China machining solutions provider: www.machinedsgn.com | Email: [email protected]Tel: +8618267732328

Spring Washer

Size: 3/8”-4”, M6-M100
Material: Special Alloy, Super Duplex Stainless Steel, Stainless Steel, Carbon Steel, Titanium
Standard: ANSI/ASME B18.22.1, DIN127

  • PRODUCT DETAIL
  • Material

Standard: ANSI/ASME B18.22.1, DIN127
Size: 3/8″ – 4″, M6-M100
Material: Hastelloy, Monel, Nickel, Inconel, Incoloy, Duplex, Superalloy, Austenitic Stainless steel 
Heat Treatment: Solution and Aging

What is a spring washer?

The spring washer is installed under the nut to prevent the nut from loosening. Spring washer is widely used in load-bearing and non load-bearing structures of general mechanical products. It is characterized by low cost and convenient installation. It is suitable for parts with frequent assembly and disassembly.
Spring washers are used to prevent looseness. For example, the bolts connecting the motor and the base generally need spring pads, because the motor vibrates. If there is no spring pad, the nut will loosen. Generally, the fasteners on the equipment with vibration are equipped with spring pads.
Locking principle of spring washer
The anti loosening principle of the spring washer is that after the spring washer is flattened, the spring washer will produce a continuous elastic force, so that the threaded connection pair of the nut and the bolt can maintain a friction force and produce a resistance torque to prevent the nut from loosening. At the same time, the sharp corners at the opening of the spring washer are respectively embedded in the surface of the bolt and the connected part, so as to prevent the bolt from rotating relative to the connected part.
Design of spring washer
In terms of design idea, the spring washer (also known as spring washer) has pre tension and will rebound after being compressed. In practical use, due to the characteristics of the thread, the nut is easy to rotate along the direction of the screw after tightening, resulting in the loosening of the nut. Spring washers appeared early to solve this problem. Due to the pre tension of the spring washer, after the nut compresses the spring washer, under the action of the pre tension, the triangular buckle in the nut and one side of the triangular buckle of the bolt will stick closely together. Under the action of friction, the nut will no longer be loose. The ordinary washer (also known as round hole gasket or flat gasket or ordinary gasket) is a support under the pre tension of the spring washer, which increases the pressing area of the pre tension of the spring washer. Generally speaking, spring washer and ordinary washer are used together, and it is unreasonable to use ordinary washer alone. Of course, the design and actual needs of individual uses are not excluded. For example, when the plastic shell of an electrical appliance is screwed with self tapping screws, the single ordinary washer below is only to increase the stress area.

International standard for spring washers

Spring washer dimensions chart for regular standard helical spring-lock washers according to ASME B18.21.1 “Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series) ” standard.

HelicalSpringLockWasher - Spring Washer

Nominal Size
(Nominal Thread dia., d)
Inside Dia. A Max. Outside Dia. Min.
Mean
Section
Thickness
(ti + to)/2
Min.  Section Width Min. Bearing Width
max. min. B T W BW
No.2 (0.086) 0.094 0.088 0.172 0.020 0.035 0.024
No.3 (0.099) 0.107 0.101 0.195 0.025 0.040 0.028
No.4  (0.112) 0.120 0.114 0.209 0.025 0.040 0.028
No.5 (0.125) 0.133 0.127 0.236 0.031 0.047 0.033
No.6 (0.138) 0.148 0.141 0.250 0.031 0.047 0.033
No.8 (0.164) 0.174 0.167 0.293 0.040 0.055 0.038
No.10 (0.190) 0.200 0.193 0.334 0.047 0.062 0.043
No.12 (0.216) 0.227 0.220 0.377 0.056 0.070 0.049
1/4 (0.250) 0.260 0.252 0.487 0.062 0.109 0.076
5/16 (0.3125) 0.322 0.314 0.583 0.078 0.125 0.087
3/8 (0.375) 0.385 0.377 0.680 0.094 0.141 0.099
7/16 (0.4375) 0.450 0.440 0.776 0.109 0.156 0.109
1/2 (0.500) 0.512 0.502 0.869 0.125 0.171 0.120
9/16 (0.5625) 0.574 0.564 0.965 0.141 0.188 0.132
5/8 (0.625) 0.641 0.628 1.073 0.156 0.203 0.142
11/16 (0.6875) 0.704 0.691 1.170 0.172 0.219 0.153
3/4 (0.750) 0.766 0.753 1.265 0.188 0.234 0.164
13/16 (0.8125) 0.832 0.816 1.363 0.203 0.250 0.175
7/8 (0.875) 0.894 0.878 1.459 0.219 0.266 0.186
15/16 (0.9375) 0.958 0.941 1.556 0.234 0.281 0.197
1 (1.000) 1.024 1.003 1.656 0.250 0.297 0.208
1 1/16 (1.0625) 1.087 1.066 1.751 0.266 0.312 0.218
1 1/8 (1.125) 1.153 1.129 1.847 0.281 0.328 0.230
1 3/16 (1.1875) 1.217 1.192 1.943 0.297 0.344 0.241
1 1/4 (1.250) 1.280 1.254 2.036 0.312 0.359 0.251
1 5/16 (1.3125) 1.344 1.317 2.133 0.328 0.375 0.262
1 3/8 (1.375) 1.408 1.379 2.219 0.344 0.391 0.274
1 7/16 (1.4375) 1.472 1.442 2.324 0.359 0.406 0.284
1 1/2 (1.500) 1.534 1.504 2.419 0.375 0.422 0.295
1 5/8 (1.625) 1.663 1.633 2.553 0.389 0.424 0.297
1 3/4 (1.750) 1.789 1.758 2.679 0.389 0.424 0.297
1 7/8 (1.875) 1.914 1.883 2.811 0.422 0.427 0.299
2 (2.000) 2.039 2.008 2.936 0.422 0.427 0.299
2 1/4 (2.250) 2.293 2.262 3.221 0.440 0.442 0.309
2 1/2 (2.500) 2.543 2.512 3.471 0.440 0.442 0.309
2 3/4 (2.750) 2.793 2.762 3.824 0.458 0.491 0.344
3 (3.000) 3.043 3.012 4.074 0.458 0.491 0.344

Note : Dimensions are in inches.

DIN 127 A – Spring lock washers, Form A

din 127a - Spring Washer

Legend:

  • d1 – Inner diameter
  • d2 – Outer diameter
  • S – Washer width
  • h – unloaded washer height
  • r – radius
  • b – side length
  • k – tooth height

Makings:

  • Steel: steel
  • Stainless: A2, A4
  • Non Ferrous: Bronze

Table according to DIN 127:

dimensions in mm

Size For thread d1 min. d1 max. d2 max. b s h min. h max. k r Weight kg /1000pcs
3 M3 3,1 3,4 6,2 1,3 ± 0,1 0,8 ± 0,1 1,9 2,1 0,15 0,2 0,11
3,5 M3,5 3,6 3,9 6,7 1,3 ± 0,1 0,8 ± 0,1 1,9 2,2 0,15 0,2 0,12
4 M4 4,1 4,4 7,6 1,5 ± 0,1 0,9 ± 0,1 2,1 2,5 0,15 0,2 0,18
5 M5 5,1 5,4 9,2 1,8 ± 0,1 1,2 ± 0,1 2,7 3,2 0,15 0,2 0,36
6 M6 6,4 6,5 11,8 2,5 ± 0,15 1,6 ± 0,1 3,6 4,2 0,2 0,3 0,83
7 M7 7,1 7,5 12,8 2,5 ± 0,15 1,6 ± 0,1 3,6 4,2 0,2 0,3 0,93
8 M8 8,1 8,5 14,8 3 ± 0,15 2 ± 0,1 4,6 5,4 0,3 0,3 1,6
10 M10 10,2 10,7 18,1 3,5 ± 0,2 2,2 ± 0,15 5 5,9 0,3 0,5 2,53
12 M12 12,2 12,7 21,1 4 ± 0,2 2,5 ± 0,15 5,8 6,8 0,4 1 3,82
14 M14 14,2 14,7 24,1 4,5 ± 0,2 3 ± 0,15 6,8 8 0,4 1 6,01
16 M16 16,2 17 27,4 5 ± 0,2 3,5 ± 0,2 7,8 9,2 0,4 1 8,91
18 M18 18,2 19 29,4 5 ± 0,2 3,5 ± 0,2 7,8 9,2 0,4 1 9,73
20 M20 20,2 21,2 33,6 6 ± 0,2 4 ± 0,2 8,8 10,4 0,4 1 15,2
22 M22 22,5 23,5 35,9 6 ± 0,2 4 ± 0,2 8,8 10,4 0,4 1 16,5
24 M24 24,5 25,5 40 7 ± 0,25 5 ± 0,2 11 13 0,5 1,6 26,2
27 M27 27,5 28,5 43 7 ± 0,25 5 ± 0,2 11 13 0,5 1,6 28,7
30 M30 30,5 31,7 48,2 8 ± 0,25 6 ± 0,2 13,6 16,1 0,8 1,6 44,3
36 M36 36,5 37,7 58,2 10 ± 0,25 6 ± 0,2 13,6 16,1 0,8 1,6 67,3
39 M39 39,5 40,7 61,2 10 ± 0,25 6 ± 0,2 13,6 16,1 0,8 1,6 71,7
42 M42 42,5 43,7 66,2 12 ± 0,25 7 ± 0,25 15,6 18,4 0,8 2 111
45 M45 45,5 46,7 71,2 12 ± 0,25 7 ± 0,25 15,6 18,4 0,8 2 117
48 M48 49 50,6 75 12 ± 0,25 7 ± 0,25 15,6 18,4 1 2 123
52 M52 53 54,6 83 14 ± 0,25 8 ± 0,25 18 21,2 1 2 162
56 M56 57 58,5 87 14 ± 0,25 8 ± 0,25 18 21,2 1 2 193
60 M60 61 62,5 91 14 ± 0,25 8 ± 0,25 18 21,2 1 2 203
64 M64 65 66,5 95 14 ± 0,25 8 ± 0,25 18 21,2 1 2 218
68 M68 69 70,5 99 14 ± 0,25 8 ± 0,25 18 21,2 1 2 228
72 M72 73 74,5 103 14 ± 0,25 8 ± 0,25 18 21,2 1 2 240
80 M80 81 82,5 111 14 ± 0,25 8 ± 0,25 18 21,2 1 2 262
90 M90 91 92,5 121 14 ± 0,25 8 ± 0,25 18 21,2 1 2 290
100 M100 101 102,5 131 14 ± 0,25 8 ± 0,25 18 21,2 1 2 318

DIN 128 A – Split Spring Washers, Curved, Form A

din 128a - Spring Washer

Legend:

  • d1 – Inner diameter
  • d2 – Outer diameter
  • S – Washer width
  • h – unloaded washer height
  • r – radius
  • b – side length
  • c – width of opening

Makings:

  • Steel: steel
  • Stainless: A2, A4

Table according to DIN 128:

dimensions in mm

Nominal For thread d1 min. d1 max. b s h min. h max. r Weight kg/1000pcs
size
2 M2 2,1 2,4 0,9 ± 0,1 0,5 ± 0,1 0,7 0,9 0,1 0,035
2,5 M2,5 2,6 2,9 1 ± 0,1 0,6 ± 0,1 0,9 1,1 0,1 0,055
3 M3 3,1 3,4 1,3 ± 0,1 0,7 ± 0,1 1,1 1,3 0,1 0,09
3,5 M3,5 3,6 3,9 1,3 ± 0,1 0,7 ± 0,1 1,1 1,3 0,1 0,1
4 M4 4,1 4,4 1,5 ± 0,1 0,8 ± 0,1 1,2 1,4 0,2 0,15
5 M5 5,1 5,4 1,8 ± 0,1 1 ± 0,1 1,5 1,7 0,2 0,3
6 M6 6,1 6,5 2,5 ± 0,15 1,3 ± 0,1 2 2,2 0,3 0,7
7 M7 7,1 7,5 2,5 ± 0,15 1,3 ± 0,1 2 2,2 0,3 0,75
8 M8 8,1 8,5 3 ± 0,15 1,6 ± 0,1 2,45 2,75 0,5 1,3
10 M10 10,2 10,7 3,5 ± 0,2 1,8 ± 0,1 2,85 3,15 0,5 2,1
12 M12 12,2 12,7 4 ± 0,2 2,1 ± 0,15 3,35 3,65 1 3,2
14 M14 14,2 14,7 4,5 ± 0,2 2,4 ± 0,15 3,9 4,3 1 4,8
16 M16 16,2 17 5 ± 0,2 2,8 ± 0,15 4,5 5,1 1 7
18 M18 18,2 19 5 ± 0,2 2,8 ± 0,15 4,5 5,1 1 7,8
20 M20 20,2 21,2 6 ± 0,2 3,2 ± 0,2 5,1 5,9 1 12,2
22 M22 22,5 23,5 6 ± 0,2 3,2 ± 0,2 5,1 5,9 1 13,3
24 M24 24,5 25,5 7 ± 0,25 4 ± 0,2 6,5 7,5 1,6 21,5
27 M27 27,5 28,5 7 ± 0,25 4 ± 0,2 6,5 7,5 1,6 23,7
30 M30 30,5 31,7 8 ± 0,25 6 ± 0,2 9,5 10,5 1,6 42,5
36 M36 36,5 37,7 10 ± 0,25 6 ± 0,2 10,3 11,3 1,6 68

Material

Special Alloys

  • HASTELLOY® X
  • MONEL® R-405
  • MONEL® K-500
  • HASTELLOY® C-276
  • HASTELLOY® C-22
  • HASTELLOY® B-2
  • INCOLOY® 825
  • INCOLOY® 800H / 800HT®
  • INCONEL® 718
  • INCONEL® ALLOY 625
  • INCONEL® ALLOY 601
  • INCONEL® ALLOY 600
  • MONEL® ALLOY 400

ALLOY 20

  • NICKEL 200/201
  • MONEL® R-405
  • MONEL® K-500
  • MONEL® ALLOY 400
  • INCONEL® 718
  • INCONEL® ALLOY 625
  • INCONEL® ALLOY 601
  • INCONEL® ALLOY 600
  • INCOLOY® 825
  • HASTELLOY® X
  • HASTELLOY® C-276
  • HASTELLOY® C-22
  • HASTELLOY® B-2
  • INCOLOY® 800H / 800HT®
  • HASTELLOY® B-3

Duplex Stainless Steel

  • ZERON® 100, SUPER DUPLEX STAINLESS STEEL
  • Super Duplex S32760
  • LDX 2101®, DUPLEX STEEL
  • Duplex S31803
  • SUPER DUPLEX 2507
  • DUPLEX 2205

Stainless Steel

  • STAINLESS STEEL NITRONIC 50HS
  • STAINLESS STEEL NITRONIC 60
  • STAINLESS STEEL NITRONIC 50
  • STAINLESS STEEL 13-8PH
  • STAINLESS STEEL 15-5PH
  • STAINLESS STEEL PRODEC 303
  • STAINLESS STEEL 303
  • STAINLESS STEEL 446
  • STAINLESS STEEL 410S
  • STAINLESS STEEL 410
  • STAINLESS STEEL 304-304H
  • STAINLESS STEEL 17-4
  • STAINLESS STEEL 347
  • STAINLESS STEEL 440C
  • STAINLESS STEEL 309
  • STAINLESS STEEL 316-316l
  • STAINLESS STEEL AL-6XN®
  • STAINLESS STEEL 330
  • STAINLESS STEEL 321
  • 317L STAINLESS STEEL
  • STAINLESS STEEL 310/310S
  • Stainless Steel 304L
  • Stainless Steel 304
  • STAINLESS STEEL 253 MA

Carbon Steel

  • CARBON STEEL PRODUCTS

Titanium

  • 10V-2Fe-3Al
  • 6Al-4V
  • 6Al-4V STA
  • 6Al-4V ELI
  • 6Al-2Sn-4Zr-2Mo

PREV
Inquery now

SUBSCRIBE TO OUR NEWSLETTER

FOLLOW US

Chat via Whatsapp
whatsapp
Email me
Mail to us
Telephone:
8618267732328
Wechat: 8618267732328
Wechat
Skype