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3 1/2 inch length Square Head Bolts

Square Head Bolts were once the most common form of bolt, until they were replaced by hex head bolts. They are covered under ANSI Standard B18.2.1 and are now most commonly used for aesthetic purposes to provide a rustic look .

112 results, (click on any line for more information)

Buy Square Head Bolts from one of our FCH Network Members
Supplier	Loc	Type	Material	Finish	Size	Description	Qty
Hayes	CA	Square Head Bolt	Steel	Zinc/Clear	1/2-13 x 3 1/2	1/2-13 x 3 1/2 square hd bolt zinc	46	Contact_Supplier
Hayes	CA	Square Head Bolt	Steel	Galvanized	1/2-13 x 3 1/2	1/2-13 x 3 1/2 square hd bolt hdg	5	Contact_Supplier
YANKEE	NH	Square Head Bolt	Steel	Plain	1/2-13 x 3 1/2	1/2-13 x 3 1/2 square hd bolt	120	Contact_Supplier
YANKEE	NH	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	3/4-10 x 3 1/2 square hd bolt	17	Contact_Supplier
MESAFAST	CA	Square Head Bolt	Steel	Plain	5/8-11 x 3 1/2	square hd bolt 307	75.0	Contact_Supplier
Endries	WI	Square Head Bolt	300 Stainless (A1,A2, 18-8,304,310 etc.)	Plain	5/8-11 x 3 1/2	5/8-11x3-1/2 18-8 stainless steel square head machine bolt	6	Contact_Supplier
Jackson	MS	Square Head Bolt	Grade 2	Plain	3/4-10 x 3 1/2	square bolt gr. 2	2	Contact_Supplier
Jackson	MS	Square Head Bolt	Grade 5	Plain	1/2-13 x 3 1/2	square	2	Contact_Supplier
Jackson	MS	Square Head Bolt	Grade 5	Plain	1-8 x 3 1/2	square	25	Contact_Supplier
Jackson	MS	Square Head Bolt	Grade 8	Plain	3/4-10 x 3 1/2	square bolt gr. 8	2	Contact_Supplier
Weaver	WA	Square Head Bolt	Grade 5	Plain	5/8-11 x 3 1/2	5/8-11x3 1/2 gr5 square hd bolt plain	14	Contact_Supplier
METRO IND	OH	Square Head Bolt	Steel	Plain	1/2-13 x 3 1/2	square hd bolt	8	Contact_Supplier
METRO IND	OH	Square Head Bolt	Grade 5	Plain	1/2-13 x 3 1/2	square hd bolt	25	Contact_Supplier
Jackson	MS	Square Head Bolt	Grade 5	Plain	3/4-10 x 3 1/2	square	27	Contact_Supplier
Jackson	MS	Square Head Bolt	Grade 2	Zinc/Clear	3/4-10 x 3 1/2	nc sq bolt	366	Contact_Supplier
SWACO	OH	Square Head Bolt	Grade A	Plain	3/4-10 x 3 1/2	3/4-10x3 1/2 a307 gr a sq hd bolt p	20	Contact_Supplier
SWACO	OH	Square Head Bolt	Grade A	Plain	1/2-13 x 3 1/2	1/2-13x3 1/2 a307 gr a square hd bolt p	7	Contact_Supplier
SWACO	OH	Square Head Bolt	Grade A	Plain	5/16-18 x 3 1/2	5/16-18x3 1/2 a307 gr a square hd bolt	320	Contact_Supplier
CIF	IL	Square Head Bolt	Grade 2	Plain	1-8 x 3 1/2	1-8 x 3 1/2 square head machine bolt grade 2 plain	58	Contact_Supplier
CIF	IL	Square Head Bolt	Grade 5	Plain	3/4 x 3 1/2	3/4 x 3 1/2 square head blank grade 5 plain	840	Contact_Supplier
CIF	IL	Square Head Bolt	Grade 5	Plain	3/4-10 x 3 1/2	3/4-10 x 3 1/2 square head machine bolt grade 5 plain	1043	Contact_Supplier
CIF	IL	Square Head Bolt	300 Stainless (A1,A2, 18-8,304,310 etc.)	Plain	1-8 x 3 1/2	1-8 x 3 1/2 square head machine bolt 18-8 stainless steel	3	Contact_Supplier
R&S Indus	OR	Square Head Bolt	Grade A	Plain	3/8-16 x 3 1/2	3/8-16x3 1/2 (pt) a307 grade a square head bolt plain	370	Contact_Supplier
R&S Indus	OR	Square Head Bolt	Grade A	Plain	3/4-10 x 3 1/2	3/4-10x3 1/2 (pt) a307 grade a square head bolt plain	2	Contact_Supplier
ACCURATE	IL	Square Head Bolt	Steel	Plain	3/8-16 x 3 1/2	3/8-16x3 1/2 bolt square machine plain	300	Contact_Supplier
ACCURATE	IL	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	bolt square machine	6	Contact_Supplier
BHAM	AL	Square Head Bolt	Steel	Plain	5/8-11 x 3 1/2	5/8-11 x 3 1/2 square head bolt	100	Contact_Supplier
FasSpcMfg	FL	Square Head Bolt	316, 317, A4 Stainless	Plain	1/2-13 x 3 1/2	1/2-13 x 3 1/2 square head bolt 316 stainless	2	Contact_Supplier
FasSpcMfg	FL	Square Head Bolt	316, 317, A4 Stainless	Plain	1/2-13 x 3 1/2	1/2-13 x 3 1/2 square head bolt 316 stainless	2	Contact_Supplier
OneMonroe	NC	Square Head Bolt	Grade A	Plain	5/8-11 x 3 1/2	5/8-11 x 3 1/2 a307a plain finish square head bolt	74	Contact_Supplier
OneMonroe	NC	Square Head Bolt	Grade 2	Plain	1/2-13 x 3 1/2	1/2-13 x 3-1/2 sq hd gr2 pln. bolt	25	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 8	Plain	1/2-13 x 3 1/2	1/2-13 x 3 1/2 \| square head bolt grade 8	171	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 2	Plain	7/8-9 x 3 1/2	7/8-9 x 3 1/2 \| square head bolt grade 2	28	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Steel	Galvanized	5/8-11 x 3 1/2	5/8-11 x 3 1/2 \| hdg sq mach bolt	94	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 2	Plain	5/8-11 x 3 1/2	5/8-11 x 3 1/2 \| square head bolt grade 2	4	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 2	Plain	7/8-9 x 3 1/2	7/8-9 x 3 1/2 \| square head bolt grade 2	6	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 2	Plain	5/8-11 x 3 1/2	5/8-11 x 3 1/2 \| square head bolt grade 2	13	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 8	Plain	1/2-13 x 3 1/2	1/2-13 x 3 1/2 \| square head bolt grade 8	183	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 2	Plain	1/4-20 x 3 1/2	square bolt	4084	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 2	Plain	3/8-16 x 3 1/2	square bolt	69	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 2	Plain	1/2-13 x 3 1/2	square bolt	28	Contact_Supplier
Alma Bolt	MI	Square Head Bolt	Grade 2	Plain	3/4-10 x 3 1/2	square bolt	4	Contact_Supplier
OneMonroe	MA	Square Head Bolt	Grade 2	Plain	1/2-13 x 3 1/2	1/2-13 x 3-1/2 sq hd gr2 pln. bolt	25	Contact_Supplier
Liberty	IL	Square Head Bolt	Steel	Zinc/Clear	3/8-16 x 3 1/2	square m/b 1 tl poor m/b 1 tl poor	840	Contact_Supplier
Liberty	IL	Square Head Bolt	Steel	Zinc/Clear	3/8-16 x 3 1/2	square m/b f/t	559	Contact_Supplier
Liberty	IL	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	square m/b machine bolt	25	Contact_Supplier
Liberty	IL	Square Head Bolt	Steel	Zinc/Clear	3/8-16 x 3 1/2	square m/b machine bolt	449	Contact_Supplier
Liberty	IL	Square Head Bolt	300 Stainless (A1,A2, 18-8,304,310 etc.)	Plain	5/8-11 x 3 1/2	square m/b 18-8s/s m/b 18-8s/s	23	Contact_Supplier
Liberty	IL	Square Head Bolt	Grade 5	Plain	7/8-9 x 3 1/2	square m/b machine bolt	18	Contact_Supplier
Liberty	IL	Square Head Bolt	Steel	Plain	5/16-18 x 3 1/2	square hd m/b 7/8 tl 7/8 tl	500	Contact_Supplier
Liberty	IL	Square Head Bolt	Steel	Zinc/Yellow	1-8 x 3 1/2	square m/b & machine bolt &	50	Contact_Supplier
Liberty	IL	Square Head Bolt	Steel	Zinc/Yellow	3/8-16 x 3 1/2	square m/b & machine bolt &	100	Contact_Supplier
Liberty	IL	Square Head Bolt	316, 317, A4 Stainless	Plain	3/4-10 x 3 1/2	square m/b 316 stainless	10	Contact_Supplier
American	WI	Square Head Bolt	Steel	Plain	5/8-11 x 3 1/2	5/8-11x3-1/2 nc square hd mach bolt	128	Contact_Supplier
American	WI	Square Head Bolt	300 Stainless (A1,A2, 18-8,304,310 etc.)	Plain	1-8 x 3 1/2	1-8x3-1/2 nc square hd mach bolt #304 ss	24	Contact_Supplier
Future Fastener	TX	Square Head Bolt	Steel	Galvanized	3/8-16 x 3 1/2	3/8-16 x 3 1/2 sq hd machine bolt galv.	100	Contact_Supplier
Longhorn	TX	Square Head Bolt	Grade 5	Plain	5/8-11 x 3 1/2	5/8-11 x 3-1/2 square hd bolt gr 5	98	Contact_Supplier
American	NY	Square Head Bolt	Steel	Plain	3/8-16 x 3 1/2	square bolt	150	Contact_Supplier
American	NY	Square Head Bolt	Steel	Zinc/Clear	1/2-13 x 3 1/2	square m/b zp	50	Contact_Supplier
American	NY	Square Head Bolt	Grade 5	Plain	5/8-18 x 3 1/2	square m/b	300	Contact_Supplier
BIG BOLT	IL	Square Head Bolt	300 Stainless (A1,A2, 18-8,304,310 etc.)	Plain	5/16-18 x 3 1/2	bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1	1000	Contact_Supplier
BIG BOLT	IL	Square Head Bolt	Grade 8	Plain	7/16-14 x 3 1/2	bolt & c/s square boltsquare b18.2.1	1000	Contact_Supplier
BIG BOLT	IL	Square Head Bolt	Grade 5	Plain	5/8-11 x 3 1/2	bolt & c/s square boltsquare b18.2.1	1318	Contact_Supplier
BIG BOLT	IL	Square Head Bolt	Grade 8	Plain	7/16-20 x 3 1/2	bolt & c/s square boltsquare b18.2.1	1000	Contact_Supplier
BIG BOLT	IL	Square Head Bolt	300 Stainless (A1,A2, 18-8,304,310 etc.)	Plain	5/8-11 x 3 1/2	bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1	500	Contact_Supplier
Komar	IL	Square Head Bolt	Steel	Zinc/Clear	3/8-16 x 3 1/2	3/8-16x3 1/2 square hd machine bolt zinc	1100	Contact_Supplier
XL Screw	GA	Square Head Bolt	Steel	Plain	1/2-13 x 3 1/2	square m/b std thrd fsb astm a307	210	Contact_Supplier
XL Screw	GA	Square Head Bolt	Steel	Plain	3/8-16 x 3 1/2	square m/b std thrd fsb astm a307	300	Contact_Supplier
XL Screw	GA	Square Head Bolt	Steel	Plain	5/8-11 x 3 1/2	square m/b std thrd fsb astm a307	120	Contact_Supplier
XL Screw	GA	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	square m/b std thrd fsb astm a307	80	Contact_Supplier
XL Screw	GA	Square Head Bolt	Steel	Plain	1-8 x 3 1/2	square m/b std thrd fsb astm a307	40	Contact_Supplier
XL Screw	GA	Square Head Bolt	Steel	Zinc/Clear	5/8-11 x 3 1/2	square hd m/b std thrd fsb astm a307 zp	120	Contact_Supplier
XL Screw	GA	Square Head Bolt	Steel	Zinc/Clear	3/4-10 x 3 1/2	square hd m/b std thrd fsb astm a307 zp	80	Contact_Supplier
IPC	VA	Square Head Bolt	Grade A	Zinc/Yellow	3/4-10 x 3 1/2	3/4-10x3 1/2 square hd mach bolt a307 steel zinc yellow	975	Contact_Supplier
Delta	TX	Square Head Bolt	Steel	Plain	7/8-9 x 3 1/2	square hd bolt plain 7/8-9x3 1/2	55	Contact_Supplier
ISSCO	MO	Square Head Bolt	Grade 5	Zinc/Clear	3/4-10 x 3 1/2		926	Contact_Supplier
ISSCO	MO	Square Head Bolt	Grade 2	Plain	3/8-16 x 3 1/2		1600	Contact_Supplier
Cascade	OR	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	square m/b b18.2.1	57	Contact_Supplier
SIS	AZ	Square Head Bolt	Steel	Zinc/Yellow	3/8-16 x 3 1/2	3/8-16x3-1/2 square head machine bolt steel zinc yellow per spec tt-5	129600	Contact_Supplier
B & K FAST	PA	Square Head Bolt	Steel	Plain	1/2-13 x 3 1/2	1/2-13 x 3 1/2 square bolts plain b18.2.1	8	Contact_Supplier
B & K FAST	PA	Square Head Bolt	Steel	Plain	7/8-9 x 3 1/2	7/8-9 x 3 1/2 square bolts plain b18.2.1	523	Contact_Supplier
B & K FAST	PA	Square Head Bolt	Grade 8	Plain	1-8 x 3 1/2	1-8 x 3 1/2 square bolts gr 8 plain b18.2.1	2	Contact_Supplier
B & K FAST	PA	Square Head Bolt	Steel	Plain	1-8 x 3 1/2	1-8 x 3 1/2 square bolts plain b18.2.1	305	Contact_Supplier
B & K FAST	PA	Square Head Bolt	Steel	Plain	5/8-11 x 3 1/2	5/8-11 x 3 1/2 square bolts plain b18.2.1	323	Contact_Supplier
Kanebridge	IL	Square Head Bolt	Steel	Plain	3/8-16 x 3 1/2	3/8-16x3 1/2 square machine bolt plain	5,000	Contact_Supplier
Kanebridge	IL	Square Head Bolt	Steel	Plain	1/2-13 x 3 1/2	1/2-13x3 1/2 square machine bolt plain	2.500	Contact_Supplier
Kanebridge	IL	Square Head Bolt	Steel	Plain	5/8-11 x 3 1/2	5/8-11x3 1/2 square machine bolt plain	1.875	Contact_Supplier
Kanebridge	IL	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	3/4-10x3 1/2 square machine bolt plain	1.500	Contact_Supplier
Kanebridge	IL	Square Head Bolt	Steel	Plain	7/8-9 x 3 1/2	7/8-9x3 1/2 square machine bolt plain	0.750	Contact_Supplier
BHAM	AL	Square Head Bolt	Steel	Zinc/Clear	1/2-13 x 3 1/2	square hd mach bolt zn	40	Contact_Supplier
Lippin	CA	Square Head Bolt	Steel	Zinc/Clear	1/2-13 x 3 1/2	square head bolt zinc plated	165	Contact_Supplier
Lippin	CA	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	square head bolt plain	44	Contact_Supplier
BAYFASTCO	FL	Square Head Bolt	Steel	Plain	1/2-13 x 3 1/2	1/2-13 x 3 1/2 square head bolt	100	Contact_Supplier
SRF	AL	Square Head Bolt	Grade 2	Plain	5/16-18 x 3 1/2	square hd bolt	-	Contact_Supplier
SRF	AL	Square Head Bolt	Grade 2	Plain	3/8-16 x 3 1/2	square hd bolt	38	Contact_Supplier
ASFCORP	MI	Square Head Bolt	Grade A	Zinc/Clear	3/8-16 x 3 1/2	3/8-16 x 3 1/2 sq hd blt a307 gr a tri zn fe/zn 5an	340	Contact_Supplier
THRDFAST	FL	Square Head Bolt	Steel	Plain	1/2-13 x 3 1/2	square hd bolt b18.2.1	145	Contact_Supplier
THRDFAST	FL	Square Head Bolt	Steel	Plain	1/2-13 x 3 1/2	square hd bolt b18.2.1	8	Contact_Supplier
KBS	TN	Square Head Bolt	Grade 8	Plain	1-8 x 3 1/2	1-8 x 3 1/2 square mach bolt gr-8 b18.2.1	20	Contact_Supplier
KBS	TN	Square Head Bolt	Grade 5	Plain	5/8-11 x 3 1/2	5/8-11 x 3 1/2 square mach.bolt gr-5 b18.2.1	3	Contact_Supplier
KBS	TN	Square Head Bolt	Grade 8	Plain	3/4-10 x 3 1/2	3/4-10 x 3 1/2 square mach bolt gr-8 b18.2.1	89	Contact_Supplier
FMP	MA	Square Head Bolt	Steel	Plain	1/4-20 x 3 1/2	square bolt	750	Contact_Supplier
FMP	MA	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	square bolt	1100	Contact_Supplier
Valley Nu	WA	Square Head Bolt	Steel	Plain	1/4-20 x 3 1/2	nc square bolt pl	11	Contact_Supplier
Valley Nu	WA	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	nc square hd bolt	5	Contact_Supplier
ACCURATE	IL	Square Head Bolt	Steel	Zinc/Clear	5/16-18 x 3 1/2	square m/b	5,000	Contact_Supplier
ACCURATE	IL	Square Head Bolt	Steel	Zinc/Clear	3/8-16 x 3 1/2	square fulthr m/b	1,750	Contact_Supplier
ACCURATE	IL	Square Head Bolt	Steel	Zinc/Clear	5/8-11 x 3 1/2	square m/b	1,100	Contact_Supplier
ACCURATE	IL	Square Head Bolt	Steel	Plain	3/4-10 x 3 1/2	square m/b	200	Contact_Supplier
ACCURATE	IL	Square Head Bolt	Steel	Zinc/Clear	1/4-20 x 3 1/2	square m/b	600	Contact_Supplier
ACCURATE	IL	Square Head Bolt	Steel	Plain	7/8-9 x 3 1/2	square m/b	142	Contact_Supplier
QFS	MI	Square Head Bolt	300 Stainless (A1,A2, 18-8,304,310 etc.)	Plain	1/2-13 x 3 1/2	Square head set screw cup point STAINLESS STEEL	175	Contact_Supplier

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