MacDon M155 2022 - Metric Bolt Specifications Bolting into Cast Aluminum; Flare-Type Hydraulic Fittings

215676 469 Revision A
Metric Bolt Specifications Bolting into Cast Aluminum
The torque values provided in the following metric bolt torque tables apply to hardware installed dry; that is, hardware
with no grease, oil, or threadlocker on the threads or heads. Do NOT grease or oil bolts or cap screws unless directed to do
so in this manual.
10013701001370
A
Figure 8.9: Bolt Grades
Table 8.9 Metric Bolt Bolting into Cast Aluminum
Nominal
Size (A)
Bolt Torque
8.8
(Cast Aluminum)
10.9
(Cast Aluminum)
Nm
lbf·ft
Nm
lbf·ft
M3
–– –
1
M4
––
4
2.6
M5
––
8
5.5
M6 9 6 12 9
M8 20
14
28 20
M10 40 28
55
40
M12 70 52 100 73
M14
–– – –
M16
–– – –
Flare-Type Hydraulic Fittings
1003430
A
C
D
B
E
Figure 8.10: Hydraulic Fitting
1. Check flare (A) and flare seat (B) for defects that might
cause leakage.
2. Align tube (C) with fitting (D) and thread nut (E) onto the
fitting without lubrication until contact is made between
the flared surfaces.
3. Torque fitting nut (E) to the specified number of flats from
finger tight (FFFT) or to a given torque value in Table 8.10,
page 469.
4. Use two wrenches to prevent fitting (D) from rotating. Place
one wrench on fitting body (D), and tighten nut (E) with the
other wrench to the torque value shown.
5. Assess the final condition of connection.
Table 8.10 Flare-Type Hydraulic Tube Fittings
SAE Dash Size
Thread Size (in.)
Torque Value
50
Flats from Finger Tight (FFFT)
Nm
lbf·ft
Tube
Swivel Nut or
Hose
-2
5/16–24
4–53–4
——
-3
3/8–24
7–8
5–6
——
-4
7/16–20
18–19 13– 14
2 1/2
2
-5
1/2–20
19–21 14– 15
22
-6
9/16–18
30–33
22–24 2
1 1/2
-8
3/4–16
57–63 42– 46 2
1 1/2
REFERENCE
50. Torque values shown are based on lubricated connections as in reassembly.