1、 MIL-PRF-64266/21 6 November 2013 PERFORMANCE SPECIFICATION SHEET CONNECTORS, FIBER OPTIC, CIRCULAR, PLUG AND RECEPTACLE STYLE, MULTIPLE REMOVABLE TERMINI, SCREW THREADS, BACKSHELL, SPLIT, SINGLE FIBER CABLES, NO CABLE ENTRY END INTERFACE, ENVIRONMENT RESISTING This specification is approved for use
2、 by all Departments and Agencies of the Department of Defense. The requirements for acquiring fiber optic connectors described herein shall consist of this specification sheet and MIL-PRF-64266. SCOPE. The performance requirements specified herein cover a backshell intended for use with a MIL-PRF-64
3、266 or MIL-DTL-38999 connector plug or receptacle in a fiber optic only application. This backshell is intended for an open cable harness configuration in which a bundle of single fiber cables (simplex optical cables) are routed to the connector plug or receptacle with no external protection. This b
4、ackshell is used for interface with the connector plug or receptacle on one end and contains no interface on the other end. Environmental resistant features include ability to restrict movement, position, and twist of each cable in addition to eliminate or reduce penetration of various environments.
5、 This backshell is one of a split (clam shell) shell configuration consisting of a front adapter, rear adapter, and two (split) shell halves. Split shell halves offer a means of easy access for inspection, troubleshooting and repair. Straight Backshell FIGURE 1. Straight, 45 and 90 degree backshell
6、orientations. AMSC N/A FSC 6060 INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-64266/21 2 45 backshell 90 backshell FIGURE 1. Straight, 45 and 90 degree backshell orientations - Continued. Provided by IHSNot for ResaleNo reproduct
7、ion or networking permitted without license from IHS-,-,-MIL-PRF-64266/21 3 FIGURE 1. Straight, 45 and 90 degree backshell orientations - Continued. Shell A thread Dia B max C max Dia D max Dia E max size ISO metric inches mm inches mm inches mm inches mm 11 M15x1.0-6H 0.960 24.38 4.0 101.6 0.50 12.
8、7 0.960 24.38 13 M18x1.0-6H 1.085 27.56 4.0 101.6 0.50 12.7 1.085 27.56 15 M22x1.0-6H 1.255 31.88 4.7 119.4 0.75 19.5 1.255 31.88 17 M25x1.0-6H 19 M28x1.0-6H 21 M31x1.0-6H 23 M34x1.0-6H 1.695 43.05 4.7 119.4 1.25 31.8 1.750 44.50 25 M37x1.0-6H Shell F max G max H max J max C max size inches mm inche
9、s mm inches mm inches mm inches mm 11 2.5 63.5 3.2 81.3 4.3 109.2 3.3 83.8 3.5 88.9 13 2.5 63.5 3.3 83.8 4.4 111.8 3.4 86.4 3.5 88.9 15 2.7 68.6 3.4 86.4 4.7 119.4 3.6 91.4 4.2 106.7 17 19 21 23 3.2 81.3 4.7 119.4 5.5 139.7 4.8 121.9 4.2 106.7 25 Notes. 1. Dimensions are in inches. 2. Metric equival
10、ents are given for general information only. 3. Dimensions apply to plated/finished part. 4. Metric equivalents are in millimeters (mm). 5. Backshell internal configuration not shown. The backshell interface dimensions shall be in accordance with figure A-6 of MIL-PRF-64266. 6. See table V herein fo
11、r relationship of cable entry code to shell size. 7. Screws used shall be captive and fastened using a 3/32 inch hex wrench for shell sizes 11, 13, and 15 and a 7/64 inch hex wrench for shell size 23. 8. Rear adapter and front adapter for backshells with the 45 degree and the 90 degree cable entry a
12、ngles shall be the same as that for the backshells with a straight cable entry angle. 9. Wrench flats. Wrench flats shall be placed on the front adapter coupling ring. The distance between wrench flats shall be 7/8, 15/16, 1-1/8, and 1-5/8 inch for shell sizes 11, 13, 15 and 23, respectively. 10. St
13、rip length. Strip length shall be standardized as specified in fabrication procedure in accordance with NAVAIR 01-1A-505-4/T.O. 1-1A-14-4/TM 1-1500-323-24-4. The strip length shall be the same length for backshells with a straight, 45 degree and 90 degree cable entry angles. 11. Distance from front
14、of coupling ring to connector mating surface. This dimension provided for reference only to determine horizontal dimension for a mated connector with backshell. 12. Envelop length dimensions are specified to one decimal place to expedite inspection process unless otherwise indicated. 13. Dimension K
15、 is the minimum inside diameter for cable entry. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-64266/21 4 REQUIREMENTS. Dimensions and configurations. See figure 1 herein and MIL-PRF-64266, figure A-6. Temperature ranges. Operating.-67F to
16、329F (-55C to 165C) Non-operating.-40F to 185F (-40C to 85C) Storage.-40F to 185F (-40C to 85C) Weight. Weight shall not exceed the specified value in table I for the applicable shell size, cable entry angle and material. TABLE I. Backshell weights. Shell Cable entry Composite Aluminum Stainless ste
17、el size(s) angle ounce gram ounce gram ounce gram 11 straight 1.13 32 1.94 55 5.42 154 45o,90o1.30 37 2.39 68 7.18 204 13 straight 1.30 37 2.25 64 6.41 182 45o,90o1.44 41 2.57 73 7.36 209 15 straight 1.44 41 2.57 73 7.36 209 45o,90o1.62 46 2.89 82 8.17 232 17 straight 1.76 50 3.03 86 8.80 250 45o,90
18、o1.94 55 3.70 105 10.07 286 19 straight 1.94 55 3.20 91 9.57 272 45o,90o2.08 59 3.70 105 10.70 304 21 straight 2.39 68 4.15 118 11.97 340 45o,90o2.71 77 4.96 141 14.22 404 23 straight 2.39 68 4.47 127 12.46 354 45o,90o2.89 82 5.10 145 13.41 381 25 straight 2.71 77 4.96 141 14.22 404 45o,90o3.20 91 5
19、.60 159 16.30 463 Fabrication procedure. Standard fabrication procedure (for both the terminus placement/termination onto the end of fiber optic cabling and the assembly of the connector and backshell onto the fiber optic cabling) shall be used. Standard fabrication procedure shall be in accordance
20、with NAVAIR 01-1A-505-4/T.O. 1-1A-14-4/TM 1-1500-323-24-4. A copy of this document may be obtained at web site. https./jswag.navair.navy.mil. Backshell capture mechanism at the cable entry end. None. Backshell must be provided with a provision to ensure that the cable restraint mechanism is retained
21、 within the backshell by the rear adapter. Cable restraint mechanism. Backshell shall contain means to provide environmentally resisting support for the single fiber cables exiting the termini. Support shall restrict movement during vibration and shock (act as a vibration dampener), restrict positio
22、n of each cable (act as a positioner to keep each cable separated), and restrict cable twist (act as an anti-rotation mechanism). The term “gland“ shall be used in this specification sheet as the generic term for the cable restraint mechanism, piece or resilient member component of the backshell tha
23、t is used to provide a degree of environmental sealing, restrict the position of each cable, restrict movement during vibration and shock, and restricts cable twist. The gland may also be referred to as a grommet, resilient bushing, or spacer. The gland shall include an anti-rotation feature with a
24、corresponding feature in the backshell. The anti-rotation feature shall position the termini cavities in the gland so that these cavities align with those in the connector insert. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-64266/21 5 Als
25、o, the anti-rotation feature shall prevent radial movement of the gland (i.e., prevent twisting of the cabling) once placed in the backshell. Requirement for locking mechanism on the backshell coupling nut. The backshell coupling nut shall include a ratchet type locking mechanism (anti-coupling devi
26、ce) to ensure that a backshell mated to a connector maintains full thread engagement (maintains complete coupling). Complete coupling of the mated connector and backshell is achieved by a clockwise rotation of the coupling nut. The anti-coupling mechanism or feature shall be between the backshell co
27、upling nut and the backshell shell only. The locking mechanism shall be sufficient to ensure no backing off of the coupling nut during mechanical shock or vibration. Wrench flats on coupling nut. Front adapter coupling nuts shall contain wrench flats or a non-movable hex nut. This wrench flat or hex
28、 nut shall be sufficient to permit applying a torque for affixing the backshell to the connector (see figure 1, note 9). Cable diameter range. Cable restraint mechanism and environmental sealing design shall accommodate a single fiber cable with a minimum diameter of .067 inch (1.7 mm) and a maximum
29、 diameter of.087 inch (2.2 mm). Qualification. Qualification shall consist of performing testing specified as listed in table II. Backshells qualified to this specification sheet shall include a rear adapter without a platform (no type of cable entry interface). Provided by IHSNot for ResaleNo repro
30、duction or networking permitted without license from IHS-,-,-MIL-PRF-64266/21 6 TABLE II. Qualification inspections (except interoperability). Cable entry angle Shell size 11/ Fiber size (microns) Temperature range Environmental/non-E Specification sheet Test performed 2/, 8/, 9/, 12/ Straight Strai
31、ght 45 Degree 90 Degree 15 15 15 15 SM MM SM SM TR2 TR2 TR2 TR2 Environmental Environmental Environmental Environmental /21 /21 /21 /21 Group 1 (4 mated pairs) Interoperability 6/ X 7/ X 7/ X 7/ X 7/ Visual assembly not required. 6/ Interoperability. This testing is done by DLA Land and Maritime-TEB
32、 which maintains/retains the interoperability standards. Please note that separate test samples are required for interoperability testing. These test samples will then be retained by DLA Land and Maritime-TEB as interoperability standards. 7/ Interoperability is performed on both single mode and mul
33、timode for each shell size. 8/ Specific test practices for physical, mechanical, environmental and material tests, including clarifications and further details, are found in MIL-STD-1678-3. 9/ Specific test practices for the optical performance tests, including clarifications and further details, ar
34、e found in MIL-STD-1678-2. 10/ Shock test. Standard shock fixture 4A for bulkhead mounting shall be used. Supplement test fixture that shall be used and the mounting that shall be performed are specified in Measurement 3202 of MIL-STD-1678-3. Provided by IHSNot for ResaleNo reproduction or networkin
35、g permitted without license from IHS-,-,-MIL-PRF-64266/21 8 11/ See qualification by similarity for other shell sizes if shell size 15 is being qualified. Otherwise, use this qualification table for the other shell sizes also. 12/ Full qualification list for the backshell with a straight cable entry
36、 angle contains more testing requirements than the 45 or 90. Only by qualifying the straight backshell first, a further reduced test sequence as listed in the table can be used to qualify the backshell configurations with a 45 and 90 cable entry angle. Otherwise the full qualification listed for the
37、 backshell with the straight cable entry angle must be performed for backshell configurations with a 45 and 90 cable entry angle. Identification marking. Applicable. Both initial and after environmental testing. Banding strap attachment integrity. Not applicable. Backshell and backshell accessory at
38、tachment. Not applicable. Backshell-to-connector mating torque. The backshell threads shall withstand the applied torque to mate (affix) the backshell to the connector that is specified in table III with no damage. The backshell shall be mated to a connector mounted in a suitable fixture to prevent
39、movement of the connector during the test. The torque shall be applied to the backshell at a rate of approximately 10 in-lb per second until the specified applied torque is obtained. This torque shall be applied for a minimum of 1 minute. TABLE III. Backshell-to-connector mating torque. Shell size M
40、ating torque 1/ + 5 in-lb (+ .55 N-m) Composite Metal in-lb N-m in-lb N-m 11 50 5.65 100 11.30 13 50 5.65 150 16.95 15 50 5.65 150 16.95 17 50 5.65 150 16.95 19 50 5.65 150 16.95 21 100 11.30 175 19.75 23 100 11.30 175 19.75 25 100 11.30 175 19.75 1/ Increments are rounded to nearest 0.05 N-m for co
41、mpatibility with a torque wrench. Cable pull-out force. Not applicable. Cable seal flexing. Not applicable. Twist. Applicable. A 5 lb weight shall be applied to the entire cable bundle. Perform on a shell size 15 backshell. Mating durability. Not applicable. Backshell mating durability. Backshell sh
42、all be assembled and completely disassembled for 25 assembly (mating) cycles. Each cycle shall include connector-to-backshell coupling (mating) as part of the backshell assembly. No optical measurements need to be performed during or after this test. A separate piece of cabling may be used for this
43、test. This test may be performed prior to test sample assembly for Group I optical tests. External bending moment. Applicable. Applied bending moment shall be as specified in table IV. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-64266/21
44、9 TABLE IV. Backshell applied bending moment. Minimum applied bending moment 1/ Shell Composite Aluminum Stainless steel size(s) in-lb N-m in-lb N-m in-lb N-m 11 25 2.85 125 14.15 125 14.15 13 25 2.85 275 31.10 275 31.10 15 50 5.65 300 33.90 300 33.90 17 50 5.65 300 33.90 300 33.90 19 50 5.65 300 33
45、.90 300 33.90 21 75 8.50 300 33.90 300 33.90 23 75 8.50 300 33.90 300 33.90 25 100 11.30 300 33.90 300 33.90 1/ Increments are rounded to nearest 0.05 N-m for compatibility with a torque wrench. Impact. Applicable. Crush. Applicable. Water pressure. Not applicable. Freezing water immersion. Applicab
46、le. Sand and dust. Applicable. Electromagnetic effects. Applicable except for backshell classes D and E material designators. When not tested as part of the initial qualification, the backshell shall be assembled to a MIL-PRF-64266/1 or MIL-PRF-64266/3 receptacle. Electromagnetic effects testing sha
47、ll be conducted both with and without mating the MIL-PRF-64266/1 or MIL-PRF-64266/3 receptacle to a mating plug connector or dust cover. Salt spray. Applicable. Shell-to-shell conductivity. Applicable. Perform both initial and after salt spray. For a backshell mated to a connector plug, the voltage
48、drop of the mated connector plug-to-backshell shall be measured from a point on the rear accessory thread of the connector plug to a point exposed on the backshell rear adapter. For a backshell mated to a connector receptacle, the voltage drop of the mated connector receptacle-to-backshell shall be
49、measured from a point on the flange of the connector receptacle adjacent to the mounting hole to a point exposed on the backshell rear adapter. When tested as part of the initial qualification, the voltage drop between the connector receptacle and connector plug shall be measured also. Modified SO2/salt spray. Applicable. Altitude immersio
