Stainless Steel Spring Plungers
Standard Length

Standard Length

Locking Element
Spring Plunger drawing


Short Length

Short Length

Locking Element
Short Spring Plunger drawing

Stainless or Delrin® Nose
Heavy or Light Spring Pressures

Standard lengths available with
Phenolic noses upon request

End pressures are given in pounds. Full pressures are the force pounds needed to move the nose the distance shown in "C" columns.

The nylon locking element holds the plunger body securely in place without the need for lock nuts or other devices. We recommend a 90° countersink 1/32" larger than the major diameter of the mating thread to prevent damaging the element.

Plungers may be ordered with or without the locking element. Plungers without element are the same price, but are considered "specials" and cannot be returned. We recommend using without the locking element for applications in aluminum.

To prevent possible spring damage, use of a Northwestern Wrench is recommended when installing from plunger end.

*Plain Ends — Light Pressures; Yellow Ends — Heavy Pressures

Standard Lengths — Heavy Spring Pressures — Stainless Nose
Stainless Steel Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Color
Code*
Price
per Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs
Per 100
Start
1/2
Full
33400
33400P
Yellow
$6.20
1.5
3.0
4.5
#6-32
17/32
.062
.046
1/2
33401
33401P
Plain
$6.20
1.0
1.3
1.6
#6-32
3/8
.062
.046
1/2
33403
33403P
Yellow
$5.90
2.7
5.0
7.3
#8-32
5/8
.093
.070
1/2
33404
33404P
Yellow
$5.90
2.9
7.0
11.1
#10-32
3/4
.125
.093
1/2
33405
33405P
Yellow
$5.70
3.0
8.0
13.0
1/4-20
1"
.187
.119
1
33406
33406P
Yellow
$5.70
3.0
8.0
13.0
1/4-28
1"
.187
.119
1
33407
33407P
Plain
$5.70
2.0
5.5
9.0
1/4-20
3/4
.125
.119
1
33408
33408P
Yellow
$5.90
3.0
9.0
15.0
5/16-18
1"
.187
.135
2
33409
33409P
Yellow
$6.84
5.5
10.0
14.5
3/8-16
1-1/8
.187
.186
2
33410
33410P
Yellow
$7.97
6.6
12.0
17.4
1/2-13
1-1/4
.250
.248
5
Standard Lengths — Heavy Spring Pressures — Brown Delrin® Nose
Stainless Steel Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Color
Code*
Price
per Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs
Per 100
Start
1/2
Full
33443
33443P
Plain
$5.90
2.7
5.0
7.3
#8-32
5/8
.093
.070
1/2
33444
33444P
Plain
$5.90
2.9
7.0
11.1
#10-32
3/4
.125
.093
1/2
33445
33445P
Plain
$5.70
3.0
8.0
13.0
1/4-20
1"
.187
.119
1
33446
33446P
Plain
$5.70
3.0
8.0
13.0
1/4-28
1"
.187
.119
1
33448
33448P
Plain
$5.90
3.0
9.0
15.0
5/16-18
1"
.187
.135
2
33449
33449P
Plain
$6.84
5.5
10.0
14.5
3/8-16
1-1/8
.187
.186
2
33450
33450P
Plain
$7.97
6.6
12.0
17.4
1/2-13
1-1/4
.250
.248
5
Standard Lengths — Light Spring Pressures — Stainless Nose
Stainless Steel Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Color
Code*
Price
per Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs
Per 100
Start
1/2
Full
33500
33500P
Plain
$6.20
0.5
1.0
1.5
#6-32
17/32
.062
.046
1/2
33503
33503P
Plain
$5.90
0.7
1.5
2.3
#8-32
5/8
.093
.070
1/2
33504
33504P
Plain
$5.90
1.3
2.0
2.7
#10-32
3/4
.125
.093
1/2
33505
33505P
Plain
$5.70
1.0
2.5
4.0
1/4-20
1"
.187
.119
1
33506
33506P
Plain
$5.70
1.0
2.5
4.0
1/4-28
1"
.187
.119
1
33508
33508P
Plain
$5.90
1.5
3.0
4.5
5/16-18
1"
.187
.135
1-1/2
33509
33509P
Plain
$6.84
2.8
5.0
7.2
3/8-16
1-1/8
.187
.186
2
33510
33510P
Plain
$7.97
2.7
6.0
9.3
1/2-13
1-1/4
.250
.248
5
Standard Lengths — Light Spring Pressures — White Delrin® Nose
Stainless Steel Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Color
Code*
Price
per Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs
Per 100
Start
1/2
Full
33543
33543P
Plain
$5.90
0.7
1.5
2.3
#8-32
5/8
.093
.070
1/2
33544
33544P
Plain
$5.90
1.3
2.0
2.7
#10-32
3/4
.125
.093
1/2
33545
33545P
Plain
$5.70
1.0
2.5
4.0
1/4-20
1"
.187
.119
1
33546
335446P
Plain
$5.70
1.0
2.5
4.0
1/4-28
1"
.187
.119
1
33548
33548P
Plain
$5.90
1.5
3.0
4.5
5/16-18
1"
.187
.135
1-1/2
33549
33549P
Plain
$6.84
2.8
5.0
7.2
3/8-16
1-1/8
.187
.186
2
33550
33550P
Plain
$7.97
2.7
6.0
9.3
1/2-13
1-1/4
.250
.248
5
Short Lengths — Heavy Spring Pressures — Stainless Nose
Stainless Steel Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Color
Code*
Price
per Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs
Per 100
Start
1/2
Full
33420
33420P
Yellow
$5.51
1.5
3.1
4.75
#8-32
7/16
.052
.070
1/2
33421
33421P
Yellow
$5.51
1.5
3.1
4.75
#8-36
7/16
.052
.070
1/2
33422
33422P
Yellow
$5.51
1.75
4.0
6.25
#10-32
15/32
.065
.093
1/2
33423
33423P
Yellow
$5.38
3.0
6.75
10.5
1/4-20
17/32
.078
.119
1/2
33424
33424P
Yellow
$5.63
3.75
9.6
15.5
5/16-18
9/16
.084
.135
1
33425
33425P
Yellow
$6.33
4.5
11.5
18.5
3/8-16
5/8
.110
.186
2
33426
33426P
Yellow
$7.28
5.0
16.5
28.0
1/2-13
3/4
.151
.248
3
Short Lengths — Heavy Spring Pressures — Brown Delrin® Nose
Stainless Steel Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Color
Code*
Price
per Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs
Per 100
Start
1/2
Full
33460
33460P
Plain
$5.51
1.5
3.1
4.75
#8-32
7/16
.052
.070
1/2
33461
33461P
Plain
$5.51
1.5
3.1
4.75
#8-36
7/16
.052
.070
1/2
33462
33462P
Plain
$5.51
1.75
4.0
6.25
#10-32
15/32
.065
.093
1/2
33463
33463P