astm A193 grade B8M class 2 AISI Stainless steel Stud Bolts

Astm A 193 grade B8M class 2 Full threaded Stud Bolts are made from Stainless steel, AISI 316 which have been carbide solution treated & strain hardened(cold drawn to increase tensile properties). It is the process of strain hardening that marks the difference between ASTM A193 grade B8m class 2 & class 1 Full threaded Stud bolts. We manufacture these AISI 316 Full threaded Stud Bolts with great precision & Quality.

ASTM A 193 B8M CLASS 2 CHEMICAL PROPERTIES FULL THREADED STUDS

Carbon max	Manganese max	Phosphorus, max	Sulfur, max	Silicon max	Chromium	Nickel	Molybdenum
0.08	2	0.045	0.03	1	16 - 18	10' - 14	2' - 3

ASTM A 193 B8M CLASS 2 MECHANICAL PROPERTIES FULL THREADED STUDS INCH SIZE

Grade	Size	Tensile ksi, min	Yield, ksi, min	Elong, %, min	RA % min	HRC
B8M Class 2	Up to 3/4"	110	95	15	45	MAX 35
	7/8" -1"	100	80	20	45	MAX 35
	1-1/8" - 1-1/4"	95	65	25	45	MAX 35
	1-3/8" - 1-1/2"	90	50	30	45	MAX 35

ASTM A 193 B8M CLASS 2 MECHANICAL PROPERTIES FULL THREADED STUDS METRIC

Grade	Size	Tensile ksi, min	Yield, ksi, min	Elong, %, min	RA % min	HRC
B8M Class 2	M20 and under	760	655	15	45	MAX 35
Metric Size	Over M20 to M24 inclu	690	550	20	45	MAX 35
	Over M24 to M30 inclu	655	450	25	45	MAX 35
	Over M30 to M36 inclu	620	345	30	45	MAX 35

ASTM A 194 B8M NUTS CHEMICAL COMPOSITION
Carbon max	Manganese max	Phosphorus, max	Sulfur, max	Silicon max	Chromium	Nickel	Molybdenum
0.08	2	0.045	0.03	1	16 - 18	10' - 14	2' - 3

ASTM A 194 B8M NUTS Proof Load Using Threaded Mandrel-lbf— Inch Series
Nominal Size, in.	Threads per inch	Stress area in2	Heavy Hex	Hex
1/4"	20	0.0316	2540	2380
5/16"	18	0.0524	4190	3930
3/8"	16	0.0774	6200	5810
7/16"	14	0.1063	8500	7970
1/2"	13	0.1419	11350	10640
9/16"	12	0.182	14560	13650
5/8"	11	0.226	18080	16950
3/4"	10	0.334	26720	25050
7/8"	9	0.462	36960	34650
1"	8	0.606	48480	45450
11/8"	8	0.79	63200	59250
11/4"	8	1	80000	75000
13/8"	8	1.233	98640	92450
11/2"	8	1.492	119360	111900

ASTM A 194 B8M NUTS Proof Load Using Threaded Mandrel-kN— METRIC
Nominal Size, in.	Thread Pitch	Stress area in2	Heavy Hex	Hex
"
M6"	1	20.1	11.1	10.4
M8	1.25	36.6	20.1	18.8
M10	1.5	58	31.9	29.9
M12	1.75	84.3	46.4	43.4
M14	2	115	63.3	59.2
M16	2	157	86.4	80.9
M20	2.5	245	134.8	126.2
M22	2.5	303	166.7	156
M24	3	353	194.2	181.8
M27	3	459	252.5	236.4
M30	3.5	561	308.6	288.9
M36	4	817	449.4	420.8

What is Strain Hardening? AISI Stainless steel strain-hardened relates to the alloys of stainless steel that were plastically deformed by low temperature cold forming. The mechanical deformation results in decreased cross-sectional region, increased strength and decreased ductility. The strain hardening method does not change the chemical properties, however, and the resulting stronger AISI stainless steel maintains its elevated corrosion.

Strain hardening parts, such as AISI stainless steel bolts, are produced through a cold drawing method that decreases the required size of the over-sized rods or bars. A compression system draws down the steel material with a greater diameter than the one required for the finished item. The mechanism places the material under a higher tension and stress ; this strain decreases the diameter while improving the material's endurance.

Strain hardening is done to prevent the problem of galling between the thread of nuts and the stud or bolts. Galling is a form of wear caused by adhesion between sliding surfaces. When a material galls, some of it is pulled with the contacting surface.< br>

INDANA STEEL manufacturers the best astm astm A193 grade B8M class 2 Bolts through our strong quality system and superior threading mechanism. The following process is involved:

Stainless steel AISI 316 rods are directly rolled by rolling mills on our order.

These rods are chemically tested for composition.

The raw material are further examined for presence of blowholes and internal cracks.

Once the material is approved, the undergo our proprietary mechanism of strain hardening. This is the most critical process in grade B8 M class 2 Stud Bolts.

The material is then cut into the required sizes and stamped according the the prescribed ASTM.

The un-threaded threaded stud bolts are then roll threaded. This is again a cold mechanical process which enhances the strain hardening of the astm A193 grade B8M class 2 Stud Bolts. 

The ASTM A193 grade B8m class 2 Stud Bolts are then quality checked for finish of threads and are verified against there required chemical and mechanical properties.

Lastly the material is paired with their relevant nut i.e.  A194 Grade B8M Hex and heavy hex nuts for depending on metric or imperial sizes.

INDANA is a pioneer in stud bolt production and has been manufacturing the same since 34 years. We have only one principle and that is quality. Quality of product and quality of services. In the industry, INDANA AISI STUD BOLTS are known for the quality and readability. You can sen us your inquires on info@indanasteel.com

Why do we roll thread our bolts?

Thread rolling is the preferred technique of generating powerful, smooth, accurate and uniform internal thread patterns. Thread rolling is a process of cold forging that can be carried out on any ductile metal. Other mechanisms for thread formation on stud bolts and hex bolts invloves removing material to generate the shape of the thread, but the rolling of the thread displaces the material with hard steel dies. The outcome of dies pushing the surface atoms into the shape of the thread instead of weakening it by removing material is that the grains become denser in the critical areas of the thread, particularly in the root and on the flank below the diameter of the pitch of the stud bolts. The rubbing action of the steel dies also generates an outstanding micro-finish (better than Ra32). The superior finish enhances assembly between external and internal threads and decreases wear among mating parts, thus expanding their lives. A smooth finish is another advantage that roll threaded components have over other threaded components.