Class5 Zinc Plated Bolts And Nuts ASME ANSI B18 2.1 Bolts Hex Head Cap Screws

Drawing:

Hex bolts
ASME/ANSI B18.2.1-2010
d(ich)	ds(ich)		s(ich)		k(ich)		b(ich)
	min	max	min	max	min	max	L≤6	L>6
1/4	0.237	0.26	0.425	0.438	0.15	0.188	0.75	1
5/16	0.298	0.324	0.484	0.5	0.195	0.235	0.875	1.125
3/8	0.36	0.388	0.544	0.562	0.226	0.268	1	1.25
7/16	0.421	0.452	0.603	0.625	0.272	0.316	1.125	1.375
1/2	0.482	0.515	0.725	0.75	0.302	0.364	1.25	1.5
5/8	0.605	0.642	0.905	0.938	0.378	0.444	1.5	1.75
3/4	0.729	0.768	1.088	1.125	0.455	0.524	1.75	2
7/8	0.852	0.895	1.269	1.312	0.531	0.604	2	2.25
1	0.976	1.022	1.45	1.5	0.591	0.7	2.25	2.5
1-1/8	1.098	1.149	1.631	1.688	0.658	0.78	2.5	2.75
1-1/4	1.223	1.277	1.812	1.875	0.749	0.876	2.75	3
1-3/8	1.345	1.404	1.994	2.062	0.81	0.94	3	3.25
1-1/2	1.47	1.531	2.175	2.25	0.902	1.036	3.25	3.5
1-5/8	1.591	1.658	2.356	2.438	0.978	1.116	3.5	3.75
1-3/4	1.716	1.785	2.538	2.625	1.054	1.196	3.75	4
1-7/8	1.839	1.912	2.719	2.812	1.13	1.276	4	4.25
2	1.964	2.039	2.9	3	1.175	1.388	4.25	4.5
2-1/4	2.214	2.305	3.262	3.375	1.327	1.548	/	5
2-1/2	2.461	2.559	3.625	3.75	1.479	1.708	/	5.5
2-3/4	2.711	2.827	3.988	4.125	1.632	1.869	/	6
3	2.961	3.081	4.35	4.5	1.815	2.06	/	6.5
3-1/4	3.21	3.335	4.712	4.875	1.936	2.251	/	7
3-1/2	3.461	3.589	5.075	5.25	2.057	2.38	/	7.5
3-3/4	3.726	3.858	5.437	5.625	2.241	2.572	/	8
4	3.975	4.111	5.8	6	2.424	2.764	/	8.5

Medium-Strength Grade 5 Steel Hex Head Screws

Made from Grade 5 steel, these screws are suitable for fastening most machinery and equipment. Dimensions meet ASME B18.2.1 specifications. Grade 5 steel hex head screws are marked with three radial lines. Length is measured from under the head.

Black-oxide steel screws are mildly corrosion resistant in dry environments. Zinc-plated steel screws resist corrosion in wet environments. Black ultra-corrosion-resistant-coated steel screws resist chemicals and withstand 1,000 hours of salt spray per ASTM B117. To maintain corrosion resistance, use these screws with black ultra-corrosion-resistant-coated nuts and washers.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.

Screws that meet ASTM A449 or SAE J429 comply with specifications and testing requirements for material quality.

Mechanical Properties: