Seal-Lock® Self Tapping Solid Repair Inserts

The best solid repair system available! Unlike ordinary helically coiled inserts, Seal-Lock® inserts are solid bushings that provide a precision fit for spark plug threads that will never cause compression leaks. And since they are self tapping, they will never back out when spark plug is removed.

Choose one of the kits (#20004, #20005, or #20007) above.

Seal-Lock® Self Tapping Thread Repair Inserts

Guaranteed superior to any other thread repair system or your money back! Now you can replace stripped, worn, or damaged threads in Cast Iron, Aluminum, Magnesium, Copper, Brass, Bronze, Steel, etc. with Solid Steel Threads without taps or special tools. Your new threads are stronger, more durable, corrosion resistant, vibration proof, and pressure proof.

Choose from one of the kits above (#400, #500, #600 , or #700) or individually below:

Thread Size	Qty.	Drill Size	Part #
6-32	50	#6	40062
6-40	50	#6	40064
M4 x 0 .7	50	A	40120
8-32	50	A	40125
8-36	50	A	40136
M5 x 0.8	50	9/32”	40140
10-24	50	9/32”	40149
10-32	50	19/64”	40187
M6 x 1.0	40	5/16”	40236
1/4-20	40	5/16”	40250
1/4”-28	40	5/16”	40278
5/16-18	25	7/16”	40312
5/16-24	25	3/8”	40324
M8 x 1.25	25	3/8”	40325
M9 x 1.25	20	15/32”	40354
3/8 -16	20	17/32”	40375
3/8-24	20	31/64”	40379
M10x1.25	15	43/64”	40390
M10x1.5	15	9/16”	40393
M10x1.75	15	9/16”	40399
M11x1.5	15	9/16”	40433
7/16-14	15	9/16”	40437
7/16-20	15	9/16”	40457
M12x1.75	10	19/32”	40472
1/2”-13	10	5/8”	40500
1/2”-20	10	43/64”	40520
9/16-12	10	43/64”	40562
5/8-11	10	3/4”	40625
3/4-10	10	63/64”	40750