ISO 9001:2015 Certified ASTM F593 Bolts Manufacturer Ex-Stock Group 1 & Group 2 Alloys, EN 10204 3.1 MTC 15+ Yrs Experience, Exports To 15+ Countries

ASTM A194 Grade 7 Nuts

ASTM A194 Grade 7 Nuts Quick Technical Overview

HS Code73181600
Sizes In Stock1/4″ to 4″ • M6 to M100
Companion BoltingASTM A193 B7 • ASTM A320 L7
Governing StandardASTM A194/A194M • ASME SA-194
Manufacturing ProcessHot Forged, Machined & Thread-Tapped
Temper ConditionQuenched & Tempered, 593°C (1100°F) Min
FormsHeavy Hex, Jam, Square, Castle, Coupling
GradeGrade 7 • Grade 7M (Sour Service)
MTC CertificateEN 10204 Type 3.1
Thread SeriesUNC to 1″, 8UN Above • Class 2B
Delivery TimeEx-Stock: 24–72 Hrs • Mill-Order: 3–4 Wks
Alloying Elements0.75–1.20% Chromium, 0.15–0.25% Molybdenum
Proof-Load Tested
175 ksi On Grade 7
Load and hardness figures printed on every certificate
Same-Day Picking
On Ex-Stock Sizes
Heavy hex and jam nuts boxed before cut-off
Sour Service Ready
Grade 7M At 22 HRC Max
Hardness held inside the NACE MR0175 ceiling
19+ Countries
Export Track Record
Gulf refineries to Canadian and African contractors
Forged In-House
No Trader Layer
Bar to finished nut under our own roof
Matched Bolting
Studs Supplied Together
B7 or L7 studs picked to suit your nut order
astm a194 grade 7 nuts

 

0 · at glance

Mortec At A Glance

Established

Since 2012 • 14 yrs in alloy bolting

Manufacturing Units

2 in-house units • Taloja & Mazgaon

Stockyard Area

8,850+ sq.ft • Ready-stock inventory

Certifications

ISO 9001:2015 • GST, IEC & MSME

Clientele

100+ clients • India & export markets

Export Reach

19+ countries • GCC, Africa & Americas

Testing Offered

Proof load, hardness & chemical • MTC EN 10204 3.1

Shipment Documents

Invoice, Packing List • COO, COI, MTC, BL & Lab Report

Proof Load Certified ASME SA 194 Gr 7 Heavy Hex Nut Manufacturer in India As Per Custom Dimensions

Plants in Dubai, Johannesburg, Nairobi and Calgary turn to us when a joint has to hold pressure and the fastener has to come with paperwork that proves it. We forge ASTM A194 Grade 7 nuts from chromium molybdenum bar of the 4140 family, quench and temper them above 593 degrees Celsius, then check hardness and proof load before boxing. Standard A194 7 hex nuts and A194 7L heavy hex nuts, with full ASTM A194 Grade 7 nut dimensions on request, stay stocked at our Mumbai works from quarter inch to 4 inch and M6 to M100, so orders leave within 24 to 72 hours.

Alongside heavy hex, we also turn out A194 Grade 7 jam nuts, A194 Grade 7 castle nuts and A194 Grade 7 coupling nuts for buyers needing more than the basic pattern. Outside standard sizes, we machine to your drawing rather than substitute a catalogue item, covering ASTM A194 Grade 7 all metal lock nuts, ASME SA 194 Grade 7 dome nuts, and square or thin square variants in Grade 7 and 7M. Every box carries an EN 10204 Type 3.1 mill certificate with heat number, chemistry, hardness and proof load, plus the export paperwork your clearing agent needs.

01 · Specification

ASTM A194 Grade 7 Nuts Specification

Share your across flats breakdown with quantity and Mortec as ASTM A194 Grade 7 nut exporter returns pricing instantly.

astm a194 grade 7 nuts specification  

A194 Gr 7 Nut Sour Service Compliance

  • Grade 7M to NACE MR0175 / ISO 15156
  • Hardness held at 22 HRC maximum

ASME SA 194 Gr 7 Nut Testing Scope

  • Proof load, hardness, chemical analysis
  • Charpy V-notch impact when specified

A194 7 Hex Nuts Coating Options

  • Self-colour, black oxide, phosphate
  • Hot-dip galvanized, zinc plated, PTFE

A194 gr 7 Jam Nuts Marking & Traceability

  • Grade symbol plus maker identification
  • Heat number carried through to the MTC

ASTM A194 7 Nut Third-Party Inspection

  • SGS, BV, TUV, Lloyd’s and Intertek
  • Client-nominated inspector welcomed

ASTM A194 gr7 Square Nuts Export Packing

  • VCI-lined cartons on fumigated pallets
  • Size-wise labelling for site segregation

ASTM A194 Grade 7 Nut Order Quantity

  • Trial box from 100 pieces per size
  • Container-load rates on repeat schedules

ASTM A194 Grade 7 Heavy Hex Nuts Dimensional Standard

  • ASME B18.2.2 heavy hex nut dimensions
  • Threaded per ASME B1.1, Class 2B fit

ASME SA 194 Gr 7 Bar Stock Origin

  • Indian, European and Japanese bar
  • Certificate of origin issued on request
02 · Sizing

ASTM A194 Grade 7 Nut Dimensions

Complete ASTM A194 Grade 7 Nut Dimensions chart from 1/4 to 4 inch available covering ASME B18.2.2 profiles and B1.1 threading.

Fastest Moving 1/2″ 5/8″ 3/4″ 1″ 1-1/4″
Heavy Hex Nut Dimensions – ASME B18.2.2 (inch)
Nominal Size Thread Series Width Across Flats Nut Thickness
1/2″1/2-13 UNC7/8″ (0.875)31/64″ (0.484)
5/8″5/8-11 UNC1-1/16″ (1.062)39/64″ (0.609)
3/4″3/4-10 UNC1-1/4″ (1.250)47/64″ (0.734)
7/8″7/8-9 UNC1-7/16″ (1.438)55/64″ (0.859)
1″1-8 UNC1-5/8″ (1.625)63/64″ (0.984)
1-1/8″1-1/8-8 UN1-13/16″ (1.812)1-7/64″ (1.109)
1-1/4″1-1/4-8 UN2″ (2.000)1-7/32″ (1.219)
1-3/8″1-3/8-8 UN2-3/16″ (2.188)1-11/32″ (1.344)
1-1/2″1-1/2-8 UN2-3/8″ (2.375)1-15/32″ (1.469)

Thread Rules That Catch Buyers Out

Up to and including 1″Coarse UNC series
Above 1″8UN series, not coarse
Class of fitClass 2B per ASME B1.1
Galvanized nutsTapped oversize after coating

Ranges We Hold

Imperial1/4″ to 4″
MetricM6 to M100
Above 4″Machined against order
Non-standard heightCut to your drawing

Supply High-Torque A194 7 Jam Nuts and Castle Nuts Ready Stock With EN 10204 3.1 Traceable Mill Test Reports

03 · Quality

A194 7 Hex Nuts Testing & Certification

Our in house lab as ASTM A194 Grade 7 nut exporter records each requested check directly onto your certificate.

Proof Load Test
Brinell Hardness
Rockwell Hardness
Chemical Analysis
PMI Testing
Dimensional Inspection
Thread Gauge Check
Charpy Impact On Request
Microstructure Examination
Coating Thickness Check
Heat-Lot Traceability
MTC EN 10204 3.1
04 · Product Range

ASTM A194 Grade 7 Nuts Types

Ranking among leading ASTM A194 Grade 7 nuts suppliers in India we stock every pattern and machine non standard sizes.

ASTM A194 Grade 7 Heavy Hex Nuts

ASTM A194 Grade 7 Heavy Hex Nuts

ASME B18.2.2 • 1/4″–4″
  • The standard A194 flange bolting nut
  • Most-ordered pattern against B7 studs
ASTM A194 7 Heavy Hex Jam Nuts

ASTM A194 7 Heavy Hex Jam Nuts

ASTM A194 Form • 1/2″–4″
  • Covered by the A194 specification
  • Locking nut run against a full nut
ASTM A194 Gr 7 Hex Nut

ASTM A194 Gr 7 Hex Nut

Finished Hex • Made To Order
  • Slimmer across-flats than heavy hex
  • Used where wrench room is tight
ASME SA 194 Gr 7 Coupling Nut

ASME SA 194 Gr 7 Coupling Nut

Extended Length • Machined
  • Joins two threaded rods end to end
  • Length machined to your drawing
ASTM A194Gr7 Castle Nut

ASTM A194Gr7 Castle Nut

Slotted Crown • Machined
  • Takes a split pin through the slot
  • Anti-rotation on rotating assemblies
ASTM A194 Gr 7 Square Nut

ASTM A194 Gr 7 Square Nut

Four Flats • Made To Order
  • Seats in channel and slot fixings
  • Larger bearing face than hex

Forging ASTM A194 Grade 7 Nuts Manufacturer In Mumbai Since The Year 2012

Share your across flats requirement and receive pricing based on the current alloy bar rate.

Request Quote Now
05 · Composition

ASTM A194 Grade 7 Chemical Composition

Both Grade 7 and 7M share identical chemistry under ASTM A194 Grade 7 Chemical Composition, differing only in tempering and hardness.

C0.37–0.49Carbon
Mn0.65–1.10Manganese
Si0.15–0.35Silicon
Cr0.75–1.20Chromium
Mo0.15–0.25Molybdenum
P0.035 maxPhosphorus
S0.040 maxSulphur
FeBalanceIron
06 · Strength Data

ASTM A194 Grade 7 Mechanical Properties

As a trusted ASTM A194 Grade 7 nut supplier we base every claim on the two properties the standard qualifies, logged lot by lot.

Proof Load Stress175,000 psi / 1207 MPa
Brinell Hardness248–352 HBW
Rockwell Hardness24–38 HRC
Tempering Temperature593°C / 1100°F min

Why You Will Not See A Tensile Figure Here

ASTM A194 qualifies finished nuts by proof load and hardness. A tensile coupon cannot represent how a nut loads. Instead, a hardened mandrel is pulled through the thread. This confirms the nut holds without stripping or deforming. Any tensile figure quoted against Grade 7 nuts misleads. It is a bar-stock number, not a nut property. We publish the two values the standard actually recognises. Both are recorded on your mill test certificate.

Qualified ByProof Load & Hardness
Grade 7M Hardness22 HRC Maximum
Test FrequencyPer Heat & Lot
07 · Cross-Reference

ASTM A194 Grade 7 Equivalent Material Grades

These ASTM A194 Grade 7 Equivalent listings trace the chromium molybdenum origin of the steel and serve only as close references not replacements.

USAASTM / ASME / AISI (USA)

  • ASTM A194 Grade 7 & 7M
  • ASME SA-194 Grade 7 & 7M
  • AISI 4140 / 4142 / 4145
  • UNS G41400

GermanyDIN / EN (Germany)

  • 42CrMo4
  • Werkstoff 1.7225
  • DIN 935 / 1587 (Nut Form)

UKBS (United Kingdom)

  • BS 708M40
  • En19

JapanJIS (Japan)

  • SCM440
  • Follows JIS B1181 (Nut Form)

FranceAFNOR (France)

  • 42CD4

ChinaGB/T (China)

  • 42CrMo
Global Reach

Your ASME SA 194 Gr 7 Heavy Hex Nut Partner In Africa & The Gulf

Container ready bolting for refineries wellheads and pipelines dispatched regularly to Southern Africa and the GCC region.

Africa & GCC
South AfricaDurban & Secunda, SA
KenyaNairobi & Mombasa, Kenya
UgandaKampala, Uganda
UAEDubai & Ruwais, UAE
Saudi ArabiaJubail, Saudi Arabia
TurkeyIstanbul, Turkey
08 · Comparison

ASTM A194 Grade 2H Nuts Vs ASTM A194 Grade 7 Nuts

Buyers most often ask ASTM A194 Grade 7 Vs 2H which comes down to alloy content and service temperature

ASTM A194 Grade 2H Nuts

  • Material: Medium carbon steel
  • Tempering: 538°C (1000°F) minimum
  • Hardness: 248–352 HBW
  • Usual Pairing: A193 B7 studs
  • Low Temperature: Not the specified nut for A320
  • Relative Cost: Lower

ASTM A194 Grade 7 Nuts

  • Material: Chromium-molybdenum alloy steel
  • Tempering: 593°C (1100°F) minimum
  • Hardness: 248–352 HBW
  • Usual Pairing: A320 L7 and A193 B7 studs
  • Low Temperature: The nut A320 calls up
  • Relative Cost: Higher, alloy content

Looking For Hardness Capped A194 Grade 7M Nuts On A Sour Service Line

Share your H2S service details and we hold release until hardness confirms below 22 HRC.

Talk To Our Bolting Desk
09 · Assembly

A194 7l Heavy Hex Nuts Pairing Guide

Correctness of a nut depends entirely on the stud it mates with, a pairing our export clients verify before flange kits depart.

ASTM A193 B7 StudGeneral high pressure and high temperature flange work – takes an A194 Grade 7 or Grade 2H nut.
ASTM A320 L7 StudLow temperature and cryogenic joints – A320 calls up an A194 Grade 7 or Grade 4 nut, not 2H.
ASTM A193 B7M StudSour service under NACE MR0175 – pair with A194 Grade 7M so the whole joint stays under 22 HRC.
ASTM A193 B16 StudElevated temperature creep service – specified with A194 Grade 4 or Grade 7 nuts.
Do Not Mix CoatingsA hot-dip galvanized stud needs an over-tapped galvanized nut; a plain nut will bind on the zinc.
Order As A SetWe supply stud, two nuts and washers picked and boxed per joint so site never opens a short kit.
10 · Finishes

A194 Gr 7 Jam Nuts Surface Coating

Finish selection governs thread running and weather resistance, and these coatings ship against every A194 7 Jam Nuts and Castle Nuts order.

Self-Colour Plain
Black Oxide
Manganese Phosphate
Hot-Dip Galvanized
Zinc Electroplated
PTFE / Xylan
Zinc Flake
Molybdenum Disulphide
11 · Fit-Up

Galvanizing For A194 Gr7 Heavy Hex Jam Nuts

Improperly matched coated nuts will bind on site, so correct sizing against the stud remains essential before dispatch.

Hot-dip galvanizing to ASTM A153 Class C or ASTM F2329
Electroplated zinc to ASTM B633 with embrittlement relief bake
Galvanized nuts tapped oversize so they run on a coated stud
Over-tapped nuts must be matched to galvanized bolting, never plain
12 · Industries

ASTM A194 7 Castle Nuts Applications

Wherever a joint must resist pressure heat or cold without leaking, ASTM A194 Grade 7 Nuts Manufacturer in India are trusted.

Oil & Gas Wellheads
Refinery Flange Joints
Petrochemical Plants
Power Generation
LNG & Cryogenic Lines
Offshore Platforms
Valves, Pumps & Compressors
Heat Exchangers & Boilers

Trusted A194 gr 7 Jam Nuts Exporter In India Serving Durban And Richards Bay South Africa

Weekly sailings from Nhava Sheva cover both full and part container shipments.

Request Export Quote
13 · Pricing

ASTM A194 gr 7 Coupling Nuts Price Factors

Per piece pricing depends on five factors, share your details and a reliable ASTM A194 Grade 7 nuts supplier in India confirms a fixed figure.

Alloy Bar RateChromium-molybdenum bar moves with the day’s mill offer and sets the floor price.
Across-Flats SizeWeight climbs sharply above 1″, so a large nut costs far more than the size step suggests.
Coating SpecifiedHot-dip galvanizing and PTFE add a process stage and a re-tapping operation.
Witnessing LevelThird party inspection and witnessed proof load testing carry their own line item.
Quantity Per SizeOne box of a size prices differently from a full pallet run of the same size.
Global Reach

Extending Our ASME SA 194 Gr 7 Heavy Hex Nut Supply Into North America & ASEAN

Turnaround contractors and regional stockists throughout Canada, the United States and Southeast Asia rely on our supply.

Americas & ASEAN
CanadaCalgary & Edmonton, Canada
USAUnited States
MexicoMexico
ThailandThailand
MalaysiaMalaysia
PhilippinesPhilippines
VietnamVietnam
IndonesiaIndonesia
SingaporeSingapore
14 · How It’s Made

ASTM A194 Gr7 Square Nuts Manufacturing Process

ASTM A194 Grade 7 Nuts Manufacturer in Mumbai forges tempers and taps every batch controlling hardness through consistent internal processing.

1

Bar Shearing

Chromium-molybdenum bar cut to blank weight per across-flats size.

2

Hot Forging

Blank upset and formed to the hex or square profile.

3

Quench & Temper

Hardened then tempered above 593°C to bring hardness into band.

4

Tapping & Marking

Thread tapped to Class 2B, proof load checked, grade and heat stamped.

15 · Turnaround

ASTM A194 Grade 7M Thin Square Nuts Delivery Timeline

Choose whichever freight mode suits your shutdown schedule, and dispatch begins as soon as order and payment are confirmed.

Ex-Stock Dispatch

Common heavy hex sizes are picked, boxed and handed to the transporter inside 24–72 hours

Sea Freight (FCL/LCL)

The economical route for bulk nut tonnage, generally 10–30 days on water from Nhava Sheva

Air Freight (Urgent)

Turnaround and emergency joints go by air cargo, landing in 3–6 days

Country-Specific ETA

Name your discharge port and we commit to a dated arrival window

Chennai Based ASTM A194 A194M Grade 7 Nut Supplier Offering NACE Ready Documentation

Proof load and hardness reports travel with the shipment instead of arriving weeks later.

Get Supplier Quote
Global Reach

Your ASTM A194 Gr 7 All Metal Lock Nuts Partner In The Middle East

Both stock and mill order bolting reach Gulf refineries EPC yards and valve builders at short notice.

Middle East & GCC
OmanSohar, Oman
UAEJebel Ali, UAE
Saudi ArabiaDammam, KSA
BahrainManama, Bahrain
UAEAbu Dhabi, UAE
KuwaitKuwait City
QatarRas Laffan, Qatar
Saudi ArabiaYanbu, KSA
16 · Track Record

ASME SA 194 Gr 7 Dome Nuts Supply References

Recent dispatch examples spanning Gulf, Africa and North America clients show bolting packages leaving on schedule through our export chain.

1-1/4″ A194 Grade 7 Heavy Hex Nuts - Refinery Flange Turnaround

Proof load tested, hardness logged, EN 10204 3.1 MTC.

Refinery Maintenance Contractor, UAE

RUWAIS, UAE

3/4″ A194 Grade 7M Heavy Hex Nuts - Sour Gas Wellhead Package

Hardness capped at 22 HRC, NACE MR0175 documentation.

Upstream EPC Contractor, Saudi Arabia

JUBAIL, SAUDI ARABIA

1″ A194 Grade 7 Nuts With L7 Studs - Cold Service Pipe Rack

Matched stud and nut sets, Charpy records supplied.

Gas Processing Contractor, Canada

CALGARY, CANADA

5/8″ A194 Grade 7 Jam Nuts - Mining Pump Overhaul Batch

Hot-dip galvanized and over-tapped, third party witnessed.

Mining Maintenance Contractor, South Africa

DURBAN, SOUTH AFRICA

1-1/2″ A194 Grade 7 Heavy Hex Nuts - Boiler Header Bolting

8UN thread, Class 2B gauged, chemistry certified.

Power Plant Contractor, Kenya

NAIROBI, KENYA

M36 A194 Grade 7 Castle Nuts - Offshore Riser Clamp Assembly

PTFE coated, split pins supplied, dimensional report issued.

Offshore Fabricator, Malaysia

JOHOR, MALAYSIA

Top Export Countries

UAE UAE Saudi Arabia Saudi Arabia South Africa South Africa Canada Canada UK United Kingdom Turkey Turkey Singapore Singapore United States United States Mexico Mexico Thailand Thailand Italy Italy Netherlands Netherlands Germany Germany Philippines Philippines Malaysia Malaysia Uganda Uganda Indonesia Indonesia Vietnam Vietnam Venezuela Venezuela

Set To Confirm Your A194 7 Jam Nuts and Castle Nuts Dispatch Plan

Get piece count based quotes for Gulf, African and Canadian buyers within a single working day.

Start My Order
17 · FAQs

ASTM A194 Grade 7 Nuts FAQs

Frequent queries handled by our bolting desk, being an ASTM A194 Grade 7 Nuts Manufacturer in India offering forging heat treatment and tapping together.

What is the difference between ASTM A194 Grade 7 Nuts and Grade 2H nuts?

Grade 2H is medium carbon steel, while Grade 7 is a chromium-molybdenum alloy, tempered slightly higher for added strength.

What proof load and hardness do ASTM A194 7 Castle Nuts meet?

Grade 7 heavy hex nuts are qualified by a proof load of 175,000 psi and a hardness of 248–352 HBW. ASTM A194 does not assign a tensile or yield figure to the finished nut.

What sizes and thread series are covered in ASTM A194 Grade 7 Nut Dimensions for A194 7l Heavy Hex Nuts?

We hold 1/4″ to 4″ and M6 to M100 in heavy hex, hex, jam and square patterns, threaded to Class 2B per ASME B1.1.

How is the price of A194 gr7 Heavy Hex Jam Nuts and ASTM A194 gr 7 Coupling Nuts worked out?

Price depends on the daily alloy bar rate, size, coating and inspection level. Send your size and quantity split for a firm ex-Mumbai figure.

Are ASTM A194 Grade 7m Thin Square Nuts supplied for NACE MR0175 sour service export orders?

Yes. Grade 7M shares the same chemistry but is tempered to hold hardness at 22 HRC maximum, the limit NACE MR0175 sets for sour service.

ASTM F593 Bolts - Built On Trust With Mortec
Fine-thread rolling holds tolerance across Group 1 and 2 alloys
Hex bolts, cap screws, studs and threaded rod kept ex-stock
Every heat-numbered lot PMI and tensile tested for F593 MTC
Custom head marking, length and passivation matched to your drawing

Materials



Products

Certifications & Credentials
Certified to PED 2014/68/EU for the manufacture of forged steel products
Stock, distribute and trade Steel Flanges, Nuts and Bolts, and precision-machined parts in Nickel Alloys, High Temperature Alloys and Super Alloys
Since 2012, exporting Oil and Gas piping items built to NACE MR0175 / ISO 15156 across the Egypt, Tunisia, Netherlands, Azerbaijan, South Africa, Algeria, Saudi Arabia and Morocco
Hold the largest import and stock inventory of bolting accessories, in both ferrous and non-ferrous metals, in India

Authorized Supplier For The Following Companies - Material At Reseller Price For Traders

Associated Companies - ADNOC, SABIC, Saudi Aramco, GASCO, ORPIC, KNPC, QATARGAS

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