KATO Fastening Systems, Inc.

Locking Torques

KATO Locking Torque Values for Tangless and Tanged CoilThread Inserts

Unified Thread Sizes

Metric Tread Sizes

Nominal Thread Size	Maximum Locking Torque		Minimum Locking Torque 15th Cycle
Unified Coarse
2-56	20.0	oz-in	3.0	oz-in
3-48	32.0	oz-in	7.0	oz-in
4-40	48.0	oz-in	10.0	oz-in
5-40	75.0	oz-in	13.0	oz-in
6-32	6.0	lbf-in	1.0	lbf-in
8-32	9.0	lbf-in	1.5	lbf-in
10-24	13.0	lbf-in	2.0	lbf-in
12-24	24.0	lbf-in	3.0	lbf-in
1/4-20	30.0	lbf-in	4.5	lbf-in
5/16-18	60.0	lbf-in	7.5	lbf-in
3/8-16	80.0	lbf-in	12.0	lbf-in
7/16-14	100.0	lbf-in	16.5	lbf-in
1/2-13	150.0	lbf-in	24.0	lbf-in
9/16-12	200.0	lbf-in	30.0	lbf-in
5/8-11	300.0	lbf-in	40.0	lbf-in
3/4-10	400.0	lbf-in	60.0	lbf-in
7/8-9	600.0	lbf-in	82.0	lbf-in
1-8	800.0	lbf-in	110.0	lbf-in
1 1/8-7	900.0	lbf-in	137.0	lbf-in
1 1/4-7	1000.0	lbf-in	165.0	lbf-in
1 3/8-6	1150.0	lbf-in	185.0	lbf-in
1 1/2-6	1350.0	lbf-in	210.0	lbf-in
Unified Fine
3-56	32.0	oz-in	7.0	oz-in
4-48	48.0	oz-in	10.0	oz-in
6-40	6.0	lbf-in	1.0	lbf-in
8-36	9.0	lbf-in	1.5	lbf-in
10-32	13.0	lbf-in	2.0	lbf-in
1/4-28	30.0	lbf-in	3.5	lbf-in
5/16-24	60.0	lbf-in	6.5	lbf-in
3/8-24	80.0	lbf-in	9.5	lbf-in
7/16-20	100.0	lbf-in	14.0	lbf-in
1/2-20	150.0	lbf-in	18.0	lbf-in
9/16-18	200.0	lbf-in	24.0	lbf-in
5/8-18	300.0	lbf-in	32.0	lbf-in
3/4-16	400.0	lbf-in	50.0	lbf-in
7/8-14	600.0	lbf-in	70.0	lbf-in
1-12	800.0	lbf-in	90.0	lbf-in
1 1/8-12	900.0	lbf-in	117.0	lbf-in
1 1/4-12	1000.0	lbf-in	143.0	lbf-in
1 3/8-12	1150.0	lbf-in	165.0	lbf-in
1 1/2-12	1350.0	lbf-in	190.0	lbf-in

Nominal Thread Size	Maximum Locking Torque		Minimum Locking Torque 15th Cycle
Metric Coarse Series
M2.2X0.45	0.14	N.m	0.02	N.m
M2.5X0.45	0.23	N.m	0.05	N.m
M3X0.5	0.45	N.m	0.10	N.m
M3.5X0.6	0.68	N.m	0.12	N.m
M4X0.7	0.90	N.m	0.15	N.m
M5X0.8	1.60	N.m	0.30	N.m
M6X1	3.00	N.m	0.40	N.m
M7X1	4.50	N.m	0.60	N.m
M8X1.25	6.00	N.m	0.80	N.m
M10X1.5	10.50	N.m	1.40	N.m
M12X1.75	15.50	N.m	2.10	N.m
M14X2	23.50	N.m	3.00	N.m
M16X2	31.50	N.m	4.20	N.m
M18X2.5	42.00	N.m	5.50	N.m
M20X2.5	54.00	N.m	7.00	N.m
M22X2.5	67.50	N.m	9.00	N.m
M24X3	80.00	N.m	10.50	N.m
M27X3	94.00	N.m	12.00	N.m
M30X3.5	108.00	N.m	14.00	N.m
M33X3.5	122.00	N.m	15.50	N.m
M36X4	136.00	N.m	17.50	N.m
M30X4	150.00	N.m	19.50	N.m
Metric Fine Series
M8X1	6.00	N.m	0.80	N.m
M10X1	10.50	N.m	1.40	N.m
M10X1.25*	10.50	N.m	1.40	N.m
M12X1.25*	15.50	N.m	2.10	N.m
M12X1.5*	15.50	N.m	2.10	N.m
M14X1.5*	23.50	N.m	3.00	N.m
M16X1.5*	31.50	N.m	4.20	N.m
M18X1.5*	42.00	N.m	5.50	N.m
M20X1.5*	54.00	N.m	7.00	N.m
M22X1.5*	67.50	N.m	9.00	N.m
M18X2	42.00	N.m	5.50	N.m
M20X2	54.00	N.m	7.00	N.m
M22X2	67.50	N.m	9.00	N.m
M24X2	80.00	N.m	10.50	N.m
M27X2	94.00	N.m	12.00	N.m
M30X2	108.00	N.m	14.00	N.m
M33X2	122.00	N.m	15.50	N.m
M36X2	136.00	N.m	17.50	N.m
M39X2	150.00	N.m	19.50	N.m
M36X3	136.00	N.m	17.50	N.m
M39X3	150.00	N.m	19.50	N.m

Notes:

Unified CoilThread locking inserts conform to NASM21209, when tested in accordance to NASM8846.
Metric CoilThread locking inserts conform to MA3329-MA3331, when tested in accordance to MA1565.
Unified Tangless locking inserts conform to NAS1130, when tested in accordance to NASM8846.