J Bolts Manufacturer in India | ASTM F1554 Grade 36 J Anchor Bolts

Overview

ASTM F1554 Grade 36 J Anchor Bolts & Stainless J Hook Bolts: Manufacturer & Supplier

A J bolt is a round steel rod with a thread at one end and a J-shaped hook at the other. Cast into concrete, the hook keeps the rod from pulling out, and a nut on the projecting thread holds down a sill plate, a column base or a machine.

Exotic Alloy manufactures J bolts in Mumbai, India. Anchor bolts are made to ASTM F1554 from certified bar: threads are rolled or cut, the hook is bent on a former, and the bolts are hot-dip galvanized after bending when required. Each grade is marked with its F1554 colour. We supply contractors and distributors in India, and export to Canada, the USA, the Gulf and Africa.

Custom Sizes, Quick Delivery

Common ½″ × 10″ to ¾″ × 18″ sill-plate J bolts in Grade 36 galvanized ship from stock. Other lengths, hooks, grades and stainless J hook bolts are made to your drawing.

½ – 1½″ | M10 – M36 Any length & hook Grade 36 / 55 / 105 HDG or stainless Nuts & washers included

J bolt at a glance

Form: Round rod, threaded one end, bent into a J (180°) hook
Standard: ASTM F1554 Grades 36, 55, 105 (anchor rods)
Thread: UNC class 1A / 2A; 8UN on request
Hardware: ASTM A563 nuts, F436 or plate washers
Design: ACI 318 hooked-bolt pullout; IRC R403.1.6 for sills
Related: Anchor bolts, U bolts, nuts

Parts of a J anchor bolt, and the bolt in use (not to scale). Length L is measured from the inside of the bend to the end of the thread. The hook length e_h is measured from the inner face of the shank to the outer tip, the dimension ACI 318 uses for pullout. The F1554 grade colour goes on the projecting end.

Specification

J Bolt Specification

The range we manufacture and supply.

StandardsASTM F1554 anchor rods (Grades 36, 55, 55 S1 weldable, 105); ASTM A563 nuts; ASTM F436 washers; IS 5624 foundation bolts and ISO 898-1 classes for metric J bolts

Size range½″ to 1½″ diameter as J bolts (larger as L bolts); lengths 6″ to 60″; metric M10 to M36

ThreadUNC class 1A or 2A as F1554 default; 8UN on request; rolled or cut; thread length to order (tolerance +1″ / −0)

Hook180° J hook as standard; 90° L bend on request; hook length to drawing (we recommend 3 to 4.5 × D for ACI design)

GradesF1554 Grade 36: 36 ksi yield; Grade 55: 55 ksi; Grade 105: 105 ksi (Q&T alloy); stainless 304 / 316 for J hook bolts

MaterialsCarbon and HSLA steel bar (Grades 36 / 55); Cr-Mo alloy bar (Grade 105); stainless 304 / 316; duplex to order

FinishPlain (black); hot-dip galvanized to ASTM A153 Class C or F2329 after bending; partial galvanizing of the projecting end on request; passivated stainless

IdentificationF1554 end colour (blue / yellow / red, yellow + white for 55 S1); AB36 / AB55 / AB105 stamping under S3 on request

CertificationMill certificate; test report with tensile, yield, elongation and reduction of area; Charpy (S4) on request; EN 10204 3.1

PackingBundled by size and length, with nuts and washers bagged per bundle; tagged with grade, size, heat number and quantity

Types

Types of J Bolts We Manufacture

Sill Plate J Bolts

F1554 Gr 36 · ½″ & ⅝″ · galvanized

For anchoring wood sill plates to foundations under the residential code. They are supplied with a nut and washer and, where required, a square plate washer.

Structural J Anchor Bolts

F1554 Gr 36 / 55 / 105 · ¾ – 1½″

For light columns, poles, signs, equipment pads and tanks, made to the hook, thread and projection on your drawing.

L Bolts (90° Bend)

F1554 · same ACI rule as J bolts

A right-angle bend instead of a J. It is easier to tie into reinforcement and is treated by ACI 318 like a J bolt. See also anchor bolts.

J Hook Bolts

SS 304 / 316 · galvanized · M6 – M16

Threaded J hooks with nut and washer for hanging pipes and cable trays, fixing roof sheets to purlins and securing loads, as in the product photo.

Metric J Foundation Bolts

M10 – M36 · ISO 898-1 4.6 / 5.6 / 8.8 · IS 5624

For projects specified in metric, made to drawing with metric threads, nuts and washers.

Stainless & Duplex J Bolts

304 · 316 · 2205

For marine structures, water treatment plants and food factories, where zinc is not acceptable.

Where the load goes. A J or L bolt holds only by bearing of the hook. ACI 318 limits that pullout strength, and under high tension the hook can open and slip. A headed anchor rod, or a rod with a nut and plate at the bottom, bears on a flat head and engages a full cone of concrete. That is why headed anchors are preferred for heavily loaded column bases.

J bolt, L bolt or headed anchor?

Feature	J bolt	L bolt	Headed anchor
End in concrete	180° hook	90° bend	Forged head, or nut and plate
ACI 318 pullout	0.9 f′_c e_h d_a	0.9 f′_c e_h d_a	8 A_brg f′_c (usually much higher)
Typical use	Sill plates, light equipment, J hooks	Light columns, poles, tie-in to rebar	Column bases, high tension, seismic
Cost	Low	Low	Higher

Dimensions

J Bolt Dimensions, Hook Lengths & Tolerances

J bolts have no fixed catalogue size: diameter, length, thread length and hook are chosen for the job. When ordering, give D, L, T and the hook, and we bend to that drawing within the F1554 tolerances below.

Size	Hook e_h min 3 d_a, in	Hook e_h credited max 4.5 d_a, in	Pullout N_p, 3,000 psi e_h = 4.5 d_a, cracked, lbf	Steel N_sa, Gr 36 lbf	Steel N_sa, Gr 55 lbf	N_p / N_sa Gr 36
1/2″	1.50	2.25	3,000	8,200	10,600	37 %
5/8″	1.88	2.81	4,700	13,100	17,000	36 %
3/4″	2.25	3.38	6,800	19,400	25,100	35 %
7/8″	2.62	3.94	9,300	26,800	34,600	35 %
1″	3.00	4.50	12,200	35,100	45,400	35 %
1-1/8″	3.38	5.06	15,400	44,300	57,200	35 %
1-1/4″	3.75	5.62	19,000	56,200	72,700	34 %
1-1/2″	4.50	6.75	27,300	81,500	105,400	34 %

Our calculation with the ACI 318 hooked-bolt equations (nominal values, cracked concrete, no strength reduction factors). Hooks shorter than 3 d_a are outside the ACI rule, and hook length beyond 4.5 d_a is not credited. The last column shows that pullout, not the steel, usually limits a J bolt.

Feature	F1554 tolerance (bent bolts)
Length L	±½″ up to 24″ long; ±1″ over 24″. Measured from the inside of the bend to the end of the thread
Hook length	±10 % of the specified hook, or ±½″, whichever is greater
Bend angle	±5° from the specified angle
Thread length T	+1″ / −0″
Thread	UNC (8UN over 1″ when specified), class 1A or 2A

Grades

ASTM F1554 Grades for J Bolts

F1554 is the US specification for anchor rods: straight, bent (J and L) or headed. It has three strength grades, each identified by a paint colour on the projecting end.

Grade	Tensile strength ksi (MPa)	Yield min ksi (MPa)	Elongation in 2 in, % min	Reduction of area % min	Diameter in	End colour	Permanent mark (S3)	Nut ASTM A563
Grade 36	58–80 (400–552)	36 (248)	23	40	½ to 4	Blue	AB36	Grade A hex (heavy hex over 1½″)
Grade 55	75–95 (517–655)	55 (379)	21	30	½ to 4	Yellow	AB55	Grade A hex / heavy hex
Grade 105	125–150 (862–1034)	105 (724)	15	45	½ to 3	Red	AB105	Grade DH heavy hex

Grade 55 with supplementary requirement S1 has a carbon-equivalent limit so that it can be welded; it is marked yellow on the projecting end and white on the embedded end. Charpy impact testing (S4) is available for Grades 55 and 105.

Minimum tensile and yield loads, UNC threads

Size	Threads / in	Stress area in²	Gr 36 tensile min, lbf	Gr 36 yield min, lbf	Gr 55 tensile min, lbf	Gr 55 yield min, lbf	Gr 105 tensile min, lbf	Gr 105 yield min, lbf
1/2″	13	0.1419	8,200	5,100	10,600	7,800	17,700	14,900
5/8″	11	0.2260	13,100	8,100	17,000	12,400	28,300	23,700
3/4″	10	0.3345	19,400	12,000	25,100	18,400	41,800	35,100
7/8″	9	0.4617	26,800	16,600	34,600	25,400	57,700	48,500
1″	8	0.6057	35,100	21,800	45,400	33,300	75,700	63,600
1-1/8″	7	0.7633	44,300	27,500	57,200	42,000	95,400	80,100
1-1/4″	7	0.9691	56,200	34,900	72,700	53,300	121,100	101,800
1-1/2″	6	1.4053	81,500	50,600	105,400	77,300	175,700	147,600

Our calculation: ASME B1.1 tensile stress area times the F1554 minimum tensile and yield strengths. It agrees with published F1554 load tables within rounding (under 0.5 %).

Pullout

J Bolt Pullout Strength Calculator (ACI 318)

Compare the concrete pullout of the hook with the tensile strength of the rod. For a J or L bolt, ACI 318 gives N_p = 0.9 f′_c e_h d_a, with 3 d_a ≤ e_h ≤ 4.5 d_a. The steel strength is N_sa = A_se,N f_uta.

Hooked bolt check

Bolt diameter

F1554 grade

Concrete f′c

Hook e_h, in

Concrete condition

Nominal strengths only. Strength reduction factors, concrete breakout, side-face and edge effects, and load combinations are not included, so a qualified engineer must complete the anchor design.

Result for 3/4″ Grade 36

6,075

lb pullout N_p

(27.0 kN)

19,401

lb steel N_sa

(86.3 kN)

Hook range credited:2.25 – 3.38 in

e_h used:3.00 in

Governs:Pullout (31 % of steel)

Installation

Setting J Bolts in Concrete

J bolts are cast in when the concrete is placed, so they must be set accurately in a template before the pour.

Sill-plate anchorage under IRC R403.1.6 (2018). Use ½″ or larger bolts embedded at least 7″ in concrete or grouted masonry, no more than 6 ft apart, with a bolt within 12″ of every wall corner and plate splice, and washers under the nuts. Local amendments and engineered designs can be stricter.

Do

Hold bolts in a template so position and projection are right before the pour
Point the hook into the body of the footing, away from the edge
Protect the thread with tape or a sleeve during concreting
Vibrate the concrete around the hook so it is fully bedded

Don't

Push J bolts into concrete after it is placed (“wet setting”) unless your code and engineer allow it
Bend or straighten a cast-in bolt to correct position, especially Grade 105
Weld to Grade 36, 55 or 105 rods unless they are Grade 55 S1 weldable
Rely on a J bolt for high tension without an engineer's check

Materials & finishes

J Bolt Materials & Finishes

Grade 36

Low / medium carbon bar

Ductile and easy to bend cold, so it is the standard J bolt material.

1018 1022

Grade 55

HSLA / carbon bar

Higher strength; S1 weldable chemistry on request.

1035 Medium carbon steels

Grade 105

Q&T alloy bar

Quenched and tempered Cr-Mo steel such as 4140 for the highest loads.

4140 4137

304

General stainless

J hook bolts and anchors in food plants and indoor wet areas.

AISI 304

316

Marine & chemical

Coastal structures, jetties and water treatment.

AISI 316 316L

Duplex 2205

High strength stainless

Severe chloride exposure with higher yield than 316.

2205

Finish	Specification	Notes
Plain (black)	–	For bolts fully encased and protected; the projecting end is painted with the structure
Hot-dip galvanized	ASTM A153 Class C / ASTM F2329	Galvanized after bending; nuts over-tapped to ASTM A563 to suit the zinc
Partial galvanizing	Projecting end only	Where the embedded end must stay bare for bond with the concrete, by agreement
Passivated stainless	ASTM A967 / A380	304, 316 and duplex J bolts

Special alloy J bolts: minimum properties of the bar we make them from

Alloy	UNS	Condition supplied	Tensile min MPa	Yield 0.2 % min MPa	Elongation %	Why it is chosen for hex bolts
Inconel 625	N06625	Solution annealed (Grade 1)	827	414	30	Seawater, sour gas, cryogenic to 980 °C oxidation; subsea flange bolting
Inconel 718	N07718	Solution treated + aged (AMS 5662)	1240	1035	12	Highest strength to 650 °C; turbine and wellhead bolting
Monel 400	N04400	Hot-finished annealed	517	207	35	Seawater, hydrofluoric acid, no chloride SCC; marine and valve bolting
Monel K-500	N05500	Age hardened (AMS 4676)	960	690	18	Monel 400 corrosion resistance with three times the yield; pump shafts, subsea
Hastelloy C-276	N10276	Solution annealed (ASTM B574)	690	283	40	Wet chlorine, hot acids, mixed oxidising / reducing media; chemical reactors
Incoloy 825	N08825	Annealed (ASTM B425)	586	241	30	Sulphuric and phosphoric acid, sour gas (NACE MR0175); pickling plant
Duplex 2205	S32205	Solution annealed	655	450	25	Twice the yield of 316 with chloride SCC resistance; offshore topsides
Super Duplex 2507	S32750	Solution annealed	750	550	15	PREN > 40; seawater and desalination bolting
Titanium Grade 5	R56400	Annealed (ASTM B348)	895	828	10	Half the weight of steel, immune to seawater; aerospace and chemical
A-286	S66286	Solution treated + aged	—	—	—	Iron-base superalloy for 650 °C bolting; on request with certified values

Bar minimums from the linked datasheets for the supply condition shown. Stainless and nickel alloy J bolts fall outside ASTM F1554 and are certified to the bar or an agreed fastener specification.

Manufacturing

How Our J Bolts Are Made

1

Certified bar

Round bar received by heat with mill certificates, checked against the grade chemistry and cut to developed length.

2

Threading

Threads rolled on reduced-diameter blanks or cut on full-diameter bar, to UNC 1A / 2A or metric 6g.

3

Bending

Hooks formed on a bending former to the drawing radius and hook length, then checked against the bend-angle and hook tolerances.

4

Heat treatment

Grade 105 bar is quenched and tempered, and test specimens from the same heat-treatment lot confirm its properties.

5

Galvanizing & marking

Hot-dip galvanized after bending when ordered; projecting end painted in the grade colour.

6

Kitting

Nuts and washers matched to grade and coating, bagged and bundled with each size.

Applications

Where Our J Bolts Are Used

House & garage foundations

Anchoring sill plates and wall plates to foundations and slabs.

Light poles & signs

Pole bases, sign structures and fence posts on concrete piers.

Equipment pads

Holding down pumps, generators, HVAC units and small tanks.

Pre-engineered buildings

Light columns and girts in sheds, canopies and farm buildings.

Pipe & cable supports

Stainless J hook bolts hanging pipes, conduits and cable trays.

Roofing & solar

J hook bolts fixing roof sheets and solar rails to steel purlins.

Quality & testing

J Bolt Testing & Certification

Test	Method	Applied to
Chemistry	Mill certificate; PMI on stainless	Every heat
Tensile, yield, elongation, RA	ASTM F1554 / A370 on bar or machined specimens	Every heat and size range; every heat-treatment lot for Grade 105
Charpy impact	F1554 S4	Grades 55 and 105 on request
Dimensions	Length, hook, bend angle, thread length	Every lot, to F1554 tolerances
Thread	Ring gauges, after galvanizing for HDG bolts	Every lot
Coating	Magnetic thickness gauge	Every galvanized lot

Every shipment includes

Mill certificates with heat numbers
F1554 test report per grade
Dimensional report against your drawing
Coating report for galvanized bolts

On request

EN 10204 3.1 / 3.2 certificates
Charpy (S4) and permanent grade marking (S3)
Third-party inspection

FAQ

J Bolt Questions, Answered

A J bolt is a steel rod threaded at one end and bent into a J at the other. Cast into concrete, the hook anchors the bolt so that a nut on the threaded end can hold down a sill plate, column base or equipment. In the US, structural J anchor bolts are made to ASTM F1554. Smaller J bolts with a nut are also used as hooks for pipes, roofing sheets and cables.

A J bolt ends in a curved hook and an L bolt in a 90 degree bend; ACI 318 treats both as hooked bolts with the same pullout rule. A headed anchor bolt has a forged head or a nut and plate at the bottom, which bears directly on the concrete. Hooks can straighten under high tension, so headed anchors are usually chosen for heavily loaded column bases, while J bolts suit sill plates and light equipment.

Grade 36 (36 ksi yield, 58 to 80 ksi tensile, blue end) is the usual choice for J bolts and is easy to bend. Grade 55 (55 ksi yield, 75 to 95 ksi tensile, yellow) gives more strength, and Grade 55 with supplement S1 can be welded. Grade 105 (105 ksi yield, 125 to 150 ksi tensile, red) is a quenched and tempered alloy grade for high loads, up to 3 inch diameter.

Under IRC R403.1.6 (2018 edition), sill plates are anchored with bolts at least 1/2 inch in diameter, embedded at least 7 inches into concrete or grouted masonry, spaced no more than 6 feet apart, with a bolt within 12 inches of each wall corner and plate splice, and fitted with washers. Local amendments and engineered designs may require more.

For bent anchor bolts, length is measured from the inside of the bend to the end of the thread. ASTM F1554 tolerances are plus or minus 1/2 inch on length up to 24 inches long and 1 inch over, plus or minus 10 percent or 1/2 inch on the hook, plus or minus 5 degrees on the bend angle, and plus 1 inch, minus 0 on thread length.

ACI 318 limits the pullout strength of a hooked bolt to Np = 0.9 f'c eh da, where eh is the hook length from the inner face of the shank, counted between 3 and 4.5 bolt diameters. A 3/4 inch J bolt with a 3 inch hook in 3,000 psi cracked concrete has a nominal pullout strength of about 6,075 lb, far below the 19,400 lb nominal steel strength of a Grade 36 rod. Concrete breakout, edge distance and strength reduction factors must also be checked.

Galvanize them where the projecting end is exposed to weather, or where treated lumber or coastal air is involved. We hot-dip galvanize to ASTM A153 Class C or F2329 after bending and supply over-tapped ASTM A563 nuts to suit the zinc thickness. Grade 105 rods need care in galvanizing and are checked case by case.

No. ASTM F1554 covers carbon, carbon-boron, alloy and high-strength low-alloy steel anchor rods only. Stainless J bolts are made from 304 or 316 bar, with properties certified to the bar specification or to an agreed stainless fastener specification such as ASTM F593. They are used for food plants, marine work and where galvanizing is not acceptable.