Torque Conversion Charts

Strap Wrench Torque Conversion Charts

These torque conversion charts were calculated for the BT-ST-302D Digital Torque Tool.

BT-BS-618B & BT-BS-611B

TORQUE CONVERSION CHART
For All BT-BS-611 & BT-BS-618 Strap Wrenches
For All BT-BS-611 & BT-BS-618 Strap Wrenches
Diameter of Part Being Tightened	Desired Torque Value (in-lbs)
Diameter of Part Being Tightened	40	60	80	100	120	140	160	180	200
1.00"	33	50	67	83	100	117	134	150	167
1.50"	33	50	66	83	99	116	132	149	165
1.75"	33	49	65	82	98	114	131	147	163
2.00"	32	48	64	80	96	112	128	144	160
2.25"	32	48	63	79	95	111	127	143	158
2.50"	31	47	63	78	94	110	126	141	157
2.75"	31	47	62	78	93	109	124	140	155
3.00"	31	46	62	77	92	108	123	138	154
3.25"	30	46	61	76	91	107	122	137	152
3.50"	30	45	60	75	90	106	121	136	151
3.75"	30	45	60	75	90	105	119	134	149
4.00"	30	44	59	74	89	104	118	133	148

For All BT-BS-611 & BT-BS-618 Strap Wrenches
For All BT-BS-611 & BT-BS-618 Strap Wrenches
Diameter of Part Being Tightened	Desired Torque Value (in-lbs)
Diameter of Part Being Tightened	40	60	80	100	120	140	160	180	200
1.00"	33	50	67	83	100	117	134	150	167
1.50"	33	50	66	83	99	116	132	149	165
1.75"	33	49	65	82	98	114	131	147	163
2.00"	32	48	64	80	96	112	128	144	160
2.25"	32	48	63	79	95	111	127	143	158
2.50"	31	47	63	78	94	110	126	141	157
2.75"	31	47	62	78	93	109	124	140	155
3.00"	31	46	62	77	92	108	123	138	154
3.25"	30	46	61	76	91	107	122	137	152
3.50"	30	45	60	75	90	106	121	136	151
3.75"	30	45	60	75	90	105	119	134	149
4.00"	30	44	59	74	89	104	118	133	148

BT-BS-610B

For All BT-BS-610 Strap Wrenches
For All BT-BS-610 Strap Wrenches
Diameter of Part Being Tightened	Desired Torque Value (in-lbs)
Diameter of Part Being Tightened	40	60	80	100	120	140	160	180	200
0.25"	36	54	72	89	107	125	143	161	179
0.50"	35	52	70	87	104	122	139	156	174
0.75"	34	51	68	86	103	120	137	154	171
1.00"	34	51	67	84	101	118	135	152	169
1.50"	33	49	65	81	98	114	130	146	163
1.75"	34	51	68	84	101	118	135	152	169
2.00"	33	50	67	83	100	117	133	150	166
2.25"	33	49	66	82	99	115	132	148	165
2.50"	32	49	65	81	97	113	130	146	162

BT-BS-609B

For All BT-BS-609 Strap Wrenches
For All BT-BS-609 Strap Wrenches
Diameter of Part Being Tightened	Desired Torque Value (in-lbs)
Diameter of Part Being Tightened	40	60	80	100	120	140	160	180
0.50"	35	53	70	88	106	123	141	158
0.75"	35	52	70	87	105	122	139	157
1.00"	34	52	69	86	103	121	138	155
1.50"	34	51	67	84	101	118	135	152
1.75"	33	50	67	83	100	117	134	150
2.00"	33	50	66	83	99	116	132	149
2.25"	33	49	65	82	98	115	131	147
2.50"	32	49	65	81	97	113	130	146

JR700 Torque Conversion Chart

These torque conversion charts were calculated for the BT-ST-302D/BT-ST-302DR Digital Torque Tools.

For the JR700
Diameter of Part Being Tightened	Desired Torque Value (in-lbs) (“D”)
Diameter of Part Being Tightened	40	60	80	100	120	140	160	180	200
0.50"	25	38	51	64	76	89	102	115	127
0.75"	26	39	51	64	77	90	103	116	128
1.00"	26	39	52	65	78	91	104	117	129
1.50"	26	40	53	66	79	92	106	119	132
1.75"	27	40	53	67	80	93	107	120	133
2.00"	27	40	54	67	81	94	108	121	135
2.25"	27	41	54	68	82	95	109	122	136
2.50"	27	41	55	69	82	96	110	124	137
2.75"	28	42	55	69	83	97	111	125	139
3.00"	28	42	56	70	84	98	112	126	140
3.25"	28	42	57	71	85	99	113	127	141

How to Calculate Torque Values

When an adapter or extension is used on a torque wrench it increases the torque range of the wrench. The formula for computing torque when using an adapter or extension is explained below:

A = (Length) The Distance from the center of the torque wrench square drive to the center of the puller's hand grip.

B = The Distance from the center of the torque wrench square drive to the center of the drive at the end of the extension.

C = (Torque) The torque wrench setting.

D = The torque desired at the drive on the end of the extension.

P = Location of the pull force applied by the user.

Note: After computing "C" and setting the wrench to the calculated value, measure, and mark "A" where the pull force is to be applied by the user. It is recommended that the axis of the extension always be used in line with the axis of the torque wrench as shown in the image above.

Therefore: C = (D*A) / (A+E)

In some applications, obstructions may cause a need for an angle between the axes. In this case, the above formula is modified as follows. To minimize rounding errors, it is recommended to keep the angles as small as possible.

A, B, C, D, & P are the same as above.

E = Effective moment arm of the extension

Ø = The angle between the extension axis and torque wrench axis.

E = (B)(COSØ)

Therefore: C = (D*A) / (A+(B*COSØ))

When Ø = 0, COS Ø = 1, then the equation is reduced to C = (D*A) / (A+B)

When Ø = 90°, COS Ø = 0, then C = D (Regardless of the length B)

For recommended torque values for connector accessories see SAE AIR6151.