Torque Specification - Jacobsen Zero Turn Rotary Mower Safety, Operation & Maintenance Manual

10 ADJUSTMENTS

10.4 TORQUE SPECIFICATION __________________________________________________

The torque values included in these charts are approximate and are for reference only. Use these torque values at
your risk. Jacobsen is not responsible for any loss, claim or damage caused by these charts. Always use caution
with torque values.
Jacobsen uses Grade 5 (Inch) and Grade 8.8 (Metric) Plated bolts, unless a note is given. Always check the marks on
the head of the bolts for the bolt grade. For tightening plated bolts, use the value given for lubricated.
AMERICAN NATIONAL STANDARD FASTENERS
SIZE UNITS
GRADE 5
Lubricated
#6-32 in-lb (Nm) –
#8-32 in-lb (Nm) –
#10-24 in-lb (Nm) –
#10-32 in-lb (Nm) –
#12-24 in-lb (Nm) –
1/4-20 in-lb (Nm) 75 (8.4)
1/4-28 in-lb (Nm) 85 (9.6)
5/16-18 in-lb (Nm) 157 (17.7)
5/16-24 in-lb (Nm) 173 (19.5)
3/8-16 ft-lb (Nm) 23 (31.1)
3/8-24 ft-lb (Nm) 26 (35.2)
METRIC FASTENERS
SIZE UNITS
Lubricated
M4 Nm (in-lb) –
M5 Nm (in-lb) 1.80 (16)
M6 Nm (in-lb) 3.05 (27)
M8 Nm (in-lb) 7.41 (65)
M10 Nm (ft-lb) 14.7 (11)
M12 Nm (ft-lb) 25.6 (19)
M14 Nm (ft-lb) 40.8 (30)
en-51
GRADE 8
Dry Lubricated
20 (2.3) –
24 (2.7) –
35 (4.0) –
40 (4.5) –
50 (5.7) –
100 (11.3) 107 (12.1)
115 (13.0) 120 (13.5)
210 (23.7) 220 (24.8)
230 (26.0) 245 (27.6)
31 (42.0) 32 (43.3)
35 (47.4) 37 (50.1)
4.6 8.8
Dry Lubricated
– –
2.40 (21) 4.63 (41)
4.07 (36) 7.87 (69)
9.98 (88) 19.1 (69)
19.6 (14) 37.8 (29)
34.1 (25) 66.0 (48)
54.3 (40) 105 (77)
NOTICE
SIZE UNITS
Dry
– 7/16-14 ft-lb (Nm)
30 (3.4) 7/16-20 ft-lb (Nm)
45 (5.1) 1/2-13 ft-lb (Nm)
50 (5.7) 1/2-20 ft-lb (Nm)
65 (7.3) 9/16-12 ft-lb (Nm)
143 (16.1) 9/16-18 ft-lb (Nm)
163 (18.4) 5/8-11 ft-lb (Nm)
305 (34.4) 5/8-18 ft-lb (Nm)
325 (36.7) 3/4-10 ft-lb (Nm)
44 (59.6) 3/4-16 ft-lb (Nm)
50 (67.8) 7/8-14 ft-lb (Nm)
10.9
Dry Lubricated
– – –
6.18 (54) 6.63 (59) 8.84 (78)
10.5 (93) 11.3 (102) 15.0 (133)
25.5 (226) 27.3 (241) 36.5 (323)
50.5 (37) 54.1 (40) 72.2 (53)
88.0 (65) 94.5 (70) 125 (92)
140 (103) 150 (110) 200 (147)
GRADE 5 GRADE 8
Lubri- Dry
cated
37 (50.1) 50 (67.8) 53 (71.8)
42 (56.9) 55 (74.6) 59 (80.0)
57 (77.2) 75 (101) 80 (108)
64 (86.7) 85 (115) 90 (122)
82 (111) 109 (148) 115 (156)
92 (124) 122 (165) 129 (174)
113 (153) 151 (204) 159 (215)
128 (173) 170 (230) 180 (244)
200 (271) 266 (360) 282 (382)
223 (302) 298 404 315 (427)
355 (481) 473 (641) 500 (678)
12.9
Dry Lubricated Dry
3.83 (34) 5.11 (45)
7.75 (68) 10.3 (910
13.2 (117) 17.6 (156)
32.0 (283) 42.6 (377)
63.3 (46) 84.4 (62)
110 (81) 147 (108)
175 (129) 234 (172)
Lubri- Dry
cated
70 (94.9)
78 (105)
107 (145)
120 (162)
154 (209)
172 (233)
211 (286)
240 (325)
376 (509)
420 (569)
668 (905)
Non Critical
Fasteners into
Aluminum
2.0 (18)
4.0 (35)
6.8 (60)
17.0 (150)
33.9 (25)
61.0 (45)
94.9 (70)