Recommended Torque Table For Bolts And Nuts -

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Recommended torque table for bolts and nuts
Recommended torque table for bolts and nuts		6.8		8.8		10.9		12.9
Minimum breaking strength		588Mpa		784Mpa		941Mpa		1176Mpa
The material		Mechanical structural steel		Chromium molybdenum alloy steel		Ni-crmo alloy steel		Ni-crmo alloy steel
Bolt M=	Nut S=	Recommended torque value		Recommended torque value		Recommended torque value		Recommended torque value
Bolt M=	Nut S=	Kgm	Nm	Kgm	Nm	Kgm	Nm	Kgm	Nm
14	22	10	98	14	137	17	165	23	225
16	24	14	137	21	206	25	247	36	353
18	27	21	206	29	284	35	341	49	480
20	30	28	296	41	402	58	569	69	676
22	32	34	333	55	539	78	765	93	911
24	36	48	470	70	686	100	981	120	1176
27	41	65	637	105	1029	150	1472	180	1764
30	46	90	882	125	1225	200	1962	240	2352
33	50	115	1127	150	1470	210	2060	250	2450
36	55	150	1470	180	1764	250	2453	300	2940
39	60	180	1764	220	2156	300	2943	370	3626
42	65	240	2352	280	2744	390	3826	470	4606
45	70	280	2744	320	3136	450	4415	550	5390
48	75	350	3430	400	3920	570	5592	680	6664
52	80	420	4116	480	4704	670	6573	850	8330
56	85	530	5149	610	5978	860	8437	1050	10290
60	90	610	5978	790	7742	1100	10791	1350	13230
64	95	760	7448	900	8820	1350	13230	1650	16170
68	100	870	8526	1100	10780	1650	16170	2020	19796
72	105	1000	9800	1290	12642	2020	19796	2450	24000
76	110	1100	10780	1500	14700	2400	23520	2900	28420
80	115	1250	12250	1850	18130	2820	27636	3420	33516

Note:

1. The above is the German industrial standard. The torque value of the nut in the table is measured when the bolt reaches 70% of the yield limit.

2. The recommended value of locking torque is: ×80% of the data in the table. For example, M48,8.8 bolt, the locking torque is 400×80%=320KGM.

3, the release torque value is 1.5~2 times of the locking torque.

For example, if the locking torque in the above example is 320KGM, the release torque is about 320×(1.5~2)= 480-640kgm.

1. It is recommended that the locking torque be multiplied by 80%-90% of the data in the table, and the torque requirements in the device installation prevail.

2. If it is a high temperature and high pressure container to be calculated, or with the torque value in the table 100% lock;

Recommended: the pressure in the container or pipeline is 0-80 bar. It is recommended that the installation torque is multiplied by 90%-100% of the data in the table.

The pressure in the vessel or pipeline is 80-120Bar. It is recommended that the installation torque be multiplied by 100%-120% of the data in the table.

If the pressure in the vessel or pipeline is above 120Bar, it is recommended that the installation torque be multiplied by 120%-130% of the data in the table.