CAPTIVE SCREW ASSEMBLY, FULLY RETRACTED, NON-FLOATING, SPRING LOADED, NUT RETAINER TYPE, .138-32 THRU .250-28
THREAD SIZES
current revision available for download at LISI Aerospace
Click on Drawings to Enlarge
TABLE 1:
| NOMINAL SIZE FIRST DASH NUMBER |
T THREAD SIZE |
ΦA ±.015 |
B ±.030 |
B1 ±..30 |
C ±.015 |
ΦD ±.015 |
ΦE REF |
F HEX SIZE |
G SEE FIGURE 2 |
H HEX |
USE NUT RETAINER |
TENSILE STRENGTH LBS. MINIMUM |
|
| 300 SERIES |
A286 | ||||||||||||
| -06 | .138-32UNC-3A | .260 | .710 | .650 | .312 | .250 | .117 | .125 | .062 | .250 .244 |
CA28085-06-() | 248 | 248 |
| -08 | .164-32UNC-3A | .300 | .800 | .740 | .312 | .315 | .143 | .156 | .062 | .312 .305 |
CA28085-3-() | 1,120 | 1,207 |
| -3 | .190-32UNF-3A | .300 | .810 | .750 | .312 | .315 | .169 | .156 | .062 | .312 .305 |
CA28085-3-() | 1,207 | 1,207 |
| -4 | .250-28UNF-3A | .400 | 1.055 | 1.020 | .375 | .440 | .226 | .187 | .070 | .438 .428 |
CA28085-4-() | 2,046 | 2,046 |
TABLE 2:
FOR .138-.32, .164-32
AND .190-32 THREAD SIZES
| SECOND DASH NUMBER |
L ±.015 |
| -6 | .375 |
| -7 | .438 |
| -8 | .500 |
| -9 | .562 |
| -10 | .625 |
| -11 | .688 |
| -12 | .750 |
| -13 | .812 |
| -14 | .875 |
| -15 | .938 |
| -16 | 1.000 |
TABLE 3:
FOR .250-28 THREAD SIZES
| SECOND DASH NUMBER |
L ±.015 |
| -7 | .438 |
| -8 | .500 |
| -9 | .562 |
| -10 | .625 |
| -11 | .688 |
| -12 | .750 |
| -13 | .812 |
| -14 | .875 |
| -15 | .938 |
| -16 | 1.000 |
| -17 | 1.062 |
| -18 | 1.125 |
| -19 | 1.188 |
| -20 | 1.250 |
NOTES; UNLESS OTHERWISE SPECIFIED:
1. MARERIAL: STANDARD SCREW ASSEMBLY:
1.1 SCREW: 18-8 TYPE 300 SERIES CRES PER AMS-QQ-S-763, AMS5640, ASTM-A484 AND/OR ASTM-A-582.
1.2 HOUSING: 18-8 TYPE 300 SERIES CRES PER AMS56401, ASTM-A484 AND/OR ASTM-A582.
1.3 SPRING: 18-8 TYPE 302 SERIES CRES PER ASTM-A580 AND/OR ASTM-A313.
1.4 FLATWASHER: 18-8 TYPE 302 SERIES CRES CONDITION A PER ADS5516 AND-OR MIL-S-5059.
1.5 LOCKWASHER: 18-8 TYPE 300 SERIES CRES PER AMS-QQ-SS763 AND/OR AMS-S-7720.
1.6 OPTIONAL SCREW ONLY: A286 CRES PER AMS5731 AND/OR AMS5737 DESIGMA BT LETTER “C”.
2. HEAT TREAT:
2.1 300 SERIES – NONE
2.2 A286 CRES 140,000 PSI MINIMUM PER AMS2700.
3. FINISH:
3.1 STANDARD: PASSIVATED PER AMS2700.
3.2 BLACK OXIDE PER MIL-DLT-13924, DESIGNATED BY LETTER “B”.
4. CODE:
4.1 FIRST DASH NUMBER DESIGNATES THREAD SIZE
SECOND DASH NUMBER INDICATES “L” IN .0625 INCREMENTS CONVERTED TO 3 DECIMAL PLACES.(SEE TABLES 2 AND 3)
4.2 “C” IN LIEU OF FIRST DASH DESIGNATES A286 CRES, SCREW ONLY.
4.3 “B” FOLLOWING FIRST DASH NUMBER DESIGNATES BLACK OXIDE ONLY.
4.4 “S” “P” OR “HS” FOLLOWING LAST DASH NUMBER INDICATES RECESS.
4.4.1 “S” = SLOTTED PER ANSI B18.6.3 TYPE 1.
4.4.2 “P” = CROSS RECESS PER ANSI B18.6.3 TYPE 1.
4.4.3 “HS” = HEX SOCKET PER ANSI B18.6.3 (SEE TABLE 1, “F” MIDENSION FOR SIZES).
4.4.4 “HH” = HEX HEAD O RECESS.
4.4.5 “K” = FOLLOWING RECESS DESIGNATION INDICATES KNURLED HEAD, EXCEPT NO KNURL OPTION FOR HEX SOCKET
OR HEX HEAD.
5. IF ORDERING CAPTIVE SCREW ASSEMBLIES WITH SHORTER “L” LENGTHS NOT LISTED IN TABLES 2 AND 3, THE THREAD LENGTHS WILL
BE SHORTER THAN THOSE LISTED IN TABLE 1 (DIMENSION “C”). APPROXIMATE THREAD LENGTHS = L-G. SEE FIGURE 2 AND TABLE 1.
6. DESIGNAED TO BE USED WITH CA28085-()-(), NUT RETAINER.
7. FOR INSTALLATION SEE CAL-STD-0140
8. PART CALLOUT EXAMPLE:
<9> PARTS TO BE IDENTIFIED WITH LOCATION OPTIONAL.