Blizzard 680LT, Assembly & Operation Manual, Page: 35 / 40

1. Make sure the tubing and threads are clean.
2. Lubricate the threads with 10W hydraulic oil.
3. Hand tighten the nut/sleeve to appox. 30 in-lbs.
4. Make alignment marks on the nut and fitting.
5. Proceed to tighten to turns or ft-lb values.
6. When fully tightened make a 2nd set of align-
ment marks at the fully tightened position.
Note: Torque values specified are for threads
lubricated with 10W hydraulic oil.
Sizes -02 through -08 are less tolerant to over-
torque abuse. This will reduce the clamping force
resulting in loss of seal and reduction in flow.
37˚ JIC Flare Torque Values
Turns Size ft-lbs min./max. Assembly Steps w/Visual Check
N/A -02 6 - 7
N/A -03 8 - 9
2 -04 11 - 12
2 -05 14 - 15
1-1/2 -06 18 - 20
1-1/2 -08 36 - 39
1-1/2 -10 57 - 63
1-1/4 -12 79 - 88
1 -14 94 - 103
1 -16 108 - 113
1 -20 127 - 133
1 -24 158 - 167
1 -32 245 - 258
Metric Class 8.8 Metric Class 10.9
Tightening Torque Tightening Torque
“Lubricated” “Dry” “Lubricated” “Dry”
5 1,389 3.42 ft-lbs 4.56 ft-lbs 5 1,987 4.89 ft-lbs 6.52 ft-lbs
6 1,965 5.81 ft-lbs 7.80 ft-lbs 6 2,812 8.34 ft-lbs 11.07 ft-lbs
7 2,826 9.74 ft-lbs 12.99 ft-lbs 7 4,044 13.95 ft-lbs 18.60 ft-lbs
8 3,579 14.10 ft-lbs 18.82 ft-lbs 8 5,121 20.15 ft-lbs 26.94 ft-lbs
10 5,672 27.90 ft-lbs 37.27 ft-lbs 10 8,116 39.92 ft-lbs 53.28 ft-lbs
12 8,243 48.71 ft-lbs 64.94 ft-lbs 12 11,796 69.74 ft-lbs 92.25 ft-lbs
14 11,246 77.49 ft-lbs 103.32 ft-lbs 14 16,092 110.70 ft-lbs 147.60 ft-lbs
16 15,882 125.46 ft-lbs 166.79 ft-lbs 16 21,970 173.43 ft-lbs 231.00 ft-lbs
18 19,423 171.95 ft-lbs 229.52 ft-lbs 18 26,868 238.37 ft-lbs 317.34 ft-lbs
20 24,784 243.54 ft-lbs 325.46 ft-lbs 20 34,284 338.00 ft-lbs 450.18 ft-lbs
Torque Specifications 33
Torque Specifications
SAE J429 - Grade 5 SAE J429 - Grade 8
Tightening Torque Tightening Torque
“Lubricated” “Dry” “Lubricated” “Dry”
1/4-20 2,000 6.25 ft-lbs 8.34 ft-lbs 1/4-20 2,850 8.92 ft-lbs 11.93 ft-lbs
5/16-18 3,350 13.25 ft-lbs 17.5 ft-lbs 5/16-18 4,700 18.35 ft-lbs 25.44 ft-lbs
3/8-16 4,950 23 ft-lbs 31 ft-lbs 3/8-16 6,950 32.5 ft-lbs 44 ft-lbs
7/16-14 6,800 37 ft-lbs 50 ft-lbs 7/16-14 9,600 53 ft-lbs 70 ft-lbs
1/2-13 9,050 57 ft-lbs 75 ft-lbs 1/2-13 12,800 80 ft-lbs 107 ft-lbs
9/16-12 11,600 82 ft-lbs 109 ft-lbs 9/16-12 16,400 115 ft-lbs 154 ft-lbs
5/8-11 14,500 113 ft-lbs 151 ft-lbs 5/8-11 20,300 159 ft-lbs 211 ft-lbs
3/4-10 21,300 200 ft-lbs 266 ft-lbs 3/4-10 30,100 282 ft-lbs 376 ft-lbs
7/8-9 29,435 321 ft-lbs 430 ft-lbs 7/8-9 41,550 454 ft-lbs 606 ft-lbs
1-8 38,600 482.5 ft-lbs 640 ft-lbs 1-8 54,540 680 ft-lbs 900 ft-lbs
Clamp Loads
(Pounds)
Clamp Loads
(Pounds)
Nominal
Thread
Size
Nominal
Thread
Size
Grade Identification Marking for J429 - Grade 5 Bolt
• Material: Medium carbon steel: quenched and tempered
• Minimum Proof Strength: 85,000 psi
• Minimum Tensile Strength: 120,000 psi
• Core Hardness Rockwell (min.): C25, (max.): C34
• Minimum Yield Strength: 92,000 psi Grade Identification Marking for J429 - Grade 8 Bolt
• Material: Medium carbon alloy steel:quenched and tempered
• Minimum Proof Strength: 120,000 psi
• Minimum Tensile Strength: 150,000 psi
• Core Hardness Rockwell (min.): C33, (max.): C39
• Minimum Yield Strength: 130,000 psi
8.8
Clamp Loads
(Pounds)
Clamp Loads
(Pounds)
Diameter
(millimeters)
Diameter
(millimeters)
Grade Identification Marking for Metric - Grade 8.8 Bolt
• Material: Medium carbon steel: quenched and tempered
• Minimum Proof Strength: 580 MPa
• Minimum Tensile Strength: 800 MPa
• Core Hardness Rockwell (min.): C22, (max.): C32
• Minimum Yield Strength: 640 MPa
10.9
Grade Identification Marking for Metric - Grade 10.9 Bolt
• Material: Low carbon alloy steel: quenched and tempered
• Minimum Proof Strength: 830 MPa
• Minimum Tensile Strength: 1040 MPa
• Core Hardness Rockwell (min.): C32, (max.): C39
• Minimum Yield Strength: 940 MPa
O-Ring Boss Torque Values
Size ft-lbs min./max. O-Ring Boss Assembly
-02 6 - 7
-03 8 - 10
-04 13 - 15
-05 17 - 21
-06 22 - 25
-08 40 - 43
-10 43 - 57
-12 68 - 75
-14 90 - 99
-16 112 - 123
-20 146 - 200
-24 154 - 215
-32 218 - 290
1. Verify the port, O-ring, sealing surfaces, and threads are
clean and free of damage.
2. Lubricate the threads and the O-ring with 10W hydraulic oil.
3. For an adjustable O.R.B., completely back-off the lock nut
and the washer.
4. Hand tighten the fitting until it contacts the port spotface.
Point the elbow or tee in the desired direction and hold.
5. Proceed to tighten to the proper specified torque value.
Note: Torque values specified are for threads lubricated
with 10W hydraulic oil.
Disclaimer: All torque values included in the charts above are advisory only, and their use by anyone is entirely voluntary. Reliance on the contents for any purpose by anyone is the sole risk of that person and Blizzard Corporation is not responsible for any loss, claim or damages
arising therefrom. Blizzard Corporation has made an effort to present the above contents accurately, but we do not guarantee its completeness or validity. This information is subject to change at any time, without notice. Blizzard Corporation makes no representations or warranties,
express or implied, in connection with the information.