Steel SAE O-Ring Adapters
Conformance
- SAE J514
- SAE J1926/1, SAE J1926/3
- ISO 11926-1, ISO 11926-3
Materials
- Steel - Carbon steel zinc plated with yellow Dichromate per ASTM B33-98 (Type II SC-2)
- Stainless - Type 316 (Use SS prefix when ordering).
Working Pressures
The following table lists the recommended working pressures for steel O-ring Straight Thread fittings
made in accordance with SAE standard J514. Many factors such as surging, vibration, mechanical shock and
over tightening may affect the integrity of fitting connections. Tompkins and SAE recommend sufficient
testing be conducted to assure that performance levels will be safe and satisfactory, especially if
installed in systems operating at elevated pressures or in severe conditions. When using fittings with
different size or thread type, use the lower pressure rating of the two threads.
CAUTION: Although most O-ring Straight Thread Fittings have sufficient structural integrity to support
the weight of many components, Tompkins recommends consulting with our technical support department for
guidance in selection of parts for this purpose.
SAE J514 O-Ring Straight Thread Fittings Pressure Ratings For Straight And Adjustable Thread Port Studs
| Dash Size |
Straight Thread Size(Inches) |
4 To 1 Minimum Burst PSI Straight Boss O-Ring Studs |
4 To 1 Minimum Burst PSI Adjustable Boss O-Ring Studs |
| -2 |
5/16-24 |
5000 |
5000 |
| -3 |
3/8-24 |
5000 |
5000 |
| -4 |
7/16-20 |
5000 |
4500 |
| -5 |
1/2-20 |
5000 |
4000 |
| -6 |
9/16-16 |
5000 |
4000 |
| -8 |
3/4-16 |
4500 |
4000 |
| -10 |
7/8-14 |
3500 |
3000 |
| -12 |
1 1/16-12 |
3500 |
3000 |
| -14 |
1 3/16-12 |
3000 |
2500 |
| -16 |
1 5/16-12 |
3000 |
2500 |
| -20 |
1 5/8-12 |
2500 |
2000 |
| -24 |
1 7/8-12 |
2000 |
1500 |
| -32 |
2 1/2-12 |
1500 |
1125 |
Torque Values
The minimum torque values provided by Tompkins Industries are to provide benchmarks that give optimum results for leak free connections. Actual torque values should be based on individual applications.
Recommended Straight Thread O-Ring Non-Adjustable Stud Assembly Instructions
- Step 1. Inspect all components for damage or contamination.
- Step 2. Lubricate O-ring and threads on fitting.
- Step 3. Turn fitting into port until finger-tight, then torque to the value shown in the tables below.
Recommended Straight Thread O-Ring Adjustable Stud Assembly Instructions
- Step 1. Follow steps 1 and 2 from the foregoing instructions, then proceed to the following steps below.
- Step 2. Looking at fitting from end with nut/washer/o-ring assembly, turn nut clockwise as far as possible.
- Step 3. Using wrench, turn fitting into port until the washer touches the port spot face. Continue
turning fitting until washer touches thread nearest wrench pad.
- Step 4. Back off fitting counterclockwise not exceeding one revolution until it is oriented in the
correct position.
- Step 5. Place wrench on the wrench pad of fitting to prevent fitting from turning, and torque nut to
the value shown in the following table.
J514 & J1926/3 Torque Values
| Dash Size |
Straight Thread Size(Inches) |
Straight Stud Torque Foot/Lbs |
Adjustable Stud Torque Foot/Lbs |
| -2 |
5/16-24 |
6-7 |
6-8 |
| -3 |
3/8-24 |
6-9 |
6-8 |
| -4 |
7/16-20 |
9-15 |
8-10 |
| -5 |
1/2-20 |
14-19 |
9-12 |
| -6 |
9/16-18 |
18-24 |
12-16 |
| -8 |
3/4-16 |
27-43 |
20-30 |
| -10 |
7/8-14 |
36-48 |
30-36 |
| -12 |
1 1/16-12 |
65-75 |
44-54 |
| -14 |
1 3/16-12 |
75-99 |
53-70 |
| -16 |
1 5/16-12 |
85-123 |
59-80 |
| -20 |
1 5/8-12 |
115-161 |
75-100 |
| -24 |
1 7/8-12 |
125-170 |
105-125 |
| -32 |
2 1/2-12 |
180-240 |
140-180 |
J1453 & J1926/2 Torque Values
| Dash Size |
Straight Thread Size(Inches) |
Straight Stud Torque Foot/Lbs |
Adjustable Stud Torque Foot/Lbs |
| -2 |
5/16-24 |
NA |
NA |
| -3 |
3/8-24 |
8-10 |
NA |
| -4 |
7/16-20 |
14-16 |
11-13 |
| -5 |
1/2-20 |
18-20 |
14-16 |
| -6 |
9/16-18 |
24-26 |
18-21 |
| -8 |
3/4-16 |
40-60 |
28-38 |
| -10 |
7/8-14 |
55-80 |
44-60 |
| -12 |
1 1/16-12 |
95-135 |
65-95 |
| -14 |
1 3/16-12 |
105-190 |
75-125 |
| -16 |
1 5/16-12 |
120-220 |
85-150 |
| -20 |
1 5/8-12 |
160-280 |
115-170 |
| -24 |
1 7/8-12 |
175-360 |
125-225 |
Why Wet Torque?
Due to differences in plating types and thicknesses, materials and
thread quality of components, the coefficient of friction
can vary widely on any given assembly. Lubrication not only
produces a more consistent coefficient of friction, it increases
clamping force on sealing area with less torque on the threads.
Over-tightening causes threads to yield, deform and therefore lose the
ability to maintain an adequate load or clamping force on the
seating area. Extended operation and severe conditions cause
further yielding which promotes possibility of leaks. Improper
installation is the primary cause of leaks in hydraulic
connections.
Tompkins firmly recommends the application of the wet-torque method during installation. When you choose not to wet-torque, consistency and quality are compromised for the sake of convenience.
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