| 規格 ナット （4） SeekAtec |
MS21042/NAS1291 フランジ ナット （K ナット） |
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| PROCUREMENT SPECIFICATION |
TITLE | CLASSIFICATION |
| MIL-N-25027 | NUTS, SELF LOCKING REDUCED HEXAGON、 REDUCED HEIGHT, RING BASE, CORROSION AND NON-CORROSION RESISTANT STEEL |
STANDARD PART MS21042/NAS1291 |
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| SIZE DASH NO. |
THREADa | A MAX |
B MIN |
C MAX |
D | Ed MIN |
Fe MIN |
G | H | J MIN |
Wc | Xb | AXIALf STRENGTH MIN, lb |
WEIGHT LB/100 MAX |
WRENCHING TORQUE TESTf VALUE in-lb |
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| MAX | MIN | MAX | MIN | MAX | MIN | MAX | MIN | |||||||||||||||
| 02 | 2-56 UNC-3B | .167 | .137 | .138 | .106 | .086 | .045 | .019 | .021 | .004 | .100 | .080 | .010 | .127 | .122 | .0025 | 660 | .020 | 5 | |||
| 04 | 4-40 UNC-3B | .206 | .176 | .171 | .142 | .112 | .050 | .028 | .027 | .005 | .125 | .103 | .158 | .150 | .003 | 1,110 | .050 | 10 | ||||
| 06 | 6-32 UNC-3B | .244 | .214 | .207 | .168 | .138 | .055 | .039 | .031 | .006 | .141 | .115 | .190 | .181 | 1,670 | .080 | 20 | |||||
| 08 | 8-32 UNC-3B | .290 | .260 | .244 | .194 | .164 | .060 | .041 | .188 | .125 | .015 | .221 | .213 | 2,490 | .150 | 30 | ||||||
| 3 | 10-32 UNF-3B | .330 | .290 | .277 | .220 | .190 | .065 | .043 | .154 | .252 | .243 | 3,470 | .180 | 60 | ||||||||
| 4 | 1/4-28 UNF-3B | .420 | .386 | .347 | .280 | .250 | .090 | .057 | .036 | .007 | .219 | .204 | .019 | .316 | .304 | 6,200 | .350 | 150 | ||||
| 5 | 5/16-24 UNF-3B | .520 | .486 | .419 | .342 | .312 | .120 | .077 | .042 | .008 | .266 | .251 | .023 | .378 | .367 | .004 | 9,820 | .600 | 330 | |||
| 6 | 3/8-24 UNF-3B | .620 | .575 | .491 | .405 | .375 | .125 | .089 | .282 | .267 | .030 | .440 | .430 | 15,200 | .800 | 530 | ||||||
| 7 | 7/16-20 UNF-3B | .708 | .680 | .562 | .467 | .437 | .160 | .328 | .313 | .035 | .504 | .494 | 20,600 | 1.30 | 825 | |||||||
| 8 | 1/2-20 UNF-3B | .814 | .786 | .633 | .530 | .500 | .225 | .410 | .350 | .040 | .566 | .556 | 27,500 | 2.10 | 1,125 | |||||||
| 9 | 9/16-18 UNF-3B | .912 | .874 | .775 | .592 | .562 | .320 | .480 | .420 | .045 | .692 | .680 | 34,800 | 3.60 | 1,550 | |||||||
| 10 | 5/8-18 UNF-3B | 1.014 | .976 | .846 | .655 | .625 | .365 | .550 | .490 | .050 | .755 | .743 | 43,600 | 4.50 | 2,000 | |||||||
| All dimensions in inches. nut dash size 7 and larger use NAS1291 prefix,
stainless steel nuts use NAS 1291C designation. (a) Threads in accordance with MIL-S-7742 before lubrication. (b) Bearing surface shall be square with pitch diameter within X when measured in accordance with MIL-N-25027. (c) Dimension across flats includes deformation of locking device. (d) Minimum length of each wrenching corner. (e) Minimum distance from the washer face of the nut to the beginning of the minimum length E of each wrenching corner. (f) For alloy steel nuts. For A286 nuts multiply these valies by .694 MATERIAL: Alloy steel or A286 corrosion-resistant steel (NAS1291C designation) PLATING: Plain cadmium-plated nuts in accordance with QQ-P-416, Type ll, Class 3. Dry film lubricated nuts in accordance with QQ-P-416. NAS 1291C designation nuts: silver plate per AMS2410. LUBRICANT: Dry film lubricant approved in accordance with MIL-N-25027. Others lubricants soluble in the cleaner specified in procurement spesification. For USAF applications, nuts treated with dry film lubricants shall not be utilized in integral fuel tanks. HARDNESS: Rockwell C49 minimum. (alloy steel nuts) . Break all sharp edges and remove all hanging burrs and silvers which might become dislodged under usage. Surface roughness in accordance with MIL-STD-10. Unless otherwise specified the surface roughness shall not exceed 125 uin. These nuts shall be used in accordance with the limitation of MS33588. |
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| 注：指示なきすべての寸法はインチ. 1インチ＝24.5mm | ||||||||||||
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