Steel with Stainless Steel Ball
Steel bodies are made of 12L14 material with a black oxide finish.
Balls are 440 stainless.
The 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.
Plungers may be ordered with or without the locking element. Plungers without the element are the same price, but are considered “specials” and cannot be returned. We recommend using without the locking element for applications in aluminum.
All part numbers ending 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 | Ball Diameter | Body Length | Thread Sizes | End Pressure Start (lbs.) | End Pressure Full (lbs.) | Hex Diameter | Color Code | Materials | Pressures | Locking Element | Buy | hf:tax:projection | hf:tax:ball_diameter | hf:tax:body_length | hf:tax:thread | hf:tax:end_pressure_lbs_start | hf:tax:end_pressure_lbs_full | hf:tax:hex_diameter | hf:tax:color_code | hf:tax:material | hf:tax:pressure | hf:tax:locking_element |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10005H | .025 | .093 | 9/16 | 10-32 | 0.5 | 1.5 | 5/64 | Plain | Steel | Light | Yes | | 025 | 093 | 9-16 | 10-32 | 0-5 | 1-5 | 5-64 | plain | steel | light | yes |
| 10005HP | .025 | .093 | 9/16 | 10-32 | 0.5 | 1.5 | 5/64 | Plain | Steel | Light | No | | 025 | 093 | 9-16 | 10-32 | 0-5 | 1-5 | 5-64 | plain | steel | light | no |
| 10006H | .025 | .093 | 9/16 | 10-32 | 1.5 | 3 | 5/64 | Black | Steel | Medium | Yes | | 025 | 093 | 9-16 | 10-32 | 1-5 | 3 | 5-64 | black | steel | medium | yes |
| 10006HP | .025 | .093 | 9/16 | 10-32 | 1.5 | 3 | 5/64 | Black | Steel | Medium | No | | 025 | 093 | 9-16 | 10-32 | 1-5 | 3 | 5-64 | black | steel | medium | no |
| 10007H | .025 | .093 | 9/16 | 10-32 | 2 | 5 | 5/64 | Yellow | Steel | Heavy | Yes | | 025 | 093 | 9-16 | 10-32 | 2 | 5 | 5-64 | yellow | steel | heavy | yes |
| 10007HP | .025 | .093 | 9/16 | 10-32 | 2 | 5 | 5/64 | Yellow | Steel | Heavy | No | | 025 | 093 | 9-16 | 10-32 | 2 | 5 | 5-64 | yellow | steel | heavy | no |
| 10008H | .035 | .125 | 43/64 | 1/4-20 | 2 | 4 | 5/64 | Plain | Steel | Light | Yes | | 035 | 125 | 43-64 | 1-4-20 | 2 | 4 | 5-64 | plain | steel | light | yes |
| 10008HP | .035 | .125 | 43/64 | 1/4-20 | 2 | 4 | 5/64 | Plain | Steel | Light | No | | 035 | 125 | 43-64 | 1-4-20 | 2 | 4 | 5-64 | plain | steel | light | no |
| 10009H | .035 | .125 | 43/64 | 1/4-20 | 3 | 7 | 5/64 | Black | Steel | Medium | Yes | | 035 | 125 | 43-64 | 1-4-20 | 3 | 7 | 5-64 | black | steel | medium | yes |
| 10009HP | .035 | .125 | 43/64 | 1/4-20 | 3 | 7 | 5/64 | Black | Steel | Medium | No | | 035 | 125 | 43-64 | 1-4-20 | 3 | 7 | 5-64 | black | steel | medium | no |
| 10010H | .035 | .125 | 43/64 | 1/4-20 | 4 | 12 | 5/64 | Yellow | Steel | Heavy | Yes | | 035 | 125 | 43-64 | 1-4-20 | 4 | 12 | 5-64 | yellow | steel | heavy | yes |
| 10010HP | .035 | .125 | 43/64 | 1/4-20 | 4 | 12 | 5/64 | Yellow | Steel | Heavy | No | | 035 | 125 | 43-64 | 1-4-20 | 4 | 12 | 5-64 | yellow | steel | heavy | no |
| 10011H | .040 | .156 | 23/32 | 5/16-18 | 2 | 4.5 | 3/32 | Plain | Steel | Light | Yes | | 040 | 156 | 23-32 | 5-16-18 | 2 | 4-5 | 3-32 | plain | steel | light | yes |
| 10011HP | .040 | .156 | 23/32 | 5/16-18 | 2 | 4.5 | 3/32 | Plain | Steel | Light | No | | 040 | 156 | 23-32 | 5-16-18 | 2 | 4-5 | 3-32 | plain | steel | light | no |
| 10012H | .040 | .156 | 23/32 | 5/16-18 | 4 | 9 | 3/32 | Black | Steel | Medium | Yes | | 040 | 156 | 23-32 | 5-16-18 | 4 | 9 | 3-32 | black | steel | medium | yes |
| 10012HP | .040 | .156 | 23/32 | 5/16-18 | 4 | 9 | 3/32 | Black | Steel | Medium | No | | 040 | 156 | 23-32 | 5-16-18 | 4 | 9 | 3-32 | black | steel | medium | no |
| 10013H | .040 | .156 | 23/32 | 5/16-18 | 6 | 17 | 3/32 | Yellow | Steel | Heavy | Yes | | 040 | 156 | 23-32 | 5-16-18 | 6 | 17 | 3-32 | yellow | steel | heavy | yes |
| 10013HP | .040 | .156 | 23/32 | 5/16-18 | 6 | 17 | 3/32 | Yellow | Steel | Heavy | No | | 040 | 156 | 23-32 | 5-16-18 | 6 | 17 | 3-32 | yellow | steel | heavy | no |
| 10014H | .048 | .187 | 13/16 | 3/8-16 | 2.5 | 5 | 5/32 | Plain | Steel | Light | Yes | | 048 | 187 | 13-16 | 3-8-16 | 2-5 | 5 | 5-32 | plain | steel | light | yes |
| 10014HP | .048 | .187 | 13/16 | 3/8-16 | 2.5 | 5 | 5/32 | Plain | Steel | Light | No | | 048 | 187 | 13-16 | 3-8-16 | 2-5 | 5 | 5-32 | plain | steel | light | no |
| 10015H | .048 | .187 | 13/16 | 3/8-16 | 5 | 10 | 5/32 | Black | Steel | Medium | Yes | | 048 | 187 | 13-16 | 3-8-16 | 5 | 10 | 5-32 | black | steel | medium | yes |
| 10015HP | .048 | .187 | 13/16 | 3/8-16 | 5 | 10 | 5/32 | Black | Steel | Medium | No | | 048 | 187 | 13-16 | 3-8-16 | 5 | 10 | 5-32 | black | steel | medium | no |
| 10016H | .048 | .187 | 13/16 | 3/8-16 | 6 | 21 | 5/32 | Yellow | Steel | Heavy | Yes | | 048 | 187 | 13-16 | 3-8-16 | 6 | 21 | 5-32 | yellow | steel | heavy | yes |
| 10016HP | .048 | .187 | 13/16 | 3/8-16 | 6 | 21 | 5/32 | Yellow | Steel | Heavy | No | | 048 | 187 | 13-16 | 3-8-16 | 6 | 21 | 5-32 | yellow | steel | heavy | no |
| 10017H | .072 | .281 | 1-3/64 | 1/2-13 | 3 | 6 | 7/32 | Plain | Steel | Light | Yes | | 072 | 281 | 1-3-64 | 1-2-13 | 3 | 6 | 7-32 | plain | steel | light | yes |
| 10017HP | .072 | .281 | 1-3/64 | 1/2-13 | 3 | 6 | 7/32 | Plain | Steel | Light | No | | 072 | 281 | 1-3-64 | 1-2-13 | 3 | 6 | 7-32 | plain | steel | light | no |
| 10018H | .072 | .281 | 1-3/64 | 1/2-13 | 6 | 12 | 7/32 | Black | Steel | Medium | Yes | | 072 | 281 | 1-3-64 | 1-2-13 | 6 | 12 | 7-32 | black | steel | medium | yes |
| 10018HP | .072 | .281 | 1-3/64 | 1/2-13 | 6 | 12 | 7/32 | Black | Steel | Medium | No | | 072 | 281 | 1-3-64 | 1-2-13 | 6 | 12 | 7-32 | black | steel | medium | no |
| 10019H | .072 | .281 | 1-3/64 | 1/2-13 | 6 | 30 | 7/32 | Yellow | Steel | Heavy | Yes | | 072 | 281 | 1-3-64 | 1-2-13 | 6 | 30 | 7-32 | yellow | steel | heavy | yes |
| 10019HP | .072 | .281 | 1-3/64 | 1/2-13 | 6 | 30 | 7/32 | Yellow | Steel | Heavy | No | | 072 | 281 | 1-3-64 | 1-2-13 | 6 | 30 | 7-32 | yellow | steel | heavy | no |
| 10020H | .096 | .375 | 1-15/64 | 5/8-11 | 4.5 | 9 | 1/4 | Plain | Steel | Light | Yes | | 096 | 375 | 1-15-64 | 5-8-11 | 4-5 | 9 | 1-4 | plain | steel | light | yes |
| 10020HP | .096 | .375 | 1-15/64 | 5/8-11 | 4.5 | 9 | 1/4 | Plain | Steel | Light | No | | 096 | 375 | 1-15-64 | 5-8-11 | 4-5 | 9 | 1-4 | plain | steel | light | no |
| 10021H | .096 | .375 | 1-15/64 | 5/8-11 | 9 | 18 | 1/4 | Black | Steel | Medium | Yes | | 096 | 375 | 1-15-64 | 5-8-11 | 9 | 18 | 1-4 | black | steel | medium | yes |
| 10021HP | .096 | .375 | 1-15/64 | 5/8-11 | 9 | 18 | 1/4 | Black | Steel | Medium | No | | 096 | 375 | 1-15-64 | 5-8-11 | 9 | 18 | 1-4 | black | steel | medium | no |
| 10022H | .096 | .375 | 1-15/64 | 5/8-11 | 7 | 50 | 1/4 | Yellow | Steel | Heavy | Yes | | 096 | 375 | 1-15-64 | 5-8-11 | 7 | 50 | 1-4 | yellow | steel | heavy | yes |
| 10022HP | .096 | .375 | 1-15/64 | 5/8-11 | 7 | 50 | 1/4 | Yellow | Steel | Heavy | No | | 096 | 375 | 1-15-64 | 5-8-11 | 7 | 50 | 1-4 | yellow | steel | heavy | no |