FOR MODELS: JGW, JGR AND JGJ SECTION 1 - DESIGN SPECIFICATIONS & DATA
1/01 PAGE 1 - 15
Fastener Tightening Torque
Listed in the following tables are fastener tightening torque values required for proper
assembly of Ariel JGW, JGR and JGJ compressors. Refer to the section concerning a sub-
ject component for detailed assembly procedures.
Threads must be clean and free of burrs.
Torque values are based on the use of petroleum type lubricants on both the threads and
seating surfaces. Use lubricating oil or Lubriplate 630, except for compressor rods-piston
end, piston nuts and crosshead nuts use Never-Seez (by Bostik, Boston St., Middleton, MA
01949, phone: 508-777-0100). Molybdenum disulfide lubricants and Never-Seez are not
otherwise to be used for fastener lubrication, unless specified, or excessive stresses can
result with the listed values.
For latest available torque values, see ER-63 at www.arielcorp.com.
TABLE 1-11: FASTENER TIGHTENING VALUES
FASTENER
NOMINAL SIZE,
INCH - TPI
TYPE
TORQUE,
LB X FT (N·m)
Main Bearing Cap - Cap Screw 5/8 - 11 12 Point - Grade 8 97 (132)
Connecting Rod Cap/Detuner Donut - Cap Screw 5/8 - 18 12 Point - Grade 8 123 (167)
Connecting Rod Cap/Detuner Donut - Cap Screw 3/4 - 16 12 Point - Grade 8 216 (293)
Crosshead Pin Thru Bolt - Lock Nut 7/16 - 20 Hex - Prevailing 39 (53)
Spacer Bar - Cap Screw 3/4 - 16 12 Point - Grade 8 160 (217)
Crosshead Guide to Frame - Cap Screw 5/8 - 11 12 Point - Grade 8 97 (132)
Crosshead Guide to Cylinder - Cap Screw 5/8 - 11 12 Point - Grade 8 97 (132)
Crosshead Guide to Cylinder -Stud Nut 1/2 - 13 Hex 48 (65)
Crosshead Guide to Cylinder -Stud Nut 9/16 - 12 Hex 70 (95)
Crosshead Guide to Cylinder -Stud Nut 5/8 - 11 Hex 97 (132)
Crosshead Guide Support - Cap Screw 3/4 - 10 Hex - Grade 8 or 9 160 (215)
Crosshead Guide Support - Cap Screw 5/8 - 11 Hex - Grade 8 or 9 90 (120)
Eccentric Vernier Cap - Cap Screw 5/16 - 18 Hex - Grade 8 Hand Wrench
Tight
Idler Sprocket Thru Bolt - Lock Nut 1/2 - 20 Hex - Prevailing 41 (55)
Rod Packing - Cap Screw 5/8 - 11 12 Point - Grade 8 70 (95)
Piston Nut 1-1/4 - 12 Ariel Design 695 (940)
Crosshead Nut 1-3/8 - 12 Ariel Design 650 (885)
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