Full-thread or double-ended forms
Product formFasteners
/ 01 — TECHNICAL OVERVIEW
Stud Bolts
Industrial stud bolts are threaded fasteners used with two compatible nuts to secure flanged joints, valves, pressure equipment and other bolted assemblies. A complete specification defines the material or strength grade, dimensional and product standards, thread form, nominal diameter, pitch, stud length, thread configuration, condition, finish and compatible nuts.
NESCO Pipe & Tubes supplies stud bolts for pressure piping, petrochemical, power, marine, heat-exchanger, pressure-equipment and maintenance applications, individually or as complete stud-and-nut assemblies.
Heat or lot traceability, Mill Test Certificates, mechanical and hardness testing, PMI, dimensional and thread inspection, finish verification, matched-set identification and export documentation can be coordinated where specified.
How it is made
01
Certified bar is straightened and cut to the specified overall stud length.
02
Threads are rolled or cut to the required form, pitch and engagement.
03
Heat treatment, coating or lubrication is applied according to the bolting specification.
04
Thread gauges, length, hardness, mechanical properties, nut compatibility and marking are inspected.
Request reviewed quotation Material documents on request
/ 02 — PRODUCT DETAIL
Built around the specification.
Industrial stud bolts are threaded fasteners used with two compatible nuts to secure flanged joints, valves, pressure equipment and other bolted assemblies. A complete specification defines the material or strength grade, dimensional and product standards, thread form, nominal diameter, pitch, stud length, thread configuration, condition, finish and compatible nuts.
Key features01 02 03 04
Cut to specified overall length
Matched nut sets
Coating and lubricant options subject to service
Common specification references
STD
ASTM A193, A320 or A453 as applicable
STD
ASTM A194 or compatible nut specifications
STD
ASME B16.5 – Applicable flange dimensions and bolting requirements for flanged joints.
Explore the fasteners range
/ 03 — AVAILABLE GRADES
Available Material Grades
NESCO supplies the material and bolting families shown below, subject to fastener type, grade, dimensions, thread, condition, finish and availability.
Material familyCommon gradesTypical selection context
Alloy SteelASTM A193 Grade B7 and B16
Flanged joints, valves, pressure equipment and elevated-temperature service
Stainless SteelASTM A193 Grade B8 and B8M
Corrosion-resistant flanged joints, valves and equipment
Low-Temperature Alloy SteelASTM A320 Grade L7
Low-temperature pressure piping and equipment
Special High-Temperature BoltingASTM A453 applicable grades
Special high-temperature applications requiring controlled thermal expansion characteristics
Nickel-Alloy Stud BoltsSelected grades such as UNS N06625, N07718, N08825 and N10276, where specified
Severe-corrosion, high-strength and elevated-temperature applications
/ 04 — SUPPLY & CUSTOMISATION
Define the supply condition.
Final availability depends on the complete combination of material, dimensions, standard, condition, testing and quantity.
ParameterTypical information to specify
01Thread system
Metric, UNC, UNF, 8UN or specified form
02Dimensions
Diameter, pitch, length and thread engagement
03Condition
Solution annealed, heat treated or cold worked as specified
04Finish
Plain, passivated, coated, plated or lubricated subject to compatibility
05Sets
Bolt/nut/washer or stud with two nuts
06Testing
Chemical, mechanical, hardness, PMI and coating tests as required
07Marking
Grade, manufacturer and heat/lot identification
/ 05 — DIMENSIONS & SIZE RANGE
Dimensions aligned to the manufacturing route.
A complete stud-bolt description combines the material grade, applicable dimensional standard, nominal diameter, length and specified thread designation.
Ordering itemExamplesRequired detailAcceptance / control
ThreadMetric, UNC, UNF, 8UN or specified thread formNominal diameter, pitch/series, thread class and thread lengthThread gauge and dimensional verification
DiameterSpecified nominal diameterNominal diameter and applicable toleranceDiameter measurement
LengthOverall stud lengthLength convention and specified toleranceLength measurement
Thread configurationContinuous thread, double-end or flange bolting studThreaded length, unthreaded portion and thread run-out where applicableDimensional and visual verification
FinishPlain, coated, plated or lubricated where specifiedFinish/coating system and applicable requirementsVisual and finish/coating verification
/ 06 — MANUFACTURING STANDARDS
Standards aligned for every order.
The material standard, dimensional standard and project requirements should be stated separately.
ReferenceWhat it coversRole
ASTM A193/A193MAlloy-steel and stainless-steel bolting for high-temperature or high-pressure service and other special-purpose applications, including studs and stud bolts
Pressure, high-temperature and special-purpose stud bolts
ASTM A320/A320MAlloy-steel and stainless-steel bolting for low-temperature service, including studs and stud bolts
Low-temperature stud bolts
ASTM A453/A453MHigh-temperature bolting materials with expansion coefficients comparable to austenitic stainless steels, including studs and stud bolts
Special high-temperature service
ASTM F593Stainless-steel bolts, hex cap screws and studs for applications requiring general corrosion resistance
General stainless-steel stud bolts
ASME B18.31.2Dimensions and general data for continuous-thread studs, double-end studs and flange bolting studs
Stud dimensions
Applicable nut specificationRequirements for nuts compatible with the specified stud-bolt grade and service
Mating nuts
ASTM A962/A962MCommon requirements for bolting components used with applicable ASTM bolting specifications
General bolting requirements
Project / OEM specificationCoating, lubrication, supplementary testing, marking and other joint-specific requirements
Project-specific requirements
/ 07 — INSPECTION & TESTING
Evidence before dispatch.
01Heat or lot traceability and MTC review
02Diameter, pitch, length and GO/NO-GO thread-gauge inspection
03Head, nut, bearing-face and chamfer dimensions
04Hardness, tensile, yield, proof-load or impact testing as required by the specification
05PMI for stainless and alloy verification when specified
06Coating thickness and lubricant verification where ordered
07Grade marking, nut compatibility and matched-set checks
08Quantity, segregation and protective packing verification before dispatch
PACKAGING & MARKING
Protected and traceable.
01Bolting segregated by grade, heat/lot, size and finish
02Matched stud-and-nut sets bagged or boxed when ordered
03Threads protected from impact and contamination
04Moisture-resistant export cartons and timber cases
05Labels show standard, grade, thread, length, quantity and PO
/ 08 — APPLICATIONS & INDUSTRIES
Engineered for demanding service environments.
From process plants to marine systems, NESCO coordinates material, dimensions and documentation around the operating conditions of each application.
01
Flanged piping joints02
Pressure vessels03
Valves and pumps
04
Chemical and marine equipment05
Structural assemblies06
Heat exchangers
07
Power plants08
Maintenance and shutdownsIndustries servedOne supply partner across critical sectors.
Pressure pipingOil & gasPetrochemicalsPower generationMarineStructural fabricationHeat exchangersMaintenance shutdowns
/ 09 — WHY NESCO PIPE & TUBES
Built for buyers who cannot leave details to chance.
From specification review to export documentation, NESCO coordinates the technical and commercial details as one complete supply requirement.
01
Specification control
NESCO reviews the grade, product standard, dimensions, condition and acceptance criteria as one coordinated requirement.
02
Multi-material sourcing
Stainless steel, duplex and nickel-alloy fastener requirements can be combined within one project enquiry.
03
Traceable documentation
Heat numbers, MTCs and agreed inspection records are aligned with the purchase order before dispatch.
04
Inspection coordination
PMI, dimensional checks, NDT and third-party witnessing can be arranged against an approved inspection plan.
05
Value-added processing
Cutting, machining, thread-related requirements, coating, lubrication or protective finishing can be reviewed with the fastener specification.
06
Export-ready packing
Identification, surface protection and packing are planned around product geometry and the final transport route.
07
Responsive RFQ review
Technical and commercial inputs are consolidated early so queries are resolved before quotation and production.
08
One accountable supply desk
NESCO provides a single contact for material, processing, documentation, packing and delivery coordination.
/ 10 — FREQUENTLY ASKED QUESTIONS
Clear answers before you specify.
Quick guidance on product selection, standards, dimensions, inspection and documentation. For project-specific requirements, NESCO will review the complete enquiry with your team.
01How is stud-bolt length measured?
Measurement depends on the specified configuration and dimensional convention. State the required overall length and reference standard explicitly.
02Are two nuts included with each stud?
Studs can be supplied alone or as sets with two compatible nuts and washers where specified.
03What information is essential for fastener quotation?
Provide fastener type, material/strength grade, dimensional standard, diameter, pitch, length, finish, nut/washer requirement, quantity and certificates.
04Can stainless and alloy bolting grades be interchanged?
No. Strength, temperature capability, corrosion behaviour and matching nut requirements differ; substitutions require approval from the responsible engineer.
05Why must coating and lubricant be stated?
Surface condition influences corrosion protection, friction and tightening load. It must be compatible with the service and assembly procedure.
06Can fasteners be supplied as matched sets?
Bolts, studs, nuts and washers can be packaged as coordinated sets when grades, quantities and marking requirements are specified.
/ 11 — REQUEST FOR QUOTATION Nesco direct sales desk
Ready to source?Start with the details you already have.
Our team will review the grade, dimensions, testing and delivery requirements together.