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Adjustable-Torque Thumb Screws

Screw Clamps

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Product Information

Adjustable-Torque Thumb Screws Part # CL-312A-TS Carr Lane Mfg.®

Knurled-head thumb screw that 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. Adjustable-Torque Thumb Screws are furnished with your choice of swivel foot, and a Knurled Check Nut.

Available in body-thread sizes from #10-32 to 5/8-11 (M5 to M16 in metric), each in a choice of several lengths. Due to their small size, #10 and M5 thumb screws have a dog point instead of a swivel foot. Made in USA.

Application Information

Adjustment

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.

Swivel Foot

Diagram showcasing the application of Adjustable Torque Thumb Screws

Diagram showcasing the application of Adjustable Torque Thumb Screws

Type A Foot

Diagram showcasing the application of Adjustable Torque Thumb Screws

Type B Foot

Diagram showcasing the application of Adjustable Torque Thumb Screws

Type D Foot

Choice of three swivel-foot types. Adjustable-Torque Thumb Screws use our patented left-hand-thread swivel-foot system. The ball end of the body screws into the foot for easy installation and removal. Once the ball threads pass beyond the foot threads, the foot can rotate and pivot freely (20° total angle). Foot threads are left-hand to positively prevent accidental backout during use. Delrin® feet are optional for types A and B. To order with a Delrin® foot, add "N" to the part number, e.g. CL-415-TSAN. Note: Delrin® feet are not threaded – they snap on and off.

Material

ITEM	MATERIAL	HEAT TREAT	FINISH	DFARS	RoHS
Screw Body	1215 Steel	Caburized-Hardened	Black Oxide	✔	✔
Knob,Check Nut and Steel Foot	1215 Steel	-	Black Oxide	✔	✔
Spring	302 Stainless or Music Wire	-	-	✔	✔
Delrin® foot	White Delrin® 500	-	-	✔	✔

Click here for detailed material and finish specifications.

California residents click here for Prop 65 information.

Adjustable-Torque Thumb Screws

Version with Dog Point (Inch)

QUANTITY	PART NO.	A THREAD	B	C	D DIA	TORQUE ADJUSTMENT RANGE (in-lbs)	END-FORCE ADJUSTMENT RANGE (lbs)
	CL-312-TS	#10-24	1-1/4	21/32	15/16	3 - 6	10 - 125
	CL-312A-TS	#10-32	1-1/4	21/32	15/16	3 - 6	10 - 125

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Version with Type A Small Foot (Inch)

To order with a Delrin® foot, add "N" suffix to part number on Price & Availability screen.

QUANTITY	PART NO.	A THREAD	B	C	D DIA	TORQUE ADJUSTMENT RANGE (in-lbs)	END-FORCE ADJUSTMENT RANGE (lbs)
	CL-415-TSA	1/4-20	1-1/2	21/32	15/16	3 - 6	10 - 125
	CL-425-TSA	1/4-20	2-1/2	21/32	15/16	3 - 6	10 - 125
	CL-517-TSA	5/16-18	1-3/4	21/32	15/16	3 - 6	10 - 125
	CL-527-TSA	5/16-18	2-3/4	21/32	15/16	3 - 6	10 - 125
	CL-620-TSA	3/8-16	2	21/32	1-3/16	3 - 6	10 - 125
	CL-630-TSA	3/8-16	3	21/32	1-3/16	3 - 6	10 - 125
	CL-820-TSA	1/2-13	2	21/32	1-3/16	3 - 6	10 - 125
	CL-830-TSA	1/2-13	3	21/32	1-3/16	3 - 6	10 - 125
	CL-1020-TSA	5/8-11	2	21/32	1-3/16	3 - 6	10 - 125
	CL-1030-TSA	5/8-11	3	21/32	1-3/16	3 - 6	10 - 125

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Version with Type B Large Foot (Inch)

To order with a Delrin® foot, add "N" suffix to part number on Price & Availability screen.

QUANTITY	PART NO.	A THREAD	B	C	D DIA	TORQUE ADJUSTMENT RANGE (in-lbs)	END-FORCE ADJUSTMENT RANGE (lbs)
	CL-415-TSB	1/4-20	1-1/2	21/32	15/16	3 - 6	10 - 125
	CL-425-TSB	1/4-20	2-1/2	21/32	15/16	3 - 6	10 - 125
	CL-517-TSB	5/16-18	1-3/4	21/32	15/16	3 - 6	10 - 125
	CL-527-TSB	5/16-18	2-3/4	21/32	15/16	3 - 6	10 - 125
	CL-620-TSB	3/8-16	2	21/32	1-3/16	3 - 6	10 - 125
	CL-630-TSB	3/8-16	3	21/32	1-3/16	3 - 6	10 - 125
	CL-820-TSB	1/2-13	2	21/32	1-3/16	3 - 6	10 - 125
	CL-830-TSB	1/2-13	3	21/32	1-3/16	3 - 6	10 - 125
	CL-1020-TSB	5/8-11	2	21/32	1-3/16	3 - 6	10 - 125
	CL-1030-TSB	5/8-11	3	21/32	1-3/16	3 - 6	10 - 125

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Version with Type D Ball Foot (Inch)

QUANTITY	PART NO.	A THREAD	B	C	D DIA	TORQUE ADJUSTMENT RANGE (in-lbs)	END-FORCE ADJUSTMENT RANGE (lbs)
	CL-415-TSD	1/4-20	1-1/2	21/32	15/16	3 - 6	10 - 125
	CL-425-TSD	1/4-20	2-1/2	21/32	15/16	3 - 6	10 - 125
	CL-517-TSD	5/16-18	1-3/4	21/32	15/16	3 - 6	10 - 125
	CL-527-TSD	5/16-18	2-3/4	21/32	15/16	3 - 6	10 - 125
	CL-620-TSD	3/8-16	2	21/32	1-3/16	3 - 6	10 - 125
	CL-630-TSD	3/8-16	3	21/32	1-3/16	3 - 6	10 - 125
	CL-820-TSD	1/2-13	2	21/32	1-3/16	3 - 6	10 - 125
	CL-830-TSD	1/2-13	3	21/32	1-3/16	3 - 6	10 - 125
	CL-1020-TSD	5/8-11	2	21/32	1-3/16	3 - 6	10 - 125
	CL-1030-TSD	5/8-11	3	21/32	1-3/16	3 - 6	10 - 125

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Version with Dog Point (Metric)

QUANTITY	PART NO.	A THREAD	THREAD PITCH (mm)	B (mm)	C (mm)	D DIA (mm)	TORQUE ADJUSTMENT RANGE (Nm)	END-FORCE ADJUSTMENT RANGE (N)
	CLM-5-TS	M5	.8	30	16.5	24	.3 - .7	50 - 550

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Version with Type A Small Foot (Metric)

To order with a Delrin® foot, add "N" suffix to part number on Price & Availability screen.

QUANTITY	PART NO.	A THREAD	THREAD PITCH (mm)	B (mm)	C (mm)	D DIA (mm)	TORQUE ADJUSTMENT RANGE (Nm)	END-FORCE ADJUSTMENT RANGE (N)
	CLM-6-TSA	M6	1	64	16.5	24	.3 - .7	50 - 550
	CLM-8-TSA	M8	1.25	69	16.5	24	.3 - .7	50 - 550
	CLM-10-TSA	M10	1.5	74	16.5	30	.3 - .7	50 - 550
	CLM-12-TSA	M12	1.75	73	16.5	30	.3 - .7	50 - 550
	CLM-16-TSA	M16	2	73	16.5	30	.3 - .7	50 - 550

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Version with Type B Large Foot (Metric)

To order with a Delrin® foot, add "N" suffix to part number on Price & Availability screen.

QUANTITY	PART NO.	A THREAD	THREAD PITCH (mm)	B (mm)	C (mm)	D DIA (mm)	TORQUE ADJUSTMENT RANGE (Nm)	END-FORCE ADJUSTMENT RANGE (N)
	CLM-6-TSB	M6	1	64	16.5	24	.3 - .7	50 - 550
	CLM-8-TSB	M8	1.25	69	16.5	24	.3 - .7	50 - 550
	CLM-10-TSB	M10	1.5	74	16.5	30	.3 - .7	50 - 550
	CLM-12-TSB	M12	1.75	73	16.5	30	.3 - .7	50 - 550
	CLM-16-TSB	M16	2	73	16.5	30	.3 - .7	50 - 550

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Version with Type D Ball Foot (Metric)

QUANTITY	PART NO.	A THREAD	THREAD PITCH (mm)	B (mm)	C (mm)	D DIA (mm)	TORQUE ADJUSTMENT RANGE (Nm)	END-FORCE ADJUSTMENT RANGE (N)
	CLM-6-TSD	M6	1	64	16.5	24	.3 - .7	50 - 550
	CLM-8-TSD	M8	1.25	69	16.5	24	.3 - .7	50 - 550
	CLM-10-TSD	M10	1.5	74	16.5	30	.3 - .7	50 - 550
	CLM-12-TSD	M12	1.75	73	16.5	30	.3 - .7	50 - 550
	CLM-16-TSD	M16	2	73	16.5	30	.3 - .7	50 - 550

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