Identification Markings

Fastener Identification Markings
Grade Identification Marking Specification Material Nominal Size In. Proof Load Stress ksi Tensile Strength Min ksi Hardness Rockwell
Max Min
j429_gr1 SAE J429 – Grade 1 Low or Medium Carbon Steel 1/4 thru 1 1/2 33 60 B70 B100
SAE J429 – Grade 2 1/4 thru 3/4
over 3/4 thru 1 1/2
55
33
74
60
B80
B70
B100
B100
a307a ASTM A307 – Grade A 1/4 thru 4 60 B69 B100
a307b ASTM A307 – Grade B 1/4 thru 4 60 min
100 max
B69 B95
sae_j429_gr5 SAE J429 – Grade 5
ASTM A449 – Type 1
Medium Carbon Steel, Quenched and Tempered 1/4 thru 1
over 1 thru 1 1/2
85
74
120
105
C25
C19
C34
C30
ASTM A449 – Type 1 over 1/2 thru 3 55 90 183 235
j429_gr51 SAE J429 – Grade 5.1 Low or Medium Carbon Steel, Quenched and Tempered No. 6 thru 1/2 85 120 C25 C40
saej429_gr52 SAE J429 – Grade 5.1 Low Carbon Martensite Steel, Quenched and Tempered 1/4 thru 1 85 120 C26 C36
ASTM A449 – Type 2 C25 C34
a325 ASTM A325 – Type 1 Medium Carbon Steel, Quenched and Tempered 1/2 thru 1
over 1 to 1 1/2
85
74
120
105
C24
C19
C35
C31
a325_t3 ASTM A325 – Type 3 Atmospheric Corrosion Resistant Steel, Quenched and Tempered
j429_gr8 SAE J429 Grade 8 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 thru 1 1/2 120 150 C33 C39
a354_bd  ASTM A354 Grade BD 1/4 thru 2 1/2
over 2 1/2 thru 4
120
105
150
140
C33
C31
C39
C39
j429_gr82 SAE J429 Grade 8.2 Low Carbon Martensite Steel, Quenched and Tempered 1/4 thru 1 120 150 C33 C39
a490 ASTM A490 Type 1 Medium Carbon Alloy Steel, Quenched and Tempered 1/2 thru 1 1/2 120 150 min
170 max
C33 C38
a490_t2 ASTM A490 Type 2 Low Carbon Martensite Steel, Quenched and Tempered 1/2 thru 1 120 150 min
170 max
C33 C38
a490_t3 ASTM A490 Type 3 Atmospheric Corrosion Resistant Steel, Quenched and Tempered 1/2 thru 1 1/2 120 150 min
170 max
C33 C38

NOTES :

  1. In addition to the indicated grade marking, all grades included in this table must be marked for manufacturer identification.
  2. While hex heads are shown, grade markings apply equally to products with other head configurations.
  3. Hardnesses Brinell Hardness Numbers.
  4. Grade 5.1 is a popular grade for SEMS.
  5. A325 Type 1 bolts may also be marked with 3 radial lines 120° apart in addition to the A325 marking.
  6. The bolt manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel.
  7. ASTM A354 Grade BD may have optionally six radial lines.
  8. Specifications
  • SAE J429 ― Mechanical end Material Requirements for Externally Threaded Fasteners.
  • ASTM A307 ― Carbon Steel Externally Threaded Standard Fasteners.
  • ASTM A449 ― Quenched and Tempered Steel Bolts and Studs.
  • ASTM A325 ― High Strength Bolts for Stuctural Steel Joints. ;
  • ASTM A354 ― Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners.

 

Nuts Identification Markings
Grade Identification Marking Specification Material Nominal Size In. Proof Load Stress ksi Hardness Rockwell
Min Max
ASTM A563 Grade 0 Carbon Steel 1/4 thru 1 1/2 69 B55 C32
ASTM A563 Grade A Carbon Steel 1/4 thru 1 1/2 90 B69 C32
ASTM A563 Grade B Carbon Steel 1/4 thru 1 120 B69 C32
over 1 thru 1 1/2 105
a563_gc ASTM A563 Grade C Carbon Steel, Quenched and Tempered 1/4 thru 4 144 B78 C38
a563_gc3 ASTM A563 Grade C3 Atmospheric Corrosioin Resistant Steel, Quenched and Tempered 1/4 thru 4 144 B78 C38
a563_gd ASTM A563 Grade D Carbon Steel, Quenched and Tempered 1/4 thru 4 150 B84 C38
a563_dh ASTM A563 Grade DH Carbon Steel, Quenched and Tempered 1/4 thru 4 175 C24 C38
a563_dh3 ASTM A563 Grade DH3 Atmospheric Corrosioin Resistant Steel, Quenched and Tempered 1/4 thru 4 175 C24 C38
a194_g1 ASTM A563 Grade 1 Carbon Steel 1/4 thru 4 130 B70
a194_g2 ASTM A194 Grade 2 Medium Carbon Steel 1/4 thru 4 150 159 352
a194_2h ASTM A194 Grade 2H Medium Carbon Steel, Quenched and Tempered 1/4 thru 4 175 C24 C38
a194_2hm ASTM A194 Grade 2HM Medium Carbon Steel, Quenched and Tempered 1/4 thru 4 150 159 237
a194_g4 ASTM A194 Grade 4 Medium Carbon Steel, Quenched and Tempered 1/4 thru 4 175 C24 C38
a194_g7 ASTM A194 Grade 7 Medium Carbon Steel, Quenched and Tempered 1/4 thru 4 175 C24 C38
a194_g7m ASTM A194Grade 7M Medium Carbon Steel, Quenched and Tempered 1/4 thru 4 150 159 237

NOTES:

  1. In addition to the indicated grade marking, all grades, except A563 grades O, A and B, must be marked for manufacturer identification.
  2. 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 be additionally marked with the letter ‘B’.
  3. Nuts are not required to be marked unless specified by the purchaser. When marked, the identification marking shall be the grade letter O, A or B.
  4. Properties shown are those of nonplated or noncoated coarse thread hex nuts.
  5. Properties shown are those of coarse thread heavy hex nuts.
  6. Properties shown are those of coarse 8-pitch thread heavy hex nuts.
  7. Hardnesses are Brinell Hardness Numbers.
  8. The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel.
  9. Specifications —
    ASTM A563 — Carbon and Alloy Steel Nuts.
    ASTM A194/A194M — Carbon and Alloy Steel Nuts for Bolts for High Pressure and High Temperature Service.
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