SS 304 Washers are used with high quality bolts in order to prevent the loss of pre-load after application of torque, caused by brinelling.Washers are often coupled with a threaded fastener or bolt. One of the most commonly used grades of stainless steel is the 304 austenitic variety. The grade 304 Stainless Steel Washers have excellent tensile strength & good resistance to corrosion.
Table of Content
The main reasons for using 304 Stainless Steel Flat Washers include –
Besides these features, the 304 grade is known to have good weldable and formability. Hence, the Type 304 Washer can be manufactured into any desired shape. Washers are typically manufactured in the shape of a disc and have two diameters on account of the inner hole and the outer circumference. While disc shaped washers are pre-dominantly used in various industries, other shapes like square, wave, split, star shaped etc.
A basic metal or plain flat washer ss 304 also known as a ring washer is , often used to spread the load of a screwed fastening. This ss 304 flat washer may also be used in applications where the hole is of a large diameter as opposed to the fixing nut.A star washer 304 is manufactured with serrations that extend radially inward or outward. These serrations bite into the bearing surface. The star washer is more effective when used with a soft substrate like aluminium or plastic. In fact, it tends to work effectively as a lock washer because it can resist rotation in comparison to a plain 304 stainless washer used on a hard surface.
ss 304 spring washer also known as helical or locking washers are used in those applications where the fastener loosening or fastening is required to be prevented during the occurrence of vibrations.
| Specifications of 304 Stainless Steel Washers | ASME SA193 ASTM A193 |
| Standard of 304 Stainless Steel Washers | ASTM, DIN, BS and all International Standards |
| Length of 304 Stainless Steel Washers | M02 to M33 |
| Size of 304 Stainless Steel Washers | 3 mm to 200 mm |
| Type of 304 Stainless Steel Washers | Lock Washer, Flat Washer, Split Washer, Sealing Washer, Machine Washer, Slot Washer, Star Washer SPRINGS – Flat Spring & Wire Spring |
Size |
USS |
SAE |
||||
|---|---|---|---|---|---|---|
Inside Diameter (A) |
Outside Diameter (B) |
Thickness (C) |
Inside Diameter (A) |
Outside Diameter (B) |
Thickness (C) |
|
#2 |
- |
- |
- |
3/32" |
1/4" |
0.020" |
#4 |
- |
- |
- |
1/8" |
5/16" |
0.032" |
#6 |
- |
- |
- |
5/32" |
3/8" |
0.049" |
#8 |
- |
- |
- |
3/16" |
7/16" |
0.049" |
#10 |
- |
- |
- |
7/32" |
1/2" |
0.049" |
#12 |
- |
- |
- |
1/4" |
9/16" |
0.065" |
1/4" |
5/16" |
0.734" |
0.065" |
9/32" |
5/8" |
0.065" |
5/16" |
3/8" |
7/8" |
0.083" |
11/32" |
11/16" |
0.065" |
3/8" |
7/16" |
1" |
0.083" |
13/32" |
13/16" |
0.065" |
7/16" |
1/2" |
1-1/4" |
0.083" |
15/32" |
15/16" |
0.065" |
1/2" |
9/16" |
1-3/8" |
0.109" |
17/32" |
1-1/16" |
0.095" |
9/16" |
5/8" |
1-15/32" |
0.109" |
19/32" |
1-5/32" |
0.095" |
5/8" |
11/16" |
1-3/4" |
0.134" |
21/32" |
1-5/16" |
0.095" |
3/4" |
13/16" |
2" |
0.148" |
13/16" |
1-15/32" |
0.134" |
7/8" |
15/16" |
2-1/4" |
0.165" |
15/16" |
1-3/4" |
0.134" |
1" |
1-1/16" |
2-1/2" |
0.165" |
1-1/16" |
2" |
0.134" |
1-1/8" |
1-1/4" |
2-3/4" |
0.165" |
- |
- |
- |
1-1/4" |
1-3/8" |
3" |
0.165" |
- |
- |
- |
1-3/8" |
1-1/2" |
3-1/4" |
0.180" |
- |
- |
- |
1-1/2" |
1-5/8" |
3-1/2" |
0.180" |
- |
- |
- |
1-5/8" |
1-3/4" |
3-3/4" |
0.180" |
- |
- |
- |
1-3/4" |
1-7/8" |
4" |
0.180" |
- |
- |
- |
2" |
2-1/8" |
4-1/2" |
0.213" |
- |
- |
- |
NOM SIZE |
Inner Dia (d) Basic Tol (+) |
Outer Dia (d1) Max |
WIDTH (b) Basic Tol (+ or -) |
THICKNESS (S) Basic Tol (+ or -) |
Weight per 1000 in Kgs |
|||
3 |
3.1 |
0.3 |
6.2 |
1.3 |
0.1 |
0.8 |
0.1 |
0.11 |
4 |
4.1 |
0.3 |
7.6 |
1.5 |
0.1 |
0.9 |
0.1 |
0.18 |
5 |
5.1 |
0.3 |
9.2 |
1.8 |
0.1 |
1.2 |
0.1 |
0.36 |
6 |
6.1 |
0.4 |
11.8 |
2.5 |
0.15 |
1.6 |
0.1 |
0.83 |
8 |
8.1 |
0.4 |
14.8 |
3 |
0.15 |
2 |
0.1 |
1.60 |
10 |
10.2 |
0.5 |
18.1 |
3.5 |
0.2 |
2.2 |
0.15 |
2.53 |
12 |
12.2 |
0.5 |
21.1 |
4 |
0.2 |
2.5 |
0.15 |
3.82 |
14 |
14.2 |
0.5 |
24.1 |
4.5 |
0.2 |
3 |
0.15 |
6.01 |
16 |
16.2 |
0.8 |
27.4 |
5 |
0.2 |
3.5 |
0.2 |
8.91 |
18 |
18.2 |
0.8 |
29.4 |
5 |
0.2 |
3.5 |
0.2 |
9.73 |
20 |
20.2 |
1 |
33.6 |
6 |
0.2 |
4 |
0.2 |
15.20 |
22 |
22.5 |
1 |
35.9 |
6 |
0.2 |
4 |
0.2 |
16.50 |
24 |
24.5 |
1 |
40 |
7 |
0.25 |
5 |
0.2 |
26.20 |
27 |
27.5 |
1 |
43 |
7 |
0.25 |
5 |
0.2 |
28.70 |
30 |
30.5 |
1.2 |
48.2 |
8 |
0.25 |
6 |
0.2 |
44.30 |
33 |
33.5 |
1.2 |
55.2 |
10 |
0.25 |
6 |
0.2 |
63.00 |
36 |
36.5 |
1.2 |
58.2 |
10 |
0.25 |
6 |
0.2 |
67.30 |
39 |
39.5 |
1.2 |
61.2 |
10 |
0.25 |
6 |
0.2 |
71.70 |
42 |
42.5 |
1.2 |
68.2 |
12 |
0.25 |
7 |
0.25 |
111.00 |
45 |
45.5 |
1.2 |
71.2 |
12 |
0.25 |
7 |
0.25 |
117.00 |
48 |
49 |
1.5 |
75 |
12 |
0.25 |
7 |
0.25 |
123.00 |
52 |
53 |
1.5 |
83 |
14 |
0.25 |
8 |
0.25 |
320.00 |
Bolt Size
|
USS
|
SAE
|
||||
OD (in.)
|
ID (in.)
|
Thickness
|
OD (in.)
|
ID (in.)
|
Thickness
|
|
1/8 (#6)
|
-
|
-
|
-
|
0.375
|
0.156
|
.036/.065
|
5/32 (#8)
|
-
|
-
|
-
|
0.438
|
0.188
|
.036/.065
|
3/16 (#10)
|
0.560
|
0.250
|
.036/.065
|
0.500
|
0.220
|
.036/.065
|
7/32 (#12)
|
-
|
-
|
-
|
0.562
|
0.250
|
.051/.080
|
1/4 (#14)
|
0.734
|
0.312
|
.051/.080
|
0.625
|
0.281
|
.051/.080
|
5/16
|
0.875
|
0.375
|
.064/.104
|
0.688
|
0.344
|
.051/.080
|
3/8
|
1.000
|
0.438
|
.064/.104
|
0.812
|
0.406
|
.051/.080
|
7/16
|
1.250
|
0.500
|
.064/.104
|
0.922
|
0.469
|
.051/.080
|
1/2
|
1.375
|
0.562
|
.086/.132
|
1.062
|
0.531
|
.074/.121
|
9/16
|
1.469
|
0.625
|
.086/.132
|
1.156
|
0.594
|
.074/.121
|
5/8
|
1.750
|
0.688
|
.108/.160
|
1.312
|
0.656
|
.074/.121
|
3/4
|
2.000
|
0.812
|
.122/.177
|
1.469
|
0.812
|
.108/.160
|
7/8
|
2.250
|
0.938
|
.136/.192
|
1.750
|
0.938
|
.108/.160
|
1
|
2.500
|
1.062
|
.136/.192
|
2.000
|
1.062
|
.108/.160
|
1 1/8
|
2.750
|
1.250
|
.136/.192
|
2.250
|
1.250
|
.108/.160
|
1 1/4
|
3.000
|
1.375
|
.136/.192
|
2.500
|
1.375
|
.136/.192
|
1 3/8
|
3.250
|
1.500
|
.153/.213
|
2.750
|
1.500
|
.136/.213
|
1 1/2
|
3.500
|
1.625
|
.153/.213
|
3.000
|
1.625
|
.153/.213
|
1 5/8
|
3.750
|
1.750
|
.153/.213
|
-
|
-
|
-
|
1 3/4
|
4.000
|
1.875
|
.153/.213
|
-
|
-
|
-
|
1 7/8
|
4.250
|
2.000
|
.153/.213
|
-
|
-
|
-
|
2
|
4.500
|
2.125
|
.153/.213
|
-
|
-
|
-
|
2 1/4
|
4.750
|
2.375
|
.320/.248
|
-
|
-
|
-
|
2 1/2
|
5.000
|
2.625
|
.210/.280
|
-
|
-
|
-
|
2 3/4
|
5.250
|
2.875
|
.228/.410S
|
-
|
-
|
-
|
3
|
5.500
|
3.125
|
.249/.327
|
-
|
-
|
-
|
Grade
|
C
|
Mn
|
Si
|
P
|
S
|
Cr
|
Mo
|
Ni
|
N
|
|
304
|
min.
max. |
-
0.08 |
-
2.0 |
-
0.75 |
-
0.045 |
-
0.030 |
18.0
20.0 |
-
|
8.0
10.5 |
-
0.10 |
304L
|
min.
max. |
-
0.030 |
-
2.0 |
-
0.75 |
-
0.045 |
-
0.030 |
18.0
20.0 |
-
|
8.0
12.0 |
-
0.10 |
304H
|
min.
max. |
0.04
0.10 |
-
2.0 |
-
0.75 |
-
0.045 |
-
0.030 |
18.0
20.0 |
-
|
8.0
10.5 |
-
|
AISI Grade Equivalent
|
JIS Equivalent
|
Stainless Steel Notation
|
EN/DIN Numerical Equivalent
|
UNS
designation |
EN/DIN Symbolical Equivalent |
AISI 304
|
SUS304
|
SS 304
|
EN 1.4301
|
UNS S30400
|
X4CrNi18-10 |
AISI 304L
|
SUS304L
|
SS 304L
|
EN 1.4307
|
UNS S30403
|
X2CrNi18-9 |
AISI 304H
|
SUS304H
|
SS 304H
|
EN 1.4948
|
UNS S30409
|
X2CrNiN18-10 |
Grade
|
Tensile Strength (MPa) min
|
Yield Strength 0.2% Proof (MPa) min
|
Elongation (% in 50mm) min
|
Hardness
|
|
Rockwell B (HR B) max
|
Brine-ll (HB) max
|
||||
304 |
515 |
205 |
40 |
92 |
201 |
304L |
485 |
170 |
40 |
92 |
201 |
304H |
515 |
205 |
40 |
92 |
201 |
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion (m/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C (J/kg.K) |
Electrical Resistivity(n.m) |
|||
|---|---|---|---|---|---|---|---|---|---|
0-100°C |
0-315°C |
0-538°C |
at 100°C |
at 500°C |
|||||
304/L/H |
8000 |
193 |
17.2 |
17.8 |
18.4 |
16.2 |
21.5 |
500 |
720 |