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ASTM F432 Roof & Rocket Bolting Specification

Roof & Rocket Bolts, Double end threaded and slotted steel bars, fully grouted bolts and threaded bars, mechanical anchorage devices used for point anchorage applications

ASTM F432 Stud Bolts, Studs, Threaded Rods & Bars

ASTM F432 specification covers the chemical, mechanical, and dimensional requirements for roof and rock bolts and accessories. Addressed in this specification are double-end threaded and slotted steel bars; fully grouted bolts and threaded bars; mechanical anchorage devices used for point anchorage applications; roof truss systems; partially grouted deformed bolts; formable anchorage devices; cable bolt systems; expandable rock bolts and other frictional anchorage devices. All of these products represent various designs used for ground support systems.

Related Specifications of ASTM F432 Bolting

A194 F436 A563 F1554

ASTM F432 Chemical Requirements

Product Carbon, max, % Sulfur, max, % Phosphorus, max, %
Heat Product Heat Product Heat Product
Bolts, threaded   bars, and threaded  slotted barsA 0.75 0.79 0.13 B 0.050 0.058
Steel tapered wedges 0.80 0.84 0.13 B 0.050 0.058
Hardened spherical, flat, or beveled  washers 0.80 0.84 0.050 0.058 0.050 0.058
Spherical or beveled washers 0.80 0.84 0.050 0.058 0.050 0.058
Bearing and header   plates 1.00 1.04 0.050 0.058 0.050 0.058
Steel threaded tapered   plugs 0.60 0.64 0.13 B 0.050 0.058
Steel expansion shells 0.30 0.33 0.050 0.058 0.050 0.058
  • (A) Bars furnished in accordance with Specification A615/A615M may be substituted for these requirements.
  • (B) Check analysis for sulfur if a resulfurized steel is not technically appropriate.

ASTM F432 Appropriate Nuts

Bolt, Threaded Bar, or Threaded Slotted Bar Grade Nut Specification
30 (regular strength) A194/A194M, Grade 1; A563, Grade B
55 (high strength) A194/A194M, Grade 1; A563, Grade B
75 (extra high strength) A194/A194M, Grade 2; A563, Grade C

ASTM F432 Mechanical Properties of Sheet Steel for the Manufacture of Friction Stabilizers

DesignationA Nominal Diameter, inB Minimum yield strength, psi C
33 1.33 60 000
39 1.54 60 000
46 1.81 50 000

ASTM F432 Mechanical Properties of Steel Bars for the Manufacture of Bolts, Threaded Bars, and Threaded Slotted BarsAB

Grade Nominal Diameter, in.C Yield Point min, psi Tensile Strength min, psi Elongation in 8 in. or 200 mm Minimum, %
ASTM F432 Grade 40D 3/4 -11/2 40 000 70 000 12
ASTM F432 Grade 55 5/8 -11/2 55 000 85 000 12
ASTM F432 Grade 60D 5/8 -11/2 60 000 90 000 9
ASTM F432 Grade 75 5/8 -11/2 75 000 100 000 8
ASTM F432 Grade 100 5/8 -11/2 100 000 125 000 6
  • (A) Designation denotes traditional reference to nominal millimeter diameter measurement as previously established.
  • (B) As measured across bolt diameter perpendicular to the slot as indicated in Fig. 7.
  • (C) Per Specification A1011/A1011M.

ASTM F432 Load Support Requirements of Steel Bolts, Threaded Bars, Thread Deformed Bars, and Threaded Slotted Bars Whose Slot Has Been Produced Without Metal RemovalA

Threaded Bars and Slotted Threaded Bars
Threaded Bars and Slotted Threaded Bars

Nominal Diameter (in.)/Thread /in. Thread Stress Area, in.2 Grade
40B 55 60B 75 100
Yield lbs C Ultimate lbs C Yield lbs C Ultimate lbs C Yield lbs C Ultimate lbs C Yield lbs C Ultimate lbs C Yield lbs C Ultimate lbs C
5/8 -11 0.226 D D 12 400 19 200 13 600 20 300 17 000 22 600 22 600 26 300
3/4 -10 0.334 13 400 23 400 18 400 28 400 20 000 30 100 25 100 33 400 33 400 41 800
7/8 -9 0.462 18 500 32 300 25 400 39 300 27 700 41 600 34 700 46 200 46 200 57 800
1-8 0.606 24 200 42 400 33 300 51 500 36 400 54 500 45 500 60 600 60 600 75 800
11/8 -7 0.763 30 500 53 400 42 000 64 900 45 800 68 700 57 200 76 300 76 300 95 400
11/4 -7 0.969 38 800 67 800 53 300 82 400 58 100 87 200 72 700 96 900 96 900 121 100
13/8 -6 1.155 46 200 80 900 63 500 96 200 69 300 104 000 86 600 115 500 115 500 144 400
11/2 -6 1.405 56 200 98 400 77 300 119 400 84 300 126 500 105 400 140 500 140 500 175 600
  • (A) Tests of bolts and threaded bars shall be performed using full-diameter products.
  • (B) Information for Gr 40 and 60 only applies to deformed bars.
  • (C) Required yield and tensile loads shown are calculated by multiplying thread stress areas times the yield point and tensile strength values shown in Table 3. Thread stress area is calculated from the mean root and pitch diameters of adrenal threads as follows: 
  • (D) 5/8 in. Gr 40 products are not covered.
Nominal Diameter, in. Thread Stress Area, min, in.2 Grade 55
Yield Load, min, lbf B Ultimate Tensile Load, min, lbf B
1  0.606 30 000 46 400
11/4 0.969 48 000 74 200
13/8 1.155 57 200 88 400
11/2 1.405 69 600 107 500
  • (A) Tests of bolts, threaded bars, and threaded slotted bars shall be performed using full-diameter products.
  • (B) Required yield and tensile loads shown are calculated by multiplying thread stress areas times the yield point and tensile strength values shown in Table 2. Thread stress area is calculated from the mean of the mean root and pitch diameters of Class 3 external threads as follows: 
  • where:
  • A s = stress area, in. 2
  • D = nominal diameter, in., and
  • n = number of threads per inch.

ASTM F432 Plug Grade Rating System

Nominal Diameter, in. Grade 1 Grade 2 Grade 3 Grade 4
MNSLA MULB MNSLA MULB MNSLA MULB MNSLA MULB
1/2 7.0 14.2 10.7 17.0 13.5 19.9 16.3 22.7
5/8 12.4 22.6 17.0 27.1 21.5 31.6 26.0 36.1
3/4 18.4 33.4 25.1 40.1 31.7 46.8† 38.4 53.4†
7/8 25.4† 46.2 34.7 55.4 40.0 64.7 40.0 73.9
1 33.3 60.6 40.0 72.7 40.0 84.8 40.0 96.9
11/8 40.0 76.3 40.0 91.6 40.0 106.8 40.0 122.0
11/4 40.0 96.9 40.0 116.3 40.0 135.7 40.0 155.0†
13/8 40.0 115.5† 40.0 138.6 40.0 161.7 40.0 184.8
11/2 40.0 140.5† 40.0 168.6 40.0 196.7 40.0 224.8
  • (A) MNSL-Minimum Non-Seizure Load (1000 lb).
  • (B) MUL-Minimum Ultimate Load (1000 lb).

ASTM F432 Dimensions

ASTM F432 Load Support and Dimensional Requirements for Friction Stablilizers

DesignationA Nominal Diameter, in.B Minimum Ultimate Load, lbs OD tolerance, in. Length Tolerance, in. C
33 1.33 20 000 ± 0.03 +1/4 , -1/2
39 1.54 23 000 + 0.02,-0.04 +1/4 , -1/2
46 1.81 32 500 ± 0.03 +1/4 , -1/2
  • (A) Designation denotes traditional reference to nominal millimeter diameter measurement as previously established.
  • (B) As measured across bolt diameter perpendicular to the slot as indicated in Fig. 7
  • (C) Bolt length is measured end-to-end (actual friction stabilizer tubing length).

ASTM F432 Round and Square Hardened Washer Type 1

Round and Square Hardened Washer
Round and Square Hardened Washer

Bolt Size, in. Nominal Outside Dimension, (O. D.) in. Inside Diameter, (I. D.) in. Thickness, in. (T)
5/8 2 11/16 to 27/32 0.122 to 0.177
3/4 2 13/16 to 31/32 0.122 to 0.177
7/8 2 15/16 to 15/32 0.132 to 0.177
1 2 11/8 to 19/32 0.132 to 0.177
11/8 21/2 11/4 to 113/32 0.132 to 0.177
11/4 21/2 13/8 to 117/32 0.132 to 0.177
11/2 3 15/8 to 125/32 0.132 to 0.177

ASTM F432 Bolting Surface Treatment Specifications

ASTM F432 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.

 Grade Headed Plain Bolts Nominal Product Size Manufacturer's SymbolC DiameterD GradeE Length in Inches (or Millimetres)
ASTM F432 Grade GR 40F 3/4 - diameter and over yes yes none yes
ASTM F432 Grade GR 55 5/8 - diameter and over yes yes ASTM F432 Grade GR 55 yes
ASTM F432 Grade GR 60F 5/8 - diameter and over yes yes ASTM F432 Grade GR 60 F yes
ASTM F432 Grade GR 75 5/8 - diameter and over yes yes ASTM F432 Grade GR 75 yes
ASTM F432 Grade GR 100 5/8 - diameter yes yes ASTM F432 Grade GR 100 yes
  • mark
  • (A) No marks are required on the beveled washers, threaded couplings, or extensions.
  • (B) No other markings may be used to designate additional specifications and will be defined in the manufacturer's literature.
  • (C) Enter alpha numerical symbol
  • (D) Enter numerical value of bolt or bar diameter measured in eighths, for example, 5. Numerical value of non-full-dimension bar to have numerical value and specific manufacturer designation.
  • Numerical value of full dimension deformed bars to be placed in a circle, for example:
  • (E) Grades greater than 100 psi are to be produced in 20 000-psi increments and marked as follows:
  • 2 for 120 psi,
  • 4 for 140, etc.
  • (F) Grade 40 and 60 only apply to deformed bar.
  • (G) Marking editions noted in Note D of F432-10 shall be implemented as manufacturing tooling changes occur by agreement between the Mine Safety and Health Administration (MSHA) and manufacturers.

ASME Dimensional Standards

B18.2.2 Imperial Square, Hex, Heavy Hex, Lock, Heavy Hex Lock Nuts
B18.22.1 Type A Plain Washers
B18.22.1 Type B Plain Washers

ASTM F432 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 F432 Testing Standards

E18 Test Methods for Rockwell Hardness of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E112 Test Methods for Determining Average Grain Size
E139 Test Methods for Conducting Creep, Creep-Rupture,and Stress-Rupture Tests of Metallic Materials
E150 Recommended Practice for Conducting Creep and Creep-Rupture Tension Tests of Metallic Materials Under Conditions of Rapid Heating and Short Times
E151 Recommended Practice for Tension Tests of Metallic Materials at Elevated Temperatures with Rapid Heating and Conventional or Rapid Strain Rates
E292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials
E328 Test Methods for Stress Relaxation for Materials and Structures
E566 Practice for Electromagnetic (Eddy Current) Sorting of Ferrous Metals
E709 Guide for Magnetic Particle Testing
F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
F1940 Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners
A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
A788/A788M 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)