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ASTM F836M Stainless Steel Nuts Specification

Stainless Steel Metric Hex Nuts, Square Nuts & Flange Nuts for use in applications requiring general corrosion resistance

ASTM F836M Hex Nut, Heavy hex Nut, Square Nuts, Hexagon High Nuts, Slotted Nuts

ASTM F836M Specification covers the chemical and mechanical requirements for Metric Hex Nuts, Square Nuts & Flange Nuts with nominal thread diameters M1.6 through M36 and intended for use in engineering applications requiring general corrosion resistance. Eight groups of stainless steel alloys are covered, including three austenitic (Grades A1, A2, and A4), one ferritic (Grade F1), three martensitic (Grades C1, C3, and C4), and one precipitation hardening (Grade P1). Seventeen property classes are covered, including nine austenitic, one ferritic, six martensitic, and one precipitation hardening.

ASTM F836M Scope

Property Class Permissible Alloys
A1-50 304, 304L, 305A
A1-70 384, 18-9LW, 302HQ
A1-80 ... 
A2-50 ...
A2-70 321, 347
A2-80 ... 
A4-50 ...
A4-70 316, 316L
A4-80 ... 
F1-45 430B
C1-70 410
C1-110 ... 
C3-80 431
C3-120 ... 
C4-70 416, 416Se
C4-110 ... 
P1-90 630
  • (A) When approved by the purchaser, Alloys 303, 303Se, or XM1 may be furnished.
  • (B) When approved by the purchaser, Alloy 430F may be furnished.

ASTM F836M Chemical Requirements

Alloy Group Alloy UNS Designation C Mn P S Si Cr Ni Cu Mo Others
 A1 303 S30300 0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0 to 10.0 ...  0.60 maxA ... 
 A1 303Se S30323 0.15 2.00 0.20 0.060 1.00 17.0 to 19.0 8.0 to 10.0 ...  ...  Se 0.15 min
 A1 304 S30400 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5 1.00   ... 
 A1 304L S30403 0.03 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 12.0 1.00   ... 
 A1 305 S30500 0.12 2.00 0.045 0.030 1.00 17.0 to 19.0 10.5 to 13.0 1.00   ... 
 A1 384 S38400 0.08 2.00 0.045 0.030 1.00 15.0 to 17.0 17.0 to 19.0     ... 
 A1 XM1 S20300 0.08 5.0 to 6.5 0.040 0.18 to 0.35 1.00 16.0 to 18.0 5.0 to 6.5 1.75 to 2.25 0.50 maxA ... 
 A1 18-9LW S30430 0.10 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0 ...  ... 
 A1 302HQ S30433 0.03 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0 ...  ... 
 A4 316 S31600 0.08 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 ...  2.00-3.00 ... 
 A4 316L S31603 0.03 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 ...  2.00-3.00 ... 
 A2† 321 S32100 0.08 2.00 0.045 0.030 1.00 17.0 to 19.0 9.0 to 12.0 ...  ...  Ti  5 × C min
 A2 347 S34700 0.08 2.00 0.045 0.030 1.00 17.0 to 19.0 9.0 to 13.0 ...  ...  Cb + Ta 10 × C min
 F1 430 S43000 0.12 1.00 0.040 0.030 1.00 16.0 to 18.0 ...  ...    ... 
 F1 430F S43020 0.12 1.25 0.060 0.15 min 1.00 16.0 to 18.0 ...  ...  0.60 maxA ... 
 C1 410 S41000 0.15 1.00 0.040 0.030 1.00 11.5 to 13.5 ...  ...  ...  ... 
 C4 416 416Se S41600 0.15 1.25 0.060 0.15 min 1.00 12.0 to 14.0 ...  ...  0.60 maxA Se 0.15 min
 C4 ...  S41623 0.15 1.25 0.060 0.060 1.00 12.0 to 14.0 ...  ...  ...  ... 
 C3 431 S43100 0.20 1.00 0.040 0.030 1.00 15.0 to 17.0 1.25 to 2.50 ...  ...  ... 
 P1 630 S17400 0.07 1.00 0.040 0.030 1.00 15.0 to 17.5 3.0 to 5.0 3.0 to 5.0 ...  Cb + Ta 0.15-0.45
  • (A) At manufacturer's option, determined only when intentionally added.

ASTM F836M Mechanical Properties

Nominal Size and Thread Pitch Stress Area, mm2 Proof Load Stress, MPaA
450 500 550 600 650 700 800 900 1100 1200
M1.6 × 0.35 1.27 0.57 0.64 . . . 0.76 . . . 0.89 1.02 1.14 1.40 1.52
M2 × 0.4 2.07 0.93 1.04 . . . 1.24 . . . 1.45 1.66 1.86 2.28 2.48
M2.5 × 0.45 3.39 1.52 1.70 . . . 2.03 . . . 2.37 2.71 3.05 3.73 4.07
M3 × 0.5 5.03 2.26 2.52 . . . 3.02 . . . 3.52 4.02 4.53 5.53 6.04
M3.5 × 0.6 6.78 3.05 3.39 . . . 4.07 . . . 4.75 5.42 6.10 7.46 8.14
M4 × 0.7 8.78 3.95 4.39 . . . 5.27 . . . 6.15 7.02 7.90 9.66 10.5
M5 × 0.8 14.2 6.39 7.10 . . . 8.52 . . . 9.94 11.4 12.8 15.6 17.0
M6 × 1 20.1 9.05 10.1 . . . 12.1 . . . 14.1 16.1 18.1 22.1 24.1
M8 × 1.25 36.6 16.5 18.3 . . . 22.0 . . . 25.6 29.3 32.9 40.3 43.9
M10 × 1.5 58.0 26.1 29.0 . . . 34.8 . . . 40.6 46.4 52.2 63.8 69.6
M12 × 1.75 84.3 37.9 42.2 . . . 50.6 . . . 59.0 67.4 75.9 92.7 101 
M14 × 2 115 51.7 57.5 . . . 69.0 . . . 80.5 92.0 104  127  138 
M16 × 2 157  70.7 78.5 . . . 94.2 . . . 110  126  141  173  188 
M20 × 2.5 245  110   123  135 147  . . . 172  196  221  270  294 
M24 × 3 353  159  177  194 212  . . . 247  282  318  388  424 
M30 × 3.5 561  252  281  309 337  365 393  449  505  617  673 
M36 × 4 817  368  409  449 490  . . . 572  654  735  899  980 
  • (A) Proof Load = As x Proof Load Stress 
  • As = 0.7854 (D − 0.9382 P)2
  • where:
  • D = nominal , mm,
  • P = thread pitch, mm, and
  • Proof Load Stress is found in Table 2.

ASTM F836M Materials and Manufacture

Property Class ConditionA Alloy/Mechanical Property Marking Nominal Thread Diameter Proof Load Stress, MPa Hardness
Vickers Rockwell
min max min max
A1-50 ...  F836A ... ... ... ... ... ...
A2-50 A or AF F836B M1.6 to M36 500 155 220 B81 B95
A4-50 ...  F836C ...  ...  ...  ...  ...  ... 
A1-70 ...  F836D M1.6 to M20 700 220 330 B96 C33
A2-70 CW F836E over M20 to M36 550 160 310 B83 C31
A4-70 ...  F836F ...  ...  ...  ...  ...  ... 
A1-80 ...  F836G M1.6 to M20 800 240 350 C23 C36
A2-80 SH F836H over M20 to M24 700 220 330 B96 C33
A4-80 ...  F836J over M24 to M30 650 200 310 B93 C30
...  ...  ...  over M30 to M36 600 180 285 B89 C28
F1-45 A or AF F836K M1.6 to M36 450 135 220 B74 B96
C1-70 H F836L M1.6 to M36 700 220 330 B96 C34
C4-70 F836M
C1-110 C4-110 HT F836N F836P M1.6 to M36 1100 350 440 C36 C45
C3-80 H F836R M1.6 to M36 800 240 340 C23 C35
C3-120 HT F836S M1.6 to M36 1200 380 480 C39 C48
P1-90 AH F836T M1.6 to M36 900 285 370 C28 C38
  • (A) Legend of Conditions: 
  • AF-formed and annealed. 
  • CW-formed from annealed stock, thus acquiring a degree of cold work. 
  • SH-machined from strain hardened stock. 
  • A-machined from annealed or solution annealed stock, thus retaining the properties of the original material, or hot formed and solution annealed. 
  • H-hardened and tempered at 565°C medium. 
  • HT-hardened and tempered at 275°C minimum. 
  • AH-solution annealed and age hardened after forming.

ASTM F836M Bolting Surface Treatment Specifications

ASTM F836M Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

ASME Dimensional Standards

ASTM F836M Bolting Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

ASTM F836M Testing Standards

E18 Test Methods for Rockwell Hardness of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E709 Guide for Magnetic Particle Testing
A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
A788/A788M Specification for Steel Forgings, General Requirements

ASME Threading Specifications

ASME B1.1  Unified Inch Screw Threads (UN and UNR Thread Form)
ASME B1.3  Screw Thread Gaging System for Dimensional Acceptability - Inch Screw Threads (IN, UNR, and UNJ)
ASME B1.13M Metric Screw Threads - M Profile
ASME B1.21M Metric Screw Threads - MJ Profile
ASME B1.2 Gages & gauing for Unified Screw Threads(Imperial)

ASTM F836M Supplementary Requirements

S1 Additional Tests
S2 Alloy Contro
S3 Permeability
S4 Shipment Lot Testing
S5 Heat Control