Why Buyers Lock Their Gr 7M Washer Orders With Ganpat Industrial ?
Sour-Service Safe
Every piece held under 22 HRC – NACE MR0175 ready
100% Hardness Tested
Piece-by-piece Brinell check, not sample-lot testing
Chrome-Moly Heats
AISI 4142 / 42CrMo4 mill-certified raw material only
9 Types, One PO
Flat • Spring • Star • Sealing – single enquiry covers all
48-Hr Dispatch
M6—M64 ready stock moves out of Mumbai in 2 days
Alloy Steel GR 7M Washer Overview
- 1Grade: ASME SA194 Gr 7M • AISI 4142 • UNS G41400 • EN 1.7225
- 2Type: Flat, Spring, Star, Slot, Plain, Machine, Conical, Split, Sealing
- 3Size: M6 to M64 • OD 12 mm to 115 mm • custom on drawing
- 4Hardness: 159—235 HB • max 99 HRB • within NACE 22 HRC cap
- 5Heat Treat: Quenched + tempered at 620°C minimum
- 6Certificate: MTC EN 10204 3.1 • NACE MR0175 • TPI on request
Or call our Mumbai office: +91 22 6743 7134 • Same-day pricing on stock sizes
Alloy Steel Grade 7M washers eliminate sour gas risks. Soft washers cause critical pipeline failure. Specialized heat treatment keeps hardness below 235 HB. Individual testing prevents dangerous hydrogen embrittlement. Acidic H2S environments demand strict hardness limits. Ganpat Industrial manufactures Grade 7M washers. We use certified bar stock for production. Washers pair with B7M stud bolts perfectly. Each shipment includes full test documentation. The complete hardness report arrives with your package. Refineries and gas plants trust our quality. We deliver stock orders across India Middle East.
Mumbai · Alloy Steel GR 7M Washers Exporter & Stockist India
Heavy Duty Alloy Steel Gr 7M Washer
Sour wells do not forgive hard washers. Ganpat Industrial stocks ASME SA194 Gr 7M washers tempered soft on purpose – under 22 HRC, 100% tested – so your B7M bolting package clears NACE audit the first time.
- ✓NACE MR0175 Compliant
- ✓MTC EN 10204 3.1
- ✓100% Hardness Tested
- ✓ISO 9001:2015
- ✓Third-Party Inspection
Order NACE MR0175 Split Washers From A Leading Exporter And Stockist In Dimensions M6 To M100
Alloy Steel GR 7M Washers Specification
AS GR 7M Washer Grade Codes
- ASME SA194 Gr 7M
- AISI 4142
- UNS G41400
- EN 1.7225 (42CrMo4)
Grade 7M Washer Hardness Window
- 159 HB Minimum
- 235 HB Maximum
- 99 HRB Cap
- Below NACE 22 HRC Limit
Alloy Steel 7M Heat Treatment
- Oil Quenched
- Tempered ≥ 620°C
- No Machining After HT
- Stress-Relieved Blanks
Gr 7M Slot Washer Size Range
- ID: M6 – M64
- OD: 12 – 115 mm
- Thickness: 1.6 – 9 mm
- Cut To Drawing
UNS G41400 Washer Testing
- 100% Brinell Hardness
- PMI Verification
- Charpy S3 On Request
- Dimensional Report
AISI 4142 Washer Surface Finish
- Black Oxide
- Phosphate Coated
- Zinc / PTFE On Request
- Plain Mill Finish
Alloy Steel Gr 7 Round Washers Size Chart
Standard Pattern Per ISO 7089 / DIN 125A • Verified Dimensions
| Size | Inner Dia (d1) | Outer Dia (d2) | Thickness (h) |
|---|---|---|---|
| M6 | 6.4 | 12 | 1.6 |
| M8 | 8.4 | 16 | 1.6 |
| M10 | 10.5 | 20 | 2.0 |
| M12 | 13 | 24 | 2.5 |
| M16 | 17 | 30 | 3.0 |
| M20 | 21 | 37 | 3.0 |
| M24 | 25 | 44 | 4.0 |
| M30 | 31 | 56 | 4.0 |
| M36 | 37 | 66 | 5.0 |
| M42 | 43 | 78 | 7.0 |
| M48 | 50 | 92 | 8.0 |
| M56 | 58 | 105 | 9.0 |
| M64 | 66 | 115 | 9.0 |
Have A B7M Stud List Waiting For Washers ?Send sizes on WhatsApp – priced sheet back within 4 working hours.
Quenched & Tempered Gr 7M Chrome Moly Washers In Custom Sizes For Sour Service Bolting
Alloy Steel Grade 7 Structural Washers Application
From sour gas wellheads to offshore platform bolting, Ganpat Industrial remains a trusted Alloy Steel GR 7 Washers Supplier in India.
Sour Gas Wellheads
Refinery Flange Joints
Christmas Tree Valves
Gas Processing Plants
Offshore Platforms
Pressure Vessel Closures
Pipeline Pig Traps
Heat Exchanger Bolting
Types Of Alloy Steel Grade 7M Washers
Gr 7M Flat Washer
ISO 7089
AS GR 7M Spring Washer
DIN 127
ASME SA194 Gr 7M Star Washer
Serrated
Grade 7M Conical Washer
DIN 6796
EN 1.7225 Split Washer
Split Lock
Gr 7M Sealing Washer
Bonded Seal
Grade 7 Spring Washers Weight Chart
Flat Pattern Basis • Density 7.85 g/cm³ • For Freight & Packing Estimates
| Size | Weight / Pc (g) | Weight / 1000 Pcs (kg) |
|---|---|---|
| M6 | 1.02 | 1.02 |
| M8 | 1.83 | 1.83 |
| M10 | 3.57 | 3.57 |
| M12 | 6.27 | 6.27 |
| M16 | 11.3 | 11.3 |
| M20 | 17.2 | 17.2 |
| M24 | 32.3 | 32.3 |
| M30 | 53.6 | 53.6 |
| M36 | 92.0 | 92.0 |
High Strength Alloy Steel Taper Washers Pressure Rating
Service Envelope Of The B7M / 2HM / 7M Bolting Set It Clamps
ASME B16.5 Class
150 – 2500#
Service Temp Range
-48°C to +400°C
H2S Partial Pressure
NACE Zone OK
Hydro Test Joints
1.5× Design
Heavy Duty Grade 7 Flat Washers Dispatch Schedule Chart
From PO To Port • Committed Timelines
Ready Stock
Up to 500 pcs • 2—3 days
Bulk Standard
500—5,000 pcs • 5—7 days
Production Run
5,000—20,000 pcs • 10—15 days
Custom Drawing
Any qty • 15—20 days
FCL Export
Container load • 20—25 days
Alloy Steel Hardened Washers Chemical Composition
Ladle Analysis Per ASTM A194 Gr 7 / 7M • Tested Every Heat
Carbon (C)
0.37—0.49%
Manganese (Mn)
0.65—1.10%
Chromium (Cr)
0.75—1.20%
Molybdenum (Mo)
0.15—0.25%
Silicon (Si)
0.15—0.35%
Phosphorus (P)
≤ 0.035%
Sulphur (S)
≤ 0.040%
Gr 7 Hardened Wave Washers Mechanical Properties
Trusted Alloy Steel GR 7M Washers Manufacturer in India with piece-by-piece hardness verification.
Hardness Minimum
159 HB
Lower Limit
Hardness Maximum
235 HB / 99 HRB
Sour-Service Cap
NACE MR0175 Limit
≤ 22 HRC
100% Verified
Tempering Temperature
≥ 620°C
Min 1150°F
Mating Nut Proof Stress
150 ksi
A194 7M Set
Impact Option
Charpy S3
Low-Temp Lots
Alloy Steel Gr 7 Fender Washers Material Equivalent Grades
Hardness-verifies every piece within the NACE 22 HRC limit as a reliable GR 7M Washers Manufacturer in India.
USA / ASTM
- ASME SA194 Gr 7M
- ASTM A194 Gr 7M
- AISI 4140 / 4142
- UNS G41400 / G41420
Europe / EN
- EN 1.7225
- 42CrMo4
- DIN 1.7225
- BS 708M40 (EN19)
Asia / JIS & GB
- JIS SCM440
- GB 42CrMo
- IS 40Cr4Mo3
- KS SCM440
Grade 7 Spherical Washers vs Gr 7M – Which One Does Your PO Need ?
The Single Most-Asked Buyer Question – Answered In 30 Seconds
Alloy Steel Gr 7 Washer
- 1Hardness: up to 321 HB (35 HRC)
- 2Testing: sample lot basis
- 3Pairs with: B7 studs, 2H nuts
- 4Best for: sweet, high-temp flanges
Alloy Steel Gr 7M Washer
- 1Hardness: capped 235 HB (99 HRB)
- 2Testing: 100% piece-by-piece
- 3Pairs with: B7M studs, 2HM nuts
- 4Best for: H2S / NACE sour service
Send Your Gr 7M Washer List Before 4 PM ISTGet hardness-certified stock confirmation and freight-included pricing the same working day.
Weekly Delivery Of Alloy Steel GR 7M Washers In Below Countries
Weekly Export Schedule • Direct From Mumbai
| Export To | Continent | Port | Shipping Time |
|---|---|---|---|
| UAE | Asia | Jebel Ali Port | 4 Days |
| Qatar | Asia | Hamad Port | 7 Days |
| Singapore | Asia | Singapore Port | 9 Days |
| Colombia | South America | Barranquilla | 45 Days |
| Nigeria | Africa | Calabar | 30 Days |
| Indonesia | Asia | Belawan | 9 Days |
Alloy Steel GR 7M Washer Monthly Delivery In Below Countries
Monthly Export Schedule • Direct From Mumbai
| Export To | Continent | Port | Shipping Time |
|---|---|---|---|
| USA | North America | Houston Port | 28 Days |
| Egypt | Africa | Alexandria Port | 14 Days |
| Argentina | South America | La Plata | 45 Days |
| Philippines | Asia | Zamboanga | 14 Days |
Common Questions About Alloy Steel GR 7M Washers
What does the “M” in Alloy Steel Grade 7 Square Washers mean ?
It marks a modified grade – tempered hotter, capped at 235 HB, and 100% hardness tested. It is not a metric designation.
Is every Gr 7 Hardened Rectangular Washers piece hardness tested ?
Yes. Each piece is Brinell checked individually, and the readings ship on the hardness test sheet with the MTC 3.1.
Can a High Strength Alloy Steel Bevel Washers piece replace a Grade 7M washer in sour service ?
No. Gr 7 can run up to 321 HB – well past the NACE 22 HRC limit. Substitution needs written engineer approval.
Which studs and nuts pair with Heavy Duty Grade 7 Round Washers ?
ASTM A193 B7M studs with A194 2HM or 7M nuts. Ganpat Industrial supplies matched, heat-lot-paired sets.
What is the minimum order for Alloy Steel Gr 7 Flat Washers ?
Trial lots ship from 100 pcs on stock sizes. Custom-drawing pieces are quoted from 500 pcs.
Do you supply NACE MR0175 certificates with Grade 7 Spring Washers ?
Yes – NACE compliance statement, MTC EN 10204 3.1 and third-party inspection are available on every export lot.
Material Inspection Facility in Following Cities
Direct Dispatch From Mumbai To Your Nearest Hub
| City | Country |
|---|---|
| Texas | USA |
| California | USA |
| Al Jubail | Saudi Arabia |
| Dubai | UAE |
| Dammam | Saudi Arabia |
| Abu Dhabi | UAE |
| Riyadh | Saudi Arabia |
| Houston | USA |
| Al Khobar | Saudi Arabia |
| Indiana | USA |
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