NOTE: Table 503 identifies Honeywell approved anti-seize lubricants for threaded fasteners and fittings, depending on the service temperature and the fluid contacted. Only anti-seize lubricants shown in Table 503 shall be used unless otherwise approved by Honeywell.
(4)
Tighten fasteners installed through inelastic boundaries as follows:
(a)
Tighten each fastener until there is no visible clearance between parts.
NOTE: During the initial tightening run-down resistance shall be noted on the last rotation before establishing tensile preload in the fastener.
(b)
Apply additional tightening evenly to produce the final torque value specified in Table 504 and Table 505.
NOTE: This procedure will produce ±35 percent accuracy, which is adequate for fasteners.
(c)
Apply addition tightening to each fastener equal to the “Rotation after Run-down” value specified in Table 506.
(5)
Tighten nuts and bolts installed through faying surface joints or sealed with a diaphragm, O-ring, or similar elastimeric gasket as follows:
(a) Torque nuts and bolts to equal values to obtain pressure-tight seal.
(6)
Tighten nuts and bolts installed through flanges with gasket material as follows:
(a)
Apply initial torque at 60 percent of the final torque value specified, or listed in Table 505.
(b)
Apply torque at 100 percent of final torque value.
Assembly
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(7) Retighten tubing connections as follows:
NOTE: All tubing connections shall be torqued during the assembly and prior to functional testing of a unit.
If for any reason, personnel loosen or disconnect tubing, the connection shall be retorqued to the required value with a calibrated torque wrench.
(a)
Using a calibrated torque wrench, tighten connections to conform to the specified torque values.
(b)
Using an open-end wrench, tighten all remaining fittings.
Table 504. Appropriate Rotation for Final Torque
Thread Size Approximate Rotation After Run-Down
6 -32 45°
8 -32 60°
10 -24 40°
1/4 -20 40°
5/16 -18 40°
Assembly
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Table 505. Bolts and Nuts with Metal-to-Metal Faying Surfaces
METAL-TO-METAL FAYING SURFACES -NUTS AND BOLTS
MAXIMUM TORQUE INCH-POUNDS AND NEWTON-METER BY BOLT MATERIAL
THREAD SIZE ALUMINUM 2024-T6 STEEL BOLT CAD. PLATED 18-8 STAINLESS STEEL
BOLT SIZE THREAD / INCH NUT TORQUE BOLT TORQUE NUT TORQUE BOLT TORQUE NUT TORQUE BOLT TORQUE
In-Lbs N-m In-Lbs N-m In-Lbs N-m In-Lbs N-m In-Lbs N-m In-Lbs N-m
2 ----56 1.1 0.1242833 1.4 0.1581787 1.7 0.1920742 2.2 0.2485666 2.0 0.2259696 2.5 0.2824620
2 ----64 1.4 0.1581787 1.7 0.1920742 2.2 0.2485666 2.7 0.3050590 2.4 0.2711635 3.0 0.3389544
3 ----48 1.7 0.1920742 2.1 0.2372681 2.8 0.3163574 3.5 0.3954468 3.1 0.3502529 3.9 0.4406407
3 ----56 1.9 0.2146711 2.4 0.2711635 3.2 0.3615514 4.0 0.4519392 3.5 0.3954468 4.4 0.4971331
4 ----40 2.4 0.2711635 2.9 0.3276559 3.8 0.4293422 4.7 0.5310286 4.3 0.4858346 5.2 0.5875210
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