Uncompromising Joint Integrity: Why Buyers Trust Ganpat Industrial
Hardened and Tempered In-House
Every batch quenched, tempered and stress relieved before dispatch
One Enquiry, Full Range
Flat • Spring • Square • Taper – all types in one PO
High Load-Bearing Grade
Cr-Mo alloy steel built for structural and high-pressure joints
Hardness-Tested Every Lot
Rockwell hardness and dimensional check before packing
Quote In 24 Hours
Ready stock on standard sizes – ships same week
Alloy Steel Grade 7 Washer Overview
- 1Type: Flat, Hardened, Round, Square, Rectangular, Spring, Spherical, Bevel, Taper, Structural, Wave, Fender
- 2Size Range: M6 to M64 • OD 12 mm to 130 mm • per ASME B18.22.1
- 3Common Grades: ASTM A194 Gr 7, AISI 4140 / 4142, Chromium-Molybdenum Alloy Steel
- 4Condition: Quenched and Tempered, Black Oxide, Phosphate Coated, Zinc Plated
- 5Standards: ASTM A194, ASME B18.22.1, DIN 6796, ISO 7089/7090
- 6Origin: Indian origin • European origin • Traceable to heat number
Hardened Cr-Mo Alloy • ID/OD/Thickness Per Drawing • MTC 3.1 Issued
Or call our Mumbai office: +91 22 6743 7134 • Fast dispatch on ready stock sizes
Alloy Steel Grade 7 washers carry strong alloy strength. Ordinary carbon steel rings fail under load. Added hardenability keeps every joint completely tight. Mild steel washers crush under heavy pressure. Ganpat Industrial forges Grade 7 washers in house. We use mill certified bar stock for production. Fasteners are blanked and punched with precision. Cold forming builds flat and spring profiles. Buyers choose Grade 7 for high pressure flanges. Wind turbine foundations require this strong alloy. Heavy earthmoving equipment needs high strength washers. Bolting loads are never light on busy sites. Ganpat Industrial Corporation manufactures top alloy fasteners. We ship custom orders across India and UAE.
Mumbai · Alloy Steel Grade 7 Washers Manufacturer India
Heavy Duty Grade 7 Washers Built For Loads Where Standard Steel Rings Already Fail
Ganpat Industrial forges and supplies ASTM A194 Gr 7 / Chromium-Molybdenum Alloy Steel Washers for buyers running high-pressure flange joints, structural steel connections, wind energy foundations and heavy machinery assemblies across India, the UAE and the Middle East.
- ✓ISO 9001:2015
- ✓ISO 14001:2015
- ✓OHSAS 18001:2007
- ✓PED Certified
- ✓Petrofac Approved
Source Gr 7 Hardened Washer Supplier In India In Size Range Of M6 To M100
Alloy Steel Grade 7 Washer Specification
Gr 7 Hardened Washer Material
- ASTM A194 Gr 7
- AISI 4140 / 4142
- Chromium-Molybdenum Steel
- ASME B18.22.1
High Strength Alloy Steel Washer Testing
- Hardness Test (HRC)
- PMI Testing
- Dimensional Check
- Third-Party Inspection
Heavy Duty Grade 7 Washer Origin
- Indian Origin
- European Origin
- Traceable To Heat Number
- Mill-Direct Bar Stock
Alloy Steel Gr 7 Washer Size Range
- ID: M6 – M64
- OD: 12 – 130 mm
- Thickness: 1.5 – 12 mm
- Custom sizes on drawing
Grade 7 Washer Documentation
- Mill Test Certificate 3.1
- NABL Lab Report
- Packing List
- Certificate Of Origin
Alloy Steel Washer Surface Finish
- Black Oxide
- Zinc Plated
- Phosphate Coated
- Natural / Mill Finish
Looking For A Custom Grade 7 Washer Dimension?Send your drawing and get a factory-price quote within 24 hours.
Gr 7 Hardened Flat Washer Size Chart
We stock M6 to M64 sizes as an Alloy Steel GR 7 Washers Supplier in India.
| Bolt Size | ID (mm) | OD (mm) | Thickness (mm) |
|---|---|---|---|
| M6 | 6.4 | 12.5 | 1.6 |
| M8 | 8.4 | 17.0 | 2.0 |
| M10 | 10.5 | 21.0 | 2.5 |
| M12 | 13.0 | 24.0 | 2.5 |
| M16 | 17.0 | 30.0 | 3.0 |
| M20 | 21.0 | 37.0 | 3.0 |
| M24 | 25.0 | 44.0 | 4.0 |
| M27 | 28.0 | 50.0 | 4.0 |
| M30 | 31.0 | 56.0 | 4.0 |
| M36 | 37.0 | 66.0 | 5.0 |
| M42 | 43.0 | 78.0 | 7.0 |
| M48 | 50.0 | 92.0 | 8.0 |
| M56 | 58.0 | 105.0 | 9.0 |
| M64 | 66.0 | 115.0 | 10.0 |
Get Heat Treated Alloy Steel Gr 7 Washer Built For High Strength Industrial Bolting
Alloy Steel Gr 7 Washer Heat Treatment Process
Quenching and tempering gives every Alloy Steel Gr 7 Washer its rated hardness and clamp strength.
Normalizing
Bar stock is heated evenly to refine and uniform the raw steel grain structure.
Austenitizing
Washers are heated above critical temperature to prepare the steel for hardening.
Quenching
Rapid oil quenching locks in maximum hardness across every washer size.
Tempering
Controlled reheating relieves stress and adds the toughness needed for bolted joints.
Types Of Heavy Duty Grade 7 Washers
Alloy Steel Grade 7 Flat Washers
ISO 7089
Heavy Duty Grade 7 Square Washers
Square Plate
Grade 7 Spring Washers
DIN 127
Alloy Steel Spherical Washers
DIN 6319
Gr 7 Taper Washers
EN 10269
Heavy Duty Grade 7 Wave Washers
Wavy Spring
Alloy Steel Gr 7 Fender Washers
Wide OD
High Strength Alloy Steel Round Washer Weight Chart
| Size | Approx. Weight (Kg / 100 Nos.) | Approx. Weight (Kg / 1000 Nos.) |
|---|---|---|
| M6 | 0.09 | 0.90 |
| M8 | 0.19 | 1.90 |
| M10 | 0.35 | 3.50 |
| M12 | 0.48 | 4.80 |
| M16 | 0.98 | 9.80 |
| M20 | 1.62 | 16.20 |
| M24 | 3.05 | 30.50 |
| M27 | 4.10 | 41.00 |
| M30 | 5.35 | 53.50 |
| M36 | 8.70 | 87.00 |
| M42 | 16.20 | 162.00 |
| M48 | 26.40 | 264.00 |
What Actually Moves The Price
◆Order Quantity
◆Type (Flat / Spring / Structural)
◆Finish and Hardness Class
Get A Live Alloy Steel Gr 7 Washer Quote TodayFactory price, ready stock on standard sizes, and no minimum order penalty on repeat buyers.
Application Of Alloy Steel Gr 7 Structural Washers
Our washers handle flange, structural and turbine loads as an Alloy Steel GR 7 Washers Manufacturer in India.
High-Pressure Flange Joints
Structural Steel Bolted Connections
Wind Turbine Tower Foundations
Heavy Earthmoving and Mining Equipment
Oil and Gas Wellhead Assembly
Power Plant Boiler and Turbine Casing
Railway Track and Bridge Fastening
High-Vibration Machine Base Bolting
Sourcing Grade 7 Washers For A Project?Share your BOQ and get factory pricing with MTC 3.1, dispatched the same week.
Alloy Steel Grade 7 Spring Washer Pressure Rating
Proof load goes up to 615 kN as an Alloy Steel GR 7 Washers Supplier in India.
M12 Washer Proof Load
≥ 65 kN
Light Structural
M20 Washer Proof Load
≥ 178 kN
Medium Duty
M27 Washer Proof Load
≥ 335 kN
Heavy Duty
M36 Washer Proof Load
≥ 615 kN
Extra Heavy Duty
Grade 7 Square Washer Dispatch Schedule Chart
| Order Type | Quantity | Dispatch Lead Time |
|---|---|---|
| Ready Stock Standard Size | Up to 500 pcs | 2 – 3 Days |
| Bulk Standard Size | 500 – 5,000 pcs | 5 – 7 Days |
| Large Production Run | 5,000 – 20,000 pcs | 10 – 15 Days |
| Custom Drawing / Non-Standard Size | Any Quantity | 15 – 20 Days |
| Export Container Load (FCL) | Full Container | 20 – 25 Days |
Weekly Delivery Of Alloy Steel Gr 7 Washers In Below Countries
Weekly Export Schedule • Direct From Mumbai
| Export To | Continent | Port | Shipping Time |
|---|---|---|---|
| Saudi Arabia | Asia | Dammam Port | 6 Days |
| Indonesia | Asia | Tanjung Priok Port | 12 Days |
| South Africa | Africa | Durban Port | 18 Days |
Alloy Steel Gr 7 Washer Monthly Delivery In Below Countries
Monthly Export Schedule • Direct From Mumbai
| Export To | Continent | Port | Shipping Time |
|---|---|---|---|
| Kuwait | Asia | Shuwaikh Port | 8 Days |
| Italy | Europe | Genoa Port | 22 Days |
Heavy Duty Grade 7 Hardened Washer Chemical Composition
Chemistry is tested on every heat as an Alloy Steel GR 7 Washers Manufacturer in India.
Carbon
0.38–0.48%
Manganese
0.75–1.00%
Silicon
0.15–0.35%
Chromium
0.80–1.10%
Molybdenum
0.15–0.25%
Phosphorus
≤ 0.035%
Sulphur
≤ 0.040%
Alloy Steel Spherical Washer Mechanical Properties
Tensile strength stays above 860 MPa as an Alloy Steel GR 7 Washers Supplier in India.
Tensile Strength (MPa)
≥ 860
Load Bearing
Proof Load / Yield (MPa)
≥ 720
Design Limit
Hardness
24–34 HRC
Wear Resistance
Elongation
≥ 14%
Ductility
Working On A Heavy-Load Bolted Joint?Give us the size and grade, and we will recommend the right finish and testing.
Gr 7 Hardened Taper Washer Material Equivalent Grades
ASTM / ASME
- A194 Gr 7
- A320 Gr L7 (Bolting)
- AISI 4140 / 4142
EN / DIN
- 42CrMo4
- EN 10269
- 1.7225
BS
- BS 4882 Gr 7
- BS EN 10269
JIS
- SCM440
- JIS B1186
IS
- IS 1367
- IS 6623
GB
- GB/T 3098.1
- 42CrMo
Grade 7 Fender Washer HSN Code and GST Rate
HSN Heading
7318
Screws, bolts, nuts and washers of iron/steel
Flat / Plain Washer
7318 22 00
Non-threaded: other washers
Spring / Lock Washer
7318 21 00
Non-threaded: spring and lock washers
GST Rate
18%
Standard rate on alloy steel washers
Alloy Steel Grade 7 Washer Documentation Offered
Mill Test Certificate 3.1
Heat number traceable chemistry and mechanical results
Every Order
Packing List
Itemised piece count, weight and carton breakup
Every Order
Certificate Of Origin
For customs clearance and import duty processing
Export Orders
Commercial Invoice
PO-matched invoice with HSN and GST breakup
Every Order
Common Questions About Grade 7 Washers
Is Alloy Steel Grade 7 Hardened Washer magnetic?
Yes. Being a chromium-molybdenum alloy steel, Alloy Steel Grade 7 Hardened Washers are magnetic, unlike austenitic stainless grades.
Can Gr 7 Hardened Structural Washers be used with high-tensile bolts?
Yes. Their hardness and proof load make Gr 7 Hardened Structural Washers suited to high-tensile bolted joints under heavy clamp load.
What is the minimum order quantity for High Strength Alloy Steel Flat Washers?
Ganpat Industrial supplies High Strength Alloy Steel Flat Washers from small trial lots to full container loads, share size and quantity for a factory-price.
What sizes are available in stock for Heavy Duty Grade 7 Round Washers?
Standard sizes from M6 to M64 are held in ready stock for Heavy Duty Grade 7 Round Washers; other sizes are produced on drawing.
What surface finish options are offered for Alloy Steel Gr 7 Spring Washers?
Alloy Steel Gr 7 Spring Washers are supplied in black oxide, zinc plated, phosphate coated or natural mill finish.
Is a Mill Test Certificate provided for Grade 7 Bevel Washers?
Yes. Every dispatch of Grade 7 Bevel Washers is accompanied by a Mill Test Certificate 3.1 with heat-wise chemistry and mechanical results.
AMaterial Inspection Facility in Following Regions
Global Supply Coverage • Region-Wise Country List
| Regions | Country |
|---|---|
| South Carolina | USA |
| North America | USA, Canada, Mexico |
| South America | Brazil, Argentina, Colombia |
| North Africa | Egypt, Morocco, Algeria |
| West Africa | Nigeria, Ghana, Senegal |
| East Africa | Kenya, Ethiopia, Tanzania |
| Middle East | Saudi Arabia, Iran, Iraq |
| South Asia | India, Pakistan, Bangladesh |
| East Asia | China, Japan, South Korea |
| Melanesia | Fiji, Papua New Guinea |
6 Reasons to choose Ganpat Industrial Corporation
- Distributor of Heat Exchanger parts and Alloys for High Temperature applications.
- Stockholder and importer of Ferrous and non ferrous metals.
- Wide stock of prime quality austenitic and Ferritic Stainless Steel for Extreme pressure environment.
- Marine grade steel at lowest price in Mumbai.
- Compare Price per KG in India and China.
- Offer Resale price to local suppliers, traders and wholesalers in UAE, Saudi Arabia, Egypt, and USA