|
Washer Manufacturing
Stamped metal washers measure
typically 0.005 to 0.250 in. thick, with
outside diameters to 5 in. Metalforming
companies stamp them on presses from 5 to
200 tons from sheetmetal blanks fed manually
or automatically, or often from coil stock
on progressive dies. Press lines may include
automatic uncoiling, feeding and injection
systems.
Washers can be stamped from
any punchable materials, including spring
steel, carbon steel, stainless steel, brass
and aluminum alloys. Washer designs include
wavy, bowed and slotted. Typical styles
include fender washers (light, medium and
heavy), high-strength structural washers,
U-bolt washers, split-lock styles, dock
washers and automotive body shims. Order
quantities typically start at 100 pieces,
although many suppliers will satisfy special
requests for smaller quantities.
Value-added services offered
by washer manufacturers include flat or
tumble deburring, heattreating and plating
(cadmium, phosphate, mechanical galvanizing
and hot-dip galvanizing). Some washer manufacturers
also offer fully-equipped A2LA laboratories
and meet quality standards for nuclear construction,
MIL-Spec work, and SAE and ANSI specs.
Two types of flat washers
are defined for general use. Type A is a
series of steel washers with broad tolerances,
where design refinement is not important.
They range from No. 6 to 3-in. hole size
and from 3/16 to 5½-in. OD. Type
A washers are satisfactory for most assemblies.
Type B washers are of higher quality and
are specified in Narrow, Regular, and Wide
diameters for each screw size from No. 0
to 3 in. However, many other standard sizes
are available.
Series Designations -- N-Narrow,
R-Regular, W-Wide
American
National Standard (ANSI)
Type B Plain Washers
|
|
Nominal
Size
| Decimal
Equiv. Size
|
Series
|
Inside
Diameter
|
Outside
Diameter
|
Thickness
|
| No.
0
| 0.060"
| N
| 0.0680
| 0.1250
| 0.0250
|
| R
| 0.0680
| 0.1880
| 0.0250
|
| W
| 0.0680
| 0.2500
| 0.0250
|
| No.
1
| 0.073"
| N
| 0.0840
| 0.1560
| 0.0250
|
| R
| 0.0840
| 0.2190
| 0.0250
|
| W
| 0.0840
| 0.2810
| 0.0320
|
| No.
2
| 0.086"
| N
| 0.0940
| 0.1880
| 0.0250
|
| R
| 0.0940
| 0.2500
| 0.0320
|
| W
| 0.0940
| 0.3440
| 0.0320
|
| No.
3
| 0.099"
| N
| 0.1090
| 0.2190
| 0.0250
|
| R
| 0.1090
| 0.3120
| 0.0320
|
| W
| 0.1090
| 0.4060
| 0.0400
|
| No.
4
| 0.112"
| N
| 0.1250
| 0.2500
| 0.0320
|
| R
| 0.1250
| 0.3750
| 0.0400
|
| W
| 0.1250
| 0.4380
| 0.0400
|
| No.
5
| 0.125"
| N
| 0.1410
| 0.2810
| 0.0320
|
| R
| 0.1410
| 0.4060
| 0.0400
|
| W
| 0.1410
| 0.5000
| 0.0400
|
| No.
6
| 0.138"
| N
| 0.1560
| 0.3120
| 0.0320
|
| R
| 0.1560
| 0.4380
| 0.0400
|
| W
| 0.1560
| 0.5620
| 0.0400
|
|
Nominal
Size
| Decimal
Equiv. Size
|
Series
|
Inside
Diameter
|
Outside
Diameter
|
Thickness
|
| No.
8
| 0.164"
| N
| 0.1880
| 0.3750
| 0.0400
|
| R
| 0.1880
| 0.5000
| 0.0400
|
| W
| 0.1880
| 0.6250
| 0.0630
|
| No.
10
| 0.190"
| N
| 0.2030
| 0.4060
| 0.0400
|
| R
| 0.2030
| 0.5620
| 0.0400
|
| W
| 0.2030
| 0.7340
| 0.0630
|
| No.
12
| 0.216"
| N
| 0.2340
| 0.4380
| 0.0400
|
| R
| 0.2340
| 0.6250
| 0.0630
|
| W
| 0.2340
| 0.8750
| 0.0630
|
| .25
| 0.25"
| N
| 0.2810
| 0.5000
| 0.0630
|
| R
| 0.2810
| 0.7340
| 0.0630
|
| W
| 0.2810
| 1.0000
| 0.0630
|
| .3125
| 0.312"
| N
| 0.3440
| 0.6250
| 0.0630
|
| R
| 0.3440
| 0.8750
| 0.0630
|
| W
| 0.3440
| 1.1250
| 0.0630
|
| .375
| 0.375"
| N
| 0.4060
| 0.7340
| 0.0630
|
| R
| 0.4060
| 1.0000
| 0.0630
|
| W
| 0.4060
| 1.2500
| 0.1000
|
| .4375
| 0.438"
| N
| 0.4690
| 0.8750
| 0.0630
|
| R
| 0.4690
| 1.1250
| 0.0630
|
| W
| 0.4690
| 1.4690
| 0.1000
|
|
Nominal
Size
| Decimal
Equiv. Size
|
Series
|
Inside
Diameter
|
Outside
Diameter
|
Thickness
|
| .5
| 0.500"
| N
| 0.5310
| 1.0000
| 0.0630
|
| R
| 0.5310
| 1.2500
| 0.1000
|
| W
| 0.5310
| 1.7500
| 0.1000
|
| .5625
| 0.562"
| N
| 0.5940
| 1.1250
| 0.0630
|
| R
| 0.5940
| 1.4690
| 0.1000
|
| W
| 0.5940
| 2.0000
| 0.1000
|
| .625
| 0.625"
| N
| 0.6560
| 1.2500
| 0.1000
|
| R
| 0.6560
| 1.7500
| 0.1000
|
| W
| 0.6560
| 2.2500
| 0.1600
|
| .75
| 0.750"
| N
| 0.8120
| 1.3750
| 0.1000
|
| R
| 0.8120
| 2.0000
| 0.1000
|
| W
| 0.8120
| 2.5000
| 0.1600
|
| .875
| 0.875"
| N
| 0.9380
| 1.4690
| 0.1000
|
| R
| 0.9380
| 2.2500
| 0.1600
|
| W
| 0.9380
| 2.7500
| 0.1600
|
| 1
| 1.000"
| N
| 1.0620
| 1.7500
| 0.1000
|
| R
| 1.0620
| 2.5000
| 0.1600
|
| W
| 1.0620
| 3.0000
| 0.1600
|
| 1.125
| 1.125"
| N
| 1.1880
| 2.0000
| 0.1000
|
| R
| 1.1880
| 2.7500
| 0.1600
|
| W
| 1.1880
| 3.2500
| 0.1600
|
|
Nominal
Size
| Decimal
Equiv. Size
|
Series
|
Inside
Diameter
|
Outside
Diameter
|
Thickness
|
| 1.25
| 1.250"
| N
| 1.3120
| 2.2500
| 0.1600
|
| R
| 1.3120
| 3.0000
| 0.1600
|
| W
| 1.3120
| 3.5000
| 0.2500
|
| 1.375
| 1.375"
| N
| 1.4380
| 2.5000
| 0.1600
|
| R
| 1.4380
| 3.2500
| 0.1600
|
| W
| 1.4380
| 3.7500
| 0.2500
|
| 1.5
| 1.500"
| N
| 1.5620
| 2.7500
| 0.1600
|
| R
| 1.5620
| 3.5000
| 0.2500
|
| W
| 1.5620
| 4.0000
| 0.2500
|
| 1.625
| 1.625"
| N
| 1.7500
| 3.0000
| 0.1600
|
| R
| 1.7500
| 3.7500
| 0.2500
|
| W
| 1.7500
| 4.2500
| 0.2500
|
| 1.75
| 1.750"
| N
| 1.8750
| 3.2500
| 0.1600
|
| R
| 1.8750
| 4.0000
| 0.2500
|
| W
| 1.8750
| 4.5000
| 0.2500
|
| 1.875
| 1.875"
| N
| 2.0000
| 3.5000
| 0.2500
|
| R
| 2.0000
| 4.2500
| 0.2500
|
| W
| 2.0000
| 4.7500
| 0.2500
|
| 2
| 2.000"
| N
| 2.1250
| 3.7500
| 0.2500
|
| R
| 2.1250
| 4.5000
| 0.2500
|
| W
| 2.1250
| 5.0000
| 0.2500
|
|
Nominal
Size
| Decimal
Equiv. Size
|
Series
|
Inside
Diameter
|
Outside
Diameter
|
Thickness
|
| 2.25
| 2.250"
| N
| 2.3750
| 4.0000
| 0.2500
|
| R
| 2.3750
| 5.0000
| 0.2500
|
| W
| 2.3750
| 5.5000
| 0.3750
|
| 2.5
| 2.500"
| N
| 2.6250
| 4.5000
| 0.2500
|
| R
| 2.6250
| 5.5000
| 0.3750
|
| W
| 2.6250
| 6.0000
| 0.3750
|
| 2.75
| 2.750"
| N
| 2.8750
| 5.0000
| 0.2500
|
| R
| 2.8750
| 6.0000
| 0.3750
|
| W
| 2.8750
| 6.5000
| 0.3750
|
| 3
| 3.000"
| N
| 3.1250
| 5.5000
| 0.3750
|
| R
| 3.1250
| 6.5000
| 0.3750
|
|
W
|
3.1250
| 7.0000
|
0.3750
|
N-Narrow, R-Regular, W-Wide
|
