Why Buyers Pick Ganpat Industrial For Alloy Steel B7 Washers ?
True B7 Chemistry
Cut from AISI 4140 / 4142 bar to A193 B7 limits.
Quenched & Tempered
Tempered at 593°C minimum for strength and toughness.
M6 To M100 Range
Stock and custom sizes for small to heavy bolting.
Black Oxide & PTFE
Coatings applied to your drawing and service need.
MTC Backed Supply
Every lot ships with a Mill Test Certificate.
Alloy Steel B7 Washers Characteristics
- 1Product Range: Flat, Round, Lock, Spring, Split, Sealing, Conical, Star, Square & Slot Washers
- 2Size Range: M6 to M64 standard, custom sizes to M100 on request
- 3Grade: ASTM A193 / ASME SA193 Grade B7 Cr-Mo chemistry
- 4Standards: ISO 7089, DIN 125, DIN 9021, ASME B18.21.1, ASTM F436
- 5Surface Finish: Black Oxide, PTFE, Zinc Plated, Hot-Dip Galvanised
- 6Certification: EN 10204 3.1, 3.2 & Third-Party Inspection Reports
Ganpat Industrial Corporation cuts Alloy Steel B7 Washers from certified Cr-Mo bar stock. Each B7 AS Spherical Washer corrects angled bolt faces in flanged joints. An Alloy B7 Spring Washer holds clamp tension against vibration and thermal cycling. Alloy Steel B7 Slot Washers allow position adjustment without full disassembly. A B7 AS Conical Washer keeps preload steady through repeated heat cycles. B7 Alloy Steel Star Washers bite into soft mating faces to resist turning. An ASTM A193 Alloy Steel Machine Washer is turned to your exact drawing. Alloy Steel B7 Fender Washers cover oversize holes with a wide bearing face. Every A193 B7 Punched Washer is blanked from the same traceable heat lot.
Mumbai · Alloy Steel B7 Washers Manufacturer, Stockist & Exporter
We supply certified Alloy Steel B7 Washers for high-pressure bolted piping joints.
Ganpat Industrial Corporation, Mumbai, has forged and stocked steel fasteners since 1997. We supply Cr-Mo B7 washers in flat, lock, spring and special styles. Each order can ship with an MTC and third-party inspection report.
- ✓Since 1997
- ✓ISO 9001:2015
- ✓ISO 14001:2015
- ✓OHSAS 18001:2007
- ✓PED Certified
- ✓Petrofac Approved
MTC Certified ASTM A193 B7 Washers Manufacturer in India with Black Oxide & PTFE Finish
Specifications Of Alloy Steel B7 Washers
Governing Grade Standard
- ASTM A193 / ASME SA193
- Grade B7 Cr-Mo chemistry
- ASTM F436 hardness on request
- ASTM F844 general-use washers
Alloy Steel B7 Washer Sizes
- Bore sizes M6 to M100
- Inch sizes on request
- ID, OD & thickness to drawing
- Sample-matched production
Washer Dimension Standards
- ISO 7089 / DIN 125
- DIN 9021 / ISO 7093
- ASME B18.21.1
- IS, JIS & BS on request
Manufacturing Route
- Punched from Cr-Mo strip
- Turned on precision lathe
- Hot or cold forged
- Quenched & tempered
Hardness Options
- 35 HRC max, standard B7
- 321 HBW max, standard B7
- 38-45 HRC, F436 style
- Custom hardness on order
Finish Options
- Black oxide, plain or oiled
- PTFE dry-film coating
- Zinc plated or galvanised
- Phosphate on request
Types Of Alloy Steel B7 Washers
Eight key washer styles, all cut or formed from certified B7 chemistry.
Alloy Steel B7 Flat Washer
ISO 7089 / DIN 125
Alloy B7 Lock Washers
DIN 127 B
Alloy B7 Spring Washer
DIN 128 A
B7 AS Conical Washer
DIN 6796
Alloy Steel B7 Fender Washer
DIN 9021 / ISO 7093
B7 Alloy Steel Star Washers
DIN 6798
Alloy Steel B7 Square Washers
DIN 436
B7 AS Spherical Washer
DIN 6319
Alloy Steel B7 Washer Size Chart – M6 To M36
Full B7 mechanical properties apply up to M64. See the grade note below.
| Bolt Size | Inner Dia (ID) mm | Outer Dia (OD) mm | Thickness mm |
|---|---|---|---|
| M6 | 6.4 | 12 | 1.6 |
| M8 | 8.4 | 16 | 1.6 |
| M10 | 10.5 | 20 | 2.0 |
| M12 | 13 | 24 | 2.5 |
| M14 | 15 | 28 | 2.5 |
| M16 | 17 | 30 | 3.0 |
| M18 | 19 | 34 | 3.0 |
| M20 | 21 | 37 | 3.0 |
| M22 | 23 | 39 | 3.0 |
| M24 | 25 | 44 | 4.0 |
| M27 | 28 | 50 | 4.0 |
| M30 | 31 | 56 | 4.0 |
| M36 | 37 | 66 | 5.0 |
Have A Special Washer Drawing?Send the sketch or sample details and get a priced offer.
Buy UNS S41400 Sealing Washers in Size M6 to M100 for Reliable Performance in High-Pressure Piping
Chemical Composition Of ASTM A193 B7 Washers
A premier Alloy Steel B7 Washers supplier in India stocks high-pressure bolting components.
| Element | Grade B7 Range |
|---|---|
| Carbon (C) | 0.38 – 0.48 |
| Manganese (Mn) | 0.75 – 1.00 |
| Phosphorus (P) max | 0.035 |
| Sulfur (S) max | 0.040 |
| Silicon (Si) | 0.15 – 0.35 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
Base Steel Grade
AISI 4140 / 4142
Chromium-molybdenum alloy steel
Werkstoff Number
1.7225
DIN 42CrMo4 equivalent
UNS Designation
G41400
Unified numbering system code
Bar Size Note
0.50% C Max
Bars over 90mm diameter
Mechanical Properties & Hardness Of A193 B7 Washers
| Size Range | Tensile MPa min | Yield MPa min | Elongation % min | Reduction Of Area % min | Hardness max |
|---|---|---|---|---|---|
| Up to M64 (2.5 in) | 860 | 720 | 16 | 50 | 321 HBW / 35 HRC |
| M64 to M100 | 793 | 655 | 16 | 50 | 321 HBW / 35 HRC |
Tensile Strength
≥ 860 MPa
Sizes up to M64
Yield Strength
≥ 720 MPa
0.2 percent offset
Tempering Temperature
593°C Min
Quench and temper route
F436 Washer Hardness
38-45 HRC
Through-hardened, when specified
Monthly Delivery of Alloy Steel B7 Washers in below countries:
| Export to | Continent | Shipping time |
|---|---|---|
 Nigeria |
Africa | 22 Days |
 Indonesia |
Asia | 18 Days |
 Malaysia |
Asia | 10 Days |
 Brazil |
South America | 35-40 Days |
B7 Vs B7M Washers – Choosing The Right Grade
B7 Grade Washer
- General high-temperature and high-pressure bolting
- Tensile 860 MPa min, up to M64
- Hardness 321 HBW or 35 HRC max
- Tempered at 593°C minimum
- Pairs with A194 2H nuts
B7M Grade Washer
- Sour service under NACE MR0175 / ISO 15156
- Tensile 690 MPa min, up to M100
- Hardness 235 HBW or 99 HRB max
- Tempered at 620°C minimum
- Pairs with A194 2HM nuts
Need B7 Or B7M For Sour Service?Share your service and size. We will suggest the right grade.
Manufacturing Process For B7 AS Spherical Washer
Bar Selection
Cr-Mo stock is checked against B7 chemistry limits.
Blank, Punch Or Turn
Washers are formed to your ID, OD and thickness.
Quench In Liquid
Parts are heated and quenched in oil or water.
Temper To Grade
B7 tempers at 593°C minimum for the ordered size.
Hardness Check
Every lot is tested against the hardness limit ordered.
Alloy B7 Spring Washer Finish Options
A dedicated Alloy Steel B7 Washers supplier in India ensures durable joints for pipelines.
Black Oxide
- Dark, low-luster finish
- Light oil retained for cover
- Suits indoor bolted assembly
PTFE Dry-Film
- Low-friction coating
- Eases torque during assembly
- Also aids repeat disassembly
Zinc Plated
- ASTM B633 electroplated zinc
- ASTM F1941 for fasteners
- Thin, clean finish
Hot-Dip Galvanised
- ASTM F2329 for washers
- ASTM A153 for hardware
- Thick outdoor protection
Phosphate & Oil
- Dark, oil-holding surface
- Light corrosion cover
- Good for indoor assembly
Mechanical Zinc
- ASTM B695 coating
- Suits hardened washers
- Thickness class as per order
Plating Hardened B7 Washers?Hydrogen embrittlement control is needed after plating. ASTM F1940 verifies the process.
Equivalent Grades Of Alloy Steel WERKSTOFF NR. 1.7225 B7 Flat Washer
ASTM / UNS / AISI
- ASTM A193 Grade B7
- ASME SA193 B7
- AISI 4140 / 4142
- UNS G41400
JIS
- SCM440
DIN / EN
- 42CrMo4
- WNr 1.7225
- EN 10083-3
Which B7 Washer Style Fits Your Joint ?
Match the washer style to the load, motion or seal you need.
Spread The Load
Alloy Steel B7 Flat Washer and AS B7 Round Washer protect the face.
Cover Oversize Holes
An Alloy Steel B7 Fender Washer has a wide bearing surface.
Fight Vibration
Alloy B7 Lock Washers and an Alloy B7 Spring Washer resist loosening.
Hold Preload
A B7 AS Conical Washer keeps clamp load through heat and vibration.
Grip Soft Faces
B7 Alloy Steel Star Washers bite into softer mating surfaces.
Fix Angle Errors
A B7 AS Spherical Washer with conical seats corrects angled bolt faces.
Adjust The Fit
Alloy Steel B7 Slot Washers allow position shift without full disassembly.
Seal The Joint
UNS S41400 Sealing Washers close leak paths at plugs and fittings.
Bear On Timber
Alloy Steel B7 Square Washers spread the load across timber joints.
Weekly Delivery of Alloy Steel B7 Washers in below countries:
| Export to | Continent | Shipping time |
|---|---|---|
 Saudi Arabia |
Asia | 6 Days |
 Qatar |
Asia | 6 Days |
 UAE |
Asia | 5 Days |
 USA |
North America | 40-60 Days |
Testings Of ASTM A193 B7 Alloy Steel Split Washer
Each batch is checked before it is dispatched from Mumbai.
Hardness Testing
Rockwell or Brinell readings confirm the ordered hardness window.
Spectro Chemical Analysis
Cr, Mo, Mn and C are read against the grade.
PMI Testing
Positive Material Identification confirms the alloy before dispatch.
Mechanical Testing
Tensile and yield values trace back to the parent heat.
Dimensional Inspection
ID, OD and thickness are gauged against your drawing.
Third-Party Inspection
An independent inspector can witness tests and sign the report.
Alloy Steel B7 Flat Washer Documentation & Test Certificates
An Alloy Steel B7 Washers manufacturer in India producing traceable components.
Mill Test Certificate EN 10204 3.1
Chemical and mechanical results linked to the heat
With Supply
EN 10204 3.2 & Third-Party Report
Independent witness of tests, signed by the inspector
On Request
Raw Material Report & Traceability
Bar origin linked to every B7 washer lot
On Request
Heat Treatment Chart
Quench and temper record for the lot supplied
On Request
Packing List & Commercial Invoice
Weights, marks, numbers and HS code included
With Supply
Certificate Of Origin
Customs support, attested through chamber on request
Export Orders
Fumigation Certificate
Issued for wooden pallet dispatches
Export Orders
Need Third-Party Inspection On Your Order?Name your inspection agency and we will plan the visit.
Industries & Applications Using AS B7 Round Washer
Alloy Steel B7 Washers ship into these sectors for bolted piping joints.
Oil & Gas Piping
Petrochemical Plants
Power Generation
Boilers & Heat Exchangers
Chemical Processing
Automotive Assemblies
Aerospace Hardware
Shipbuilding
Fertilizer Plants
Cement Plants
Construction & Heavy Machinery
Valve & Flange Assembly
HSN Code For Alloy Steel B7 Washers
Flat, Fender & Other Washers
7318 22
Other washers of iron or steel
Spring, Lock & Split Washers
7318 21
Spring washers and other lock washers
Tariff Chapter
Chapter 73
Articles of iron or steel
Packing & Export Handling For B7 Washers
Inner Packing
Washers are packed in bins or small boxes as specified.
Corrugated Cartons
Cartons carry size, grade and order marks.
Euro Pallets
Export cartons are stacked on Euro-size wooden pallets.
Pallet Finishing
Pallets get fumigation, stretch wrap, strapping and labels.
Check Out Your Nearby Locations For Fastest Deliveries
| Morocco | Kenya | Gabon | Houston | Dubai | Tunisia |
| Abu Dhabi | South Africa | Nigeria | Mozambique | USA | Oman |
| Saudi Arabia | Riyadh | Dammam | Al-Khobar | UAE | Al Jubail |
| Angola | Ethiopia | Egypt | Zambia | Ghana | Tanzania |
| New South Wales | Indiana | Texas | California | Algeria | Carolina |
Frequently Asked Questions
What is the correct UNS number for Alloy Steel B7 Washers?
The correct code is UNS G41400, matching AISI 4140 / 4142 chemistry. UNS S41400 is a separate martensitic stainless grade.
Do full B7 mechanical properties apply up to M100?
Full B7 properties apply up to M64. Larger sizes to M100 follow the B7M temper route.
Which standard covers B7 Alloy Steel Star Washers dimensions?
ISO 7089 and DIN 125 cover metric sizes. ASME B18.21.1 covers inch sizes.
Can you supply B7 Alloy Steel Star Washers to a custom drawing?
Yes. Send ID, OD, thickness and finish. We punch, turn or forge to match.
What HSN code applies to Alloy Steel B7 Flat Washer?
Flat and other washers fall under HSN 7318 22. Spring and lock washers fall under 7318 21.
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