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b.The material and dimensional requirements established by this specification are bad upon the
following:
1.Static and dynamic applications.
2.Compounds of nominal 70 durometer hardness.
3.Fluid pressures of 1500 psi max (incread compound hardness, back-up rings, or reduced
clearances, or both, promote aling to much greater pressures).
4.Rotary al applications are sometimes possible, but special design considerations are necessary
and special compound recommendations can be obtained from al suppliers.
3.2Material Classifications—Two class of material are covered by this specification. O-rings shall be
classified in accordance with their intended u as follows:注册国际人力资源师
a.Class I—Oil resistant rvice
b.Class II—Gasoline resistant rvice
Applications requiring resistance to special fluids can usually be satisfied by numerous compounds available.
Suppliers should be contacted for their recommendations whenever possible. (See tables for compound designations in SAE J200.)
3.3Basis of Purcha—Material and sizes required are specified by listing the SAE specification number, rvice
classification, size number, and identification, when desired.
EXAMPLE—SAE 120R1
< ll
Size (128)
3.4Physical Requirements
a.Quality control and source approval tests shall be conducted on the actual al ring when the ction
diameter is 0.100 in or larger, and the inside diameter is 1 in or larger. Smaller ction parts do not
我很好英语provide reliable data. If, by necessity, smaller sizes are tested, then special specification limits and test
procedures shall be bad on actual part performance as agreed between the purchar and the
supplier.
b.Test specimens shall conform to the requirements specified in Table 1.
3.5Dimensions and Tolerances—O-rings shall conform to the dimensions and tolerances prescribed in Table 2.
haunt
For dimensional standardization purpos, O-rings shall be numbered as shown in T able 3.
FIGURE 1—O-RING DESIGN EXAMPLES
TABLE 1—PHYSICAL REQUIREMENTS
Class I Oil Service ASTM Specimen
Class I
Oil Service
Actual
Part
Class II
Fuel Service
ASTM
Specimen
Class II
Fuel Service
Actual
Part
(a) Original Physical Properties
Hardness points70 ± 5—70 ± 5—
Tensile strength, min, psi1500120015001200
Ultimate elongation, min, %200150200150
oppo音乐手机广告曲Ultimate elongation, max, %400400400400
Modulus at 100 elongation, min, psi450400450400fort mcmurray
drenched>grouppolicy(b) Heat Aging, 70 h at __ °F257257212212
Hardness, points change+10—+10—
Tensile strength, max, % change-15-15-15-15
Elongation, max, % change-50-50-50-50
(c) Compression Set, 70 h at __ °F257257212212
ASTM specimen, max, %35—25—
0.200 to 0.300 in, max, %—45—35
0.100 to 0.200 in, max, %—65—55
(d) Fluid Aging, 70 h at __ °F302302Room Temp Room Temp
Type of ASTM Fluid No. 1 Oil No. 1 Oil Fuel A Fuel A
Hardness, points change-5 to +8—0 to -8—
comres
Tensile strength, max, % change-15-15-15-15
Elongation, max, % change-40-40-25-25
Volume change, max, %±5±5±3±3
Dry-out volume change, max, %
(4 h at 158 °F)——-6-6
(e) Fluid Aging, 70 h at __ °F302302Room Temp Room Temp
Type of ASTM Fluid No. 3 Oil No. 3 Oil Fuel B Fuel B
Hardness, points change0 to -15—-20—
Tensile strength, max, % change-30-30-50-50
Elongation, max, % change-40-40-50-50
Volume change, max, %+20+20+25+25
Dry-out volume change, max, %
(4 h at 158 °F)——-10-10
(f) Fluid Aging, 70 h at __ °F Room Temp Room Temp
Type of ASTM Fluid Fuel C Fuel C
Volume change, max, %+35+35
(g) Low T emperature Aging
Brittleness at -20 °F No cracks—No cracks—
Figure 8 bend, 5 h at -40 °F—No cracks—No cracks NOTE—The limits in this table for actual parts are for parts 0.100 in cross ction and larger. If smaller cross ction parts are tested, special limits shall be agreed upon between the purchar and the supplier.
TABLE 2—DIMENSIONS AND TOLERANCES, IN
Size No.Actual Size
ID Actual Size
OD (Ref)
Dynamic Seals A Cylinder Bore Dia Dynamic Seals B Piston Groove Dia Dynamic Seals C Rod Dia Dynamic Seals D Rod Gland Groove Dia Toler-ance ±0.005—+0.002−0.000+0.000−0.002+0.000−0.002+0.002−0.0000060.1140.2540.2500.1400.1250.2350070.1450.2850.2810.1710.1560.2660080.1760.3160.3120.2020.1880.2980090.2080.3480.3430.2330.2190.3290100.2390.3790.3750.2650.2500.3600110.3010.4410.4370.3270.3120.4220120.3640.5040.5000.3900.3750.485W—Actual al width 0130.4260.5660.5630.4530.4370.547 0.070 in ± 0.003 in 0140.4890.6290.6250.5150.5000.610E—Groove width, in:0150.5510.6910.6880.5780.5620.672 Dynamic—0160.6140.7540.7500.6400.6250.735 0.055-0.0570170.6760.8160.8120.7020.6880.798Static:0180.7390.8790.8750.7650.7500.860 Radial—Toler-ance ±0.006—+0.002−0.000+0.000−0.002+0.000−0.002+0.002−0.000 0.049-0.055 Axial—0190.8010.9410.9370.8270.8120.922 0.045-0.0500200.864 1.004 1.0000.8900.8750.985F—Groove length, in—0210.926 1.066 1.0620.9520.937 1.047 0.090-0.1000220.989 1.129 1.125 1.015 1.000 1.110R—Radius, in—023 1.051 1.191 1.188 1.078 1.062 1.172 0.005-0.015
伤害的英文024 1.114 1.254 1.250 1.140 1.125 1.235Cross-ctional squeeze, in, min:025 1.176 1.316 1.312 1.202 1.188 1.298 Dynamic—0.010026 1.239 1.379 1.375 1.265 1.250 1.360 Static:
027 1.301 1.441 1.437 1.327 1.312 1.422 Radial—0.012028
1.364
1.504
1.500
1.390
1.375
1.485
Axial—0.017
Toler-ance ±0.010—+0.002−0.000+0.000−0.002+0.000−0.002+0.002−0.000 Piston groove diameter shall be concentric with piston OD within 0.002 total indicator reading and rod gland groove diameter shall be concentric with rod bore diameter within 0.002 total indicator reading.029 1.489 1.629 1.625 1.515 1.500 1.610 030 1.614 1.754 1.750 1.640 1.625 1.735
031 1.739 1.879 1.875 1.765 1.750 1.860 Note—Sizes 013 to 045 are not generally ud for dynamic als and are not ordinarily
recommended for such rvice. In special cas where space or other factors dictate the
desirability of small cross-ctions, the sizes should be incorporated into a design only
after a careful engineering analysis and thorough testing.
032 1.864 2.004 2.000 1.890 1.875 1.985033 1.989 2.129 2.125 2.015 2.000 2.110034 2.114 2.254 2.250 2.140 2.125 2.235035 2.239 2.379 2.375 2.265 2.250 2.360036 2.364 2.504 2.500 2.390 2.375 2.485037 2.489 2.629 2.625 2.515 2.500 2.610038 2.614 2.754 2.750 2.640 2.625 2.735Toler-ance
+0.002+0.000+0.000+0.002±0.015
—
−0.000
−0.002
−0.002
千万别学英语
−0.002
