MA2170 HAS BEEN REAFFIRMED TO COMPLY WITH THE SAE FIVE-YEAR REVIEW POLICY.
Length "L" is a four digit number of which the first three digits describe the hose assembly length in whole centimeters (cm), and the fourth digit, the fraction of a cm in millimeters (mm). Length "L" is measured from "face of seat" to "face of seat". For length increments and tolerances see Table 3.
A true circular cross section is not required through the fitting I.D. However, the applicable ball diameter listed in Table 1 shall pass through the end fitting after it is attached to the hose assembly.
Distance across corners of the coupling nut may exceed this dimension.
Standard coupling nuts shall be in accordance with MA2275 or MA2276 and mate with MA2273 fitting ends. Nonstandard coupling nuts may be used provided they are dimensionally and functionally equivalent and provided they cannot be removed from the fitting. Nonstandard nuts shall meet torque test requirements per MA2007.
Diameters are listed for clamp selection. Tubular sleeves may not be a perfect round and shall be measured with a diameter tape rule (often referred to as a pi-tape).
Tubular abrasion (TFE) sleeves shall have an I.D. no greater than hose O.D. + 1.27 mm. Axial movement of the sleeve installed on the hose shall not exceed 1.27 mm. Ends of the tubular sleeve shall be terminated with a length of MIL-I-23053/11 (FEP) class 1 or 2, color clear, per Table 5 and Figure 2.
Coil abrasion sleeves, when assembled on a straight hose, shall have an average gap between coils not exceeding 1.27 mm. Displacement of the coils of the sleeve, causing a greater gap, shall not be cause for rejection if the coils can be repositioned to meet the gap requirements. Ends of the coil sleeve shall be terminated with a length of heat shrinkable sleeving in accordance with Table 5 and Figure 2. Code "B" (nylon coil) abrasion sleeves shall be terminated with MIL-I-23053/5 class 1 or 3, color black. Code "L" (coil abrasion) sleeves shall be terminated with MIL-I-23053/12A, class 1, color transparent, PTFE. (Optional MIL-I-23053/11 (FEP) class 1 or 2, color clear.)
The Table 2 sleeve diameters for AS1072 sleeves apply when the sleeve is compressed, or clamped, to contact the hose. In this case, a wrinkle may occur over approximately 10% of the sleeve circumference.
The cut ends of the firesleeve shall be coated with RTV silicone rubber, prior to installation, to prevent wicking of the fluids. The firesleeve ends shall be secured to the hose assembly end fittings with corrosion resistant steel bands. After installation, cracks or voids in the firesleeve that expose the fiberglass shall be coated with RTV silicone rubber.
Integral abrasion sleeve shall form an integral, permanent part of the hose and shall terminate a maximum of 3.0 mm from the end of the collars.
FEP and polyolefin shrink abrasion sleeves shall be shrunk to a snug fit over the hose and end fitting collars.
50.0 ± 6
63.5 ± 6
76.0 ± 6
DN 25TABLE 5
Add "AS1055 type IIb class B-S/P" to identification marking to show level of confidence, "fire proof" (15 min), with AS1055.
The ends of the integral firesleeve shall be covered with a length of silicone sleeve extending over the end fitting socket.