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ASTM F835/F835M Alloy Steel Screws Specification

Quenched & Tempered Alloy Steel Hexagon Socket Button & Flat CounterSunk Head Cap Screws

ASTM F835/F835M Socket Button and Flat Countersunk Head Cap Screws

ASTM F835 specification covers the requirements for quenched and tempered alloy steel hexagon socket button (SBHCS) #0 through 5/8 inch thread sizes and flat countersunk (SFHCS) #0 through 1 1/2 thread sizes head cap screws having material properties for high-strength requirements. ASTM F835 Fasteners meeting this specification are intended for shear-type applications and have tensile requirements ranging from 122 to 150 ksi.The screws shall be fabricated from alloy steel made to fine grain practice. In the event of controversy over grain size, referee tests on finished screws conducted in accordance with Test Methods E112 shall prevail. ASTM F835 Screws shall be hot or cold upset or extruded, or both. Unless otherwise specified, threads shall be rolled for diam eters through 5/8 Inch and for screw lengths through 4 Inch For diameters and lengths other than this, threads may be rolled, cut or ground.

ASTM F835/F835M Chemical Requirements

Element Heat Analysis Product Analysis
C 0.30 to 0.48 0.28 to 0.50
P, max 0.035 0.040
S, max 0.040 0.045

ASTM F835/F835M Mechanical Requirements

Type Mechanical Requirements Nominal Thread Size, in.
0.500 andsmaller Over 0.500
Full-size Screws Tensile, min, ksi 144 136
Machined Test Specimen Yield strength at 0.2 % offset, min, ksi A 153
Tensile strength, min, ksi A 170
Elongation in 4 D , min, % A 8
Reduction of area, min, % A 35
Product Hardness Rockwell C 39-44 37-44
Vickers DPH 382-434 363-434
  • (A) Not applicable.

ASTM F835/F835M Minimum Ultimate Tensile Loads

Thread Size Stress Area,B in.2 Button and Countersunk
Heads, Tensile Load,
min lbA
Coarse Fine Coarse Fine Coarse Thread Series Fine Thread Series
. . . 0.060-80 . . . 0.00180 ... 260
0.073-64 0.073-72 0.00263 0.00278 380 400
0.086-56 0.086-64 0.00370 0.00394 530 570
0.099-48 0.099-56 0.00487 0.00523 700 750
0.112-40 0.112-48 0.00604 0.00661 870 950
0.125-40 0.125-44 0.00796 0.00830 1150 1200
0.138-32 0.138-40 0.00909 0.01015 1310 1460
0.164-32 0.164-36 0.0140 0.01474 2020 2120
0.190-24 0.190-32 0.0175 0.0200 2520 2900
0.250-20 0.250-28 0.0318 0.0364 4580 5240
0.3125-18 0.3125-24 0.0524 0.0580 7550 8350
0.375-16 0.375-24 0.0775 0.0878 11 200 12600
0.4375-14 0.4375-20 0.1063 0.1187 15 300 17100
0.500-13 0.500-20 0.1419 0.1599 20 400 23000
0.625-11 0.625-18 0.226 0.256 30 700 34800
0.750-10 0.750-16 0.334 0.373 45 400 50700
0.875-9 0.875-14 0.462 0.509 62 800 69200
1.000-8 1.000-12 0.606 0.663 82 400 90400
. . . 1.00-14 UNSC . . . 0.680 . . . 92500
1.125-7 1.125-12 0.763 0.858 104 000 116400
1.250-7 1.250-12 0.969 1.073 132 000 146000
1.375-6 1.375-12 1.155 1.315 157 000 179000
1.500-6 1.500-12 1.405 1.581 191 000 215000
  • (A) Because of the head critical configuration of these parts, the full size tensile loads are based on 80 % of the minimum heat treated material strength (180 ksi for sizes 0.500 in. and smaller and 170 ksi for sizes larger than 0.500 in.)
  • (B) Stress Area, in.2 = 0.7854[D- 0.9743/n]2 where D = nominal diameter, in., and n = threads/in.
  • (C) In the Unified Screw Thread System, 1-12 UNF is the standard for inch series fine threads; however, 1-14 UNS is more commonly available.

ASTM F835/F835M Decarburization Limits

ASTM F835/F835M Decarburization Limits

Threads/in. Thread Height, hs 0.75 hs from Root to Crest, min 0.1 hs at Root, max
48 0.013 0.010 0.001
44 0.014 0.011 0.001
40 0.015 0.011 0.002
36 0.017 0.013 0.002
32 0.019 0.014 0.002
28 0.022 0.017 0.002
24 0.026 0.020 0.003
20 0.031 0.023 0.003
18 0.034 0.026 0.003
16 0.038 0.029 0.004
14 0.044 0.033 0.004
13 0.047 0.035 0.005
12 0.051 0.038 0.005
11 0.056 0.042 0.006
10 0.061 0.046 0.006
9 0.068 0.051 0.007
8 0.077 0.058 0.008
7 0.088 0.066 0.009
6 0.102 0.077 0.010

ASTM F835/F835M Bolting Surface Treatment Specifications

ASTM F835/F835M 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

B18.3 Socket Cap, Shoulder and Set Screws-Inch Series
ISO 4762 Socket Head Cap Screws

ASTM F835/F835M 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 F835/F835M Testing Standards

A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
E112 Test Methods for Determining Average Grain Size
F788 Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
E18 Test Methods for Rockwell Hardness of Metallic Materials
E384 Test Method for Microindentation Hardness of Materials

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 Gauges & gauging for Unified Screw Threads(Imperial)