stainless steel pipes, stainless steel tubes, steel flanges, steel butt weldings, steel pipe fittings
A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts
A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts
A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts
A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts
A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts
A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts
  Ferrous Steels
  Non Ferrous Steels
  Others

A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts

A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts
  A194 / A194M    


Ferrous Steels

A194 / A194M CARBON STEEL AND ALLOY STEEL NUTS FOR BOLTS FOR HIGH TEMPERATURE AND HIGH PRESSURE SERVICE, SQUARE AND HEX HEAD NUTS, AUSTENITIC AND FERRITIC GRADES, GEADE 1,2,2H,2HM,4,3,6,6F,7,7M,8,8AM8C,8CA,8M,8MA,8T,8LN, PROOF LOAD, CARBIDE SOLUTION TREATED, STRAIN  HARDENING.

Scope

ASTM A193 is the standard specification for alloy-steel and stainless steel bolts used in high-temperature or high-pressure environments or other special-purpose applications.  ASTM A194 is the standard specification for carbon and alloy steel nuts for bolts used in equivalent high-pressure or high-temperature environments. ASTM A193 and A194 bolts and nuts from Glaser and Associates are available in a range of grades, including B7, B16 B8 and B8M to meet different design, service conditions, mechanical properties, and high temperature requirements. ASTM A194 also covers the American Association State Highway and Transportation Officials Standard AASHTO M-292.

These bolts and nuts are designed, manufactured and tested to comply with the standards set by ASTM A193 and A194 for chemical composition, tensile and hardness properties and high temperature characteristics.

Grades

Grade

Material

B7

Alloy steel, AISI 4140/4142 quenched and tempered

B16

Alloy steel, Chromium-molybdenum-vanadium heat treated

B8

Class 1 Stainless steel, AISI 304, carbide solution treated

B8M

Class 1 Stainless steel, AISI 316, carbide solution treated

B8

Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened

B8M

Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened

B7, B8 and B8M are the most commonly used grades. The properties tables below provide more information on the differences between the grades.

Applications

The high-temperature, high-pressure performance of these bolts and nuts make them suitable for applications in process industries, such as petroleum and chemicals where they are widely used in pressure vessels, valves, flanges, and fittings.

Properties

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

 

Up to 2-1/2

125

105

18

50

B16

2-5/8 - 4

110

95

17

45

 

4-1/8 - 7

100

85

16

45

B8 Class 1

All

75

30

30

50

B8M Class 1

All

75

30

30

50

B8 Class 2

Up to 3/4

125

100

12

35

7/8 - 1

115

80

15

35

1-1/8 - 1-1/4

105

65

20

35

1-3/8 - 1-1/2

100

50

28

45

B8M Class 2

Up to 3/4

110

95

15

45

7/8 - 1

100

80

20

45

1-1/8 - 1-1/4

95

65

25

45

1-3/8 - 1-1/2

90

50

30

45

Element

B7

B8

B8M

Carbon

0.37 - 0.49%

0.08% max

0.08% max

Manganese

0.65 - 1.10%

2.00% max

2.00% max

Phosphorus, max

0.035%

0.045%

0.045%

Sulfur, max

0.040%

0.030%

0.030%

Silicon

0.15 - 0.35%

1.00% max

1.00% max

Chromium

0.75 - 1.20%

18.0 - 20.0%

16.0 - 18.0%

Nickel

8.0 - 11.0%

10.0 - 14.0%

Molybdenum

0.15 - 0.25%

2.00 - 3.00%

ASTM A194

A194 is a ASTM International specification for nuts

A194 covers a variety of carbon, alloy and stainless steel nuts in sizes 1/4" through 4", M6 through M100 nominal in metric. Nuts of this specification are intended for high-pressure or high-temperature use, or both.

A194 GRADES

A194 Grade 2:

Carbon steel heavy hex nuts.

A194 Grade 2H:

Quenched and tempered carbon steel heavy hex nuts.

A194 Grade 7:

Quenched and tempered alloy steel heavy hex nuts.

A194 Grade 7L:

Quenched and tempered alloy steel heavy hex nuts, Charpy impact tested.

A194 Grade 8:

Stainless AISI 304 heavy hex nuts.

A194 Grade 8M:

Stainless AISI 316 heavy hex nuts.

A194 MECHANICAL PROPERTIES

Grade Marking Size Tempering Temp.
Farenheit
Proof Load Stress, ksi Hardness Brinell
Min Max
2 2 1/4" - 4" 0 150 159 352
2H 2H 1/4" - 1-1/2" 850 175 248 327
2H 2H 1-1/2" - 4" 850 175 212 327
7 7 1/4" - 4" 1100 175 248 327
8 8 1/4" - 4" - 80 126 300
8M 8M 1/4" - 4" - 80 126 300

Notes:

  1. The markings shown for all grades of A194 nuts are for cold-formed and hot-forged nuts. When nuts are machined from bar stock, the nut must additionally be marked with the letter B. The letters H & M indicate heat-treated nuts.
  2. Properties shown are those of coarse and 8-pitch thread heavy hex nuts. 

A194 CHEMICAL PROPERTIES

Element 2, 2H 7 8 (AISI 304) 8M (AISI 316)
Carbon 0.4% min 0.37 - 0.49% 0.08% max 0.08% max
Manganese 1.0% max 0.65 - 1.1% 2.0% max 2.0% max
Phosphorus, max 0.04% 0.035% 0.045% 0.045%
Sulfur, max 0.05% 0.04% 0.03% 0.03%
Silicon 0.40% max 0.15 - 035% 1.0% max 1.0% max
Chromium 0.75 - 1.2% 18.0 - 20.0% 16.0 - 18.0%
Nickel 8.0 - 11.0% 10.0 - 14.0%
Molybdenum 0.15 - 0.25% 2.0 - 3.0%

HEX NUT DIMENSIONS

Nut Size Heavy Hex Nut Heavy Hex Jam Nut
A B A C
1/4" 1/2 15/64 1/2 11/64
5/16" 9/16 19/64 9/16 13/64
3/8" 11/16 23/64 11/16 15/64
7/16" 3/4 27/64 3/4 17/64
1/2" 7/8 31/64 7/8 19/64
9/16" 15/16 35/64 15/16 21/64
5/8" 1-1/6 39/64 1-1/16 23/64
3/4" 1-1/4 47/64 1-1/4 27/64
7/8" 1-7/16 55/64 1-7/16 31/64
1" 1-5/8 63/64 1-5/8 35/64
1-1/8" 1-13/16 1-7/64 1-13/16 39/64
1-1/4" 2 1-7/32 2 23/32
1-3/8" 2-3/16 1-11/32 2-3/16 25/32
1-1/2" 2-3/8 1-15/32 2-3/8 27/32
1-5/8" 2-9/16 1-19/32 2-9/16 29/32
1-3/4" 2-3/4 1-23/32 2-3/4 31/32
1-7/8" 2-15/16 1-27/32 2-15/16 1-1/32
2" 3-1/8 1-31/32 3-1/8 1-3/32
2-1/4" 3-1/2 2-13/64 3-1/2 1-13/64
2-1/2" 3-7/8 2-29/64 3-7/8 1-29/64
2-3/4" 4-1/4 2-45/64 4-1/4 1-37/64
3" 4-5/8 2-61/64 4-5/8 1-45/64
3-1/4" 5 3-3/16 5 1-13/16
3-1/2" 5-3/8 3-7/16 5-3/8 1-15/16
3-3/4" 5-3/4 3-11/16 5-3/4 2-1/16
4" 6-1/8 3-15/16 6-1/8 2-3/16

THREAD DIMENSIONS & OVERSIZING ALLOWANCES

FOR HOT-DIPPED GALVANIZED NUTS
Size & Thread Pitch Diametral Allowance Pitch Diameter
min max
1/4"-20 0.016 0.2335 0.2384
5/16"-18 0.017 0.2934 0.2987
3/8"-16 0.017 0.3514 0.3571
7/16"-14 0.018 0.4091 0.4152
1/2"-13 0.018 0.4680 0.4745
9/16"-12 0.020 0.5284 0.5352
5/8"-11 0.020 0.5860 0.5932
3/4"-10 0.020 0.7050 0.7127
7/8"-9 0.022 0.8248 0.8330
1"-8 0.024 0.9428 0.9516
1-1/8"-8 0.024 1.0678 1.0768
1-1/8"-7 0.024 1.0562 1.0656
1-1/4"-8 0.024 1.1928 1.2020
1-1/4"-7 0.024 1.1812 1.1908
1-3/8"-8 0.027 1.3208 1.3301
1-3/8"-6 0.027 1.2937 1.3041
1-1/2"-8 0.027 1.4458 1.4553
1-1/2"-6 0.027 1.4187 1.4292
1-3/4"-5 0.050 1.6701 1.6817
2"-4.5 0.050 1.9057 1.9181
2-1/4"-4.5 0.050 2.1557 2.1683
2-1/2"-4 0.050 2.3876 2.4011
2-3/4"-4 0.050 2.6376 2.6513
3"-4 0.050 2.8876 2.9015
3-1/4"-4 0.050 3.1376 3.1517
3-1/2"-4 0.050 3.3876 3.4019
3-3/4"-4 0.050 3.6376 3.6521
4"-4 0.050 3.8876 3.9023

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A194 / A194M Carbon Steel Bolts, Alloy Steel Nuts Bolts
   

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