Keysert® Key-Locking Screw Thread Inserts

Inch and Metric

Easy Installation
Installed with standard drills and taps
No pre-winder required
No tang break-off.
Locking keys provide a positive mechanical lock, preventing rotation due to vibration or torsion.
Can be used in most materials
Aluminum, magnesium, cast iron, cold rolled steel and plastic
Provide high strength and reliability. One length per size provides maximum pullout strength. Breaks Grade 8 bolts in test after test.
Easy to remove
No special skills required. Installation procedures can be learned in minutes.

Installation

1	2	3	4

Drill out old threads with a standard drill.Note: Drill is oversized see charts for proper dimensions. Chamfer the hole with a standard countersink (82° -100° )	Tap new thread with a standard tap. See charts for proper size and depth .	Screw in the insert until slightly below surface.	Drive keys down with several hammer taps on the proper installation tool.

Removal

1	2	3	4

Drill out old material between keys and internal thread with a standard drill to specified depth (refer to charts for proper dimensions).	Deflect keys inward and break off.	Remove insert using a Drill-out, E-Z out, or similar type tool.	Same size replacement insert may be installed in the original hole.

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Threaded Inserts

Available in Inch and Metric sizes.
Available in Carbon Steel (C1215 or equivalent) or Stainless Steel (303)

Series "KST" Thinwall Inserts Carbon Steel
Series "KSST" Thinwall Inserts Stainless Steel
Internal Thread Size
KST
KSST *External Thread Size (Mod.) Length Installation Data Removal Data

Tap Drill Size C'Sink Dia. Tap Size Insert Tool Part No. Drill

Size Depth

10-24 5/16-18 .31 "I" .32 5/16-18 IT10T 7/32" 5/32

10-32

1/4-20 3/8-16 .37 "Q" .38 3/8-16 IT1/4T 9/32 3/16

1/4-28

5/16-18 7/16-14 .43 "X" .44 7/16-14 IT5/16T 11/32 3/16

5/16-24

3/8-16 1/2-13 .50 29/64 .51 1/2-13 IT3/8T 13/32 3/16

3/8-24

7/16-14 9/16-12 .56 33/64 .57 9/16-12 IT7/16T 15/32 3/16

7/16-20

1/2-13 5/8-11 .62 37/64 .63 5/8-11 IT1/2T 17/32 3/16

1/2-20

* For reference only.

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Series "KSH" Heavy Duty Inserts Carbon Steel
Series "KSSH" Heavy Duty Inserts Stainless Steel
Internal Thread Size
KSH
KSSH *External Thread Size (Mod.) Length Installation Data Removal Data

Tap Drill Size C'Sink Dia. Tap Size Insert Tool Part No. Drill

Size Depth

8-32 5/16-18 .31 "I" .32 5/16-18 IT8H 7/32 1/8

10-24 3/8-16 .31 "Q" .38 3/8-16 IT10H 9/32 1/8

10-32

1/4-20 7/16-14 .37 "X" .44 7/16-14 IT1/4H 11/32 3/16

1/4-28

5/16-18 1/2-13 .43 29/64 .51 1/2-13 IT5/16H 13/32 3/16

5/16-24

3/8-16 9/16-12 .50 33/64 .57 9/16-12 IT3/8H 15/32 3/16

3/8-24

7/16-14 5/8-11 .62 37/64 .63 5/8-11 IT7/16H 17/32 3/16

7/16-20

1/2-13 3/4-16 45/64 .76 3/4-16 IT1/2H 21/32 3/16

1/2-20

9/16-12 3/4-16 .81 IT9/16H

9/16-18

5/8-11 7/8-14 .87 53/64 .88 7/8-14 IT5/8H 25/32 3/16

5/8-18

3/4-10 1-1/8-12 1.12 1-1/16 1.14 1-1/8-12 IT3/4H 31/32 5/16

3/4-16

7/8-9 1-1/4-12 1.25 1-3/16 1.27 1-1/4-12 IT7/8H 1-3/32 5/16

7/8-14

1-8 1-3/8-12 1.37 1-5/16 1.39 1-3/8-12 IT1H 1-7/32 5/16

1-12 **

1-14 **

1-1/8-7 ** 1-1/2-12 1.62 1-7/16 1.52 1-1/2-12 IT118H 1-11/32 5/16

1-1/8-12 **

1-1/4-7 ** 1-5/8-12 1.81 1-9/16 1.64 1-5/8-12 IT114H 1-15/32 5/16

1-1/4-12 **

1-1/2-6 ** 1-7/8-12 2.00 1-13/16 1.89 1-7/8-12 IT112H 1-23/32 5/16

1-1/2-12 **

* For reference only.

** Not Available in KSSH ( stainless steel )

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Series"KSTM" Thinwall Metric Inserts Carbon Steel
"KSSTM" Stainless Steel Thinwall Metric Inserts
Internal Thread Size
KSTM
KSSTM *External Thread Size (Mod.) Length Installation Data Removal Data

Tap Drill Size C'Sink Dia. Tap Size Insert Tool Part No. Drill

Size Depth

M5x0.8 M8x1.25 8.0 6.9 8.25 8x1.25 ITM5T 5.5 4

M6x1.0 M10x1.25 10 8.8 10.25 10x1.25 ITM6T 7.5 4.75

M8x1.25 M12x1.25 12 10.8 12.25 12x1.25 ITM8T 9.5 4.75

M8x1

M10x1.5 M14x1.5 14.0 12.8 14.25 14x1.5 ITM10T 11.5 4.75

M10x1.25

M12x1.75 M16x1.5 16.0 14.75 16.25 16x1.5 ITM12T 13.5 4.75

M12x1.25

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Series"KSHM" Heavy Duty Metric Inserts Carbon Steel
Series "KSSHM" Stainless Steel Heavy Duty Metric Inserts
Internal Thread Size
KSHM
KSSHM *External Thread Size (Mod.) Length Installation Data Removal Data

Tap Drill Size C'Sink Dia. Tap Size Insert Tool Part No. Drill

Size Depth

M4x.7 M8x1.25 8.0 6.9 8.25 8x1.25 ITM4H 5.5 4

M5x.8 M10x1.25 10 8.8 10.25 10x1.25 ITM5H 7.5 4.75

M6x1 M12x1.25 12 10.8 12.25 12x1.25 ITM6H 9.5 4.75

M8x1.25 M14x1.5 14.0 12.8 14.25 14x1.5 ITM8H 11.5 4.75

M8x1

M10x1.5 M16x1.5 16.0 14.75 16.25 16x1.5 ITM10H 13.5 4.75

M10x1.25

M12x1.75 M18x1.5 18 16.75 18.25 18x1.5 ITM18H 15.5 4.75

M12x1.25

M14x2.0 M20x1.5 20 18.75 20.25 M20x1.5 ITM14H 17.5 4.75

M14x1.5

M16x2 M22x1.5 22 20.5 22.5 22x1.5 ITM16H 17.75 6.35

M16x1.5

M18x1.5 M24x1.5 24 22.5 24.25 24x1.5 ITM18H 19.75 6.35

M20x2.5 M30x2.0 30 28 30.25 M30x2 ITM20H 27.75 6.35

M20x1.5

M22x1.5 M32x2.0 32 30 32.25 32x2 ITM22H 27.75 6.35

M24x3.0 M33x2.0 33 31 33.25 33x2 ITM24H 28.75 6.35

M24x2

* For reference only.

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Series **"KST"** Thinwall Inserts Carbon Steel
Series **"KSST"** Thinwall Inserts Stainless Steel
Internal Thread Size KST KSST	*External Thread Size (Mod.)	Length	Installation Data	Removal Data
Tap Drill Size	C'Sink Dia.	Tap Size	Insert Tool Part No.	Drill
Size	Depth
10-24	5/16-18	.31	"I"	.32	5/16-18	IT10T	7/32"	5/32
10-32
1/4-20	3/8-16	.37	"Q"	.38	3/8-16	IT1/4T	9/32	3/16
1/4-28
5/16-18	7/16-14	.43	"X"	.44	7/16-14	IT5/16T	11/32	3/16
5/16-24
3/8-16	1/2-13	.50	29/64	.51	1/2-13	IT3/8T	13/32	3/16
3/8-24
7/16-14	9/16-12	.56	33/64	.57	9/16-12	IT7/16T	15/32	3/16
7/16-20
1/2-13	5/8-11	.62	37/64	.63	5/8-11	IT1/2T	17/32	3/16
1/2-20

Series **"KSH"** Heavy Duty Inserts Carbon Steel
Series **"KSSH"** Heavy Duty Inserts Stainless Steel
Internal Thread Size KSH KSSH	*External Thread Size (Mod.)	Length	Installation Data	Removal Data
Tap Drill Size	C'Sink Dia.	Tap Size	Insert Tool Part No.	Drill
Size	Depth
8-32	5/16-18	.31	"I"	.32	5/16-18	IT8H	7/32	1/8
10-24	3/8-16	.31	"Q"	.38	3/8-16	IT10H	9/32	1/8
10-32
1/4-20	7/16-14	.37	"X"	.44	7/16-14	IT1/4H	11/32	3/16
1/4-28
5/16-18	1/2-13	.43	29/64	.51	1/2-13	IT5/16H	13/32	3/16
5/16-24
3/8-16	9/16-12	.50	33/64	.57	9/16-12	IT3/8H	15/32	3/16
3/8-24
7/16-14	5/8-11	.62	37/64	.63	5/8-11	IT7/16H	17/32	3/16
7/16-20
1/2-13	3/4-16	45/64	.76	3/4-16	IT1/2H	21/32	3/16
1/2-20
9/16-12	3/4-16	.81	IT9/16H
9/16-18
5/8-11	7/8-14	.87	53/64	.88	7/8-14	IT5/8H	25/32	3/16
5/8-18
3/4-10	1-1/8-12	1.12	1-1/16	1.14	1-1/8-12	IT3/4H	31/32	5/16
3/4-16
7/8-9	1-1/4-12	1.25	1-3/16	1.27	1-1/4-12	IT7/8H	1-3/32	5/16
7/8-14
1-8	1-3/8-12	1.37	1-5/16	1.39	1-3/8-12	IT1H	1-7/32	5/16
1-12 **
1-14 **
1-1/8-7 **	1-1/2-12	1.62	1-7/16	1.52	1-1/2-12	IT118H	1-11/32	5/16
1-1/8-12 **
1-1/4-7 **	1-5/8-12	1.81	1-9/16	1.64	1-5/8-12	IT114H	1-15/32	5/16
1-1/4-12 **
1-1/2-6 **	1-7/8-12	2.00	1-13/16	1.89	1-7/8-12	IT112H	1-23/32	5/16
1-1/2-12 **

Series"KSTM" Thinwall Metric Inserts Carbon Steel
**"KSSTM"** Stainless Steel Thinwall Metric Inserts
Internal Thread Size KSTM KSSTM	*External Thread Size (Mod.)	Length	Installation Data	Removal Data
Tap Drill Size	C'Sink Dia.	Tap Size	Insert Tool Part No.	Drill
Size	Depth
M5x0.8	M8x1.25	8.0	6.9	8.25	8x1.25	ITM5T	5.5	4
M6x1.0	M10x1.25	10	8.8	10.25	10x1.25	ITM6T	7.5	4.75
M8x1.25	M12x1.25	12	10.8	12.25	12x1.25	ITM8T	9.5	4.75
M8x1
M10x1.5	M14x1.5	14.0	12.8	14.25	14x1.5	ITM10T	11.5	4.75
M10x1.25
M12x1.75	M16x1.5	16.0	14.75	16.25	16x1.5	ITM12T	13.5	4.75
M12x1.25

Series"KSHM" Heavy Duty Metric Inserts Carbon Steel
Series **"KSSHM"** Stainless Steel Heavy Duty Metric Inserts
Internal Thread Size KSHM KSSHM	*External Thread Size (Mod.)	Length	Installation Data	Removal Data
Tap Drill Size	C'Sink Dia.	Tap Size	Insert Tool Part No.	Drill
Size	Depth
M4x.7	M8x1.25	8.0	6.9	8.25	8x1.25	ITM4H	5.5	4
M5x.8	M10x1.25	10	8.8	10.25	10x1.25	ITM5H	7.5	4.75
M6x1	M12x1.25	12	10.8	12.25	12x1.25	ITM6H	9.5	4.75
M8x1.25	M14x1.5	14.0	12.8	14.25	14x1.5	ITM8H	11.5	4.75
M8x1
M10x1.5	M16x1.5	16.0	14.75	16.25	16x1.5	ITM10H	13.5	4.75
M10x1.25
M12x1.75	M18x1.5	18	16.75	18.25	18x1.5	ITM18H	15.5	4.75
M12x1.25
M14x2.0	M20x1.5	20	18.75	20.25	M20x1.5	ITM14H	17.5	4.75
M14x1.5
M16x2	M22x1.5	22	20.5	22.5	22x1.5	ITM16H	17.75	6.35
M16x1.5
M18x1.5	M24x1.5	24	22.5	24.25	24x1.5	ITM18H	19.75	6.35
M20x2.5	M30x2.0	30	28	30.25	M30x2	ITM20H	27.75	6.35
M20x1.5
M22x1.5	M32x2.0	32	30	32.25	32x2	ITM22H	27.75	6.35
M24x3.0	M33x2.0	33	31	33.25	33x2	ITM24H	28.75	6.35
M24x2

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