Light Pressure
Steel noses are case hardened for wear resistance without brittleness.
Bodies are 12L14 steel with a black oxide finish.
The nylon locking element holds the plunger body securely in place without the need for lock nuts or other devices. We recommend a 90 degree countersink 1/32″ larger than the major diameter of the mating thread to prevent damaging the element.
All part numbers that end with a “P” do NOT have a locking element.
To prevent possible spring damage, use of a Northwestern Wrench is recommended when installing from plunger end.
| Part # | Projection | Nose Diameter | Body Length | Thread Sizes | End Pressure Start (lbs.) | End Pressure Full (lbs.) | Materials | Pressures | Locking Element | Buy | hf:tax:projection | hf:tax:nose_diameter | hf:tax:body_length | hf:tax:thread | hf:tax:end_pressure_lbs_start | hf:tax:end_pressure_lbs_full | hf:tax:material | hf:tax:pressure | hf:tax:locking_element |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 33301P | 0.093 | 0.07 | 5/8 | 8-32 | 0.7 | 2.3 | Steel | Light | No | | 0-093 | 0-07 | 5-8 | 8-32 | 0-7 | 2-3 | steel | light | no |
| 33303P | 0.125 | 0.093 | 3/4 | 10-32 | 1.3 | 2.7 | Steel | Light | No | | 0-125 | 0-093 | 3-4 | 10-32 | 1-3 | 2-7 | steel | light | no |
| 33305P | 0.187 | 0.119 | 1" | 1/4-20 | 1 | 4 | Steel | Light | No | | 0-187 | 0-119 | 1 | 1-4-20 | 1 | 4 | steel | light | no |
| 33305AP | 0.187 | 0.119 | 1" | 1/4-28 | 1 | 4 | Steel | Light | No | | 0-187 | 0-119 | 1 | 1-4-28 | 1 | 4 | steel | light | no |
| 33307P | 0.187 | 0.135 | 1" | 5/16-18 | 1.5 | 4.5 | Steel | Light | No | | 0-187 | 0-135 | 1 | 5-16-18 | 1-5 | 4-5 | steel | light | no |
| 33309P | 0.187 | 0.186 | 1-1/8 | 3/8-16 | 2.8 | 7.2 | Steel | Light | No | | 0-187 | 0-186 | 1-1-8 | 3-8-16 | 2-8 | 7-2 | steel | light | no |
| 33311P | 0.25 | 0.248 | 1-1/4 | 1/2-13 | 2.7 | 9.3 | Steel | Light | No | | 0-25 | 0-248 | 1-1-4 | 1-2-13 | 2-7 | 9-3 | steel | light | no |
| 33313P | 0.312 | 0.31 | 1-1/2 | 5/8-11 | 3.5 | 10.5 | Steel | Light | No | | 0-312 | 0-31 | 1-1-2 | 5-8-11 | 3-5 | 10-5 | steel | light | no |
| 33301 | 0.093 | 0.07 | 5/8 | 8-32 | 0.7 | 2.3 | Steel | Light | Yes | | 0-093 | 0-07 | 5-8 | 8-32 | 0-7 | 2-3 | steel | light | yes |
| 33303 | 0.125 | 0.093 | 3/4 | 10-32 | 1.3 | 2.7 | Steel | Light | Yes | | 0-125 | 0-093 | 3-4 | 10-32 | 1-3 | 2-7 | steel | light | yes |
| 33305 | 0.187 | 0.119 | 1" | 1/4-20 | 1 | 4 | Steel | Light | Yes | | 0-187 | 0-119 | 1 | 1-4-20 | 1 | 4 | steel | light | yes |
| 33305A | 0.187 | 0.119 | 1" | 1/4-28 | 1 | 4 | Steel | Light | Yes | | 0-187 | 0-119 | 1 | 1-4-28 | 1 | 4 | steel | light | yes |
| 33307 | 0.187 | 0.135 | 1" | 5/16-18 | 1.5 | 4.5 | Steel | Light | Yes | | 0-187 | 0-135 | 1 | 5-16-18 | 1-5 | 4-5 | steel | light | yes |
| 33309 | 0.187 | 0.186 | 1-1/8 | 3/8-16 | 2.8 | 7.2 | Steel | Light | Yes | | 0-187 | 0-186 | 1-1-8 | 3-8-16 | 2-8 | 7-2 | steel | light | yes |
| 33311 | 0.25 | 0.248 | 1-1/4 | 1/2-13 | 2.7 | 9.3 | Steel | Light | Yes | | 0-25 | 0-248 | 1-1-4 | 1-2-13 | 2-7 | 9-3 | steel | light | yes |
| 33313 | 0.312 | 0.31 | 1-1/2 | 5/8-11 | 3.5 | 10.5 | Steel | Light | Yes | | 0-312 | 0-31 | 1-1-2 | 5-8-11 | 3-5 | 10-5 | steel | light | yes |
| 33321P | 0.093 | 0.07 | 5/8 | 8-32 | 0.7 | 2.3 | Steel | Light | No | | 0-093 | 0-07 | 5-8 | 8-32 | 0-7 | 2-3 | steel | light | no |
| 33323P | 0.125 | 0.093 | 3/4 | 10-32 | 1.3 | 2.7 | Steel | Light | No | | 0-125 | 0-093 | 3-4 | 10-32 | 1-3 | 2-7 | steel | light | no |
| 33325P | 0.187 | 0.119 | 1" | 1/4-20 | 1 | 4 | Steel | Light | No | | 0-187 | 0-119 | 1 | 1-4-20 | 1 | 4 | steel | light | no |
| 33325AP | 0.187 | 0.119 | 1" | 1/4-28 | 1 | 4 | Steel | Light | No | | 0-187 | 0-119 | 1 | 1-4-28 | 1 | 4 | steel | light | no |
| 33327P | 0.187 | 0.135 | 1" | 5/16-18 | 1.5 | 4.5 | Steel | Light | No | | 0-187 | 0-135 | 1 | 5-16-18 | 1-5 | 4-5 | steel | light | no |
| 33329P | 0.187 | 0.186 | 1-1/8 | 3/8-16 | 2.8 | 7.2 | Steel | Light | No | | 0-187 | 0-186 | 1-1-8 | 3-8-16 | 2-8 | 7-2 | steel | light | no |
| 33331P | 0.25 | 0.248 | 1-1/4 | 1/2-13 | 2.7 | 9.3 | Steel | Light | No | | 0-25 | 0-248 | 1-1-4 | 1-2-13 | 2-7 | 9-3 | steel | light | no |
| 33333P | 0.312 | 0.31 | 1-1/2 | 5/8-11 | 3.5 | 10.5 | Steel | Light | No | | 0-312 | 0-31 | 1-1-2 | 5-8-11 | 3-5 | 10-5 | steel | light | no |
| 33321 | 0.093 | 0.07 | 5/8 | 8-32 | 0.7 | 2.3 | Steel | Light | No | | 0-093 | 0-07 | 5-8 | 8-32 | 0-7 | 2-3 | steel | light | no |
| 33323 | 0.125 | 0.093 | 3/4 | 10-32 | 1.3 | 2.7 | Steel | Light | No | | 0-125 | 0-093 | 3-4 | 10-32 | 1-3 | 2-7 | steel | light | no |
| 33325 | 0.187 | 0.119 | 1" | 1/4-20 | 1 | 4 | Steel | Light | No | | 0-187 | 0-119 | 1 | 1-4-20 | 1 | 4 | steel | light | no |
| 33325A | 0.187 | 0.119 | 1" | 1/4-28 | 1 | 4 | Steel | Light | No | | 0-187 | 0-119 | 1 | 1-4-28 | 1 | 4 | steel | light | no |
| 33327 | 0.187 | 0.135 | 1" | 5/16-18 | 1.5 | 4.5 | Steel | Light | No | | 0-187 | 0-135 | 1 | 5-16-18 | 1-5 | 4-5 | steel | light | no |
| 33329 | 0.187 | 0.186 | 1-1/8 | 3/8-16 | 2.8 | 7.2 | Steel | Light | No | | 0-187 | 0-186 | 1-1-8 | 3-8-16 | 2-8 | 7-2 | steel | light | no |
| 33331 | 0.25 | 0.248 | 1-1/4 | 1/2-13 | 2.7 | 9.3 | Steel | Light | No | | 0-25 | 0-248 | 1-1-4 | 1-2-13 | 2-7 | 9-3 | steel | light | no |
| 33333 | 0.312 | 0.31 | 1-1/2 | 5/8-11 | 3.5 | 10.5 | Steel | Light | No | | 0-312 | 0-31 | 1-1-2 | 5-8-11 | 3-5 | 10-5 | steel | light | no |
| 33201P | 0.062 | 0.046 | 17/32 | 6-32 | 0.5 | 1.5 | Steel | Light | No | | 0-062 | 0-046 | 17-32 | 6-32 | 0-5 | 1-5 | steel | light | no |
| 33202P | 0.093 | 0.07 | 5/8 | 8-32 | 0.7 | 2.3 | Steel | Light | No | | 0-093 | 0-07 | 5-8 | 8-32 | 0-7 | 2-3 | steel | light | no |
| 33204P | 0.125 | 0.093 | 3/4 | 10-32 | 1.3 | 2.7 | Steel | Light | No | | 0-125 | 0-093 | 3-4 | 10-32 | 1-3 | 2-7 | steel | light | no |
| 33206P | 0.187 | 0.119 | 1" | 1/4-20 | 1 | 4 | Steel | Light | No | | 0-187 | 0-119 | 1 | 1-4-20 | 1 | 4 | steel | light | no |
| 33207P | 0.187 | 0.119 | 1" | 1/4-28 | 1 | 4 | Steel | Light | No | | 0-187 | 0-119 | 1 | 1-4-28 | 1 | 4 | steel | light | no |
| 33209P | 0.187 | 0.135 | 1" | 5/16-18 | 1.5 | 4.5 | Steel | Light | No | | 0-187 | 0-135 | 1 | 5-16-18 | 1-5 | 4-5 | steel | light | no |
| 33211P | 0.187 | 0.186 | 1-1/8 | 3/8-16 | 2.8 | 7.2 | Steel | Light | No | | 0-187 | 0-186 | 1-1-8 | 3-8-16 | 2-8 | 7-2 | steel | light | no |
| 33213P | 0.25 | 0.248 | 1-1/4 | 1/2-13 | 2.7 | 9.3 | Steel | Light | No | | 0-25 | 0-248 | 1-1-4 | 1-2-13 | 2-7 | 9-3 | steel | light | no |
| 33215P | 0.312 | 0.31 | 1-1/2 | 5/8-11 | 3.5 | 10.5 | Steel | Light | No | | 0-312 | 0-31 | 1-1-2 | 5-8-11 | 3-5 | 10-5 | steel | light | no |
| 33217P | 0.312 | 0.374 | 1-3/4 | 3/4-10 | 4 | 16 | Steel | Light | No | | 0-312 | 0-374 | 1-3-4 | 3-4-10 | 4 | 16 | steel | light | no |
| 33218P | 0.5 | 0.499 | 2-13/32 | 1"-8 | 4 | 31 | Steel | Light | No | | 0-5 | 0-499 | 2-13-32 | 1-8 | 4 | 31 | steel | light | no |
| 33201 | 0.062 | 0.046 | 17/32 | 6-32 | 0.5 | 1.5 | Steel | Light | Yes | | 0-062 | 0-046 | 17-32 | 6-32 | 0-5 | 1-5 | steel | light | yes |
| 33202 | 0.093 | 0.07 | 5/8 | 8-32 | 0.7 | 2.3 | Steel | Light | Yes | | 0-093 | 0-07 | 5-8 | 8-32 | 0-7 | 2-3 | steel | light | yes |
| 33204 | 0.125 | 0.093 | 3/4 | 10-32 | 1.3 | 2.7 | Steel | Light | Yes | | 0-125 | 0-093 | 3-4 | 10-32 | 1-3 | 2-7 | steel | light | yes |
| 33206 | 0.187 | 0.119 | 1" | 1/4-20 | 1 | 4 | Steel | Light | Yes | | 0-187 | 0-119 | 1 | 1-4-20 | 1 | 4 | steel | light | yes |
| 33207 | 0.187 | 0.119 | 1" | 1/4-28 | 1 | 4 | Steel | Light | Yes | | 0-187 | 0-119 | 1 | 1-4-28 | 1 | 4 | steel | light | yes |
| 33209 | 0.187 | 0.135 | 1" | 5/16-18 | 1.5 | 4.5 | Steel | Light | Yes | | 0-187 | 0-135 | 1 | 5-16-18 | 1-5 | 4-5 | steel | light | yes |
| 33211 | 0.187 | 0.186 | 1-1/8 | 3/8-16 | 2.8 | 7.2 | Steel | Light | Yes | | 0-187 | 0-186 | 1-1-8 | 3-8-16 | 2-8 | 7-2 | steel | light | yes |
| 33213 | 0.25 | 0.248 | 1-1/4 | 1/2-13 | 2.7 | 9.3 | Steel | Light | Yes | | 0-25 | 0-248 | 1-1-4 | 1-2-13 | 2-7 | 9-3 | steel | light | yes |
| 33215 | 0.312 | 0.31 | 1-1/2 | 5/8-11 | 3.5 | 10.5 | Steel | Light | Yes | | 0-312 | 0-31 | 1-1-2 | 5-8-11 | 3-5 | 10-5 | steel | light | yes |
| 33217 | 0.312 | 0.374 | 1-3/4 | 3/4-10 | 4 | 16 | Steel | Light | Yes | | 0-312 | 0-374 | 1-3-4 | 3-4-10 | 4 | 16 | steel | light | yes |
| 33218 | 0.5 | 0.499 | 2-13/32 | 1"-8 | 4 | 31 | Steel | Light | Yes | | 0-5 | 0-499 | 2-13-32 | 1-8 | 4 | 31 | steel | light | yes |