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Captive Locating Screws with Adjustable Knurled Knob

Captive & Clamping Pins

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Product Information

New item! Also available in metric!

These Captive Locating Screws have an integral adjustable knurled knob for tightening by hand. Knurled knob captive locating screws exerts positive, repeatable force. Clockwise, the knob de-clutches and turns freely when you reach the desired torque. Counterclockwise, the knob locks for positive retraction.

Captive Locating Screws can be used for locating and clamping, or for clamping only, by selecting the appropriate screw length. The locating screw's precision-ground body is positively retained in a locking bushing. In fully retracted position, the bushing's spring clip snaps into the body's radial groove. This holds the screw fully retracted by spring force and positively prevents removal. Spring pressure also holds the screw in intermediate extended positions, an advantage especially if the fixture is turned upside down. Available in thread sizes from 1/4-20 to 1/2-13 (M6 to M12 in metric).

The complete assemblies listed below include a Captive Locating Screw, Locking-Pin Bushing, and Lockscrew. Choice of standard or long bushing in most sizes, for installation in thinner or thicker plates. Locking-Pin Bushings are designed to press fit in a standard reamed hole, and can be further secured with the included Lockscrew to positively hold the bushing in place.

Made in USA.

Application Information

application image captive pin with adjustable knob

In fully retracted position, the bushing's spring clip holds the Locating Screw fully retracted by spring force and positively prevents removal. Spring pressure also holds the screw in intermediate extended positions.

Adjustment Information

To set desired force, first remove the outer cover screw at the side of the knob, to expose the adjustment screw. Next, insert a hex wrench to turn the adjustment screw until desired torque is achieved. Reinstall the outer cover screw when finished. Torque can be adjusted from 3 to 6 inch-lbs, resulting in a contact force of 10 to 125 lbs, but these values are approximate. Force can vary +/- 30% depending on lubrication and other operating conditions.

Materials

ITEM	MATERIAL	HEAT TREAT	FINISH	DFARS	RoHS
Torque Knob and Body	1215 Steel	-	Black Oxide	鉁�	鉁�
Screw	1215 Steel	Carburized-hardened	Black Oxide	鉁�	鉁�
Locking Bushing	1144 Steel or Equivalent	Carburized-hardened	Black Oxide	鉁�	鉁�
Retainer Clip	Spring Steel	-	-	鉁�	鉁�

Click here for detailed material and finish specifications.

California residents click here for Prop 65 information.

Captive pin with adjustable knob line drawing

Captive Locating Screws with Adjustable Knurled Knob

Complete Assembly (Inch)

QUANTITY	PART NO.	A DIA NOMINAL	A DIA ACTUAL +0/-0.0005	B SCREW LENGTH	P BUSHING LENGTH UNDER HEAD	P	E THREAD	F	G	L	M	N DIA NOMINAL	N DIA ACTUAL +0/-0.0003	R +0.03/-0.01	S DIA	LOCATING SCREW (INCLUDED)	BUSHING (INCLUDED)	LOCKSCREW (INCLUDED)	TORQUE ADJUSTMENT RANGE (in-lbs)	END-FORCE ADJUSTMENT RANGE (lbs)
	CL-4-CLTA-1.25	1/4	.2490	1-1/4	Standard	.31	1/4-20	.40	.59	.81	.25	13/32	.4078	.62	13/16	CL-4-CLT-1.25	CL-4-LPB	LS-1	3 - 6	10 - 125
	CL-42-CLTA-1.25	1/4	.2490	1-1/4	Long	.50	1/4-20	.40	.59	.81	.25	13/32	.4078	.62	13/16	CL-4-CLT-1.25	CL-4A-LPB	LS-1	3 - 6	10 - 125
	CL-4-CLTA-1.75	1/4	.2490	1-3/4	Standard	.31	1/4-20	.40	.59	1.31	.25	13/32	.4078	.62	13/16	CL-4-CLT-1.75	CL-4-LPB	LS-1	3 - 6	10 - 125
	CL-42-CLTA-1.75	1/4	.2490	1-3/4	Long	.50	1/4-20	.40	.59	1.31	.25	13/32	.4078	.62	13/16	CL-4-CLT-1.75	CL-4A-LPB	LS-1	3 - 6	10 - 125
	CL-5-CLTA-1.38	5/16	.3115	1-3/8	Standard	.31	5/16-18	.47	.65	.94	.32	1/2	.5017	.62	13/16	CL-5-CLT-1.38	CL-5-LPB	LS-1	3 - 6	10 - 125
	CL-52-CLTA-1.38	5/16	.3115	1-3/8	Medium	.37	5/16-18	.47	.65	.94	.32	1/2	.5017	.62	13/16	CL-5-CLT-1.38	CL-5A-LPB	LS-1	3 - 6	10 - 125
	CL-53-CLTA-1.38	5/16	.3115	1-3/8	Long	.50	5/16-18	.47	.65	.94	.32	1/2	.5017	.62	13/16	CL-5-CLT-1.38	CL-5B-LPB	LS-1	3 - 6	10 - 125
	CL-5-CLTA-1.75	5/16	.3115	1-3/4	Standard	.31	5/16-18	.47	.65	1.31	.32	1/2	.5017	.62	13/16	CL-5-CLT-1.75	CL-5-LPB	LS-1	3 - 6	10 - 125
	CL-52-CLTA-1.75	5/16	.3115	1-3/4	Medium	.37	5/16-18	.47	.65	1.31	.32	1/2	.5017	.62	13/16	CL-5-CLT-1.75	CL-5A-LPB	LS-1	3 - 6	10 - 125
	CL-53-CLTA-1.75	5/16	.3115	1-3/4	Long	.50	5/16-18	.47	.65	1.31	.32	1/2	.5017	.62	13/16	CL-5-CLT-1.75	CL-5B-LPB	LS-1	3 - 6	10 - 125
	CL-5-CLTA-3.00	5/16	.3115	3	Standard	.31	5/16-18	.47	.65	2.56	.32	1/2	.5017	.62	13/16	CL-5-CLT-3.00	CL-5-LPB	LS-1	3 - 6	10 - 125
	CL-52-CLTA-3.00	5/16	.3115	3	Medium	.37	5/16-18	.47	.65	2.56	.32	1/2	.5017	.62	13/16	CL-5-CLT-3.00	CL-5A-LPB	LS-1	3 - 6	10 - 125
	CL-53-CLTA-3.00	5/16	.3115	3	Long	.50	5/16-18	.47	.65	2.56	.32	1/2	.5017	.62	13/16	CL-5-CLT-3.00	CL-5B-LPB	LS-1	3 - 6	10 - 125
	CL-6-CLTA-1.50	3/8	.3740	1-1/2	Standard	.31	3/8-16	.56	.75	1.06	.41	5/8	.6267	.62	13/16	CL-6-CLT-1.50	CL-6-LPB	LS-1	3 - 6	10 - 125
	CL-62-CLTA-1.50	3/8	.3740	1-1/2	Long	.50	3/8-16	.56	.75	1.06	.41	5/8	.6267	.62	13/16	CL-6-CLT-1.50	CL-6A-LPB	LS-1	3 - 6	10 - 125
	CL-6-CLTA-1.75	3/8	.3740	1-3/4	Standard	.31	3/8-16	.56	.75	1.31	.41	5/8	.6267	.62	13/16	CL-6-CLT-1.75	CL-6-LPB	LS-1	3 - 6	10 - 125
	CL-62-CLTA-1.75	3/8	.3740	1-3/4	Long	.50	3/8-16	.56	.75	1.31	.41	5/8	.6267	.62	13/16	CL-6-CLT-1.75	CL-6A-LPB	LS-1	3 - 6	10 - 125
	CL-6-CLTA-2.00	3/8	.3740	2	Standard	.31	3/8-16	.56	.75	1.56	.41	5/8	.6267	.62	13/16	CL-6-CLT-2.00	CL-6-LPB	LS-1	3 - 6	10 - 125
	CL-62-CLTA-2.00	3/8	.3740	2	Long	.50	3/8-16	.56	.75	1.56	.41	5/8	.6267	.62	13/16	CL-6-CLT-2.00	CL-6A-LPB	LS-1	3 - 6	10 - 125
	CL-6-CLTA-3.00	3/8	.3740	3	Standard	.31	3/8-16	.56	.75	2.56	.41	5/8	.6267	.62	13/16	CL-6-CLT-3.00	CL-6-LPB	LS-1	3 - 6	10 - 125
	CL-62-CLTA-3.00	3/8	.3740	3	Long	.50	3/8-16	.56	.75	2.56	.41	5/8	.6267	.62	13/16	CL-6-CLT-3.00	CL-6A-LPB	LS-1	3 - 6	10 - 125
	CL-8-CLTA-1.50	1/2	.4990	1-1/2	Standard	.50	1/2-13	.75	.93	1.06	.60	3/4	.7518	.75	1-1/16	CL-8-CLT-1.50	CL-8-LPB	LS-1	3 - 6	10 - 125
	CL-82-CLTA-1.50	1/2	.4990	1-1/2	Long	.75	1/2-13	.75	.93	1.06	.60	3/4	.7518	.75	1-1/16	CL-8-CLT-1.50	CL-8A-LPB	LS-1	3 - 6	10 - 125
	CL-8-CLTA-2.00	1/2	.4990	2	Standard	.50	1/2-13	.75	.93	1.56	.60	3/4	.7518	.75	1-1/16	CL-8-CLT-2.00	CL-8-LPB	LS-1	3 - 6	10 - 125
	CL-82-CLTA-2.00	1/2	.4990	2	Long	.75	1/2-13	.75	.93	1.56	.60	3/4	.7518	.75	1-1/16	CL-8-CLT-2.00	CL-8A-LPB	LS-1	3 - 6	10 - 125
	CL-8-CLTA-3.00	1/2	.4990	3	Standard	.50	1/2-13	.75	.93	2.56	.60	3/4	.7518	.75	1-1/16	CL-8-CLT-3.00	CL-8-LPB	LS-1	3 - 6	10 - 125
	CL-82-CLTA-3.00	1/2	.4990	3	Long	.75	1/2-13	.75	.93	2.56	.60	3/4	.7518	.75	1-1/16	CL-8-CLT-3.00	CL-8A-LPB	LS-1	3 - 6	10 - 125

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Complete Assembly (Metric)

QUANTITY	PART NO.	A DIA NOMINAL (mm)	A DIA ACTUAL +0/-0.013 (mm)	B SCREW LENGTH (mm)	P BUSHING LENGTH UNDER HEAD	P (mm)	E THREAD	THREAD PITCH (mm)	F (mm)	G (mm)	L (mm)	M (mm)	N DIA NOMINAL (mm)	N DIA ACTUAL +0/-0.008 (mm)	R +0.8/-0.3 (mm)	S DIA (mm)	LOCATING SCREW (INCLUDED)	BUSHING (INCLUDED)	LOCKSCREW (INCLUDED)	TORQUE ADJUSTMENT RANGE (Nm)	END-FORCE ADJUSTMENT RANGE (N)
	CLM-6-CLTA-30	6	5.975	30	Standard	8	M6	1	10	14	18	3.8	10	10.038	16.5	22	CLM-6-CLT-30	CLM-6-LPB	LSM-3	.3 - .7	50 - 550
	CLM-8-CLTA-35	8	7.975	35	Standard	10	M8	1.25	12	17	23	7.4	13	13.043	16.5	22	CLM-8-CLT-35	CLM-8-LPB	LSM-3	.3 - .7	50 - 550
	CLM-8-CLTA-45	8	7.975	45	Standard	10	M8	1.25	12	17	33	7.4	13	13.043	16.5	22	CLM-8-CLT-45	CLM-8-LPB	LSM-3	.3 - .7	50 - 550
	CLM-8-CLTA-75	8	7.975	75	Standard	10	M8	1.25	12	17	63	7.4	13	13.043	16.5	22	CLM-8-CLT-75	CLM-8-LPB	LSM-3	.3 - .7	50 - 550
	CLM-10-CLTA-40	10	9.975	40	Standard	12	M10	1.5	14	19	28	11.4	16	16.043	16.5	22	CLM-10-CLT-40	CLM-10-LPB	LSM-3	.3 - .7	50 - 550
	CLM-10-CLTA-50	10	9.975	50	Standard	12	M10	1.5	14	19	38	11.4	16	16.043	16.5	22	CLM-10-CLT-50	CLM-10-LPB	LSM-3	.3 - .7	50 - 550
	CLM-10-CLTA-75	10	9.975	75	Standard	12	M10	1.5	14	19	63	11.4	16	16.043	16.5	22	CLM-10-CLT-75	CLM-10-LPB	LSM-3	.3 - .7	50 - 550
	CLM-12-CLTA-50	12	11.975	50	Standard	18	M12	1.75	20	26	38	17.3	20	20.046	18.5	26	CLM-12-CLT-50	CLM-12-LPB	LSM-3	.3 - .7	50 - 550
	CLM-12-CLTA-60	12	11.975	60	Standard	18	M12	1.75	20	26	48	17.3	20	20.046	18.5	26	CLM-12-CLT-60	CLM-12-LPB	LSM-3	.3 - .7	50 - 550
	CLM-12-CLTA-75	12	11.975	75	Standard	18	M12	1.75	20	26	63	17.3	20	20.046	18.5	26	CLM-12-CLT-75	CLM-12-LPB	LSM-3	.3 - .7	50 - 550

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Locating Screw Only (Inch)

QUANTITY	PART NO.	A DIA NOMINAL	A DIA ACTUAL +0/-0.0005	B SCREW LENGTH	C DIA	D DIA	E THREAD	F	G	H	TORQUE ADJUSTMENT RANGE (in-lbs)	END-FORCE ADJUSTMENT RANGE (lbs)
	CL-4-CLT-1.25	1/4	.2490	1-1/4	.73	1-3/16	1/4-20	.40	.59	1-7/32	3 - 6	10 - 125
	CL-5-CLT-1.38	5/16	.3115	1-3/8	.73	1-3/16	5/16-18	.47	.65	1-7/32	3 - 6	10 - 125
	CL-5-CLT-1.75	5/16	.3115	1-3/4	.73	1-3/16	5/16-18	.47	.65	1-7/32	3 - 6	10 - 125
	CL-5-CLT-3.00	5/16	.3115	3	.73	1-3/16	5/16-18	.47	.65	1-7/32	3 - 6	10 - 125
	CL-6-CLT-1.50	3/8	.3740	1-1/2	.73	1-3/16	3/8-16	.56	.75	1-7/32	3 - 6	10 - 125
	CL-6-CLT-2.00	3/8	.3740	2	.73	1-3/16	3/8-16	.56	.75	1-7/32	3 - 6	10 - 125
	CL-6-CLT-3.00	3/8	.3740	3	.73	1-3/16	3/8-16	.56	.75	1-7/32	3 - 6	10 - 125
	CL-8-CLT-1.50	1/2	.4990	1-1/2	.73	1-3/16	1/2-13	.75	.93	1-7/32	3 - 6	10 - 125
	CL-8-CLT-2.00	1/2	.4990	2	.73	1-3/16	1/2-13	.75	.93	1-7/32	3 - 6	10 - 125
	CL-8-CLT-3.00	1/2	.4990	3	.73	1-3/16	1/2-13	.75	.93	1-7/32	3 - 6	10 - 125

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Locating Screw Only (Metric)

QUANTITY	PART NO.	A DIA NOMINAL (mm)	A DIA ACTUAL +0/-0.013 (mm)	B SCREW LENGTH (mm)	C DIA (mm)	D DIA (mm)	E THREAD	THREAD PITCH (mm)	F (mm)	G (mm)	H (mm)	TORQUE ADJUSTMENT RANGE (Nm)	END-FORCE ADJUSTMENT RANGE (N)
	CLM-6-CLT-30	6	5.975	30	18.5	30.2	M6	1	10	14	31	.3 - .7	50 - 550
	CLM-8-CLT-35	8	7.975	35	18.5	30.2	M8	1.25	12	17	31	.3 - .7	50 - 550
	CLM-8-CLT-45	8	7.975	45	18.5	30.2	M8	1.25	12	17	31	.3 - .7	50 - 550
	CLM-8-CLT-75	8	7.975	75	18.5	30.2	M8	1.25	12	17	31	.3 - .7	50 - 550
	CLM-10-CLT-40	10	9.975	40	18.5	30.2	M10	1.5	14	19	31	.3 - .7	50 - 550
	CLM-10-CLT-50	10	9.975	50	18.5	30.2	M10	1.5	14	19	31	.3 - .7	50 - 550
	CLM-10-CLT-75	10	9.975	75	18.5	30.2	M10	1.5	14	19	31	.3 - .7	50 - 550
	CLM-12-CLT-50	12	11.975	50	18.5	30.2	M12	1.75	20	26	31	.3 - .7	50 - 550
	CLM-12-CLT-60	12	11.975	60	18.5	30.2	M12	1.75	20	26	31	.3 - .7	50 - 550
	CLM-12-CLT-75	12	11.975	75	18.5	30.2	M12	1.75	20	26	31	.3 - .7	50 - 550

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