Fasteners

Industrial Bolts, Nuts & Fasteners

Bolts, nuts, screws, studs, washers and anchors in stainless, alloy, high-nickel and non-ferrous metals — to ASTM, ASME, ISO and DIN standards.

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Industrial fasteners — bolts, nuts and washers
ASTM A193 / A194ISO 898-1
Bolts, Nuts & StudsStandard and special fasteners
6 TypesBolts · Nuts · Screws · Studs · Washers · Anchors
ASTM · ISO · DINStandard specifications
MTCEN 10204 3.1 / 3.2
Heat No.Marked and traceable
Overview

Fasteners Matched to Your Joint

A joint is only as good as its weakest bolt. Grade, property class and coating must suit the load, temperature and environment.

We supply fasteners in stainless steel, carbon and alloy steel, high-nickel alloys and non-ferrous metals. They are ordered by standard, grade or property class, size and finish, and are supplied with certificates traceable to the heat or lot.

If you are bolting flanges or pressure equipment, tell us the flange class and service and we will help match the stud bolt and nut grades.

  • Stud bolts, hex bolts & screws
  • Matching nuts and washers
  • ASTM, ISO and DIN standards
  • Special sizes on request
Product Range

Six Fastener Families

Most joints need a bolt, a nut and a washer — but the right type depends on the application.

01

Bolts

Hex head and heavy hex bolts for structural and general use, with a nut.

Best for · Structural and general joints
02

Nuts

Hex, heavy hex, lock and flange nuts to match the bolt or stud grade.

Best for · Joints with studs or bolts
03

Screws

Socket head cap, set and machine screws for equipment and machinery.

Best for · Machinery and assemblies
04

Studs & Stud Bolts

Threaded on both ends or fully threaded. Standard for flanged joints.

Best for · Flanges and pressure equipment
05

Washers

Flat, spring and lock washers to spread load and prevent loosening.

Best for · Under nuts and bolt heads
06

Anchors

Expansion and chemical anchors to fix to concrete and masonry.

Best for · Fixing to concrete
Specifications

Common Specifications We Supply Against

Governing standards for each material family. Tell us the one on your purchase order.

Material / ProductSpecificationTypical GradesNotes
Alloy & stainless stud boltsASTM A193 / ASME SA193B7 · B7M · B16 · B8 · B8MFor high-temperature and pressure service
Nuts for pressure serviceASTM A194 / ASME SA1942H · 2HM · 4 · 7 · 8 · 8MMatches A193 studs
Low-temperature boltingASTM A320L7 · L7M · B8 · B8MImpact tested for low temperature
Stainless bolts, screws & studsASTM F593304 · 316 · 321General corrosion service
Stainless nutsASTM F594304 · 316Matches F593 bolts
Carbon steel boltsASTM A307Grade A · Grade BGeneral-purpose, low strength
Structural boltsASTM F3125Grade A325 · A490High-strength structural joints
Metric property-class boltsISO 898-14.6 · 8.8 · 10.9 · 12.9Carbon and alloy steel
Metric stainless fastenersISO 3506-1A2-70 · A4-70 · A4-80304 and 316 family

Dimensions: ASME B18.2.1 / B18.2.2, DIN 933 / 931 (hex bolts), DIN 934 (hex nuts), DIN 912 (socket head cap screws), DIN 125 (washers), DIN 975 (threaded rod). Availability depends on size and grade.

  • Grades we supply:
  • SS 304 / 316
  • A2-70 / A4-80
  • B7 / B7M studs
  • 2H / 2HM nuts
  • B8 / B8M
  • Grade 8.8 / 10.9 / 12.9
  • Duplex 2205
  • Inconel 625
  • Monel 400
  • Titanium Gr 2
  • Brass
  • Hot-dip Galvanised
Property Class

Strength Grades at a Glance

Minimum strength for common metric property classes.

Values per ISO 898-1 and ISO 3506-1; yield shown as 0.2% proof stress for stainless. Always check the full standard for your size.

Property classMaterialMin. tensileMin. yield
8.8Medium carbon steel, quenched & tempered800 MPa640 MPa
10.9Alloy steel, quenched & tempered1000 MPa900 MPa
12.9Alloy steel, quenched & tempered1200 MPa1080 MPa
A2-70Stainless steel, 304 family700 MPa450 MPa
A4-70Stainless steel, 316 family700 MPa450 MPa
A4-80Stainless steel, 316 family800 MPa600 MPa
Applications

Where Fasteners Are Used

The industries that most often specify this product.

  • 01Oil & Gas
  • 02Chemical & Process
  • 03Power
  • 04Marine
  • 05Construction
  • 06Food & Pharma
  • 07Automotive
  • 08Machinery
Enquiry Checklist

Six Details Make a Complete Enquiry

Send these with your request and we can quote without going back and forth.

  1. 1

    Fastener type

    Bolt, nut, screw, stud, washer or anchor.

  2. 2

    Standard & grade

    For example ASTM A193 B7 with A194 2H, or A4-80.

  3. 3

    Size

    Diameter, thread pitch and length, metric or imperial.

  4. 4

    Finish & coating

    Plain, passivated, zinc plated, hot-dip galvanised or PTFE coated.

  5. 5

    Quantity

    Number of pieces or sets, including nuts and washers.

  6. 6

    Documents & testing

    MTC 3.1 or 3.2, hardness or third-party inspection.

Certificates & Testing With Every Order

Mill test certificates to EN 10204 3.1 / 3.2, PMI, hydro and NDT testing, and third-party inspection can be arranged. Read how every order is checked.

Quality Policy
FAQ

Fasteners: Common Questions

Still have a question?

Our team can help you choose the right grade, size and specification.

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B7 is the grade of a chrome-molybdenum alloy steel stud under ASTM A193, quenched and tempered for high-temperature and high-pressure service. It is normally paired with grade 2H nuts under ASTM A194.

A2 fasteners are made from 304-type stainless steel and A4 from 316-type, which contains molybdenum for better resistance to chlorides and acids. The number after the dash — 70 or 80 — is the property class, showing the minimum tensile strength.

They are ISO 898-1 property classes. The first number × 100 gives the minimum tensile strength in MPa (8.8 = 800 MPa); the second number as a decimal fraction of the first gives the yield ratio. Higher numbers mean stronger bolts.

Yes — fasteners are supplied with certificates traceable to the heat or lot. Ask for EN 10204 3.1 or 3.2, and mention hardness testing or third-party inspection when you enquire. See our Quality Policy.