NAS1352

SCREW, CAP, SOCKET HEAD, UNDRILLED AND DRILLED, PLAIN AND SELF-LOCKING, ALLOY STEEL, CORROSION RESISTANT STEEL
AND HEAT-RESISTANT STEEL, UNRC-3A AND UNRC-2A

TABLE I – DIMENSIONS AND STRENGTH VALUES

NOMINAL SIZE DASH NO	THREAD SIZE /18/	ØD BODY		ØA HEAD		H HEAD HEIGHT		S HEAD SIDE HEIGHT MIN	J SOCKET SIZE	T KEY ENGAGEMENT MIN	G WALL THICKNESS MIN	K CHAMFER OR RADIUS MAX
		MAX	MIN	MAX	MIN	MAX	MIN		NOMINAL
01	.0730-64	.073	.0695	.118	.112	.073	.070	.066	.062	.031	.025	.003
02	.0860-56	.086	.0822	.140	.134	.086	.083	.077	.078	.038	.029	.003
03	.0990-48	.099	.0949	.161	.154	.099	.095	.089	.078	.044	.034	.003
04	.1120-40	.112	.1075	.183	.176	.112	.108	.101	.094	.051	.038	.005
06	.1380-32	.138	.1329	.226	.218	.138	.134	.124	.109	.064	.047	.005
08	.1640-32	.164	.1585	.270	.262	.164	.159	.148	.141	.077	.056	.005
3	.1900-24	.190	.1840	.312	.303	.190	.185	.171	.156	.090	.065	.005
4	.2500-20	.250	.2435	.375	.365	.250	.244	.225	.188	.120	.095	.008
5	.3125-18	.3125	.3053	.469	.457	.312	.306	.281	.250	.151	.119	.008
6	.3750-16	.375	.3678	.562	.550	.375	.368	.337	.312	.182	.143	.008
7	.4375-14	.4375	.4294	.656	.642	.437	.430	.394	.375	.213	.166	.010
8	.5000-13	.500	.4919	.750	.735	.500	.492	.450	.375	.245	.190	.010
10	.6250-11	.625	.6163	.937	.921	.625	.616	.562	.500	.307	.238	.010
12	.7500-10	.750	.7406	1.125	1.107	.750	.740	.675	.625	.370	.285	.010
14	.8750-9	.875	.8647	1.312	1.293	.875	.864	.787	.750	.432	.333	.015
16	1.0000-8	1.000	.9886	1.500	1.479	1.000	.988	.900	.750	.495	.380	.015
20	1.2500-7	1.250	1.2336	1.875	1.852	1.250	1.236	1.125	.875	.620	.475	.015
24	1.5000-6	1.500	1.4818	2.250	2.224	1.500	1.485	1.350	1.000	.745	.570	.015

MATERIAL:

ALLOY STEEL IN ACCORDANCE WITH PROCUREMENT SPEC FF-S-86.
CORROSION-RESISTANT STEEL IN ACCORDANCE WITH PROCUREMENT SPEC FF-S-86.
HEAT-RESISTANT STEEL CONFORMING TO CHEMISTRY OF AMS5731 (UNS S66286) OR AMS5737 (UNS S66286) COLD WORKED AND AGE
HARDENED TO MEET THE FASTENER REQUIREMENTS OF FF-S-86 AND THIS STANDARD.

FINISH: ALLOY STEEL – CADMIUM PLATE IN ACCORDANCE WITH AMS-QQ-P-416, TYPE II, CLASS 2.
-BLACK OXIDE IN ACCORDANCE WITH MIL-DTL-13924, CLASS 1.

CORROSION-RESISTANT STEEL
-CADMIUM PLATE IN ACCORDANCE WITH AMS-QQ-P-416, TYPE I,CLASS 2.
-SILVER FLASH IN ACCORDANCE WITH AMS2411.
-PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 1, TYPE 6 OR TYPE 137, CLASS 4.
-PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 1, TYPE 8, 13 CLASS 4 – NO POST TREATMENT.
-PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 2 – NO POST 13 TREATMENT.

HEAT-RESISTANT STEEL
– SILVER FLASH IN ACCORDANCE WITH AMS2411.
-PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 1, TYPE 2 OR TYPE 8, CLASS 4.
-PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 1, TYPE 8, CLASS 4 – NO POST TREATMENT.
-PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 2 – NO POST TREATMENT.
-BLACK OXIDE IN ACCORDANCE WITH MIL-DTL-13924, CLASS 3.
-CADMIUM PLATE IN ACCORDANCE WITH AMS-QQ-P-416, TYPE II, CLASS 2.

CODE: MATERIAL CODE AFTER BASIC NUMBER.

“-” = ALLOY STEEL.
“C” = CORROSION-RESISTANT STEEL.
“N” = HEAT-RESISTANT STEEL.

FIRST DASH NUMBER DESIGNATES SCREW THREAD SIZE AS TABULATED.

TYPE CODE AFTER FIRST DASH NUMBER:
“H” = DRILLED HEAD.
“LE” = SELF-LOCKING MALE THREADED FASTENER.
(OPTIONAL TYPE LOCKING ELEMENT IN ACCORDANCE WITH NAS1283).

“LL” = SELF-LOCKING MALE THREADED FASTENER.
(LONGITUDINAL STRIP LOCKING ELEMENT IN ACCORDANCE WITH NAS1283, TYPE L).

“LN” = SELF-LOCKING MALE THREADED FASTENER.
(PELLET LOCKING ELEMENT IN ACCORDANCE WITH NAS1283, TYPE N).

“LB” = SELF-LOCKING MALE THREADED FASTENER.
(PATCH TYPE LOCKING ELEMENT IN ACCORDANCE WITH NAS1283, TYPE P).

SECOND DASH NUMBER DESIGNATES NOMINAL LENGTH IN SIXTEENTHS OF AN INCH AS TABULATED IN TABLE II. TABULATED CODING IN
TABLE II INDICATES PREFERRED LENGTHS.
ADDITIONAL LENGTHS AVAILABLE ON SPECIAL ORDER, MINIMUM RUN BASIS.
FOR SUCH LENGTHS ADDITIONAL CODING MAY BE ASSIGNED TO LENGTHS IN .0625 INCH INCREMENTS UP TO 3.500 INCHES, AND IN .125
INCH INCREMENTS FROM 3.500 INCHES UP TO AND INCLUDING 6.000 INCHES.

FINISH CODE AFTER SECOND DASH NUMBER:

ALLOY STEEL,
“P” = CADMIUM PLATE.
NO SUFFIX FOR BLACK OXIDE.

CORROSION-RESISTANT STEEL,
“P” = CADMIUM PLATE.
“S” = SILVER FLASH.
NO SUFFIX FOR PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 1, TYPE 6 OR TYPE 7, CLASS 4.
“G” = PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 2 – NO POST TREATMENT.
“M” = PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 1, TYPE 8, CLASS 4 – NO POST TREATMENT.

HEAT-RESISTANT STEEL,
“S” = SILVER FLASH.
“B” = BLACK OXIDE. “P” = CADMIUM PLATE.
NO SUFFIX FOR PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 1, TYPE 2 OR TYPE 8, CLASS 4. TREATMENT.
“G” = PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 2 – NO POST TREATMENT.
“M” = PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 1, TYPE 8,CLASS 4 – NO POST TREATMENT.