The tension generated by the deflection of the Mil-Spec regular helical spring split lock washer meets the needs of most commercial applications. It is, therefore, the most popular type spring lock washer in terms of usage and production. Our lockwashers are made in the USA. They meet all ASME standards in addition to RoHS and DFARS compliance when required.

Below we have charts for MS35338, NAS1640, and 12387272 Mil-Spec parts.

We also have Regular Helical Spring Split Lockwashers.

Material
C/S = Carbon Steel
304 SS = Type 304 Stainless Steel
316 SS = Type 316 Stainless Steel
420 SS = Type 420 Stainless Steel
PHO = Phosphor Bronze
KM = K-Monel

Ordering Example: #6-REG-C/S-MZ2 is a
#6 Regular carbon Steel with a
Mechanical Zinc & Yellow Dichromate finish.

Finish
PLN = Plain
CD1 = Cadmium & Clear Dichromate
CD2 = Cadmium & Yellow Dichromate
CD3 = Cadmium & Black Chromate
MZ1= Mechanical Zinc & Clear Dichromate
MZ2= Mechanical Zinc & Yellow Dichromate
ZN1 = Zinc & Clear Dichromate
ZN2 = Zinc & Yellow Dichromate
BKO = Black Oxide
PHO = Phosphate
HDG = Hot Dip Galvanized
MG = Mechanical Galvanized
Regular Helical Spring Split Lock Washer Dimension Drawing
Nominal
Washer
Size		 Inside Diameter
A
Min.		 Inside Diameter
A
Max.		 Outside
Diameter
B Max.		 Width
C
Min.		 Thickness
D
Min.		 Steel
Finish MS 35338 Dash Numbers1
PHOS 		Steel
Finish MS 35338 Dash Numbers1
CD2 		Stainless
Type
3002 MS 35338 Dash Numbers1		 Stainless
Type
420 MS 35338 Dash Numbers1		 Bronze
Finish
CD8 MS 35338 Dash Numbers1		 K
Monel		 NAS 1640
Dash
No.3
2 0.088 0.094 0.172 0.035 0.02 58 39 134 153 96 115 2
4 0.114 0.12 0.209 0.04 0.025 59 40 135 154 97 116 4
6 0.141 0.148 0.25 0.047 0.031 60 41 136 155 98 117 6
8 0.167 0.174 0.293 0.055 0.04 61 42 137 156 99 118 8
10 0.193 0.2 0.334 0.062 0.047 62 43 138 157 100 119 10
1/4 0.252 0.26 0.487 0.109 0.062 63 44 139 158 101 120 416
5/16 0.314 0.322 0.583 0.125 0.078 64 45 140 159 102 121 516
3/8 0.377 0.385 0.68 0.141 0.094 65 46 141 160 103 122 616
7/16 0.44 0.45 0.776 0.156 0.109 66 47 142 161 104 123 716
1/2 0.502 0.512 0.869 0.171 0.125 67 48 143 162 105 124 816
9/16 0.564 0.574 0.965 0.188 0.141 68 49 144 163 106 125 916
5/8 0.628 0.641 1.073 0.203 0.156 69 50 145 164 107 126 1016
7/8 0.878 0.894 1.459 0.266 0.219 71 52 1285 1416
1 1.003 1.024 1.656 0.297 0.25 72 53 148 167 110 129 1616
1-1/8 1.129 1.153 1.847 0.328 0.281 54 147 168 111 130 1816
1-1/4 1.254 1.28 2.036 0.359 0.312 55 150 169 112 131 2016
1-3/8 1.397 1.408 2.219 0.391 0.344 56 151 170 113 132 2216
1-1/2 1.504 1.534 2.419 0.422 0.375 57 152 171 114 133 2416

Footnotes: 1 – MS35338 replaces MS16214, MS35337, AN935 and NAS1061
2 – Series 300 – see referenced Mil Specifications or type requirements
3 – NAS1640 – (Stainless Steel) add P for BKO and add C for CD2
4 – Most sizes are stocked C/S PLN and C/S ZNI.
5 – Not stocked 20,000 lb. minimum material buy.