B18.1.1 A193 B7 Alloy Steel PTFE Coating Stud Bolt
ASTM A193 Grade B7 stud bolts are high strength fasteners manufactured from a chromium-molybdenum steel and are quenched and tempered. Dimensional specifications are governed by ASME B18.31.2. Grade markings consists of both the grade symbol "B7" and the manufacturer's identification mark on one end of each stud 3/8" diameter and larger. Manufacturer's marking may be placed on other end if insufficient space. Inch series fasteners meeting ASTM A193 Grade B7 specifications are typically used in flange bolting applications. ASTM A193 covers the requirements for high temperature and high pressure bolting. A193 B7 all thread studs, as well as hex bolts having diameters above 1" are most common in 8UN (8 threads per inch) thread pitch. PTFE coating (commonly referred to as Teflon) is formulated with superior characteristics for maximum fastener life. Technical components include a tensile strength of up to 4,000 psi and an operating pressure up to 100,000 psi. The absence of nut locking oxides enable easy and safe removal. PTFE coatings have extreme chemical resistance and are ideal for applications including insulating piping, boiler rooms, water filled piping, water lines and more.
ASTM A193 B7 Stud Bolts Material Chemical Composition
| Element |
B7 (AISI 4140) |
B8 (AISI 304) |
B8M (AISI 316) |
B16 (AISI 4140) |
| Carbon |
0.37 - 0.49% |
0.08% max |
0.08% max |
0.37 - 0.49% |
| Manganese |
0.65 - 1.10% |
2.00% max |
2.00% max |
0.65 - 1.10% |
| Phosphorus, max |
0.035% |
0.045% |
0.045% |
0.035% |
| Sulfur, max |
0.040% |
0.030% |
0.030% |
0.040% |
| Silicon |
0.15 - 0.35% |
1.00% max |
1.00% max |
0.15 - 0.35% |
| Chromium |
0.75 - 1.20% |
18.0 - 20.0% |
16.0 - 18.0% |
0.75 - 1.20% |
| Nickel |
|
8.0 - 11.0% |
10.0 - 14.0% |
|
| Molybdenum |
0.15 - 0.25% |
|
2.00 - 3.00% |
0.15 - 0.25% |
| Grade |
Size |
Tensile ksi, min |
Yield, ksi, min |
Elong, %, min |
RA % min |
| B7 |
Up to 2-1/2 |
125 |
105 |
16 |
50 |
| 2-5/8 - 4 |
115 |
95 |
16 |
50 |
| 4-1/8 - 7 |
100 |
75 |
18 |
50 |
Diameter:1/4″~3 3/4″
Length:20mm~6000mm(usually 12 feet)
Standard: M6-M100
Material: ASTM A193 B7.
Surface finished: PTFE Xylan Coated.
Standard: ANSI B18.1.1.
Company Profile
From 1989 to now, Kingmetal Steel focus on manufacturing and distributing pipeline products including piping, fitting, flange, valve and fastener in stainless, carbon, alloy and duplex steel.
Kingmetal has a factory to manufacture seamless stainless steel pipe from DN6 to DN600 and distribute seamless steel pipe and fitting from top brand manufacturers such as Baosteel, Hengsteel, Tiansteel and Pansteel etc.
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