MS Rectangular Hollow Section (RHS) — High-Strength Structural Steel | Besi Kotak Tepat

MS Rectangular Hollow Section (RHS) — High-Strength Structural Steel | Besi Kotak Tepat

 

Mild Steel Rectangular Hollow Section (RHS) is a cold-formed structural steel profile engineered for high-load framing and architectural support in Malaysian construction and industrial projects. Designed for superior weldability and torsional strength, RHS serves as the primary structural component for building frames, trusses, and infrastructure across Peninsular Malaysia.

PRODUCT DESCRIPTION

• For Project Managers and Main Contractors in Malaysia, the primary challenge lies in selecting structural members that balance weight-to-strength ratios with long-term durability. Standard profiles often fail under high-stress loads or succumb to rapid oxidation in high-humidity environments like the East Coast or Klang Valley.
• Our Mild Steel Rectangular Hollow Section (RHS) (Besi Kotak Tepat) is the engineered solution for modern structural framing. Unlike open sections (such as C-Channels), the closed-loop geometry of the RHS provides exceptional Torsional Resistance (Rintangan Kilasan), making it indispensable for cantilevered structures and heavy-load trusses. The flat surfaces allow for easy joining and architectural finishing, while the uniform wall thickness ensures predictable load-bearing performance under JKR-spec requirements.

Key Technical Features

• High Strength-to-Weight Ratio: Optimizes structural efficiency, reducing overall foundation loads in multi-story projects.
• Superior Weldability (Mudah Dikimpal): Low carbon content ensures clean, deep-penetration welds without cracking.
• Flat-Surface Geometry: Simplifies bolting and welding to other structural members, reducing labor time on-site.
• Industry Standard Compliant: Manufactured to meet rigorous internal quality controls for structural safety.

Applications & Benefits

• Infrastructure (JKR/TNB): Used for overhead sign gantries and substation framing. Benefit: High structural reliability and regulatory compliance.
• Industrial (Factories/Warehouses): Primary support columns and roof trusses. Benefit: Heavy-duty protection and large-span capability.
• Residential (Housing Projects): Visible architectural framing and gate structures. Benefit: Clean aesthetics combined with high security.
• Coastal Regions (East Coast): When treated with protective coatings, provides excellent High Humidity Resistance. Benefit: Reduced maintenance cycles in saline environments.

Technical Specifications Table

Specification	Detail
Compliance	Industry Standard Compliant
Material Grade	Structural Grade Mild Steel (Besi Tahan Lasak)
Surface Finish	Mill Finish / Lightly Oiled (Ready for Coating)
Corrosion Protection	High Rust Resistance (Tahan Karat) when Primed
Common Sizes	1 \times 2 inch, 2 \times 3 inch, 2 \times 4 inch up to Heavy Duty Specs

 

STM A 500 Grades A and B / Manufacturer’s Standard
Nominal Size		Dimensions					Area	Moment of Inertia		Section Modulus		Radius of Gyration		Plastic Modulus
		Wall Thinkness		Calculated Weight				Ix	Iy	zx	zy	ix	iy	Sx	Sy
mm	in	mm	in	Kg/m	Kg/6m	Kg/ft	in²	in4	in4	in³	in³	in	in	in³	in³
38 x 19	1 1/2 x 3/4	1.0	0.039	0.857	5.142	0.261	0.167	0.0499	0.0168	0.0668	0.0448	0.5412	0.3136	0.0824	0.0506
		1.2	0.047	1.020	6.120	0.311	0.197	0.0588	0.0196	0.0786	0.0524	0.5380	0.3105	0.0976	0.0596
		1.5	0.059	1.260	7.560	0.384	0.242	0.0714	0.0235	0.0954	0.0628	0.5332	0.3058	0.1195	0.0726

 

50  x 25	2×1	1.0	0.039	1.140	6.840	0.347	0.222	0.1164	0.0395	0.1183	0.0802	0.7172	0.4177	0.1451	0.0894
		1.2	0.047	1.360	8.160	0.415	0.264	0.1377	0.0464	0.1399	0.0943	0.7139	0.4145	0.1723	0.1058
		1..5	0.059	1.690	10.140	0.515	0.326	0.1684	0.0562	0.1710	0.1142	0.7091	0.4098	0.2121	0.1297
		2.3	0.091	2.500	15.000	0.762	0.481	0.2435	0.0792	0.2474	0.1610	0.6964	0.3973	0.3120	0.1885
		3.0	0.120	3.190	19.140	0.972	0.606	0.3016	0.0960	0.3064	0.1951	0.6856	0.3868	0.3923	0.2344

 

65 x 38	2 1/2 x 1 1/2	1.5	0.059	2.330	13.980	0.710	0.456	0.4193	0.1819	0.3277	0.2431	0.9496	0.6254	0.3968	0.2732
		1.9	0.075	2.900	17.400	0.884	0.570	0.5198	0.2239	0.4063	0.2994	0.9432	0.6191	0.4951	0.3399
		2.3	0.091	3.480	20.880	1.601	0.680	0.6159	0.2635	0.4813	0.3523	0.9369	0.6129	0.5904	0.4040
		3.0	0.120	4.390	26.340	1.338	0.866	0.7735	0.3270	0.6045	0.4372	0.9260	0.6021	0.7500	0.5102

 

75 x 38	3 x 1 1/2	1.5	0.059	2.570	15.420	0.783	0.503	0.5941	0.2059	0.4024	0.2752	1.0778	0.6345	0.4929	0.3066
		1.9	0.075	3.180	19.080	0.969	0.629	0.7382	0.2537	0.5000	0.3392	1.0713	0.6281	0.6160	0.3817
		2.3	0.091	3.810	22.860	1.161	0.752	0.8764	0.2988	0.5936	0.3994	1.0649	0.6217	0.7356	0.4541
		3.0	0.120	4.860	29.160	1.481	0.959	1.1049	0.3713	0.7484	0.4963	1.0537	0.6108	0.9367	0.5743

 

75 x 50	3×2	1.9	0.075	3.540	21.240	1.079	0.699	0.8846	0.4713	0.5991	0.4788	1.1131	0.8125	0.7177	0.5420
		2.3	0.091	4.240	25.440	1.292	0.837	1.0517	0.5580	0.7124	0.5670	1.1069	0.8062	0.8580	0.6468
		3.0	0.120	5.420	32.520	1.652	1.071	1.3293	0.7002	0.9004	0.7114	1.0959	0.7954	1.0949	0.8225
		4.0	0.156	7.020	42.120	2.140	1.387	1.6941	0.8831	1.1475	0.8973	1.0806	0.7802	1.4144	1.0574
		4.5	0.177	7.790	46.740	2.374	1.537	1.8632	0.9663	1.2620	0.9817	1.0370	0.7727	1.5661	1.1679
		5.0	0.197	8.520	51.120	2.600	1.683	2.0239	1.0441	1.3708	1.0608	1.0656	0.7653	1.7125	1.2739
		6.0	0.236	9.920	59.520	3.023	1.958	2.3208	1.1849	1.5720	1.2038	1.0508	0.7508	1.9898	1.4726

 

100×50	4×2	1.9	0.075	4.290	25.740	1.308	0.847	1.7757	0.6034	0.9021	0.6130	1.4360	0.8371	1.1052	0.6814
		2.3	0.091	5.140	30.840	1.567	1.016	2.1185	0.7153	1.0762	0.7267	1.4295	0.8206	1.3243	0.8141
		3.0	0.120	6.600	39.600	2.012	1.303	2.6937	0.8995	1.3684	0.9139	1.4182	0.8195	1.6967	1.0376
		4.0	0.156	8.590	51.540	2.618	1.697	3.4626	1.1380	1.7590	1.1562	1.4023	0.8039	2.2047	1.3381

 

125×50	5×2	2.3	0.091	6.046	36.276	1.843	1.194	3.6874	0.8726	1.4986	0.8865	1.7421	0.8475	1.8784	0.9815
		3.0	0.120	7.780	46.680	2.371	1.536	4.7068	1.0988	1.9128	1.1163	1.7305	0.8361	2.4130	1.2528
		4.0	0.156	10.200	61.200	3.109	2.007	6.0841	1.3928	2.4726	1.4151	1.7141	0.8201	3.1475	1.6188
		4.5	0.177	11.300	67.800	3.444	2.235	6.7389	1.5276	2.7387	1.5521	1.7059	0.8122	3.5021	1.7926
		5.0	0.197	12.400	74.400	3.799	2.458	7.3720	1.6547	2.9960	1.6812	1.6978	0.8044	3.8483	1.9604
		6.0	0.236	14.600	87.600	4.450	2.888	8.5742	1.8869	3.4846	1.9171	1.6817	0.7889	4.5162	2.2781

 

150×50	6×2	3.0	0.120	8.960	52.760	2.731	1.768	7.4812	1.2981	2.5336	1.3188	2.0363	0.8482	3.2437	1.4679
		4.0	0.156	11.700	70.200	3.566	2.317	9.7085	1.6476	3.2880	1.6740	2.0794	0.8319	4.2429	1.8995
		4.5	0.177	13.100	78.600	3.993	2.584	10.7748	1.8083	3.6491	1.8372	2.0109	0.8238	4.7275	2.1050
		5.0	0.197	14.400	86.400	4.389	2.845	11.8103	1.9600	3.9998	1.9914	2.0026	0.8158	5.2023	2.3036
		6.0	0.236	17.000	102.00	5.181	3.353	13.7911	2.2379	4.6706	2.2737	1.9859	0.8000	6.1226	2.6809

 

100×75	4×3	3.0	0.120	7.780	46.680	2.371	1.536	3.5416	2.2689	1.7992	1.5334	1.5011	1.2002	2.1407	1.7539
		4.0	0.156	10.200	61.200	3.109	2.007	4.5704	2.9065	2.3217	1.9687	1.4856	1.1847	2.7905	2.2809
		4.5	0.177	11.300	67.800	3.444	2.235	5.0581	3.2084	2.5695	2.1732	1.4779	1.1771	3.1039	2.5341
		5.0	0.197	12.400	74.400	3.779	2.458	5.5288	3.4979	2.8086	2.3692	1.4703	1.1695	3.4097	2.7804
		6.0	0.236	14.600	87.600	4.450	2.888	6.4202	4.0409	3.2614	2.7370	1.4552	1.1546	3.9990	3.2530

 

125×75	5×3	3.0	0.120	8.960	53.760	2.731	1.768	6.0480	2.7312	2.4579	1.8499	1.8309	1.2304	2.9713	2.0834
		4.0	0.156	11.700	70.200	3.566	2.317	7.8435	3.5127	3.1876	2.3793	1.8151	1.2147	3.8859	2.7142
		4.5	0.177	13.100	78.600	3.993	2.584	8.7021	3.8810	3.5356	2.6287	1.8072	1.2069	4.3293	3.0181
		5.0	0.197	14.400	86.400	4.389	2.845	9.5355	4.2349	3.8752	2.8685	1.7994	1.1992	4.7637	3.3144
		6.0	0.236	17.000	102.000	5.181	3.353	11.1280	4.9009	4.5224	3.3196	1.7839	1.1839	5.6055	3.8846

 

150×75	6×3	3.0	0.120	10.100	60.600	3.078	2.001	9.4283	3.1985	3.1930	2.1665	2.1516	1.2532	3.9164	2.4130
		4.0	0.156	13.300	79.800	4.054	2.627	12.2698	4.1189	4.1554	2.7899	2.1354	1.2372	2.1338	3.1475
		4.5	0.177	14.900	89.400	4.541	2.932	13.6367	4.5536	4.6183	3.0843	2.1274	1.2293	5.7264	3.5021
		5.0	0.197	16.400	98.400	4.998	3.233	14.9686	4.9719	5.0694	3.3677	2.1194	1.2215	6.3038	3.8483
		6.0	0.236	19.300	115.800	5.882	3.818	17.5296	5.7610	5.9367	3.9021	2.1035	1.2095	7.4407	4.5162
		9.0	0.354	27.600	165.600	8.412	5.452	24.4309	7.7753	8.2739	5.2665	2.0268	1.1603	10.5927	6.3294

 

50×100	6×4	3.0	0.120	11.311	67.866	3.447	2.233	11.3754	6.0855	3.8525	3.0915	2.2390	1.6376	4.5892	3.4725
		4.0	0.156	14.900	89.400	4.541	2.937	14.8310	7.8935	5.0228	4.0099	2.2231	1.6219	6.0248	4.5480
		4.5	0.177	16.600	99.600	5.059	3.281	16.4986	8.7584	5.5875	4.4493	2.2153	1.6141	6.7253	5.0708
		5.0	0.197	18.300	109.800	5.578	3.620	18.1269	9.5980	6.1390	4.8758	2.2074	1.6063	7.4144	5.5837
		6.0	0.236	21.700	130.200	6.614	4.283	21.2681	11.203	17.2028	5.6912	2.1919	1.5908	8.7589	6.5803
		9.0	0.354	31.100	186.600	9.479	6.150	29.8117	15.4600	10.0932	7.8537	2.1461	1.5455	12.5287	9.3432

 

200×100	8×4	4.0	0.156	18.000	108.000	5.486	3.557	29.7980	10.1089	7.5687	5.1353	2.8687	1.6709	9.2834	5.1960
		4.5	0.177	20.200	121.200	6.157	3.979	33.2194	11.2253	8.4377	5.7025	2.8606	1.6629	10.3775	6.3820
		5.0	0.197	22.300	133.800	6.797	4.395	36.5762	12.3109	9.2904	6.2539	2.8526	1.6549	11.4572	7.0330
		6.0	0.236	26.400	158.400	8.046	5.213	43.0988	14.3917	10.9471	7.3110	2.8365	1.6391	13.5736	8.3012
		9.0	0.354	38.400	229.200	11.643	7.545	61.1954	19.9510	15.5436	10.1351	2.7889	1.5924	19.5861	11.8421
		12.0	0.472	49.100	294.600	14.965	9.693	77.2137	24.5737	19.6123	12.4834	2.7423	1.5471	25.1086	15.0031

 

200×150	8×6	4.5	0.177	23.7000	142.200	7.223	4.676	43.5515	27.9461	11.0621	9.4944	3.0258	2.4238	13.0618	10.7208
		5.0	0.197	26.200	157.200	7.985	5.170	47.9981	30.7601	12.1915	10.4174	3.0179	2.4160	14.4321	11.8386
		6.0	0.236	31.100	186.600	9.479	6.143	56.6662	36.2223	14.3932	12.2673	3.0023	2.4003	17.1252	14.0313
		9.0	0.354	45.300	271.800	13.807	8.940	80.9303	51.3348	20.5563	17.3854	2.9559	2.3542	24.8310	20.2726
		12.0	0.472	58.500	351.000	17.830	11.553	102.7225	64.6543	26.0915	21.8963	2.9104	2.3090	31.9921	26.0239

 

250×150	10×6	6.0	0.236	35.800	214.800	10.911	7.073	96.7680	43.6994	19.6633	14.7995	3.6618	2.4607	23.7707	16.6675
		9.0	0.354	52.300	313.800	15.940	10.335	139.2342	62.0963	28.2924	21.0300	3.6144	2.4138	34.6345	24.1445
		12.0	0.472	67.900	407.400	20.695	13.413	178.0479	78.4149	36.1794	26.5565	3.5678	2.3677	44.8437	31.0767

 

300×200	12×8	6.0	0.236	45.200	271.200	13.776	8.933	182.0061	97.3686	30.8197	24.7316	4.4779	3.2752	36.7138	27.7800
		9.0	0.354	66.500	399.000	20.268	13.125	263.9778	140.1351	44.7002	35.3943	4.4305	3.2281	53.8021	40.5660
		12.0	0.472	86.800	520.800	26.455	17.133	340.2904	179.2492	57.6225	45.5293	1.3838	3.1817	70.0709	52.6425

FAQ

QUESTION 1: What are the benefits of using Rectangular Hollow Section (RHS) over C-Channel for industrial warehouses in Selangor?
ANSWER 1: RHS offers superior torsional rigidity and a closed-profile design, which prevents dust accumulation and internal corrosion more effectively than open C-Channels. For warehouse frames in Selangor, Kee Maju Jaya recommends RHS for its higher load-bearing capacity and structural stability in large-span buildings.

QUESTION 2: Is Mild Steel RHS suitable for high-humidity coastal projects in Terengganu or Pahang?
ANSWER 2: Yes, Mild Steel RHS is highly suitable provided it is treated with a Hot-Dipped Galvanized (Celup Panas) finish or high-grade epoxy coating. Its flat, smooth surfaces allow for uniform coating thickness, ensuring superior resistance to the salt-spray environments of the East Coast.

QUESTION 3: Can Kee Maju Jaya provide site delivery for bulk RHS orders to Johor or Penang?
ANSWER 3: Absolutely. Kee Maju Jaya specializes in logistics for large-scale projects, offering direct site delivery to major industrial hubs including Johor, Penang, and the Klang Valley at competitive project rates.

QUESTION 4: How does RHS weldability affect construction timelines for Malaysian contractors?
ANSWER 4: Because our RHS is manufactured with high-quality Mild Steel, it offers excellent weldability (Mudah Dikimpal). This allows contractors to achieve faster assembly and stronger joints, significantly reducing on-site fabrication time and overall labor costs.

 

SOALAN 1: Apakah kelebihan menggunakan Rectangular Hollow Section (RHS) berbanding C-Channel untuk gudang industri di Selangor?
JAWAPAN 1: RHS menawarkan ketegaran kilasan (torsional rigidity) yang unggul dan reka bentuk profil tertutup yang menghalang pengumpulan habuk serta kakisan dalaman dengan lebih berkesan berbanding C-Channel. Untuk rangka gudang di Selangor, Kee Maju Jaya mengesyorkan RHS kerana kapasiti bebanannya yang lebih tinggi untuk struktur rentang besar (large-span structures).

SOALAN 2: Adakah Mild Steel RHS sesuai untuk projek pesisir pantai dengan kelembapan tinggi di Terengganu atau Pahang?
JAWAPAN 2: Ya, Mild Steel RHS sangat sesuai dengan syarat ia dirawat dengan kemasan Celup Panas (Hot-Dipped Galvanized) atau salutan epoksi gred tinggi. Permukaannya yang rata membolehkan ketebalan salutan yang sekata, memastikan rintangan tinggi terhadap persekitaran semburan garam di Pantai Timur.

SOALAN 3: Bolehkah Kee Maju Jaya menyediakan penghantaran ke tapak bina untuk pesanan pukal RHS ke Johor atau Pulau Pinang?
JAWAPAN 3: Tentu sekali. Kee Maju Jaya pakar dalam logistik untuk projek berskala besar, menawarkan penghantaran terus ke tapak bina di hab utama termasuk Johor, Pulau Pinang, dan Lembah Klang dengan kadar projek yang kompetitif.

SOALAN 4: Bagaimanakah kebolehkimpalan RHS mempengaruhi garis masa pembinaan bagi kontraktor di Malaysia?
JAWAPAN 4: Oleh kerana RHS kami dihasilkan daripada Mild Steel berkualiti tinggi, ia menawarkan kebolehkimpalan (weldability) yang cemerlang. Ini membolehkan kontraktor melakukan pemasangan dengan lebih pantas dan menghasilkan sambungan yang lebih kuat, sekaligus mengurangkan masa fabrikasi di tapak bina dan kos buruh secara signifikan.