Jade Alloys has been supplying ASTM A307 Fasteners to EPC contractors, petrochemical plants, and infrastructure projects across 50+ countries since 2005. All material supplied with EN 10204 / 3.1 Mill Test Reports. PED 2014/68/EC compliance available on request.
Jade Alloys is an accredited supplier and exporter of ASTM A307 Bolts in Mumbai, India, and stock of entire ASTM A307 Fasteners such as hex bolts, heavy hex bolts, a307 anchor bolts and ASTM A307 threaded rods. The ASTM standard establishes chemical and mechanical specifications on externally threaded carbon steel fasteners of tensile strength not under 60 ksi min. The specification addresses three grades (A, B and C) out of which Grade C has been replaced by ASTM F1554 Grade 36. ASTM A307 is not applicable to machine screws, thread-cutting screws and mechanical expansion anchors. The sampled specimens should possess values that are specified on chemical composition, hardness, tensile strength, yield point, elongation, and dimensions.
ASTM A307 Bolts Manufacturer & Exporter in India — Hex, Heavy Hex, Anchor Bolts & Threaded Rods
Jade Alloys is a major manufacturer and distributor in India of ASTM A307 Bolts and related fasteners including Long Bolts, 12-Point Bolts, and Studs (All-thread, Double-End, and more). Available in sizes 1/2″ to 3-1/2″ with matching nuts (Hex Nuts, Heavy Hex Nuts) and full-thread rods per ASME B18.2.1 and B18.3.
Our ASTM A307 Fasteners including Hex Cap Screws, machine bolts and Studs carry a minimum tensile strength of 60 ksi and operate with all common thread pitches (UNC, UNF, 8UN) as well as metric diameters. We supply hundreds of material, plating, and thread combinations, including custom A307 bolts to customer drawings, even for critical industrial applications.
Need ASTM A307 Bolts fast? Contact our team for a free quote and quick delivery from ready stock in Mumbai.
ASTM A307 Grades
| 307A |  |
Headed bolts, threaded rods and bent bolts intended for general applications. |
| 307B |  |
Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges. |
| 307C |  |
Non-headed anchor bolts, either bent or straight, intended for structural anchorage purposes. The end of a grade C anchor bolt intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplemental requirement. |
* Grade C has been withdrawn and superseded by ASTM F1554 Grade 36. Contact us to confirm which specification applies to your project.
Table of Contents
Types of ASTM A307 Fasteners
ASTM A307 Hex Cap Screws
ASTM A307 Carriage Bolts
ASTM A307 Heavy Hex Bolts
ASTM A307 Square Head Bolts
ASTM A307 Stud Bolts
ASTM A307 Hex Bolts
ASTM A307 Anchor Bolts
ASTM A307 Threaded Rods
ASTM A307 Eye Bolts
ASTM A307 U-Bolts
ASTM A307 Bolts Specifications
| Specification | ASTM A307 / ASME SA307 |
|---|---|
| Dimensions | ASME B18.2.1, B18.3 |
| Size | 1/4″ to 4″ (M6 to M100) — custom sizes available on request |
| Length | 3 mm to 200 mm (custom lengths available) |
| Threads | METRIC, BSW, BSF, UNC, UNF or as required |
| Threading Form | Hex, Square, Round, Threading per Gauge, etc. |
| Test Certificate | Manufacturer Test Certificate as per EN 10204 / 3.1 |
| Surface Finishing | Zinc (yellow, white, blue, black), Black Oxide, Geomet, Dacromet, Anodizing, Nickel Plated, Zinc-Nickel, Hot Dip Galvanised (HDG), Bright Zinc Plated (BZP), Sherardized, PTFE / Xylan Coated, Phosphate Coated, Cadmium Coated, DACROMET |
| Surface Finishing Standards | ASTM A153 (Hot-Dip Galvanizing), B633 (Electrodeposited Zinc), B695 (Mechanically Deposited Zinc), F2329 (Zinc Coating on Threaded Fasteners), B696 (Cadmium — Mechanically Deposited) |
| Production Process | M2–M24: Cold Forging; M24–M100: Hot Forging; Machining & CNC for custom components |
| Packing | Bulk carton, pallet, small box/carton/pallet, or per customer requirement |
ASTM A307 Bolts Chemical Composition
| Element | Grade A (max) | Grade B (max) |
|---|---|---|
| Carbon | 0.29% | 0.29% |
| Manganese | 1.20% | 1.20% |
| Phosphorus | 0.04% | 0.04% |
| Sulfur | 0.15% | 0.05% |
ASTM A307 Bolts Mechanical Properties
Grade A is used for general fastening; Grade B is specified for cast-iron flanged piping joints. Grade C (withdrawn — shown for reference only; use ASTM F1554 Gr. 36 instead).
| Grade | Tensile, ksi | Yield, min, ksi | Elong %, min |
|---|---|---|---|
| A | 60 min | — | 18 |
| B | 60 – 100 | — | 18 |
| C* | 58 – 80 | 36 | 23 |
Heat Treatment: ASTM A307 does not require heat treatment. Bolts are produced from carbon steel rod (typically A36 equivalent) and are not quenched or tempered, distinguishing them from higher-strength specifications such as ASTM A325 or ASTM A193 B7.
ASTM A307 Bolts Dimensions Chart
| Diameter | Body Dia (D) Max | Width Across Flats (F) | Width Across Corners (C) | Head Height (H) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Max | Basic | Max | Min | Max | Min | Basic | Max | Min | |
| 3/8 | 0.388 | 9/16 | 0.562 | 0.544 | 0.650 | 0.620 | 1/4 | 0.268 | 0.226 |
| 1/2 | 0.515 | 3/4 | 0.750 | 0.725 | 0.866 | 0.826 | 11/32 | 0.364 | 0.302 |
| 5/8 | 0.642 | 15/16 | 0.938 | 0.906 | 1.083 | 1.033 | 27/64 | 0.444 | 0.378 |
| 3/4 | 0.768 | 1-1/8 | 1.125 | 1.088 | 1.299 | 1.240 | 1/2 | 0.524 | 0.455 |
| 7/8 | 0.895 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.447 | 37/64 | 0.604 | 0.531 |
| 1 | 1.022 | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 43/64 | 0.700 | 0.591 |
| 1-1/8 | 1.149 | 1-11/16 | 1.688 | 1.631 | 1.949 | 1.859 | 3/4 | 0.780 | 0.658 |
| 1-1/4 | 1.277 | 1-7/8 | 1.875 | 1.812 | 2.165 | 2.066 | 27/32 | 0.876 | 0.749 |
| 1-3/8 | 1.404 | 2-1/16 | 2.062 | 1.994 | 2.382 | 2.273 | 29/32 | 0.940 | 0.810 |
| 1-1/2 | 1.531 | 2-1/4 | 2.250 | 2.175 | 2.598 | 2.480 | 1 | 1.036 | 0.902 |
| 1-3/4 | 1.785 | 2-5/8 | 2.625 | 2.538 | 3.031 | 2.893 | 1-5/32 | 1.196 | 1.054 |
| 2 | 2.039 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 1-11/32 | 1.388 | 1.175 |
| 2-1/4 | 2.305 | 3-3/8 | 3.375 | 3.262 | 3.897 | 3.719 | 1-1/2 | 1.548 | 1.327 |
| 2-1/2 | 2.559 | 3-3/4 | 3.750 | 3.625 | 4.330 | 4.133 | 1-21/32 | 1.708 | 1.479 |
ASTM A307 Threaded Rod Dimensions — Grade B Size Chart (Metric & Imperial)
| Thread Size | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M16 | M20 |
|---|---|---|---|---|---|---|---|---|---|
| Major Dia (mm) | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 16 | 20 |
| Thread Pitch (mm) | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 |
| Tapping Drill (mm) | 2.5 | 3.3 | 4.2 | 5 | 5.8 | 8.5 | 10.2 | 14 | 17.5 |
Imperial ASTM A307 threaded rod sizes available from 1/4″ to 4″. Contact us for specific pitch and length requirements.
A307 Grade B Threaded Rod Size Chart
| Thread Size | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M16 | M20 | |
|---|---|---|---|---|---|---|---|---|---|---|
| Major Dia | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 16 | 20 | |
| Thread Pitch (mm) | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | |
| Tapping Drill Size | 2.5 | 3.3 | 4.2 | 5 | 5.8 | 8.5 | 10.2 | 14 | 17.5 | |
ASTM A307 Bolt Torque Chart
Torque values below are for ASTM A307 Grade A bolts under dry (Plain), galvanized (Galv), and galvanized+waxed (Galv+Waxed) conditions. Always verify with your project engineering specification before installation.
| Bolt Size | 1/4 | 3/8 | 5/16 | 7/16 | 1/2 | 5/8 | 3/4 | 7/8 | 1 | 1-1/4 |
|---|---|---|---|---|---|---|---|---|---|---|
| TPI | 20 | 16 | 18 | 14 | 13 | 11 | 10 | 9 | 8 | 7 |
| Proof Load (lbs) | 1,053 | 2,567 | 1,735 | 3,521 | 4,700 | 7,485 | 11,062 | 15,301 | 20,071 | 32,093 |
| Clamp Load (lbs) | 790 | 1,925 | 1,302 | 2,640 | 3,525 | 5,614 | 8,297 | 11,476 | 15,053 | 24,070 |
| Torque Galv+Waxed (ft-lbs) | 2 | 6 | 3 | 10 | 15 | 29 | 52 | 84 | 125 | 251 |
| Torque Galv (ft-lbs) | 4 | 15 | 8 | 24 | 37 | 73 | 130 | 209 | 314 | 627 |
| Torque Plain (ft-lbs) | 3 | 12 | 7 | 19 | 29 | 58 | 104 | 167 | 251 | 501 |
ASTM A307 Bolt Markings & Identification
ASTM A307 bolts carry grade and manufacturer identification markings to allow field verification:
- Grade A: No mandatory grade mark on bolt head beyond manufacturer identification symbol.
- Grade B: Heavy hex bolts are marked “A307B” on the bolt head or stud end.
- Grade C (withdrawn / ASTM F1554 Gr. 36): The projecting end of anchor bolts intended to extend from concrete is painted green for field identification. Permanent marking is a supplemental requirement.
- Manufacturer’s trade mark or identification symbol is required on all grades.
Compatible Nuts & Washers for ASTM A307 Bolts
ASTM A307 bolts are designed for use with the following companion hardware:
| Component | Specification | Notes |
|---|---|---|
| Hex Nuts | ASTM A563 | Standard companion nut for A307 Grade A bolts |
| Heavy Hex Nuts | ASTM A194 Grade 2H | Used with Grade B bolts in high-pressure flanged piping joints |
| Hardened Washers | ASTM F436 | Hardened steel washers for use under bolt heads and nuts |
| Galvanized Nuts | ASTM A563 (oversize tapped) | Required with hot-dip galvanized bolts per A153 to maintain thread fit |
ASTM A307 vs A325 vs A193 B7 — Key Differences
| Property | ASTM A307 | ASTM A325 | ASTM A193 B7 |
|---|---|---|---|
| Material | Carbon Steel (A36 equiv.) | Medium Carbon Steel | Alloy Steel (Cr-Mo) |
| Tensile Strength | 60 ksi min | 120 ksi min | 125 ksi min |
| Heat Treatment | Not required | Quench & Temper | Quench & Temper |
| Primary Application | General construction, anchor bolts, pipe flanges (cast iron) | Structural steel connections, bridges | High-temp / high-pressure bolting, pressure vessels |
| Companion Nut | ASTM A563 | ASTM A563 DH / A194 2H | ASTM A194 2H / 7 |
| Temperature Rating | Ambient to moderate | Ambient | Up to 450°C (840°F) |
ASTM A307 Bolts Inventory
ASTM A307 Bolts
ASTM A307 Stud Bolts
ASTM A307 Hex Bolts
Contact Jade Alloys today with your ASTM A307 Bolts requirement. We assure you of the best quote from ready stock in Mumbai.
Applications of ASTM A307 Bolts
- Construction & Structural Steel — ASTM A307 Grade A hex bolts for general structural connections, sign supports, light-load framing, and miscellaneous steel work.
- Oil & Gas Piping Systems — ASTM A307 Grade B heavy hex bolts for cast-iron flanged joints in piping systems per ASME B16.5.
- Civil & Infrastructure — A307 Grade C anchor bolts (now ASTM F1554 Gr. 36) for structural column and equipment anchorage to concrete foundations.
- Marine & Offshore — A307 galvanized bolts (hot-dip per A153) for jetty structures, dock hardware, coastal installations, and covered bridge hardware.
- Power Generation — ASTM A307 threaded rods in utility and plant support structures, cable tray supports, and conduit hangers.
- Chemical & Petrochemical — PTFE-coated A307 bolts in non-critical pipe supports, equipment skid mounting, and general plant hardware applications.
Related Products
Frequently Asked Questions About ASTM A307 Bolts
What is ASTM A307 bolt material?
ASTM A307 covers carbon steel bolts and studs from 1/4″ to 4″ diameter, typically produced from A36 round bar. The specification has two active grades (A and B) plus Grade C, which was withdrawn and replaced by ASTM F1554 Grade 36. A307 does not require heat treatment, distinguishing it from higher-strength specs like A325 or A193 B7.
What is A307 Grade A equivalent to?
ASTM A307 Grade A bolts are low- to medium-strength fasteners with a minimum tensile strength of 60,000 psi, intended for general, non-critical applications. They are considered equivalent to SAE J429 Grade 2 specification.
What is the difference between A325 and A307 bolts?
A307 bolts are general-purpose, non-heat-treated carbon steel fasteners (60 ksi minimum) used in light construction, sign supports, and anchor applications. A325 bolts are high-strength structural bolts (120 ksi minimum), quench-and-temper heat treated, and specified for load-bearing steel connections in buildings and bridges. A307 must not be substituted for A325 in engineered structural joints.
Are ASTM A307 bolts available in galvanized finish?
Yes. ASTM A307 galvanized bolts are produced with hot-dip galvanizing per ASTM A153 or mechanically deposited zinc per B695. Threads on galvanized A307 bolts are cut oversize before coating to maintain fit with ASTM A563 nuts. Jade Alloys supplies a307 galvanized bolts in Grade A and Grade B in standard and custom lengths from Mumbai ready stock.
What is an ASTM A307 anchor bolt?
ASTM A307 anchor bolts (originally Grade C) are non-headed carbon steel bolts — bent (L-shape or J-shape) or straight — used for structural anchorage into concrete foundations. Grade C was officially withdrawn and replaced by ASTM F1554 Grade 36. Jade Alloys supplies both A307 Grade A/B bolts and F1554 Grade 36 anchor bolts — contact us to confirm the correct specification for your project.
