Carbon Steel Hollow Bar Manufacturer and Supplier in Bangkok, Thailand

Carbon Steel Hollow Bar

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Phanuphong Steel and Plates is a reputable manufacturer and supplier of Carbon Steel Hollow Bars, proudly based in Bangkok, Thailand. With a strong focus on precision engineering and unwavering quality, the company provides hollow bar solutions tailored to meet the structural and machining demands of various industries. Their carbon steel hollow bars are celebrated for their impressive strength, precise dimensions, and outstanding machinability. Phanuphong Steel caters to a wide range of customers across sectors like construction, automotive, and heavy equipment manufacturing, ensuring prompt delivery and reliable service throughout Thailand and neighboring Southeast Asian markets.

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Carbon Steel Hollow Bars

ASTM A105 CS Hollow Bars

ASME SA105 CS Hollow Rods

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What is Carbon Steel Hollow Bar?

Phanuphong’s Carbon Steel Hollow Bars are generally made from medium carbon steels such as AISI 1020, 1045, or similar, containing carbon (0.20%–0.45%) and manganese (0.50%–0.90%), along with small amounts of silicon, phosphorus, and sulfur. These bars strike a great balance between strength and machinability, boasting tensile strength from 400–650 MPa and yield strength between 250–350 MPa. They also exhibit excellent toughness and moderate elongation (15–25%). The hollow design helps reduce weight while preserving mechanical integrity, making them perfect for applications that require strength, efficient material use, and easy internal machining or threading.

Carbon Steel Hollow Bar Specifications

Standard	ASTM A105, ASME SA105
Dimensions	EN, DIN, JIS, ASTM, BS, ASME, AISI
Round bar Size	Diameter: 3-~800mm
Hex Bar Size	2-100mm A/F
Square Bar Size	4 to 100mm
Angle Bar Size	3mm20mm20mm~12mm100mm100mm
Rectangular Bars Section	3.0 to 12.0mm thickness
Channel Bar	80 x 40mm to 150 x 75mm section; 5.0 to 6.0mm thickness
Hollow Bar	32mm OD x 16mm ID to 250mm OD x 200mm ID)
Threaded Bar Billet Size	1/2 to 495mm Diameter
Rectangular Size	33 x 30mm to 295 x 1066mm
Finish	Cold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed, Rough Turned, Bright, Polish, Grinding, Centreless Ground & Black
Tolerance	H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements
Surface	Bright, Hot Rolled Pickled, Cold Drawn, Sand Blasting Finished, Polished, Hairline
Condition	Hardened & tempered, annealed
Technique	Hot Rolled, Cold Drawn, Cold Rolled, Forged Round Bar, Rod
Processing	Bar cutting to 650mm
Form	Round, Rod, T-Bar, Channel Bar, Precision Ground Bar, Square, Blocks, Round Rod, Rings, Hollow, Triangle, Rectangle, Hex (A/F), Threaded, Half Round Bar, Profiles, Billet, Ingot, I/H Bar, Forging etc.

If You Are Looking To Buy High Quality Pipes, Sheet, Fittings and Flanges

We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.

Top Manufacturer and Supplier of Carbon Steel Hollow Bar in Bangkok, Thailand

Phanuphong Steel is a trusted manufacturer and supplier of high-quality Carbon Steel Hollow Bar in Bangkok, Thailand. We specialize in premium steel products, including Carbon Steel, Alloy Steel, Mild Steel, and Galvanized Steel. Our extensive inventory also includes Pipes, Tubes, Flanges, Forged Fittings, Sheets, and Plates. Committed to fast delivery and exceptional customer service, we use only the finest raw materials to ensure superior strength, durability, and performance in critical industrial applications.

CS HOLLOW BAR SIZE CHART

Size		Chucked true to OD				Chucked true to ID
OD, mm	ID, mm	Max. OD, mm	Min. ID, mm	Max. OD, in.	Min. ID, in.	Max. OD, mm	Min. ID, mm	Max. OD, in.	Min. ID, in.
32	20	31	21.9	1.220	0.862	30	21	1.185	0.827
32	16	31	18	1.220	0.709	30	17	1.181	0.669
36	25	35	26.9	1.378	1.059	34.1	26	1.343	1.024
36	20	35	22	1.378	0.866	34	21	1.339	0.827
36	16	35	18.1	1.378	0.713	33.9	17	1.335	0.669
40	28	39	29.9	1.535	1.177	38.1	29	1.500	1.142
40	25	39	27	1.535	1.063	38	26	1.496	1.024
40	20	39	22.1	1.535	0.870	37.9	21	1.492	0.827
45	32	44	33.9	1.732	1.335	43.1	33	1.697	1.299
45	28	44	30	1.732	1.181	43	29	1.693	1.142
45	20	44	22.2	1.732	0.874	42.8	21	1.685	0.827
50	36	49	38	1.929	1.496	48	37	1.890	1.457
50	32	49	34.1	1.929	1.343	47.9	33	1.886	1.299
50	25	49	27.2	1.929	1.071	47.8	26	1.882	1.024
56	40	55	42	2.165	1.654	54	41	2.126	1.614
56	36	55	38.1	2.165	1.500	53.9	37	2.122	1.457
56	28	55	30.3	2.165	1.193	53.7	29	2.114	1.142
63	50	62	51.9	2.441	2.043	61.1	51	2.406	2.008
63	45	62	47	2.441	1.850	61	46	2.402	1.811
63	40	62	42.2	2.441	1.661	60.8	41	2.394	1.614
63	36	62	38.3	2.441	1.508	60.7	37	2.390	1.457
63	32	62	34.4	2.441	1.354	60.6	33	2.386	1.299
71	56	69.9	58	2.752	2.283	68.9	57	2.713	2.244
71	45	69.9	47.3	2.752	1.862	68.6	46	2.701	1.811
71	40	69.9	42.4	2.752	1.669	68.5	41	2.697	1.614
71	36	69.9	38.5	2.752	1.516	68.4	37	2.693	1.457
75	60	73.8	62	2.906	2.441	72.8	61	2.866	2.402
75	50	73.8	52.2	2.906	2.055	72.6	51	2.858	2.008
75	40	73.8	42.5	2.906	1.673	72.3	41	2.846	1.614
80	63	78.8	65	3.102	2.559	77.8	64	3.063	2.520
80	50	78.8	52.4	3.102	2.053	77.4	51	3.047	2.008
80	45	78.8	47.5	3.102	1.870	77.3	46	3.043	1.811
80	40	78.8	42.6	3.102	1.677	77.2	41	3.039	1.614
85	67	83.7	69.1	3.295	2.720	82.6	68	3.252	2.677
85	55	83.7	57.4	3.295	2.260	82.3	56.0	3.240	2.205
85	45	83.7	47.6	3.295	1.874	82.1	46.0	3.232	1.811
90	71	88.6	73.1	3.488	2.878	87.6	72.1	3.449	2.839
90	63	88.6	65.3	3.488	2.571	87.3	64.0	3.437	2.520
90	56	88.6	58.5	3.488	2.303	87.1	57.0	3.429	2.244
90	50	88.6	52.6	3.488	2.071	87.0	51.0	3.425	2.008
95	75	93.5	77.3	3.681	3.041	92.4	76.2	3.641	2.997
95	67	93.5	69.3	3.681	2.728	92.2	68.0	3.630	2.677
95	50	93.5	52.7	3.681	2.075	91.8	51.0	3.614	2.008
100	80	98.5	82.3	3.878	3.240	97.4	81.2	3.835	3.197
100	71	98.5	73.4	3.878	2.890	97.2	72.1	3.827	2.839
100	63	98.5	65.5	3.878	2.579	97.0	64.0	3.819	2.520
100	56	98.5	58.7	3.878	2.311	96.8	57.0	3.811	2.244
106	80	104.4	82.5	4.110	3.248	103.1	81.2	4.059	3.197
106	71	104.4	73.5	4.110	2.894	103.0	72.1	4.055	2.839
106	63	104.4	65.7	4.110	2.587	102.7	64.0	4.043	2.520
106	56	104.4	58.9	4.110	2.319	102.5	57.0	4.035	2.244
112	90	110.3	92.5	4.343	3.642	109.2	91.4	4.299	3.598
112	80	110.3	82.6	4.343	3.252	108.9	81.2	4.287	3.197
112	71	110.3	73.7	4.343	2.902	108.7	72.1	4.280	2.839
112	63	110.3	65.8	4.343	2.591	108.5	64.0	4.272	2.520
118	90	116.2	92.7	4.575	3.650	114.9	91.4	4.524	3.598
118	80	116.2	82.8	4.575	3.260	114.6	81.2	4.512	3.197
118	71	116.2	73.8	4.575	2.906	114.5	72.1	4.508	2.839
118	63	116.2	66.0	4.575	2.598	114.2	64.0	4.496	2.520
125	100	123.1	102.7	4.846	4.043	121.9	101.5	4.799	3.996
125	90	123.1	92.8	4.846	3.654	121.7	91.4	4.791	3.598
125	80	123.1	82.9	4.846	3.264	121.4	81.2	4.780	3.197
125	71	123.1	74.0	4.846	2.913	121.3	72.1	4.772	2.839
132	106	130.0	108.8	5.118	4.283	128.8	107.6	5.071	4.236
132	90	130.0	93.0	5.118	3.661	128.4	91.4	5.055	3.598
132	80	130.0	83.1	5.118	3.272	128.1	81.2	5.043	3.197
132	71	130.0	74.2	5.118	2.921	121.2	72.1	5.035	2.839
140	112	137.9	115	5.429	4.528	136.6	113.7	5.378	4.476
140	100	137.9	103.1	5.429	4.059	136.3	101.5	5.366	3.996
140	90	137.9	93.2	5.429	3.669	136.1	91.4	5.358	3.598
140	80	137.9	83.3	5.429	3.280	135.8	81.2	5.346	3.197
150	125	147.7	128.1	5.815	5.043	146.5	126.9	5.768	4.996
150	106	147.7	109.3	5.815	4.303	146	107.6	5.748	4.236
150	95	147.7	98.4	5.815	3.874	145.7	96.4	5.736	3.795
150	80	147.7	83.6	5.815	3.291	145.3	81.2	5.720	3.197
160	132	157.6	135.3	6.205	5.327	156.3	134	6.154	5.276
160	122	157.6	125.4	6.205	4.937	156	123.8	6.142	4.874
160	112	157.6	115.5	6.205	4.547	155.8	113.7	6.134	4.476
160	90	157.6	94.0	6.205	3.701	155.2	91.4	6.110	3.598
170	140	167.4	143.5	6.591	5.650	166	142.1	6.535	5.594
170	130	167.4	133.6	6.591	5.260	165.8	132	6.528	5.197
170	128	167.4	131.6	6.591	5.181	165.7	130	6.524	5.118
170	118	167.4	121.7	6.591	4.791	165.5	119.8	6.516	4.717
170	106	167.4	109.8	6.591	4.323	165.2	107.6	6.504	4.236
170	100	167.4	103.9	6.591	4.091	165	101.5	6.496	3.996
180	150	177.3	153.6	6.980	6.047	176	152.3	6.929	5.996
180	140	177.3	143.7	6.980	5.657	175.7	142.1	6.917	5.594
180	125	177.3	128.9	6.980	5.075	175.3	126.9	6.902	4.996
180	100	177.3	104.1	6.980	4.098	174.7	101.5	6.878	3.996
190	160	187.1	163.8	7.366	6.449	185.7	162.4	7.311	6.394
190	150	187.1	153.9	7.366	6.059	185.5	152.3	7.303	5.996
190	132	187.1	136	7.366	5.354	185.1	134	7.287	5.276
200	170	197.0	173.9	7.756	6.846	195.6	172.6	7.701	6.795
200	160	197.0	164	7.756	6.457	195.4	162.4	7.693	6.394
200	150	197.0	154.1	7.756	6.067	195.2	152.3	7.685	5.996
200	140	197.0	144.2	7.756	5.677	194.9	142.1	7.673	5.594
212	170	208.8	174.2	8.220	6.858	207.2	172.6	8.157	6.795
212	150	208.8	154.4	8.220	6.079	206.6	152.3	8.133	5.997
212	130	208.8	134.6	8.220	5.299	206.2	132	8.118	5.197
224	180	220.6	184.4	8.685	7.260	218.9	182.7	8.618	7.193
224	140	220.6	144.8	8.685	5.701	217.9	142.1	8.579	5.594
236	190	232.4	194.6	9.150	7.661	230.7	192.9	9.083	7.594
236	150	232.4	155.0	9.150	6.102	229.7	152.3	9.043	5.996
250	200	246.2	204.9	9.693	8.067	244.3	203.0	9.618	7.992
275	200	268.9	205.4	10.587	8.087	266.5	203.0	10.492	7.992

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Types of Carbon Steel Hollow Bar

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Uses of Carbon Steel Hollow Bar

Carbon Steel Hollow Bars find extensive use in industries that demand both strength and efficient material utilization. They are commonly used in the production of hydraulic cylinders, rollers, bushings, drive shafts, and structural supports. In construction and mining, hollow bars are favored for load-bearing components where lighter weight is advantageous. Their machinability makes them ideal for precision parts in the automotive and mechanical engineering fields. Additionally, they are utilized in fabrication projects that require internal threading or machining.