Key Inserts – Heavy Duty, Stainless Steel, Internal Thread Locking (Inch)

Threaded Inserts

Product Information

Key Inserts – Heavy Duty, Stainless Steel, Internal Thread Locking (Inch)

Internal-thread-locking version of our heavy-duty inserts. These general-purpose threaded inserts have a thick, heavy-duty thread wall. Key Inserts are ideal for thread reinforcement, especially when the mating stud or bolt will be removed frequently. These stainless inserts provide strong, permanent stainless steel threads in 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 with internal thread locking are available in the following inch ID thread sizes:

1/4-20 to 3/4-10 UNC Coarse

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

Internal Thread Locking

This feature uses a modified internal thread to prevent the installed bolt or stud from rotating. This feature is useful for one-time, permanent installations.

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	MINIMUM THREAD DEPTH	STANDARD TAP
CL-1420-SKSL	X	.447	.43	7/16-14
CL-51618-SKSL	29/64	.510	.50	1/2-13
CL-3816-SKSL	33/64	.572	.56	9/16-12
CL-1213-SKSL	41/64	.700	.75	11/16-11 NS
CL-5811-SKSL	53/64	.885	1.00	7/8-14
CL-3410-SKSL	1-1/16	1.145	1.31	1-1/8"-12

REMOVAL DATA
PART NO.	REMOVAL DRILL SIZE	REMOVAL DRILL DEPTH
CL-1420-SKSL	11/32	3/16
CL-51618-SKSL	13/32	3/16
CL-3816-SKSL	15/32	3/16
CL-1213-SKSL	19/32	3/16
CL-5811-SKSL	25/32	3/16
CL-3410-SKSL	31/32	5/16

Material

ITEM	MATERIAL	HEAT TREAT	FINISH	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, Internal Thread Locking (Inch)

Key Insert

PART NO.	INTERNAL THREAD	EXTERNAL THREAD	LENGTH	SHEAR ENGAGEMENT AREA (sq in.)	MS EQUIVALENT
CL-1420-SKSL	1/4-20	7/16-14	.37	.197	MS 51831-102L
CL-51618-SKSL	5/16-18	1/2-13	.43	.261	MS 51831-103L
CL-3816-SKSL	3/8-16	9/16-12	.50	.384	MS 51831-104L
CL-1213-SKSL	1/2-13	11/16-11 NS	.68	.737	MS 51831-106L
CL-5811-SKSL	5/8-11	7/8-14	.87	1.242	MS 51831-108L
CL-3410-SKSL	3/4-10	1-1/8"-12	1.25	2.448	MS 51831-109L