Why Marine & Chemical Buyers Choose Ganpat Industrial For SS 316 Flat & Lock Washers ?

2–3% Molybdenum Heats

Where 304 grade pits, 316 grade holds — mill-certified every batch

One Enquiry, Full Range

Flat • Lock • Spring • Sealing — all in one PO

Chloride & Marine Certified

ISO 9001 • PED • NACE MR0175 heats on request

Zero Inspection Surprises

PMI • salt spray • dimensional — before it ships

Quote In 24 Hours

Ready stock on standard sizes — ships same week

316 Stainless Steel Washer Highlights

1Type: Flat, Lock, Spring, Sealing, Conical, Fender, Plain, Square, Machine, Star, Slot
2Size Range: M2 to M36 • OD 5 mm to 66 mm
3Common Grades: UNS S31600, EN 1.4401, AISI 316, Werkstoff Nr. 1.4401
4Standards: ASTM A193, ASME B18.22.1, DIN 125, DIN 127, ISO 7089, ISO 3506
5Origin: Indian origin • Japanese origin • European origin
6Finish: Bright Annealed, Passivated, Polished, Natural Mill Finish

Stainless Steel 316 Washer Specification

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Stainless Steel 316 Washers carry 2–3% molybdenum — the one element that stops chloride pitting where 304 grade rings begin to fail. Ganpat Industrial forges every UNS S31600 / EN 1.4401 washer in-house and ships tested, documented stock to marine, desalination, chemical and coastal-construction buyers across India, the UAE and the Middle East.

Mumbai · Stainless Steel 316 Washers Manufacturer India

316 Grade Washers Built To Beat Chlorides, Not Just Meet Spec

Ganpat Industrial forges and supplies UNS S31600 / EN 1.4401 Washers for buyers who cannot risk pitting or crevice corrosion — marine decks, desalination plants, pool equipment and coastal structures across India, the UAE and the Middle East.

✓ISO 9001:2015
✓ISO 14001:2015
✓OHSAS 18001:2007
✓PED Certified
✓Petrofac Approved

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Manufacturer & Supplier Of EN 1.4401 Flat & Spring Washers As Per ASME Standards

Stainless Steel 316 Washers Specification

We are a reliable Stainless Steel 316 Washers Supplier In India, offering complete specification details

SS 316 Plain Washer Material

UNS S31600
EN 1.4401
AISI 316
ASTM A193 Grade B8M

UNS S31600 Conical Washer Size Range

ID: M2 – M36
OD: 5 – 66 mm
Thickness: 0.3 – 6 mm
Custom sizes on drawing

SS 316 Flat Washer Testing

PMI Testing
Salt Spray 96 Hrs
Dimensional Check
Third-Party Inspection

316 Grade Lock Washer Finish

Bright Annealed
Passivated (ASTM A967)
Polished
Natural Mill Finish

SS 316 Spring Washer Documentation

Mill Test Certificate 3.1
NABL Lab Report
Packing List
Certificate Of Origin

Stainless Steel 316 Fender Washer Origin

Indian Origin
Japanese Origin
European Origin
Heat-Number Traceable

PED Approved AISI 316 Washers Manufacturer In India with ISO Certified and Custom Sizes as per Drawing

ASTM A193 Plain Washer Size

Bolt Size mm	d2 H14 mm	d1 H14 mm	h max 1 mm	s3 mm	Flattening Force N	Residual Spring Force N
3 4	7	3.2	0.85	0.6	2350	–
2.5 4	6	2.7	0.72	0.5	1540	–
4	9	4.3	1.30	1.0	4050	1400
3.5 4	8	3.7	1.06	0.8	3160	–
6	14	6.4	2.00	1.5	9400	4200
5	11	5.3	1.55	1.2	6700	2300
2 4	5	2.2	0.60	0.4	920	–
8	18	8.4	2.60	2.0	17200	7700
7	17	7.4	2.30	1.75	13700	6200
12	29	13	3.95	3.0	40000	18000
10	23	10.5	3.20	2.5	27500	12400
16	39	17	5.25	4.0	75000	34000
14	35	15	4.65	3.5	55000	25000
20	45	21	6.40	5.0	122000	73000
18	42	19	5.80	4.5	95000	57000
24	56	25	7.75	6.0	175000	122000
22	49	23	7.05	5.5	152000	91000
30	70	31	9.20	7.0	280000	196000
27	60	28	8.35	6.5	230000	161000

Chemical Composition Of Stainless Steel 316 Flat Washer

We are a trusted Stainless Steel 316 Washers Manufacturer In India, maintaining precise chemical composition for every heat

ChromiumCr

16.00–18.00%

NickelNi

10.00–14.00%

MolybdenumMo

2.00–3.00%

CarbonC

≤ 0.08%

IronFe

Balance

Mechanical Properties Of INOX 316 Plain Washer

Tensile Strength

515 MPa Min

ASTM A193 B8M

Yield Strength

205 MPa Min

0.2% Proof Stress

Hardness

≤ 223 HB

96 HRB Max

Elongation

40% Min

In 50 mm Gauge

AISI 316 Conical Washer Equivalent Standards

American Standard

UNS S31600
ASTM A193 Grade B8M
ASME B18.22.1

European Standard

EN 1.4401
DIN 125 / DIN 127
ISO 7089 / ISO 3506

Japanese Standard

SUS316
JIS B 1256
JIS G 4303

Need Mill-Certified 316 Sealing & Fender Washers On Short Notice?Share size & quantity — get factory price with MTC 3.1 in 24 hours.

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Types Of Stainless Steel 316 Washers

UNS S31600 Flat Washer

DIN 125A

ASTM A193 Lock Washer

DIN 127B

EN 1.4401 Spring Washer

DIN 128

AISI 316 Conical Washer

DIN 6796

SS 316 Sealing Washer

Bonded Seal

EN 1.4401 Fender Washer

USS Fender

ASTM A193 Plain Washer

ISO 7089

INOX 316 Square Washer

DIN 436

AISI 316 Machine Bush Washer

Custom Drawing

UNS S31600 Toothed Star Washer

DIN 6797

EN 1.4401 Slotted Washer

Custom Drawing

SS 316 Split Lock Washer

DIN 127A

EN 1.4401 Spring Washer Manufacturing Process

Raw Material & MTC Check

Incoming UNS S31600 coil verified against Mill Test Certificate 3.1

Coil Slitting & Blanking

Strip slit to width, blanked into rough washer discs

Precision Piercing

ID hole punched to tolerance on CNC power press tooling

Deburring & Edge Finish

Edges rounded for smooth bolt seating

Passivation (ASTM A967)

Acid-passivated to restore chromium oxide film for corrosion resistance

Inspection & Packing

PMI & dimensional check, then export-ready packing

SS 316 vs SS 304 Square Washer

SS 304 vs SS 316 Square Washer — Key Parameters
Parameter	SS 304 Square Washer	SS 316 Square Washer
Molybdenum Content	0%	2–3%
Nickel Content	8–10.5%	10–14%
PREN (Pitting Resistance)	≈ 18	≈ 24
Salt Spray Life (To Red Rust)	≈ 200 Hrs	≈ 500+ Hrs
Max Recommended Chloride Exposure	≈ 200 ppm	≈ 1000 ppm
Relative Cost Index (304 = 100)	100	≈ 135

AISI 316 Flat Washer Weight Chart

Size	Weight
M2	0.037
M1.7	0.031
M2.5	0.088
M1.6	0.024
M2.3	0.092
M3	0.119
M2.6	0.127
M4	0.308
M3.5	0.155
M6	1.02
M5	0.443
M8	1.83
M7	1.39
M12	6.27
M10	3.57
M16	11.3
M14	8.62
M20	17.2
M18	14.7
M24	32.3
M22	18.3
M27	42.3
M26	43.7
M30	53.6
M28	40.9
M33	75.3
M32	77.4
M36	92.1
M35	94.3
M39	133
M38	136
M42	183
M40	130
M48	294
M45	220
M52	330
M50	284
M56	425
M55	431
M60	458
M58	472
M68	586
M64	492
M76	749
M72	626

What Actually Moves The Price

• Size & Thickness

• Finish (Bright / Passivated / Polished)

• Quantity (Trial Lot vs FCL)

• Testing & Certification Level

SS 316 Flat Washer PriceQuoted per kg or per 1000 pcs, factory-direct, no trader markup.

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UNS S31600 Sealing Washer HSN Code

For Your Purchase Order & E-Way Bill

HSN Code

7318.22.00

Other Washers, Iron/Steel

GST Rate

18%

Applicable On Domestic Sale

Basic Customs Duty

≈ 7.5%

Indicative — verify current tariff on import

Export Benefit

RoDTEP Eligible

Duty drawback available on export orders

SS 316 Flat Washers Delivered Weekly to the Following Countries

Countries	Continent	Ports	Shipping time
Malaysia	Asia	Johor Port	10
Saudi Arabia	Asia	Jubail	7
Vietnam	Asia	Saigon Port	10

Monthly Delivery of Stainless Steel 316 Washers to Below Countries

Export to	Countries	Continent	Ports	Shipping time
		South America	Rio de Janeiro	45-60
	Philipines	Asia	Cagayan de Oro	14

UNS S31600 Spring Washer Test Certificates

PED2014/68/EU

PED 2014/68/EU Pressure Equipment Certificate

Available on request for SS 316 washers supplied into pressure-retaining joints — covers material conformity for pressure equipment directive projects.

Applicable OnPressure Joint Duty Orders

StandardPED 2014/68/EU

Issued ByNotified Body On Request

INOX 316 Washer Inspection

PMI Testing

Positive Material Identification on every heat

Salt Spray Test

96-hour ASTM B117 chloride exposure check

Dimensional & Visual

OD, ID, thickness & surface checked per lot

Buying In Bulk For A Marine Or Chemical Project?Send your BOQ — factory price, MTC 3.1, dispatch same week.

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SS 316 Lock Washer Export Packaging

Poly Bag & Carton

Standard retail-ready packing for trial orders

Wooden Pallet Box

For container-load shipments

VCI Moisture Barrier Pack

Prevents surface staining on long sea-transit

Custom Labelling

heat number marked per buyer requirement

AISI 316 Washer Installation Process

Match Washer ID To Bolt Size

Confirm washer inner diameter fits the stud

Step 1

Clean The Mating Surface

Remove weld splatter, paint or rust from the joint

Step 2

Position The Washer Correctly

Flat/plain under the nut, sealing washer facing the bore, lock washer under the head

Step 3

Apply Anti-Seize On Threads

Use anti-galling on SS 316 bolt threads before tightening

Step 4

Torque To Specification

Tighten evenly in a cross pattern; avoid over-compressing

Step 5

Re-Check After Settling

Re-torque after initial load settling and log the reading for QA

Step 6

Application Of Stainless Steel 316 Fender Washers

We are a reliable Stainless Steel 316 Washers Supplier In India for marine and chemical application

Marine & Shipbuilding

Desalination Plants

Offshore Oil & Gas

Swimming Pool & Spa Equipment

Coastal & Structural Construction

Chemical & Petrochemical Plants

Pharma & Biotech Skids

Pump & Valve Assembly (Seawater Duty)

Frequently Asked Questions

Is an SS 316 Plain Washer magnetic?

SS 316 Plain Washer is essentially non-magnetic

What makes SS 316 different from SS 304?

molybdenum Can Make SS 316 Different Form SS 304 Which Gives Better Resistance to Chloride Pitting

Can SS 316 Fender Washers be used in seawater?

Yes 316 grade is the standard choice for Seawater

Our Dealers and Distributors in Below Continent

Continents	Country
Africa	Nigeria, Egypt, Ethiopia,South Africa, Kenya, Ghana
South America	Colombia, Chile, Peru, Brazil, Argentina
Australia	New Zealand,Fiji, Samoa,Papua New Guinea
Asia	India, Indonesia, Saudi Arabia, Iran,Japan, South Korea
North America	United States, Mexico, Cuba, Canada,
Europe	UK, Italy,Germany, France, Spain, Poland, Ukraine

Stainless Steel 316 Washers