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DIN Stainless Steel Threaded Rod B7 B8 Fully Threaded Stud Bolt

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DIN Stainless Steel Threaded Rod B7 B8 Fully Threaded Stud Bolt

Country/Region	china
City & Province	zhejiang
Categories	Bolts

Product Details

B7 B8 Threaded Bar Threaded Rod Stainless Steel Fully Threaded Stud Bolt

ASTM A193 Grade B7 specification covers requirements for high tensile alloy steel bolting material for use in high temperature or high-pressure service and other special purpose applications. It is a standard specification defining typical chemical composition, mechanical properties, hardness requirement, preferential heat treatment, product marking, certification and other requirements, suitable for bolting used in pressure vessel service, valves, flanges and fittings. ASTM A193 defines both SI (Metric) and inch-pound units.

Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC. Boltport uses Alloy Steel AISI 4140 bar stock or forging stock to produce B7 headed and non-headed bolts. A193 Grade B7 is the most commonly used Bolt specification coupled with A194 Grade 2H Nuts for Bolting Carbon Steel pipeline. A193 B7 bolting is available in metric sizes from M6 to M180 and imperial sizes from 1/4 to 7 inches, in diameter.

Find information on ASTM A193 Grade B7 chemical composition, mechanical properties such as tensile strength; yield strength, hardness, marking requirements and reference product standards.

ASTM A193 Grade B7 Chemical Composition

Elements	Range	Product Variation, Over or Under B
Carbon	0.37-0.49 % D	0.02 %
Manganese, max	0.65-1.10 %	0.04 %
Phosphorus, max	0.035 %	0.005 % over
Sulfur, max	0.040 %	0.005 % over
Silicon	0.15 - 0.35 %	0.02 %
Chromium	0.75-1.20 %	0.05 %
Molybdenum	0.15-0.25 %	0.02 %

Product analysis - Individual determinations sometimes vary from the specified limits on ranges as shown in the tables. The several determinations of any individual element in a heat may not vary both above and below the specified range.

For bar sizes over 31/2 in. [90 mm], inclusive, the carbon content may be 0.50 %, max. For the B7M grade, a minimum carbon content of 0.28 % is permitted, provided that the required tensile properties are met in the section sizes involved; the use of AISI 4130 or 4130H is allowed.

Screw Thread
d

d
PP	UNC
	UNF
	8UN
u	max	UNC
		UNF
		8UN

0.2500	0.3125	0.3750	0.4375	0.5000	0.5625	0.6250	0.7500	0.8750	1.0000	1.1250	1.2500	1.3750
20	18	16	14	13	12	11	10	9	8	7	7	6
28	24	24	20	20	18	18	16	14	12	12	12	12
-	-	-	-	-	-	-	-	-	-	8	8	8
0.100	0.111	0.125	0.143	0.154	0.167	0.182	0.200	0.222	0.250	0.286	0.286	0.333
0.071	0.083	0.083	0.100	0.100	0.111	0.111	0.125	0.143	0.167	0.167	0.167	0.167
-	-	-	-	-	-	-	-	-	-	0.250	0.250	0.250

Screw Thread
d

d
PP	UNC
	UNF
	8UN
u	max	UNC
		UNF
		8UN

1.5000	1.6250	1.7500	1.8750	2.0000	2.2500	2.5000	2.7500	3.0000	3.2500	3.5000	3.7500	4.0000
6	-	5	-	4-1/2	4-1/2	4	4	4	4	4	4	4
12	-	-	-	-	-	-	-	-	-	-	-	-
8	8	8	8	8	8	8	8	8	8	8	8	8
0.333	-	0.400	-	0.444	0.444	0.500	0.500	0.500	0.500	0.500	0.500	0.500
0.167	-	-	-	-	-	-	-	-	-	-	-	-
0.250	0.250	0.250	0.250	0.250	0.250	0.250	0.250	0.250	0.250	0.250	0.250	0.250