1、 INCH-POUNDMS51552A11 September 1997SUPERSEDINGMS5155215 September 1987MILITARY STANDARDNUT, SELF-LOCKING, PLATE, RIGHT ANGLEFLOATING, 125 KSI Ftu 450FTHIS SPECIFICATION IS APPROVED FOR USE BY ALL DEPARTMENTS ANDAGENCIES OF THE DEPARTMENT OF DEFENSE.THE REQUIREMENTS FOR ACQUIRING THE PRODUCT DESCRIB
2、ED HEREIN SHALL CONSIST OF THIS STANDARD,AND THE LATEST ISSUE OF THE FOLLOWING SPECIFICATION LISTED IN THAT ISSUE OF THE DEPARTMENT OFINDEX OF SPECIFICATIONS AND STANDARDS (DODISS) SPECIFIED IN THE SOLICITATION: THE PROCUREMENTSPECIFICATION MIL-N-25027.TABLE I DIMENSIONSTHREADSIZEA.005B(MAX)C.002D(M
3、IN)E.005H(MAX)L(MAX)Q(REF)T(REF)W(MAX)AXIALSTRENGTHLBS/MINAPPROXWEIGHTLBS/100.1120-40UNJC-3B .325 .347 .219 - .170 .153 .684 .180 .025 .330 750 .30.1380-32UNJC-3B .325 .347 .219 - .170 .170 .684 .180 .025 .330 1,130 .32.1640-32UNJC-3B .375 .425 .219 .168 .210 .250 .734 .230 .032 .420 1,720 .52.1900-
4、32UNJF-3B .375 .425 .219 .194 .210 .250 .734 .230 .032 .420 2,460 .54TABLE II. DASH NUMBERS.DASH NUMBERSTHREAD STEEL CRESSIZE NON DRY FILM LUBE DRY FILM LUBE DRY FILM LUBE.1120-40UNJC-3B NO4 LO4 CLO4.1380-32UNJC-3B NO6 LO6 CLO6.1640-32UNJC-3B NO8 LO8 CLO8.1900-32UNJF-3B N3 L3 CL3AMSC N/A 1 of 3 FSC
5、5310DISTRIBUTION STATEMENT A. APPROVED FOR PUBLIC RELEASE; DISTRIBUTION IS UNLIMITED.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS51552A2REQUIREMENTS:1. MATERIAL: CARBON, STEEL, GRADES 1035 (UNS G10350), 1040 (G10400) OR 1050 (UNS G10500) INACCO
6、RDANCE WITH ASTM A29.ALLOY STEEL, GRADES 4130 (UNS G41300), 4340 (UNS G43400), OR 8740 (UNS G87400) INACCORDANCE WITH ASTM A29.CORROSION-RESISTANT STEEL, NUT AND BASKET, TYPE A286 (UNS S66286) IN ACCORDANCEWITH AMS 5525, AMS 5732, AMS 5737, OR BASKET TYPE 321 (UNS S32100), IN ACCORDANCEWITH AMS 5510
7、.2. PROTECTIVE COATING AND SURFACE TREATMENT : STEEL NUTS, CADMIUM PLATE INACCORDANCE WITH QQ-P-416, TYPE II, CLASS 2. CRES NUTS SHALL BE CLEANED DESCALEDAND PASSIVATED IN ACCORDANCE WITH ASTM A967.3. HARDNESS: 49 HRC, MAX.4. LUBRICANT: MOLYBDENUM DISULFIDE DRY FILM LUBRICANT IN ACCORDANCE WITH MIL-
8、N-25027. OTHER LUBRICANTS SOLUBLE IN CLEANER SPECIFIED IN THE PROCUREMENTSPECIFICATION. CRES NUTS LIMITED TO FIVE (5) REUSE CYCLES.5. SURFACE TEXTURE: SURFACE TEXTURE SHALL BE Ra 125 MICRO INCHES MAXIMUM INACCORDANCE WITH ASME B46.1.6. FOAT OF NUT ELEMENT: FLOAT OF NUT ELEMENT PORTION OF ASSEMBLY SH
9、ALL NOT BELESS THAN .020 RADIALLY FROM CENTERED POSITION. NUT ELEMENT SHALL BE CAPABLE OFENGAGEMENT WITH BOLT IN THE MAXIMUM MISALIGNED POSITION.7. THREADS: THREADS SHALL BE IN ACCORDANCE WITH MIL-S-8879 BEFORE LUBRICATION.THREAD ACCEPTABILITY SHALL BE IN ACCORDANCE WITH ASME B1.3, SYSTEM 21.8. PART
10、 NUMBER: THE PART NUMBER CONSISTS OF THE BASIC MS SHEET NUMBERFOLLOWED BY A MATERIAL CODE AND DASH NUMBER FROM TABLE II.EXAMPLE: MS51552 CL3DASH NUMBERBASIC MS SHEET NUMBERMS51552CL3 INDICATES NUT, SELF-LOCKING, PLATE, RIGHT ANGLE, CRES, 125 KSI FTU, 450FDRY FILM LUBRICATED, THREAD SIZE; .1900-32 UN
11、JF-3B.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS51552A3NOTES:1. ALL DIMENSIONS ARE INCHES, UNLESS OTHERWISE SPECIFIED.2. PLATE NUTS MANUFACTURED PRIOR TO REVISION “A” ARE ACCEPTABLE UP TO TWOYEARS FROM DATE OF REVISION “A”.3. THERE IS NO QPL
12、ASSOCIATED WITH MS51552.4. DESIGN AND USAGE LIMITATIONS: THESE NUTS ARE DESIGNED TO DEVELOP A TENSILESTRENGTH OF 125 KSI BASED ON THE CROSS SECTIONAL AREA AT THE BASIC ROOT DIAMETEROF THE THREAD. THESE NUTS ARE DESIGNED TO BE USED WITH CLASS 3A THREADS. THESENUTS SHALL BE USED IN ACCORDANCE WITH THE
13、 LIMITATIONS OF MS33588.5. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS STANDARD AND THE REFERENCESCITED HEREIN, THE TEXT OF THIS STANDARD SHALL TAKE PRECEDENCE.6. REFERENCED GOVERNMENT (OR NON-GOVERNMENT) DOCUMENTS OF THE ISSUE LISTED INTHAT ISSUE OF THE DEPARTMENT OF DEFENSE INDEX OF SPECIF
14、ICATION AND STANDARDS(DODISS) SPECIFIED IN THE SOLICITATION FORM A PART OF THE STANDARD TO THE EXTENTSPECIFIED HEREIN.CUSTODIANS: PREPARING ACTIVITY:ARMY - AR DLA - ISNAVY - ASAIR FORCE - 99 (PROJECT 5310-2335)REVIEW ACTIVITIES:ARMY - AT, AV, CR, MIProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
