The smaller O.D. on the Hi-Collar helical spring lockwasher accommodates confined areas. The increased thickness sustains the washer’s overall locking effectiveness. The Hi-Collar is recommended for use with socket head cap screws and where there are clearance limitations.

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: 1.) MS551848-50 or 1/4 HC 316 SS is a 1/4 Hi-Collar Type 316 Stainless Steel
2.) 5/16 HC 304 SS is a 5/16 Hi-Collar Type 304 Stainless Steel

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
lw12
Nominal
Washer
Size
Inside Diameter
A
Min.
Inside Diameter
A
Max.
Outside
Diameter
B
Width
C
Thickness
D
WCL
Product Number
See Code Table
Steel Finish
ZN2 or PHO
MS 51848
Dash Numbers1
Steel Finish
ZN2 or CD2
MS 51848
Dash Numbers1
Stainless Type
300 MS 51848
Dash Numbers1
Stainless Type
3002 NAS 1676
Dash Numbers
Steel Finish
CD23 NAS 1676
Dash Numbers
0.062.068.112.018.018#0 HC-T1-T221141C0
1.075.081.123.022.022#1 HC-T1-T2C1
2.088.094.142.020.020#2 HC-T1-T223343C22
4.114.120.173.022.022#4 HC-T1-T225545C44
5.127.133.202.030.030#5 HC-T1-T2
6.141.148.216.030.030#6 HC-T1-T227747C66
8.167.174.267.042.047#8 HC-T1-T228848C88
10.193.200.294.042.047#10 HC-T1-T229949C1010
12.220.227.331.047.078#12 HC-T1-T2
1/4.252.260.363.047.0781/4 HC-T1-T2301050C416416
5/16.314.322.457.062.0935/16 HC-T1-T2311151C516516
3/8.377.385.550.076.1253/8 HC-T1-T2321252C616616
7/16.440.450.644.090.1407/16 HC-T1-T2331353C716716
1/2.502.512.733.103.1721/2 HC-T1-T2341454C816816
9/16.564.574.819.116.1879/16 HC-T1-T2
5/8.628.641.917.125.2035/8 HC-T1-T21555C10161016
3/4.753.7661.105.154.2183/4 HC-T1-T216C12161216
7/8.878.8941.291.182.2347/8 HC-T1-T217C14161416
11.0031.0241.478.208.2501″ HC-T1-T218C16161616
1-1/81.1291.1531.663.236.3131 1/8 HC-T1-T2
1-1/41.2541.2801.790.236.3131 1/4 HC-T1-T2
1-3/81.3971.4082.031.292.3751 3/8 HC-T1-T2
1-1/21.5041.5342.159.292.3751 1/2 HC-T1-T2
1-3/41.7581.7892.596.383.4691 3/4 HC-T1-T2
22.0082.0392.846.383.4692″ HC-T1-T2
2-1/42.2622.2933.345.508.5082 1/4 HC-T1-T2
2-1/22.5122.5433.595.508.5082 1/2 HC-T1-T2
Footnotes: 1 MS51848-I indicates #0HC C/S CD1 or ZN1 MS51848 series was designated to supercede the NAS1676 specifications, however the NAS committee has not agreed yet.
2 NAS1676 add a P after dash # to indicate BKO finish on Stainless Steel.
3 NAS1676 steel dash numbers add a P to indicate Cad with a black Chromate finish (CD3).