MASSEY FERGUSON MF 300 Series Workshop Service Manual page 30

Miscellaneous Data
BOLT TORQUE SPECIFICATIONS (GENERAL GUIDE FOR INCH FASTENERS)
Use the "Standard Torque" charts as a general guide when tightening fasteners that DO NOT HAVE SPECIFIC
TIGHTENING RECOMMENDATIONS.
* Inch bolt SAE grade 5
**mild steel
size
below grade 5
1/4 inch 6-8
(4-6)
5/16 inch 12-16
(9 - 12)
3/8 inch
22-30
(16-22)
7/16 inch 35-47
(26 - 35)
1/2 inch 54-72
(40-53)
5/8 inch 110-140
(81-103)
3/4 inch 190-250
(140-184)
7/8 inch
310-410
(228-302)
1 inch 460-620
(339-457)
Key to table above:
NOTE:
** NOTE: Mild steel torque values to be used for SAE Grade 5 bolts when weld nuts, or other low
strength nuts are used.
•••
NOTE: Use these values when any of the following conditions exist:
1. Possible damage to the joined members of the assembly may occur.
2. T hick and/or highly compressible gaskets are used between members.
3. Non-flat unmachined seating surfaces for bolt head (or nut) occurs.
4. Non-flat or non-parallel joint faces are encountered.
****
NOTE:
Use these values when ALL of the following conditions exist:
1. Damage will not occur to the joined members of the assembly.
2. It is desirable to use this higher clamping force to ensure tightness.
3. Fastener thread is not lubricated prior to assembly.
1C-2
Inch Fasteners
Standard torque in Newton Metres (Foot Pounds)
SAE grade 8
ISO grade 8.8
BS grade S
*** Non-rigid joint
9-12
(7-9)
18-24
(13 - 18)
31-42
(23-31)
51-69
(38-51)
80-104
(59-77)
160-210
(118-155)
280-370
(207-273)
450-610
(332-450)
670-900
(494-664)
The size is the diameter of the shank - not the head width.
**** Rigid joint *** Non-rigid joint
11-15 13-18
(8-11) (10 - 13)
22-30 25-34
(16-22) (18 - 25)
39-53
44-60
(29-39) (32-44)
64-86 72-96
(53-71)
(47-63)
100-130 110-140
(74-96)
(81-103)
200-260 220-300
(148-192) (162-221)
350-460 390-530
(258-339) (287-391)
560-760 640-850
(413-561) (472-672)
840-1120 960-1280
(620-826) (708-944)
ISO grade 10.9
BS grade V
**** Rigid joint
16-22
(12-16)
31-43
(23 - 32)
55-75
(41-55)
90-120
(66-89)
140-180
(103-133)
280-370
(207-273)
490-660
(361-487)
800-1060
(590-782)
1200-1600
(885-1180)
MF 300 series
ACT0027090