1、 AMSC N/A 1 OF 4 FSC 5310 MS51971D 19 SEPTEMBER 2011 SUPERSEDING MS51971C 11 JULY 2007 MILITARY SPECIFICATION SHEET NUT, PLAIN, HEXAGON-STEEL, CORROSION RESISTING, 300 SERIES, PASSIVATED, UNC-2B This specification sheet is approved for use by all Departments and Agencies of the Department of Defense
2、. The requirements for acquiring the product described herein shall consist of this specification sheet and FF-N-836. FGH HAPPROX.015302302302ACCEPTABLE DESIGNSFIGURE 1. NUT, PLAIN, HEXAGON INCH-POUND Reactivated after 11 JULY 2007 and may be used for new and existing designs and acquisitions. Provi
3、ded by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS51971D 2 TABLE I. Dash numbers and dimensions NOMINAL SIZE OR BASIC MAJOR DIAMETER OF THREAD 1/4 .2500 5/16 .3125 3/8 .3750 7/16 .4375 1/2 .5000 9/16 .5625 5/8 .6250 3/4 .7500 7/8 .8750 1 1.0000 THREADS PE
4、R INCH 20 18 16 14 13 12 11 10 9 8 WIDTH NOM. 7/16 1/2 9/16 11/16 3/4 7/8 15/16 1-1/8 1-5/16 1-1/2 F ACROSS MAX. .4375 .5000 .5625 .6875 .7500 .8750 .9375 1.1250 1.3125 1.5000 FLATS MIN. .4280 .4890 .5510 .6750 .7360 .8610 .9220 1.0880 1.2690 1.4500 WIDTH G ACROSS MAX. .5050 .5770 .6500 .7940 .8660
5、1.0100 1.0830 1.2990 1.5160 1.7320 CORNERS MIN. .4880 .5570 .6280 .7680 .8400 .9820 1.0510 1.2400 1.4470 1.6530 NOM. 7/32 17/64 21/64 3/8 7/16 31/64 35/64 41/64 3/4 55/64 H THICKNESS MAX. .2260 .2730 .3370 .3850 .4480 .4960 .5590 .6650 .7760 .8870 MIN. .2120 .2580 .3200 .3650 .4270 .4730 .5350 .6170
6、 .7240 .8310 MATERIAL DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. STEEL, CORROSION RESISTING 1 2 3 4 5 6 7 8 9 10 NOMINAL SIZE OR BASIC MAJOR DIAMETER OF THREAD 1-1/8 1.1250 1-1/4 1.2500 1-3/8 1.3750 1-1/2 1.5000 1-3/4 1.7500 2 2.0000 2-1/4 2.2500 2-1/2
7、2.5000 2.3/4 2.7500 3 3.0000 THREADS PER INCH 7 7 6 6 5 4-1/2 4-1/2 4 4 4 WIDTH NOM. 1-11/16 1-7/8 2-1/16 2-1/4 2-5/8 3 3-3/8 3-3/4 4-1/8 4-1/2 F ACROSS MAX. 1.6875 1.8750 2.0625 2.2500 2.6250 3.0000 3.3750 3.7500 4.1250 4.5000 FLATS MIN. 1.6310 1.8120 1.9940 2.1750 2.5380 2.9000 3.2620 3.6250 3.988
8、0 4.3500 WIDTH G ACROSS MAX. 1.9490 2.1650 2.3820 2.5980 3.0310 3.4040 3.8970 4.3300 4.7630 5.1960 CORNERS MIN. 1.8590 2.0660 2.2730 2.4800 2.8930 3.3060 3.7190 4.1330 4.5460 4.9590 NOM. 31/32 1-1/16 1-11/64 1-9/32 1-1/2 1-23/32 1-59/64 2-9/64 2-23/64 2-37/64 H THICKNESS MAX. .9990 1.0940 1.2060 1.3
9、170 1.5400 1.7630 1.9700 2.1930 2.4150 2.6380 MIN. .9390 1.0300 1.1380 1.2450 1.4600 1.6750 1.8740 2.0890 2.3030 2.5180 MATERIAL DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. STEEL, CORROSION RESISTING 11 12 13 14 15 16 17 18 19 20 Requirements: 1. Materia
10、l: Steel, corrosion resisting, 300 series in accordance with FF-N-836. 2. Protective coating: Passivate in accordance with SAE-AMS 2700, Method 1, Class 4. 3. Magnetic permeability: These fasteners have a magnetic permeability of 2.0 maximum (air 1.0) for a field strength of H = 200 Oersteds using a
11、 magnetic indicator in accordance with ASTM-A-342/A342M, Test Method 1. 4. Threads: Threads shall be in accordance with FED-STD-H28/2. 5. Part number: The MS part number consists of the MS number, plus the dash number. Example: MS51971-1 Notes: 1. Unless otherwise specified, all dimensions in inches
12、. 2. In the event of a conflict between the text of this standard and the references cited herein, the text of this Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS51971D 3 standard shall take precedence. 3. Referenced government (or non-government
13、) documents of the issue listed in that issue of the department of defense index of specifications and standards (DoDISS) specified in the solicitation form a part of this standard to the extent specified herein. 4. Do not use unassigned part numbers. 5. AMS are SAE publications. 7. Changes from pre
14、vious issue: entire specification revised. INTERCHANGEABILITY TABLE The following nuts covered by dash numbers given in MS35690 are cancelled after the date indicated on the cancellation document. Use the dash numbers given in the preceding sheet. The cancelled nuts cannot always replace the new nut
15、s and should be used until existing stocks are depleted. Use only the new nuts for design and replacement. Replacement shall be in accordance with Table II. Interchangeability information regarding part numbers on the superseding drawing is also contained in this table. TABLE II Cancelled MS35690 Su
16、perseding MS51971 Cancelled MS35690 Superseding MS51971 Cancelled MS35690 Superseding MS51971 Dash No. Dash No. Dash No. Dash No. Dash No. Dash No. 410 510 610 710 810 910 1010 1 2 3 4 5 6 7 1210 1410 1610 1810 2010 2210 2410 8 9 10 11 12 13 14 2810 3210 3610 4010 4410 4810 15 16 17 18 19 20 INTERCH
17、ANGEABILITY TABLE The following nuts covered by dash numbers given in MS16203 (Ships) are cancelled after the date indicated on the cancellation document. Use the dash numbers given in the preceding sheet. The cancelled nuts cannot always replace the new nuts and should be used until existing stocks
18、 are depleted. Use only the new nuts for design and replacement. Replacement shall be in accordance with Table III. Interchangeability information regarding part numbers on the superseding drawing is also contained in this table. TABLE III Cancelled MS16203 (Ships) Superseding MS51971 Cancelled MS16
19、203 (Ships) Superseding MS51971 Cancelled MS16203 (Ships) Superseding MS51971 Dash No. Dash No. Dash No. Dash No. Dash No. Dash No. -1 -2 -3 -4 -1 -2 -3 -4 -5 -6 -7 -8 -5 -7 -8 -9 -9 -10 -11 -12 -10 -11 -12 -14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
20、 IHS-,-,-MS51971D 4 Custodians: Preparing activity: Army - AR DLA - IS Air Force - 99 (Project 5310-2011-012) NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
