Key Inserts – Heavy Duty, Stainless Steel (Inch)

Threaded Inserts

Product Information

General-purpose threaded inserts with a thick, heavy-duty thread wall, suitable for most applications. Key Inserts are ideal for thread reinforcement, especially when the mating stud or bolt will be removed frequently. They provide strong, permanent steel threads in almost any parent material – ferrous, non-ferrous, or non-metallic. Key Inserts are also well suited for quick repair of stripped, damaged, or worn threads. Locking keys positively prevent the insert from rotating.

Heavy-duty stainless steel Key Inserts are available in a wide range of inch and metric ID thread sizes. The following inch sizes are shown on this page:

#10-24 to 3/4-10 NC Coarse

#10-32 to 1/2-20 UNF Fine

Key Inserts are installed using standard drills and taps, but the required tap-drill size is slightly larger than normal for that OD thread size. See Installation Data table below for the appropriate tap-drill size.

Application Information

Key Inserts are often used to reinforce tapped holes in aluminum tooling plates.

Repair Kits contain an installation tool and several inserts of a given size.

Installation/Removal

Key Inserts are installed using standard drills and taps, but the required tap-drill size is slightly larger than normal for that OD thread size. See Installation Data table below for the appropriate tap-drill size. Locking keys must be driven down into the parent material during installation, providing a positive mechanical lock against rotation. See tables below for installation tools.

Click here for detailed Installation & Removal Instructions

INSTALLATION DATA
PART NO.	REQUIRED TAP DRILL	COUNTERSINK DIA (+.01/-0)	MINIMUM THREAD DEPTH	STANDARD TAP
CL-1024-SKS	Q	.38	.37	3/8-16
CL-1032-SKS	Q	.38	.37	3/8-16
CL-1420-SKS	X	.44	.43	7/16-14
CL-1428-SKS	X	.44	.43	7/16-14
CL-51618-SKS	29/64	.51	.50	1/2-13
CL-51624-SKS	29/64	.51	.50	1/2-13
CL-3816-SKS	33/64	.57	.56	9/16-12
CL-3824-SKS	33/64	.57	.56	9/16-12
CL-1213-SKS	45/64	.76	.68	3/4-16
CL-1220-SKS	45/64	.76	.68	3/4-16
CL-5811-SKS	53/64	.88	1.00	7/8-14
CL-3410-SKS	1-1/16	1.14	1.31	1-1/8"-12

REMOVAL DATA
PART NO.	REMOVAL DRILL SIZE	REMOVAL DRILL DEPTH
CL-1024-SKS	9/32	1/8
CL-1032-SKS	9/32	1/8
CL-1420-SKS	11/32	3/16
CL-1428-SKS	11/32	3/16
CL-51618-SKS	13/32	3/16
CL-51624-SKS	13/32	3/16
CL-3816-SKS	15/32	3/16
CL-3824-SKS	15/32	3/16
CL-1213-SKS	21/32	3/16
CL-1220-SKS	21/32	3/16
CL-5811-SKS	25/32	5/16
CL-3410-SKS	31/32	5/16

Material

ITEM	MATERIAL	HEAT TREAT	FINISH	DFARS	RoHS
Body	303 Stainless Steel	-	-	-	✔
Keys	302 Stainless Steel	-	-	-	✔

Click here for detailed material and finish specifications.

California residents click here for Prop 65 information.

Key Inserts – Heavy Duty, Stainless Steel (Inch)

Key Insert

PART NO.	INTERNAL THREAD	EXTERNAL THREAD	LENGTH	SHEAR ENGAGEMENT AREA (sq in)	MS EQUIVALENT	NAS EQUIVALENT
CL-1024-SKS	#10-24	3/8-16	.31	.190	MS 51831-101	—
CL-1032-SKS	#10-32	3/8-16	.31	.190	MS 51831-201	NAS 1395C3
CL-1420-SKS	1/4-20	7/16-14	.37	.284	MS 51831-102	—
CL-1428-SKS	1/4-28	7/16-14	.37	.284	MS 51831-202	NAS 1395C4
CL-51618-SKS	5/16-18	1/2-13	.43	.359	MS 51831-103	—
CL-3816-SKS	3/8-16	9/16-12	.50	.498	MS 51831-104	—
CL-3824-SKS	3/8-24	9/16-12	.50	.498	MS 51831-204	NAS 1395C6
CL-1213-SKS	1/2-13	3/4-16	.62	1.057	—	—
CL-1220-SKS	1/2-20	3/4-16	.62	1.057	—	—
CL-5811-SKS	5/8-11	7/8-14	.87	1.487	MS 51831-108	—
CL-3410-SKS	3/4-10	1-1/8"-12	1.12	2.490	MS 51831-109	—