Spring Plungers

Heavy Spring Pressures

Heavy Spring Pressures

Locking Element
Spring Plunger drawing


Light Spring Pressures

Light Spring Pressures
With Steel, Delrin® or Phenolic Noses
Heavy or Light Spring Pressures

Steel noses are case hardened for wear resistance without brittleness.

Delrin® and Phenolic noses prevent marring of aluminum, brass or other soft materials.

Bodies are steel with a black oxide finish.

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.

*Conform to TCMAI/NIJFCM standards.

Heavy Spring Pressures — Heat Treated Black Oxide Steel Nose
 Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Price/ Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs/ 100
Start
1/2
Full
*33101
*33101P
$4.43
1.5
3.0
4.5
#6-32
17/32
.062
.046
1/2
33102
33102P
$4.43
1.0
1.3
1.6
#6-32
3/8
.062
.046
1/2
*33103
*33103P
$4.31
2.7
5.0
7.3
#8-32
5/8
.093
.070
1/2
*33105
*33105P
$4.05
2.9
7.0
11.1
#10-32
3/4
.125
.093
1/2
*33107
*33107P
$4.05
3.0
8.0
13.0
1/4-20
1"
.187
.119
1
33108
33108P
$4.05
3.0
8.0
13.0
1/4-28
1"
.187
.119
1
33109
33109P
$4.05
2.0
5.5
9.0
1/4-20
3/4
.125
.119
1
*33111
*33111P
$4.13
3.0
9.0
15.0
5/16-18
1"
.187
.135
2
*33113
*33113P
$4.18
5.5
10.0
14.5
3/8-16
1-1/8
.187
.186
2
*33115
*33115P
$4.37
6.6
12.0
17.4
1/2-13
1-1/4
.250
.248
5
*33117
*33117P
$5.38
10.5
18.0
25.5
5/8-11
1-1/2
.312
.310
8
*33119
*33119P
$7.97
6.7
22.0
37.3
3/4-10
1-3/4
.312
.374
14
*33120
*33120P
$14.92
16.0
42.0
68.0
1"-8
2-13/32
.500
.499
34
Heavy Spring Pressures — Brown Delrin® Nose
 Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Price/ Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs/ 100
Start
1/2
Full
*33001
*33001P
$4.31
2.7
5.0
7.3
#8-32
5/8
.093
.070
1/2
*33003
*33003P
$4.05
2.9
7.0
11.1
#10-32
3/4
.125
.093
1/2
*33005
*33005P
$4.05
3.0
8.0
13.0
1/4-20
1"
.187
.119
1
*33005A
*33005AP
$4.05
3.0
8.0
13.0
1/4-28
1"
.187
.119
1
*33007
*33007P
$4.13
3.0
9.0
15.0
5/16-18
1"
.187
.135
1-1/2
*33009
*33009P
$4.18
5.5
10.0
14.5
3/8-16
1-1/8
.187
.186
2
*33011
*33011P
$4.37
6.6
12.0
17.4
1/2-13
1-1/4
.250
.248
4
*33013
*33013P
$5.38
10.5
18.0
25.5
5/8-11
1-1/2
.312
.310
7
Heavy Spring Pressures — Phenolic Nose
Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Price/ Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs/ 100
Start
1/2
Full
33021
33021P
$4.53
2.7
5.0
7.3
#8-32
5/8
.093
.070
1/2
33023
33023P
$4.25
2.9
7.0
11.1
#10-32
3/4
.125
.093
1/2
33025
33025P
$4.25
3.0
8.0
13.0
1/4-20
1"
.187
.119
1
33025A
33025AP
$4.25
3.0
8.0
13.0
1/4-28
1"
.187
.119
1
33027
33027P
$4.34
3.0
9.0
15.0
5/16-18
1"
.187
.135
1-1/2
33029
33029P
$4.41
5.5
10.0
14.5
3/8-16
1-1/8
.187
.186
2
33031
33031P
$4.60
6.6
12.0
17.4
1/2-13
1-1/4
.250
.248
4
33033
33033P
$5.66
10.5
18.0
25.5
5/8-11
1-1/2
.312
.310
7
Light Spring Pressures — Heat Treated Zinc Plated Steel Nose
 Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Price/ Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs/ 100
Start
1/2
Full
*33201
*33201P
$4.43
0.5
1.0
1.5
#6-32
17/32
.062
.046
1/2
*33202
*33202P
$4.31
0.7
1.5
2.3
#8-32
5/8
.093
.070
1/2
*33204
*33204P
$4.05
1.3
2.0
2.7
#10-32
3/4
.125
.093
1/2
*33206
*33206P
$4.05
1.0
2.5
4.0
1/4-20
1"
.187
.119
1
33207
33207P
$4.05
1.0
2.5
4.0
1/4-28
1"
.187
.119
1
*33209
*33209P
$4.13
1.5
3.0
4.5
5/16-18
1"
.187
.135
1-1/2
*33211
*33211P
$4.18
2.8
5.0
7.2
3/8-16
1-1/8
.187
.186
2
*33213
*33213P
$4.37
2.7
6.0
9.3
1/2-13
1-1/4
.250
.248
4-1/2
*33215
*33215P
$5.38
3.5
7.0
10.5
5/8-11
1-1/2
.312
.310
8
33217
33217P
$7.97
4.0
10.0
16.0
3/4-10
1-3/4
.312
.374
14
33218
33218P
$14.92
4.0
17.5
31.0
1"-8
2-13/32
.500
.499
34
Light Spring Pressures — White Delrin® Nose
 Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Price/ Unit
End Pressure Lbs.
A
B
C
+.000
-.002
D
Net Lbs/ 100
Start
1/2
Full
*33301
*33301P
$4.31
0.7
1.5
2.3
#8-32
5/8
.093
.070
1/2
*33303
*33303P
$4.05
1.3
2.0
2.7
#10-32
3/4
.125
.093
1/2
*33305
*33305P
$4.05
1.0
2.5
4.0
1/4-20
1"
.187
.119
1
*33305A
*33305AP
$4.05
1.0
2.5
4.0
1/4-28
1"
.187
.119
1
*33307
*33307P
$4.13
1.5
3.0
4.5
5/16-18
1"
.187
.135
1-1/2
*33309
*33309P
$4.18
2.8
5.0
7.2
3/8-16
1-1/8
.187
.186
2
*33311
*33311P
$4.37
2.7
6.0
9.3
1/2-13
1-1/4
.250
.248
4
*33313
*33313P
$5.38
3.5
7.0
10.5
5/8-11
1-1/2
.312
.310
7
Light Spring Pressures — Phenolic Nose
Spring Plungers
With
Lock. Ele.
Part No.
Without
Lock. Ele.
Part No.
Price/ Unit
End Pressure Lbs.
A
B
C
+.000
-.002