What is a double threaded bolt?

Double end bolt also call A threaded stud, or a double threaded bolt is a steel bolt that is typically threaded on both ends. The stud is then screwed into a metal surface and placed between two objects, and then secured with a nut on the opposite end of the bolt. Threaded studs are normally stronger than a standard. Double ends studs are designed to be used where one of the threaded ends is installed in a tapped hole and a hex nut is used on the other end to clamp a fixture onto the surface that the stud has been threaded into. Another name that is also sometimes used for Double End Studs is Tap End Stud. materials can be stainless steel A2 A4, brass, copper, steel.

Clamping type studs Chart

screw thread(d)			1/4	5/16	3/8	7/16	1/2	9/16	5/8	3/4	7/8	1	1-1/8	1-/1/4	1-3/8
d			0.25	0.3125	0.375	0.4375	0.5	0.5625	0.625	0.75	0.875	1	1.125	1.25	1.375
b	min	When L≤10	0.75	0.875	1	1.125	1.25	1.375	1.5	1.75	2	2.25	2.5	2.75	3
		When 10＜L≤16	1	1.125	1.25	1.375	1.5	1.625	1.75	2	2.25	2.5	2.75	3	3.25
		When L＞16	1.5	1.625	1.75	1.875	2	2.125	2.25	2.5	2.75	3	3.25	3.5	3.75
U	max	UNC	0.1	0.111	0.125	0.143	0.154	0.167	0.182	0.2	0.222	0.25	0.286	0.286	0.333
		UNF	0.071	0.083	0.083	0.1	0.1	0.111	0.111	0.125	0.143	0.167	0.167	0.167	0.167
		8UN	–	–	–	–	–	–	–	–	–	–	0.25	0.25	0.25
ds	Full body,max		0.25	0.3125	0.375	0.4375	0.5	0.5625	0.625	0.75	0.875	1	1.125	1.25	1.375
	Full body,min	UNC	0.241	0.303	0.364	0.426	0.488	0.55	0.611	0.735	0.859	0.983	1.106	1.231	1.354
		UNF	0.243	0.304	0.367	0.428	0.491	0.552	0.615	0.739	0.863	0.987	1.112	1.237	1.362
		8UN	–	–	–	–	–	–	–	–	–	–	1.108	1.233	1.358
ds1	Reduced body,max	UNC	0.241	0.303	0.364	0.426	0.488	0.55	0.611	0.735	0.859	0.983	1.106	1.231	1.354
		UNF	0.243	0.304	0.367	0.428	0.491	0.552	0.615	0.739	0.863	0.987	1.112	1.237	1.362
		8UN	–	–	–	–	–	–	–	–	–	–	1.108	1.233	1.358
	Reduced body,min	UNC	0.213	0.271	0.329	0.385	0.444	0.502	0.559	0.677	0.795	0.91	1.023	1.148	1.256
		UNF	0.223	0.281	0.343	0.4	0.462	0.521	0.583	0.703	0.822	0.938	1.063	1.188	1.313
		8UN	–	–	–	–	–	–	–	–	–	–	1.035	1.16	1.284

Connections With Double End Studs

Nominal Diameter (d)		M12	M16	M20	M24	M27	M30	M33	M36	M39	M42	M45
P	Pitch	1.75	2	2.5	3	3	3.5	3.5	4	4	4.5	4.5
ds		8.5	12	15	18	20.5	23	25.5	27.5	30.5	32.5	35.5
d3		8	12	14	14	18	18	25	25	28	28	32
dp		8.5	12	15	18	21	23	26	28	31	33	36
b4		23	27	33	38	43	46	51	54	57	61	64
b5		10	13.5	16.5	20	22.5	25	27.5	30	32.5	35	37.5
L2		19.5	24	30.5	36.5	39	44.5	47	52	54.5	60	62.5
r		10	10	10	16	16	16	16	20	20	20	20
SW		7	10	11	11	13	13	22	22	24	24	27
z1	max	1.75	2	2.5	3	3	3.5	3.5	4	4	4.5	4.5
z2		4	5	6	6	6	6	9	9	10	10	11
z3		4.5	5	7	8	8	9.5	9.5	10.5	10.5	12	12
d4		–	–	–	–	–	–	–	–	–	–	–
d5		–	–	–	–	–	–	–	–	–	–	–
d6		–	–	–	–	–	–	–	–	–	–	–

Nominal Diameter (D)		M48	M52	M56	M64	M72	M80	M90	M100	M110	M120
d
P	Pitch	5	5	5.5	6	6	6	6	6	6	6
ds		37.5	41	44	51	58.5	66	75	84	92.5	102
d3		32	36	40	42	50	50	50	50	50	50
dp		38	42	45	52	60	68	78	88	98	108
b4		67	72	77	88	96	104	115	125	136	147
b5		39.5	43.5	46.5	53.5	60.5	67.5	76.5	85.5	94.5	103.5
L2		67	71	77	86.5	93.5	100.5	109.5	118.5	127.5	136.5
r		20	20	25	25	25	25	25	25	25	32
SW		27	30	32	36	41	41	41	41	41	41
z1	max	5	5	5.5	6	6	6	6	6	6	6
z2		11	12	13	14	15	15	15	15	15	15
z3		13	13	14.5	15.5	15.5	15.5	15.5	15.5	15.5	15.5
d4		–	–	–	18	25	25	25	25	25	25
d5		–	–	–	25	32	32	32	32	32	32
d6		–	–	–	30	37	37	37	37	37	37

DIN 835 – 2010 Studs – Metal End

Screw Thread(d)		M4	M5	M6	M7	M8	M10	M12	M14	M16	M18	M20	M22	M24
P	Coarse thread	0.7	0.8	1	1	1.25	1.5	1.75	2	2	2.5	2.5	2.5	3
	Fine thread	/	/	/	/	1	1.25	1.25	1.5	1.5	1.5	1.5	1.5	2
	Fine thread	/	/	/	/	/	/	1.5	/	/	/	/	/	/
b1		8	10	12	14	16	20	24	28	32	36	40	44	48
b	L≤125	14	16	18	20	22	26	30	34	38	42	46	50	54
	125＜L≤200	20	22	24	26	28	32	36	40	44	48	52	56	60
	L＞200	/	/	/	/	/	45	49	53	57	61	65	69	73
ds	max	4	5	6	7	8	10	12	14	16	18	20	22	24
	min	3.82	4.82	5.82	6.78	7.78	9.78	11.73	13.73	15.73	17.73	19.67	21.67	23.67
x		1.75	2	2.5	2.5	3.2	3.8	4.3	5	5	6.3	6.3	6.3	7.5

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