NAS1580-NAS1581

BOLT, 100º FLUSH HEAD

NAS1581

.

nessDAsH no.	TFIR EAD UNJF-3A	A DIA MAX (b)	BDIA MIN			MAX (b)	REF (b)	M GAG- E PROT (*)	N	P DIA	R RAD	T	U REF	V GAG-	Y TIR	Z (e)	‹1)
				Plate-d	Un- Plate-d
-3	.1900-32	.3813	.339	.1895 .1885	.1895 .1890	.O15	.083	.0285 .0255	.126 .106	.080 .070	.035 .015	.363	.050	.3147 .3145	.005	.OO4O	3,180
-4	.2500-28	.5066	.464	.2495 .2485	.2495 .2490	.015	.111	.0351 .0319	.126 .106	.086 .076	.035 .015	.403	.050	.4245 .4243	.OO6	.OO3O	5,790
-5	.3125-24	.6335	.578	.3120 .3110	.3120 .3115	.015	.140	.0409 .0370	.130 ,110	.086 .076	.045 .025	.501	.060	.5389 .5387	.OO7	.OO3O	9,260
-6	.3T50-24	.7604	.71T	.3745 .3735	.3745 .3740	.015	.16T	.0459 .0422	.130 ,110	.116 .106	.045 .025	.594	.060	.6532 .6530	.008	.0025	14,000
-7	.4375–20	.8884	.826	.4370 .4360	.4370 .4365	.022	.195	.0470 .0425	.134 .114	.116 .106	.055 .035	.675	.080	.7784 .7782	.009	.0025	]9,OOO
-8	.5000-20	1.01-39	.951	.4995 .4985	.4995 .4990	.O22	.222	.0529 .0482	.134 .114	.116 .106	.055 .035	.768	.080	.8902 .8900	.OIO	.0020	25,600
-9	.5625-18	1.14- 08	1.071	.5615 .5605	.5615 .5610	.O25	.250	.0590 .0541	.134 .114	.151 .141	.055 .035	.881	.090	1.00- 28 1.00- 26	.010	.0020	32,400
-10	.6250-18	1.27-	1.201	.6240 .6230	.6240 6235	025	.280	.0683 .0631	.134 .114	.151 .141	.055 .035	.981	.090	1.11-24 1.11-22	.010	.0020	40,900

FIRST DASH NO.	RECESS NO.	J MAX	w D MAX	GAGE PENETRATDN		Recess Torque In. Lbs. Min
				MIN	MAX
-3	10	.090	.248	.0560	.0685	50
-4	1/4	.118	.325	.0750	.0890	125
-5	5/16	.122	.357	.0700	.0860	250
-6	3/8	.145	.427	.0850	.1030	430
-7	7/16	.169	.498	.1005	.1205	925
-8	1/2	.193	.568	.1155	.1375	1210
-9	9/16	.217	.638	.1305	.1545	1760
-10	5/8	.241	.708	.1450	.1710	2460

FIRST DASH NO.	RECE- SS NO	J		K REF	W REF	Recess Torque In. Lbs. Min
		MIN	MAX
-3	3	.042	.045	.305	.110	50
-4	4	.051	.054	.422	.134	125
-5	5	.061	.064	.490	.160	250
-6	6	.084	.088	.639	.198	430
-7	7	.096	.100	.715	.224	925
-8	8	.101	.105	.766	.256	1210
-9	9	.114	.118	.877	.300	1760
-10	10	.137	.141	1.020	.344	2460

MATERIAL:

ALLOY STEEL -4140 PER MIL-5-5626, 4340 PER MIL-5-5000 OR 8740 PER MIL-5-6049. 6AL-4V TITANIUM ALLOY PER AMS4928 OR
AMS4967. A-286 CRES PER AMS5731 , AMS7532 OR AMS5737 (SEE “CODE”).

HEAT TREAT:

ALLOY STEEL: 160,000 – 180,000 PSI MINIMUM TENSILE STRENGTH.
A-286 CRES: 160,000 – 180,000 PSI MINIMUM TENSILE STRENGTH.z
6AL-4V Ti: 160,000 – 180,000 PSI MINIMUM TENSILE STRENGTH.

FINISH:

PASSIVATE PER QQ-P-35 OR CADMIUM PLATE PER QQ-P 416, TYPE II, CLASS 2, (SEE “CODE”)

CODE:

FIRST DASH NUMBER INDICATES NOMINAL DIAMETER IN 16THS. SECOND DASH NUMBER INDICATES GRIP LENGTH IN 0.625 INCH
INCREMEMNTS.

MATERIAL:

CODE LETTER “A” FOLLOWING BASIC PART NUMBER INDICATES ALLOY STEEL. CODE LETTER “C” FOLLOWING BASIC PART NUMBER INDICATES
A-286 CRES. CODE LETTER “V” FOLLOWING BASIC PART NUMBER INDICATES 6AL-4V TITANIUM.

FINISH:

ALLOY STEEL: TYPE II, CLASS 2, CADMIUM PLATE. A-286 CRES: NO CODE LETTER FOLLOWING SECOND NUMBER INDICATES PASSIVATE.
CODE LETTER “P” FOLLOWING SECOND DASH NUMBER INDICATES TYPE II, CLASS 2, CADMIUM PLATE. 6AL-4V Ti: NO FINISH.

RECESS:

CODE LETTER “H” FOLLOWING FIRST DASH NUMBER INDICATES HI-TORQUER RECESS PER MS33750 CODE LETTER “R” FOLLOWING FIRST DASH
NUMBER INDICATES TORQ-SET RECESS PER MS14191 FORCODE LETTER “T” FOLLOWING FIRST DASH NUMBER INDICATES TORQ-SETS RECESS
PER MS33781 SIZES 3, 4, AND 5.

DRILL:

CODE LETTER “D” FOLLOWING SECOND DASH NUMBER INDICATES DRILLED THREADS.
OVERSIZE: CODE LETTERS “X” OR “Y” FOLLOWING SECOND DASH NUMBER INDICATE REPLACEMENT BOLT. WHEN MORE THAN ONE CODE LETTER
IS USED FOLLOWING SECOND DASH NUMBER, ARRANGE LETTERS ALPHABETICALLY.

NAS1581

BOLT, 100º FLUSH REDUCED HEAD

FIRST DASH NO.	THREAD UNJF-3A	A DIA MAX	B DIA MIN	BFORE PLATE	PLATED	UN- PLATED	E MAX(b)	H REF(b)	M GAGE PROT(c)	R RAD	T	U REF(f)	V GAGF DIA	Y TIR(d)	Z TIR(e)	TENSILE STRENGTH LBS. MIN(i)
-3	.1900-32	.3047	.2578	1887 .1881	.1895 .1885	.1895 .1890	.015	.049	.0250 .0210	.020 .010	.363	.050	.2441 .2439	.005	.0040	2,000
-4	.2500-28	.3988	.3504	.2487 .2481	.2495 .2485	.2495 .2490	.015	.063	.0278 .0232	.020 .010	.403	.050	.3315 .3313	.006	.0030	3,700
-5	.3125-24	.4787	.4289	.3112 .3106	.3120 .3110	.3120 .3115	.015	.070	.0305 .0255	.025 .010	.501	.060	.4047 .4045	.007	.0030	5,000
-6	.3750-24	.5662	.5149	.3737 .3181	.3745 .3735	.3745 .3740	.015	.081	.0333 .0277	.030 .015	.594	.060	.4854 .4852	.008	.0025	7,200
-7 (j) -7B	4375-20	.6741	.6047	.4362 .4356	.4370 .4360	.4370 .4365	.022	.100	.0430 .0370	.030 .015	.675	.080	.5697 .5695	.009	.0025	10,000 9,000
-8	.5000-20	.7611	.6901	.4987 .4981	.4995 .4985	.4995 .4990	.022	.111	.0458 .0392	.030 .015	.768	.080	.6499 .6497	.010	.0020	13,500
-9	.5625-18	.8449	.7655	.5607 .5601	.5615 .5605	.5615 .6510	.025	.119	.0515 .0445	.030 .015	.881	.090	.7200 .7198	.010	.0020	17,000
-10	.6250-18	.9329	.8518	.6232 .6226	.6240 .6230	.6240 .6235	.025	.130	.0543 .0467	.030 .015	.981	.090	.8011 .8009	.010	.0020	21,000

FIRST DASH NO.	RECESS NO.	J MAX	W DIA MAX	GAGE PENETRATION		Recess Torque In. Lbs. Min
				MIN	MAX
-3	8	.078	.215	.0480	.0595	37
-4	10	.090	.248	.0560	.0685	50
-5	1/4	.118	.325	.0750	.0890	125
-6	5/16	.122	.357	.0700	.0860	250
-7	3/8	.145	.427	.0850	.1030	430
-8	7/16	.169	.498	.1005	.1205	760
-9	1/2	.193	.568	.1155	.1375	1060
-10	9/16	.217	.638	.1305	.1545	1140

FIRST DASH NO.	RECE- SS NO.	J		K REF	W REF	Recess Torque In. Lbs. Min
		MIN	MAX
-3	2	.036	.039	.224	.100	37
-4	3	.042	.045	.300	.110	50
-5	4	.046	.049	.394	.134	125
-6	5	.061	.064	.484	.160	250
-7	6	.066	.070	.571	.198	430
-8	7	.082	.086	.660	.224	760
-9	8	.094	.098	.731	.256	1060
-10	9	.100	.104	.819	.300	1440

MATERIAL:

ALLOY STEEL – 4140 PER MIL-S-5626, 4340 PER MIL-S-5000 OR 8740 PER MIL-S-6049. 6AL-4V TITANIUM ALLOY PER AMS4928 OR
AMS4967. A-286 CRES PER AMS5731, AMS7532 OR AMS5737 (SEE “CODE”).

HEAT TREAT:

ALLOY STEEL: 160,000 – 180,000 PSI MINIMUM TENSILE STRENGTH.
A-286 CRES: 160,000 – 180,000 PSI MINIMUM TENSILE STRENGTH.
6AL-4V TL: 160,000 – 180,000 PSI MINIMUM TENSILE STRENGTH.

FINISH:

PASSIVATE PER QQ-P-35 OR CADMIUM PLATE PER QQ-P 416, TYPE II, CLASS 2 OR
TYPE II, CLASS 3 (SEE “CODE”).

CODE:

FIRST DASH NUMBER INDICATES NOMINAL DIAMETER IN 16THS. SECOND DASH NUMBER INDICATES GRIP LENGTH IN .0625 INCH
INCREMEMNTS. 6
MATERIAL: CODE LETTER “A” FOLLOWING BASIC PART NUMBER INDICATES ALLOY STEEL. CODE LETTER “C” FOLLOWING
BASIC PART NUMBER INDICATES A-286 CRES. CODE LETTER “V” FOLLOWING BASIC PART NUMBER INDICATES 6AL-4V TITANIUM.
FINISH: ALLOY STEEL: TYPE II, CLASS 2, 6 CADMIUM PLATE.
A-286 CRES: NO CODE LETTER FOLLOWING SECOND NUMBER INDICATES PASSIVATE.
CODE LETTER “P” FOLLOWING SECOND DASH NUMBER INDICATES TYPE II, CLASS 2, 6 CADMIUM PLATE.
6AL-4V TL: NO FINISH. 6
RECESS: CODE LETTER “H” FOLLOWING FIRST DASH NUMBER INDICATES HI-TORQUE ® RECESS PER MS33750 CODE
LETTER “R” FOLLOWING FIRST DASH NUMBER INDICATES TORQ-SET ® RECESS PER MS14191 FOR
SIZES 3, 4 AND 5.
CODE LETTER “T” FOLLOWING FIRST DASH NUMBER INDICATES TORQ-SET ® RECESS PER MS33781 OVERSIZE: CODE LETTER “X” FOLLOWING
SECOND DASH NUMBER INDICATES REPLACEMENT BOLT.