Astm A307 Anchor Bolts Specifications ((better)) Online

ASTM A307 is the standard specification for carbon steel bolts, studs, and threaded rods. Often referred to as "low carbon" or "mild steel" fasteners, these anchor bolts are a staple in general construction for non-structural or light-duty anchorage. While ASTM A307 covers a wide range of fasteners, it specifically outlines three grades—A, B, and C—each defined by its mechanical properties and intended applications. ASTM A307 Grade Overview The specification categorizes fasteners based on their tensile strength and design purpose: Grade A: Intended for general-purpose applications. These are the most common "off-the-shelf" bolts, offering a minimum tensile strength of 60 ksi . Grade B: Designed specifically for flanged joints in piping systems, particularly those with cast iron flanges. These have a controlled tensile range between 60 and 100 ksi . Grade C (Discontinued): Previously used for non-headed structural anchor bolts. As of 2007, Grade C has been officially replaced by ASTM F1554 Grade 36 . www.vihasteel.comhttps://www.vihasteel.com ASTM A307 Grade A Anchor Bolts and Threaded Rod Dimensions

ASTM A307 anchor bolt specifications cover carbon steel fasteners, typically categorized as "mild steel" or "everyday" bolts, ranging from 1/4" to 4" in diameter. While traditionally containing three grades, ASTM A307 Grade C was the specific designation for anchor bolts until it was officially replaced in 2007 by the ASTM F1554 Grade 36 specification. Grades and Applications The specification is divided into grades based on mechanical properties and intended use: Grade A : General-purpose bolts, threaded rods, and bent bolts with a minimum tensile strength of 60 ksi. Grade B : Heavy hex bolts and studs specifically for flanged joints in piping systems with cast iron flanges; these have a tensile strength range of 60–100 ksi. Grade C : Originally designated for non-headed, bent, or straight anchor bolts for structural anchorage. Technical guides from Portland Bolt note that these are often color-coded green on the projecting end for identification. F1554 Grade 55 vs A307 Grade C - Portland Bolt

Here is helpful content regarding ASTM A307 anchor bolt specifications . ASTM A307 is the standard specification for carbon steel bolts, studs, and threaded rods, commonly used for anchor bolts in non-critical, low-stress applications (e.g., structural bolting, flanged joints, and anchoring equipment to concrete).

Key Specifications for ASTM A307 Anchor Bolts 1. Grades of ASTM A307 astm a307 anchor bolts specifications

Grade A: Low carbon steel (≈ 1018–1022). Most common for general-purpose anchor bolts. Grade B: Higher carbon or low-alloy steel. Slightly stronger, but less common for anchor bolts. Grade C: (Rarely specified) Similar to A36 steel; strength between Grade A and Grade B.

Note: For anchor bolts, Grade A is the typical choice.

2. Mechanical Requirements (Grade A – anchor bolt relevant) | Property | Requirement | |----------|--------------| | Tensile Strength | 60 ksi (415 MPa) min | | Yield Strength (min) | 36 ksi (248 MPa) typical (not mandatory by A307 but common for Grade A) | | Elongation (in 2 in.) | 18% min | | Reduction of Area | 35% min | 3. Chemical Composition (Grade A – max unless noted) | Element | % | |---------|----| | Carbon | 0.29% (for sizes < 1" dia); 0.31% (for 1" to 1½" dia) | | Manganese | 0.60–0.90% (depends on heat analysis) | | Phosphorus | 0.04% | | Sulfur | 0.05% | 4. Threading & Length ASTM A307 is the standard specification for carbon

Threads may be UNC (Unified Coarse) or 8UN for longer lengths. Thread length: Standard is 6 in. minimum for bolts up to 6 in. long; for longer bolts, thread length = 2× diameter + ¼ in. (or as agreed). Anchor bolts often have L-shape (bent) or J-shape ends for concrete embedment, but ASTM A307 does not specify the bend — that is by project drawing.

5. Marking Requirements

Grade A: No mandatory marking (but may have "A307" or manufacturer ID) Grade B: Must be marked "A307 B" Hex head markings: Grade A usually has no radial lines (unlike Grade 2 or 5). These have a controlled tensile range between 60

6. Common Applications for A307 Anchor Bolts

Light structural steel columns to concrete footings Industrial equipment anchoring (non-seismic, low vibration) Concrete foundation anchor bolts for tanks, conveyors, platforms Masonry anchor bolts