Welcome to Northwestern Tools

Steel Ball Plungers

Locking Element
Ball Plunger drawing

The wrench slot on the ball end only of Ball Plungers with #4, #5 or #6 threads has been eliminated.

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.

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.

All parts conform to TCMAI/NIJFCM standards

*These Ball Plunger part numbers have a nylon patch as the locking element. All others have a pellet.

**Silver/Plain — Light Pressures; Black — Medium Pressures; Gold — Heavy Pressures

Steel Ball Plungers — Stainless Ball Noses
With Lock Ele. Part No.	W/O Lock Ele. Part No.	Color Code**	Price/ Unit	End Pressure Lbs.		A	B	C	Ball Dia. D	Net Lbs/ 100
With Lock Ele. Part No.	W/O Lock Ele. Part No.	Color Code**	Price/ Unit	Start	Full	A	B	C	Ball Dia. D	Net Lbs/ 100
*10001B	10001BP	Plain	$4.47	0.12	0.5	#4-48	3/16	.020	.062	1/4
*10002B	10002BP	Plain	$4.37	0.25	0.75	#5-40	1/4	.020	.062	1/4
*10003B	10003BP	Plain	$4.24	0.5	1.0	#6-40	5/16	.023	.078	1/4
*10004B	10004BP	Plain	$4.13	0.5	1.25	#8-36	11/32	.025	.093	1/4
*10100B	10100BP	Plain	$4.13	0.5	1.25	#8-32	11/32	.025	.093	1/4
10005	10005P	Silver	$3.79	0.5	1.5	#10-32	33/64	.025	.093	1/4
10006	10006P	Black	$3.79	1.5	3.0	#10-32	33/64	.025	.093	1/4
10007	10007P	Gold	$3.79	2.0	5.0	#10-32	33/64	.025	.093	1/4
10008	10008P	Silver	$3.92	2.0	4.0	1/4-20	17/32	.035	.125	1/2
10009	10009P	Black	$3.92	3.0	7.0	1/4-20	17/32	.035	.125	1/2
10010	10010P	Gold	$3.92	4.0	12.0	1/4-20	17/32	.035	.125	1/2
10011	10011P	Silver	$4.05	2.0	4.5	5/16-18	37/64	.040	.156	1
10012	10012P	Black	$4.05	4.0	9.0	5/16-18	37/64	.040	.156	1
10013	10013P	Gold	$4.05	6.0	17.0	5/16-18	37/64	.040	.156	1
10014	10014P	Silver	$4.18	2.5	5.0	3/8-16	5/8	.048	.187	1-1/2
10015	10015P	Black	$4.18	5.0	10.0	3/8-16	5/8	.048	.187	1-1/2
10016	10016P	Gold	$4.18	6.0	21.0	3/8-16	5/8	.048	.187	1-1/2
10017	10017P	Silver	$4.56	3.0	6.0	1/2-13	3/4	.072	.281	3
10018	10018P	Black	$4.56	6.0	12.0	1/2-13	3/4	.072	.281	3
10019	10019P	Gold	$4.56	6.0	30.0	1/2-13	3/4	.072	.281	3
10020	10020P	Silver	$5.19	4.5	9.0	5/8-11	63/64	.096	.375	5-1/2
10021	10021P	Black	$5.19	9.0	18.0	5/8-11	63/64	.096	.375	5-1/2
10022	10022P	Gold	$5.19	7.0	50.0	5/8-11	63/64	.096	.375	5-1/2

Steel Ball Plungers — Delrin® Ball Noses
With Lock Ele. Part No.	W/O Lock Ele. Part No.	Color Code**	Price/ Unit	End Pressure Lbs.		A	B	C	Ball Dia. D
With Lock Ele. Part No.	W/O Lock Ele. Part No.	Color Code**	Price/ Unit	Start	Full	A	B	C	Ball Dia. D
*10250	10250P	Plain	$4.47	0.12	0.5	#4-48	3/16	.020	.062
*10251	10251P	Plain	$4.37	0.25	0.75	#5-40	1/4	.020	.062
*10252	10252P	Plain	$4.24	0.5	1.0	#6-40	5/16	.023	.078
*10253	10253P	Plain	$4.13	0.5	1.25	#8-36	11/32	.025	.093
*10254	10254P	Plain	$4.13	0.5	1.25	#8-32	11/32	.025	.093
10255	10255P	Silver	$3.79	0.5	1.5	#10-32	33/64	.025	.093
10256	10256P	Black	$3.79	1.5	3.0	#10-32	33/64	.025	.093
10257	10257P	Gold	$3.79	2.0	5.0	#10-32	33/64	.025	.093
10258	10258P	Silver	$3.92	2.0	4.0	1/4-20	17/32	.035	.125
10259	10259P	Black	$3.92	3.0	7.0	1/4-20	17/32	.035	.125
10260	10260P	Gold	$3.92	4.0	12.0	1/4-20	17/32	.035	.125
10261	10261P	Silver	$4.05	2.0	4.5	5/16-18	37/64	.040	.156
10262	10262P	Black	$4.05	4.0	9.0	5/16-18	37/64	.040	.156
10263	10263P	Gold	$4.05	6.0	17.0	5/16-18	37/64	.040	.156
10264	10264P	Silver	$4.18	2.5	5.0	3/8-16	5/8	.048	.187
10265	10265P	Black	$4.18	5.0	10.0	3/8-16	5/8	.048	.187
10266	10266P	Gold	$4.18	6.0	21.0	3/8-16	5/8	.048	.187
10267	10267P	Silver	$4.56	3.0	6.0	1/2-13	3/4	.072	.281
10268	10268P	Black	$4.56	6.0	12.0	1/2-13	3/4	.072	.281
10269	10269P	Gold	$4.56	6.0	30.0	1/2-13	3/4	.072	.281
10270	10270P	Silver	$5.19	4.5	9.0	5/8-11	63/64	.096	.375
10271	10271P	Black	$5.19	9.0	18.0	5/8-11	63/64	.096	.375
10272	10272P	Gold	$5.19	7.0	50.0	5/8-11	63/64	.096	.375

Price Guide
All prices are subject to change without notice.
Contact Us for current prices and bulk pricing.

In addition to the standard components shown,
special sizes can also be furnished.
Send print or drawing for quotation.

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Phone: 937-298-9994
800-236-3956