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Heavy Hex Screws [Table 7] (ASTM A193 A320)

Designed to withstand elevated temperatures and harsh environments, heavy hex screws from ASTM A193 and A320 exhibit excellent mechanical properties even under extreme heat and pressure conditions. This makes them ideal for use in high-temperature equipment and machinery where ordinary fasteners may fail

Model:ASME B 18.2.1

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Product Description

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Premium Fastening Solutions: Heavy hex screws featured in Table 7 (ASTM A193, A320) offer premium-grade fastening solutions for demanding applications. Engineered from high-strength alloy steel, these screws provide superior tensile strength and resistance to extreme temperatures and pressures, making them suitable for critical bolting applications in industries such as oil and gas, petrochemical, and aerospace.

High-Temperature Performance: Designed to withstand elevated temperatures and harsh environments, heavy hex screws from ASTM A193 and A320 exhibit excellent mechanical properties even under extreme heat and pressure conditions. This makes them ideal for use in high-temperature equipment and machinery where ordinary fasteners may fail.

Corrosion Resistance: With their corrosion-resistant alloy compositions and optional coatings

Screw Thread
d

3/8

1/2

5/8

3/4

7/8

1-1/8

1-1/4

1-3/8

1-1/2

1-5/8

1-3/4

1-7/8

2-1/4

d_s	max
d_s	min
s	max
s	min
e	max
e	min
k	max
k	min
k_w	min
b	L≤6
b	L＞6

0.375	0.500	0.625	0.75	0.875	1	1.125	1.25	1.375	1.5	1.625	1.75	1.875	2	2.25
0.36	0.482	0.605	0.729	0.852	0.976	1.098	1.223	1.345	1.47	1.591	1.716	1.839	1.964	2.214
0.688	0.875	1.062	1.25	1.438	1.625	1.812	2	2.188	2.375	2.562	2.75	2.938	3.125	3.5
0.669	0.850	1.031	1.212	1.394	1.575	1.756	1.938	2.119	2.3	2.481	2.662	2.844	3.025	3.388
0.794	1.01	1.227	1.443	1.66	1.876	2.093	2.309	2.526	2.742	2.959	3.175	3.392	3.608	4.041
0.763	0.969	1.175	1.383	1.589	1.796	2.002	2.209	2.416	2.622	2.829	3.035	3.242	3.449	3.862
0.243	0.323	0.403	0.483	0.563	0.627	0.718	0.813	0.878	0.974	1.038	1.134	1.198	1.263	1.423
0.226	0.302	0.378	0.455	0.531	0.591	0.658	0.749	0.81	0.902	0.962	1.054	1.114	1.175	1.327
0.160	0.215	0.269	0.324	0.378	0.416	0.461	0.530	0.569	0.640	0.694	0.748	0.802	0.825	0.933
1	1.25	1.5	1.75	2	2.25	2.5	2.75	3	3.25	3.5	3.75	4	4.25	-
1.25	1.5	1.75	2	2.25	2.5	2.75	3	3.25	3.5	3.75	4	4.25	4.5	5

Screw Thread
d

2-1/2

2-3/4

3-1/4

3-1/2

3-3/4

4-1/4

4-1/2

4-3/4

5-1/4

5-1/2

5-3/4

d_s	max
d_s	min
s	max
s	min
e	max
e	min
k	max
k	min
k_w	min
b	L≤6
b	L＞6

2.5	2.75	3	3.25	3.5	3.75	4	4.25	4.5	4.75	5	5.25	5.5	5.75	6
2.461	2.711	2.961	3.21	3.461	3.7109	3.9609	4.2228	4.4727	4.7227	4.9726	5.2226	5.4726	5.7225	5.9725
3.875	4.25	4.625	5	5.375	5.75	6.125	6.5	6.875	7.25	7.625	8	8.375	8.75	9.125
3.75	4.112	4.475	4.838	5.2	5.562	5.925	6.288	6.65	7.012	7.375	7.738	8.1	8.462	8.825
4.474	4.907	5.34	5.774	6.207	6.64	7.073	7.506	7.939	8.372	8.805	9.238	9.671	10.104	10.537
4.275	4.688	5.102	5.515	5.928	6.341	6.755	7.168	7.581	7.994	8.408	8.821	9.234	9.647	10.060
1.583	1.744	1.935	2.126	2.256	2.447	2.576	2.768	2.896	3.088	3.217	3.408	3.538	3.729	3.858
1.479	1.632	1.815	1.998	2.12	2.303	2.424	2.608	2.728	2.912	3.033	3.216	3.338	3.521	3.642
1.042	1.151	1.290	1.399	1.484	1.612	1.697	1.826	1.910	2.038	2.123	2.251	2.337	2.465	2.549
-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
5.5	6	6.5	7	7.5	8	8.5	9	9.5	10	10.5	11	11.5	12	12.5