACE MR0175 / ISO 15156 requirements used across Saudi gas facilities.

• Typical Specifications: Every stud hardness-tested; paired with A194 2HM nuts; often PTFE coated.
• Best For: Sour gas plants, wellheads, gas processing and any H₂S-containing line.
• Design Note: Because B7M is weaker than B7, joints designed for B7 may need re-checking for bolt load.
• Buying Tip for KSA: Ask for hardness test records and NACE compliance statements on the mill certificate.

Available From: UCON Bolts KSA: +966 57 285 1392  |  Al-Rashed Fasteners (Al-Rashed Group): +966 13 853 2299

Stainless Steel Double Ended Stud Bolt For Corrosive Environments

Should I choose SS 304 A193 B8 or SS 316 A193 B8M double ended studs?
SS 304 A193 B8 double ended studs resist general corrosion and suit water, food and mild chemical service. SS 316 A193 B8M double ended studs add molybdenum for better resistance to chlorides and pitting, making them the better choice for coastal, marine and chemical plants in the Gulf. Class 1 (solution annealed) is softer; Class 2 (strain hardened) is stronger.

• Typical Specifications: B8 with A194 Grade 8 nuts; B8M with A194 Grade 8M nuts; M5–M48 and 1/4–2 inch.
• Small Sizes: Small stainless studs such as M5 × 130 mm 304 double ended threaded rod packs and 75 mm stainless double ended studs are common for instruments and light equipment.
• Best For: Water treatment, food and beverage, pharmaceutical plants, coastal structures and chemical lines.
• Buying Tip for KSA: Apply anti-seize to stainless studs to prevent galling, and avoid mixing stainless studs with carbon steel nuts.

Available From: Zabar Global (DAR TAIA Fasteners)  |  UCON Bolts KSA: +966 57 285 1392

Duplex Steel Double Ended Stud Bolt For Seawater And Offshore Applications

Why choose duplex or super duplex stud bolts for seawater and offshore work?
Duplex stainless steel (UNS S31803/S32205, grade 2205) combines austenite and ferrite, giving roughly twice the strength of 316 and much better resistance to chloride stress corrosion cracking. Super duplex (UNS S32750 and S32760) goes further for hot seawater and aggressive chemicals, which matters in Saudi desalination plants and offshore platforms.

• Typical Specifications: Duplex 2205 and super duplex studs with matching nuts; M12–M48 and 1/2–3 inch.
• Best For: Seawater intakes, desalination plants, offshore platforms, firewater systems and chloride-rich process lines.
• Alternatives: Aluminium bronze double ended studs are also used in marine and seawater service for their corrosion resistance and non-sparking properties.
• Buying Tip for KSA: Specify ferrite content and PREN requirements where your project standard calls for them.

Available From: UCON Bolts KSA: +966 57 285 1392

High-Strength Alloy Steel Double Ended Stud For Industrial Equipment

Which high-tensile stud bolts are used for heavy industrial equipment?
High-tensile stud bolts in grades such as B7, B16, EN-19 (42CrMo4 type), property class 10.9 and A354 BD carry high loads in machinery, presses, turbines and heavy equipment. EN-19 double ended studs are popular in general engineering for their good strength-to-cost ratio.

• Typical Specifications: EN-19 and 42CrMo4 hardened and tempered; A193 B16 (Cr-Mo-V) for high-temperature steam and turbines; A354 BD for high-strength structural use.
• Best For: Turbines, compressors, presses, cement and steel plant machinery and heavy equipment frames.
• High-Temperature Option: A193 B16 is commonly used for steam and process piping at temperatures above B7’s usual range.
• Buying Tip for KSA: For high-strength grades, ask for hardness and tensile test results with the certificate.

Available From: Al-Rashed Fasteners (Al-Rashed Group): +966 13 853 2299  |  United Eagle Trading Company (Boltec): +966 53 766 8500

Double Ended Stud Products Available in KSA

• ASTM A193 B7 Double Ended Stud Bolt: Alloy-steel stud used for industrial flange and piping connections where high-strength bolting is required.
• ASTM A193 B7M Double Ended Stud Bolt: Lower-strength, hardness-controlled stud specified for sour-service applications where NACE requirements apply.
• SS 304 A193 B8 Double Ended Studs: Stainless-steel studs for corrosion-resistant industrial and process applications.
• SS 316 A193 B8M Double Ended Studs: 316 stainless-steel studs for more demanding corrosive and chloride environments.
• Duplex 2205 Double Ended Stud Bolt: Duplex stainless-steel stud for seawater, desalination, offshore and chloride-exposure applications.
• Super Duplex Double Ended Stud Bolt: High-corrosion-resistance stud for demanding offshore, marine and chemical applications.
• DIN 938 Double Ended Stud: Stud with different thread lengths on each end, suitable for machinery and equipment housing connections.
• DIN 976 Double Ended Stud / Threaded Rod: Threaded stud and rod configuration used for mechanical fastening and equipment assembly.
• A193 B16 Double Ended Stud Bolt: Alloy-steel stud intended for high-temperature steam and process-piping applications.
• Inconel Double Ended Stud Bolt: Nickel-alloy stud (Inconel 625 or 718) for specialised high-temperature and corrosive environments.
• Aluminium Bronze Double Ended Studs: Copper-alloy studs for seawater, marine and non-sparking applications.

Popular Double Ended Stud Listings and Indicative Prices

Prices are indicative and depend on grade, diameter, length, coating, certificate level and quantity. Always request a written quotation.

Double Ended Stud Size and Material Table

Double-Ended Stud Material Grade Table

Stud Bolts Size Chart, Dimensions and Thread Types

How is a stud bolt measured? Diameter is the nominal thread size. For flange stud bolts, length is usually measured from first full thread to first full thread, excluding the chamfered points. The heavy hex nut across-flats size for inch studs follows the formula 1.5 × diameter + 1/8 inch.

Thread types: Metric coarse (ISO) is standard for metric studs; metric fine is used where finer adjustment or vibration resistance is needed; UNC and 8UN (ASME B1.1) are standard for inch flange studs; BSW is still found on some older British-built equipment. Always confirm thread type when replacing studs in existing equipment.

Custom Mechanical Fasteners for Oil, Gas and Petrochemical Industries

Saudi oil, gas and petrochemical projects often need studs beyond standard catalogue items: special lengths, reduced-shank studs, double ended studs with flange or hex collars, hex double ended bolts, special coatings and exotic alloys. Local manufacturers such as Al-Rashed Fasteners and UCON Bolts KSA produce to drawings, while Boltec makes custom anchor bolts.

• Quality-Assured Stud Bolts: Look for ISO 9001 certified manufacturing, EN 10204 3.1/3.2 certificates, heat-number traceability, hardness testing and, for critical service, third-party inspection.
• Operator Requirements: Saudi Aramco, SABIC and other operators maintain approved vendor lists and material standards; confirm your supplier’s approval status for the product type you are buying.
• Coatings for the Gulf Climate: PTFE/fluoropolymer and hot-dip galvanizing protect studs against salt air, humidity and sand on coastal and outdoor sites.
• Anchor Bolt Manufacturer in Saudi Arabia: For foundations, Al-Rashed Fasteners, Boltec and Metal Fasteners Manufacturing Co. produce J-, L- and straight anchor bolts that can be ordered alongside stud bolts.

Double Ended Stud Brands Offered by KSA Suppliers

Frequently Asked Questions