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Page 1

Washers

173

Machine ScrewSteel &Stainless

ID OD

TH

MACHINE SCREW WASHERS

Washer Size
Inside Diameter Outside Diameter Thickness

Max Min Max Min Max Min

2 0.097 0.087 0.224 0.214 0.022 0.014

3 0.114 0.104 0.255 0.245 0.023 0.018

4 0.130 0.120 0.286 0.276 0.030 0.022

5 0.145 0.135 0.286 0.276 0.030 0.022

6 0.155 0.145 0.380 0.370 0.036 0.028

8 0.175 0.165 0.380 0.370 0.036 0.028

10 0.209 0.199 0.443 0.433 0.036 0.028

12 0.232 0.222 0.505 0.495 0.052 0.044

14 0.270 0.260 0.567 0.557 0.052 0.044

5/16 0.335 0.325 0.630 0.620 0.054 0.046

3/8 0.397 0.387 0.693 0.683 0.054 0.046

Description The smallest type of flat washer with an outside diameter equal to slightly twice the size of the inside diameter.

Applications/
Advantages

Designed for use with machine screws in general industrial applications.

Material
Steel Stainless

Washers are punched from cold-rolled steel. 18-8 Stainless steel

Plating See Appendix-A for plating information.
Stainless machine screw washers are usually furnished without

any additional coating.

Page 2

Washers

167

SAE FlatLow Carbon
Steel

ID OD

GA
TH

SAE LOW CARBON WASHERS ANSI B18.22.1

Bolt Size

Outside Diameter Inside Diameter Thickness
Approximate
Number per
50 PoundsNominal Max Min Nominal Max Min

American
Standard
(Gauge)

Max Min

4 5/16 0.320 0.307 1/8 0.133 0.120 (1/32) .040 .025 83300

6 3/8 0.390 0.370 5/32 0.164 0.151 18 (3/64) .065 .036 39500

8 7/16 0.453 0.433 3/16 0.196 0.183 18 (3/64) .065 .036 29500

10 1/2 0.515 0.495 7/32 0.227 0.214 18 (3/64) .065 .036 22750

3/16 9/16 0.577 0.557 1/4 0.265 0.245 18 (3/64) .065 .036

12 9/16 0.577 0.557 1/4 0.265 0.245 16 (1/16) .080 .051 14700

1/4 5/8 0.640 0.620 9/32 0.296 0.276 16 (1/16) .080 .051 11100

5/16 11/16 0.703 0.681 11/32 0.359 0.339 16 (1/16) .080 .051 9750

3/8 13/16 0.827 0.805 13/32 0.419 0.401 16 (1/16) .080 .051 7000

7/16 59/64 0.937 0.915 15/32 0.484 0.464 16 (1/16) .080 .051 5500

1/2 1-1/16 1.092 1.055 17/32 0.546 0.526 13 (3/32) .121 .074 2800

9/16 1-3/16 1.186 1.149 19/32 0.609 0.589 13 (3/32) .121 .074 2250

5/8 1-5/16 1.342 1.305 21/32 0.686 0.649 13 (3/32) .121 .074 1850

3/4 1-1/2 1.499 1.462 13/16 0.842 0.805 10 (9/64) .160 .108 1050

7/8 1-3/4 1.780 1.743 15/16 0.968 0.931 10 (9/64) .160 .108 775

1 2 2.030 1.993 1-1/16 1.092 1.055 10 (9/64) .160 .108 585

1-1/8 2-1/4 2.280 2.243 1-3/16 1.280 1.243 10 (9/64) .160 .108 460

1-1/4 2-1/2 2.530 2.493 1-5/16 1.405 1.368 9 (5/32) .192 .136 335

1-3/8 2-3/4 2.780 2.743 1-7/16 1.530 1.493 9 (5/32) .213 .136 275

1-1/2 3 3.030 2.993 1-9/16 1.655 1.618 9 (5/32) .213 .153 230

Description
Similar to a USS washer, but with slightly smaller inside and outside diameters. Also, most but not all SAE washers are made from

thinner materials than USS washers.

Applications/
Advantages

SAE washers were designed to serve similar purposes as the USS washers, but specifically to meet the requirements in the field of
automotive engineering.

Material
Plain washers shall be punched from hot-rolled, hot-rolled and pickled, or cold-rolled steel, or shall be machined from bar stock or

tubing, or may be forged at the manufacturer's option.

Plating See Appendix-A for information about the plating of steel flat washers.

Page 3

Washers

169

ID OD

GA
TH

x

SAE Through-HardenedFlat

*

*Product standards require all through-hardened washers 1/4” diameter and larger to bear the insignia identifying its manufacturer. “X” represents one location
such an insignia may appear.

Description
Dimensionally equivalent to the low carbon SAE flat washer counterparts, but with tighter tolerances on thickness, manufactured

from a higher grade of steel and heat-treated.

Applications/
Advantages

Designed to perform the same functions as low carbon SAE flat washers, but for use specifically with high-strength hardened steel
bolts.

Material SAE 1035 - 1050 steel

Hardness Rockwell C38 - 45

Plating See Appendix-A for information about the plating of through-hardened flat washers.

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6 8/3 093.0 073.0 23/5 461.0 151.0 560. 630. 00593

8 61/7 354.0 334.0 61/3 691.0 381.0 560. 630. 00592

01 2/1 515.0 594.0 23/7 722.0 412.0 560. 630. 05722

21 61/9 775.0 755.0 4/1 562.0 542.0 080. 150. 00741

4/1 8/5 046.0 026.0 23/9 692.0 672.0 270. 550. 00001

61/5 61/11 307.0 186.0 23/11 953.0 933.0 270. 550. 00001

8/3 61/31 728.0 508.0 23/31 914.0 104.0 270. 550. 0007

61/7 46/95 739.0 519.0 23/51 484.0 464.0 270. 550. 0005

2/1 61/1-1 290.1 550.1 23/71 645.0 625.0 121. 790. 5242

61/9 61/3-1 681.1 941.1 23/91 906.0 985.0 121. 790. 0522

8/5 61/5-1 243.1 503.1 23/12 686.0 946.0 641. 221. 0431

4/3 23/51-1 994.1 264.1 61/31 248.0 508.0 641. 221. 0211

8/7 4/3-1 087.1 347.1 61/51 869.0 139.0 061. 631. 596

1 2 030.2 399.1 61/1-1 290.1 550.1 061. 631. 555

8/1-1 4/1-2 082.2 342.2 4/1-1 082.1 342.1 061. 631. 534

4/1-1 2/1-2 035.2 394.2 8/3-1 504.1 863.1 061. 631. 053

2/1-1 3 030.3 399.2 8/5-1 556.1 816.1 061. 631. 042

4/3-1 8/3-3 504.3 863.3 8/7-1 509.1 868.1 102. 871. 051

2 4/3-3 087.3 847.3 8/1-2 551.2 811.2 102. 871. 521

Page 4

Washers USS Flat Low Carbon
Steel

ID OD

GA
TH

Description A thin, flat, circular steel part with a centrally located hole.

Applications/
Advantages

Washers are designed for assembly around a bolt or screw, between the bearing surface of the fastener and the part to which it is
attached. Flat washers are used to improve stress distribution, and to span large clearance holes. USS washers are designed to

meet the majority of industrial applications in manufacturing, maintenance and repair.

Material
Plain washers shall be punched from hot-rolled, hot-rolled and pickled, or cold-rolled steel, or shall be machined from bar stock or

tubing, or may be forged at the manufacturer's option.

Plating See Appendix-A for information about the plating of low carbon flat washers.

USS LOW CARBON WASHERS ANSI B18.22.1

Bolt Size

Outside Diameter Inside Diameter Thickness
Approximate

Number per 50
PoundsNominal Max Min Nominal Max Min

American
Standard
(Gauge)

Max Min

3/16 9/16 0.577 0.557 1/4 0.265 0.245 18 (3/64) .065 .036 18050

1/4 3/4 0.749 0.727 5/16 0.327 0.307 16 (1/16) .080 .051 7450

5/16 7/8 0.905 0.868 3/8 0.390 0.370 14 (5/64) .104 .064 4350

3/8 1 1.030 0.993 7/16 0.453 0.433 14 (5/64) .104 .064 3350

7/16 1-1/4 1.280 1.243 1/2 0.515 0.495 14 (5/64) .104 .064 2050

1/2 1-3/8 1.405 1.368 9/16 0.577 0.557 12 (7/64) .132 .086 1300

9/16 1-1/2 1.499 1.462 5/8 0.640 0.620 21 (7/64) .132 .086 1100

5/8 1-3/4 1.780 1.743 11/16 0.718 0.681 10 (9/64) .160 .108 650

3/4 2 2.030 1.993 13/16 0.842 0.805 9 (5/32) .177 .122 455

7/8 2-1/4 2.280 2.243 15/16 0.968 0.931 8 (11/64) .192 .136 325

1 2-1/2 2.530 2.493 1-1/16 1.092 1.055 8 (11/64) .192 .136 265

1-1/8 2-3/4 2.780 2.743 1-1/4 1.280 1.243 8 (11/64) .192 .136 225

1-1/4 3 3.030 2.993 1-3/8 1.405 1.368 8 (11/64) .192 .136 190

1-3/8 3-1/4 3.295 3.240 1-1/2 1.545 1.490 7 (3/16) .213 .153 150

1-1/2 3-1/2 3.545 3.490 1-5/8 1.670 1.615 7 (3/16) .213 .153 130
1-5/8 3-3/4 3.795 3.740 1-3/4 1.795 1.740 7 (3/16) .213 .153 115

1-3/4 4 4.045 3.990 1-7/8 1.920 1.865 7 (3/16) .213 .153 100

1-7/8 4-1/4 4.295 4.240 2 2.045 1.990 7 (3/16) .213 .153 90

2 4-1/2 4.545 4.490 2-1/8 2.170 2.115 7 (3/16) .213 .153 79

2-1/4 4-3/4 4.795 4.740 2-3/8 2.420 2.365 5 (7/32) .248 .193 60

2-1/2 5 5.045 4.990 2-5/8 2.670 2.615 4 (15/64) .280 .210 52

2-3/4 5-1/4 5.315 5.240 2-7/8 2.940 2.865 3 (1/4) .310 .228 45

3 5-1/2 5.565 5.490 3-1/8 3.190 3.115 2 (5/32) .327 .249 43

Page 5

Washers

ID OD

GA
TH

x

USS Through-Hardened Flat

*

*Product standards require all through-hardened washers 1/4Ó diameter and larger to bear the insignia identifying its manufacturer. ÒXÓ represents one location
such an insignia may appear.

USS THROUGH-HARDENED FLAT WASHERS ANSI B18.22.1,Wrought Washer

Bolt Size
Outside Diameter Inside Diameter Thickness Approximate

Number per 50
PoundsNominal Max Min Nominal Max Min Max Min

1/4 3/4 0.749 0.727 5/16 0.327 0.307 .072 .055 7500

5/16 7/8 0.905 0.868 3/8 0.390 0.370 .080 .064 5000

3/8 1 1.030 0.993 7/16 0.453 0.433 .080 .064 3500

7/16 1-1/4 1.280 1.243 1/2 0.515 0.495 .080 .064 2500

1/2 1-3/8 1.405 1.368 9/16 0.577 0.557 .121 .097 1500

9/16 1-1/2 1.499 1.462 5/8 0.640 0.620 .121 .097 1100

5/8 1-3/4 1.780 1.743 21/32 0.687 0.649 .146 .122 700

3/4 2 2.030 1.993 13/16 0.842 0.805 .146 .122 500

7/8 2-1/4 2.280 2.243 15/16 0.968 0.931 .160 .136 350

1 2-1/2 2.530 2.493 1-1/16 1.092 1.055 .160 .136 300

1-1/8 2-3/4 2.780 2.743 1-1/4 1.280 1.243 .160 .136 250

1-1/4 3 3.030 2.993 1-3/8 1.405 1.368 .160 .136 200

1-1/2 3-1/2 3.545 3.490 1-5/8 1.670 1.615 .160 .136 150

Description
Dimensionally similar to the USS plain washer counterparts, but with tighter tolerances on thickness, manufactured from a higher

grade of steel and heat-treated.

Applications/
Advantages

Designed to perform the same functions as USS plain washers, but for use specifically with high-strength hardened steel bolts.

Material SAE 1035 - 1050 steel

Hardness Rockwell C38 - 45

Plating See Appendix-A for information about the plating of through-hardened flat washers.

Page 6

Washers Standard Flat 18-8 Stainless
Steel

ID OD

TH

Description A thin, flat, circular stamping with a centrally located hole, made from an 18-8 austenitic stainless steel.

Applications/
Advantages

Designed for use with 18-8 stainless steel screws and nuts in general industrial applications where parts are subject to corrosion.

Material 18-8 stainless steel

STANDARD FLAT WASHERS - 18-8 STAINLESS STEEL

Size

OD ID TH

Outside Diameter Inside Diameter Thickness

Nominal Nominal Nominal

4 .312 .125 .031

6 .375 .156 .031

8 .375 .172 .031

10 .438 .203 .031

1/4 .625 .281 .050

5/16 .750 .344 .050

3/8 .875 .391 .050

3/8 1.000 .391 .062

7/16 1.125 .500 .050

1/2 1.250 .562 .055 - .062

5/8 1.500 .688 .062

3/4 1.750 .812 .075

7/8 2.000 .938 .095 - .109

1 2.000 1.062 .095 - .109

Page 7

WashersStandard Flat316 StainlessSteel

ID OD

TH

Description A thin, flat, circular stamping with a centrally located hole, made from a 316 austenitic stainless steel.

Applications/
Advantages

Designed for use with 316 stainless steel screws and nuts in general industrial applications where parts are subject to corrosion.

Material 316 stainless steel

COMMERCIAL FLAT WASHERS - 316 STAINLESS STEEL

Size

OD ID TH

Outside Diameter Inside Diameter Thickness

Nominal Nominal Nominal

1/4 .625 .281 .045

1/4 .688 .281 .045

5/16 .750 .344 .045

3/8 .875 .406 .045

3/8 1.000 .406 .045

1/2 1.250 .531 .055

5/8 1.500 .688 .075

3/4 1.750 .812 .075

7/8 2.000 .938 .095

7/8 2.250 .938 .105

1 2.000 1.062 .095

1 2.500 1.062 .105

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