Galvanized Iron (GI) Hollow Section — Structural Rust Resistance | Besi Hollow GI

Premium Galvanized Iron (GI) Hollow Sections engineered for maximum durability. Featuring a protective zinc barrier (Tahan Karat), these sections are the industry standard for Malaysian roof frames, fencing, and industrial structures. Available in square and rectangular profiles.

PRODUCT DESCRIPTION

Besi Hollow GI is a Galvanized Iron (GI) structural profile engineered for high-load framework applications in Malaysia’s high-humidity environments.
Main contractors and engineers often face the risk of structural degradation caused by rapid oxidation (rust) in tropical climates. Standard mild steel sections without adequate protection fail prematurely, leading to high maintenance costs and safety concerns in roofing and fencing projects.
Our GI Hollow Sections utilize a robust Galvanized Iron (Besi Berongga GI) substrate. The Hot-Dipped Galvanized (Celup Panas) process creates a metallurgical bond that serves as a sacrificial anode. This ensures that even if the surface is scratched during site installation, the structural integrity of the High-Tensile Steel (Besi Tahan Lasak) remains uncompromised by corrosion.
Kee Maju Jaya maintains consistent stock levels in standard 6-meter (20 kaki) lengths. We provide specialized logistics for site delivery to key hubs including KL, Selangor, Penang, Johor, and the East Coast, ensuring your project timeline remains on track with direct factory value.

Quick Specs

Material Grade: Galvanized Iron (GI)
Application: Roof Trusses (Purlins), Fencing Frames, Industrial Furniture.
Compatibility: Industry Standard Compliant for Malaysian Construction.

KEY TECHNICAL FEATURES

Enhanced Corrosion Resistance: The zinc-coated surface prevents oxidation (Tahan Karat), extending the lifespan of outdoor structures.
High Strength-to-Weight Ratio: Provides superior structural support for roofing purlins without adding excessive dead load.
Weldability & Fabricability: Precision-engineered for clean welding and easy integration into complex frames.
Dimensional Uniformity: Consistent wall thickness (1.0mm – 1.6mm) ensures structural calculations remain accurate across large-scale installations.

APPLICATIONS & BENEFITS

Industrial (Factories/Warehouses): Used as secondary structural members and roof purlins. Benefit: High durability and compliance with industrial safety standards.
Infrastructure (Fencing/Security): Ideal for Anti-Climb Fencing (Pagar Keselamatan) frameworks. Benefit: Long-term weather resistance reduces replacement cycles.
Coastal Areas (East Coast): Specifically selected for projects in high-salinity zones. Benefit: High Humidity Resistance (Tahan Karat) prevents salt-air degradation.
Commercial (Furniture/Racking): Used for heavy-duty tables, racks, and shelving. Benefit: Professional finish with minimal maintenance required.

TECHNICAL SPECIFICATIONS TABLE

Specification	Detail
Compliance	Industry Standard Compliant
Material/Composition	Galvanized Iron (GI) / Besi Kotak
Shape Profiles	Square (Segiempat Sama) / Rectangular (Segiempat Tepat)
Standard Length	6 Meters (20 Feet) / Custom Lengths Available
Wall Thickness	1.0mm – 1.6mm (Project Specific)
Finish/Coating	Rust Resistance Zinc Coating (Tahan Karat)

ASTM A 500 Grades A and B / Manufacturer’s Standard
Nominal Size		Dimensions					Area	Moment of Inertia		Section Modulus		Radius of Gyration		Plastic Modulus
Nominal Size		Wall Thinkness		Calculated Weight			Area	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
12 x 12	1/2 x 1/2	1.0	0.039	0.341	2.046	0.104	0.064	0.0021	0.0021	0.0091	0.0091	0.1775	0.1775	0.0111	0.0111
		1.2	0.047	0.397	2.382	0.121	0.075	0.0025	0.0025	0.0104	0.0104	0.1747	0.1747	0.0129	0.0129
		1.5	0.059	0.473	2.838	0.144	0.089	0.0028	0.0028	0.0120	0.0120	0.1705	0.1705	0.0152	0.0152

16 x 16	5/8 x 5/8	1.0	0.039	0.460	2.760	0.140	0.089	0.0054	0.0054	0.0172	0.0172	0.2416	0.2416	0.0206	0.0206
		1.2	0.047	0.540	3.240	0.165	0.104	0.0063	0.0063	0.0199	0.0199	0.2387	0.2387	0.0241	0.0241
		1..5	0.059	0.652	3.912	0.199	0.126	0.0074	0.0074	0.0235	0.0235	0.2343	0.2343	0.0290	0.0290

19 x 19	3/4 x 3/4	1.0	0.039	0.554	3.324	0.169	0.108	0.0094	0.0094	0.0251	0.0251	0.2898	0.2898	0.0297	0.0297
		1.2	0.047	0.653	3.918	0.199	0.127	0.0109	0.0109	0.0291	0.0291	0.2867	0.2867	0.0349	0.0349
		1.5	0.059	0.812	4.872	0.247	0.154	0.0130	0.0130	0.0347	0.0347	0.2823	0.2823	0.0422	0.0422

25 x 25	1×1	1.0	0.039	0.746	4.476	0.227	0.149	0.0228	0.0228	0.0456	0.0456	0.392	0.392	0.0534	0.0534
		1.2	0.047	0.883	5.298	0.269	0.177	0.0267	0.0267	0.0535	0.0535	0.388	0.388	0.0632	0.0632
		1.5	0.059	1.100	6.600	0.335	0.210	0.0313	0.0313	0.0636	0.0636	0.3785	0.3785	0.0759	0.0759
		2.3	0.091	1.580	9.480	0.482	0.303	0.0435	0.0435	0.0885	0.0885	0.3667	0.3667	0.1089	0.1089
		3.0	0.120	2.000	12.000	0.610	0.373	0.0521	0.0521	0.1059	0.1059	0.3569	0.3569	0.1337	0.1337

32 x 32	1 1/4 x 1 1/4	1.2	0.047	1.130	6.780	0.344	0.223	0.0562	0.0562	0.0893	0.0893	0.4954	0.4954	0.1043	0.1043
		1.5	0.059	1.420	8.520	0.433	0.275	0.0683	0.0683	0.1085	0.1085	0.4908	0.4908	0.1278	0.1278
		2.3	0.091	2.100	12.600	0.640	0.402	0.0971	0.0971	0.1541	0.1541	0.4788	0.4788	0.1861	0.1861
		3.0	0.120	2.650	15.900	0.808	0.503	0.1184	0.1184	0.1880	0.1880	0.4686	0.4686	0.2318	0.2318

38 x 38	1 1/2 x 1 1/2	1.2	0.047	1.370	8.220	0.418	0.268	0.0959	0.0959	0.1282	0.1282	0.5918	0.5918	0.1488	0.1488
		1.5	0.059	1.710	10.260	0.521	0.330	0.1170	0.1170	0.1564	0.1564	0.5872	0.5872	0.1830	0.1830
		2.3	0.091	2.540	15.240	0.774	0.488	0.1683	0.1683	0.2250	0.2250	0.5750	0.5750	0.2687	0.2687
		3.0	0.120	3.240	19.440	0.988	0.615	0.2075	0.2075	0.2774	0.2774	0.5646	0.5646	0.3372	0.3372

50 x 50	2×2	1.5	0.059	2.300	13.380	0.701	0.442	0.2744	0.2744	0.2787	0.2787	0.7799	0.7799	0.3231	0.3231
		1.9	0.075	2.840	17.040	0.866	0.552	0.3392	0.3392	0.3446	0.3446	0.7737	0.7737	0.4026	0.4026
		2.3	0.091	3.400	20.400	1.036	0.659	0.4007	0.4007	0.4072	0.4072	0.7676	0.7676	0.4794	0.4794
		3.0	0.120	4.250	25.500	1.295	0.838	0.5009	0.5009	0.5089	0.5089	0.7570	0.7570	0.6074	0.6074
		4.0	0.156	5.450	32.700	1.661	1.077	0.6283	0.6283	0.6384	0.6384	0.7421	0.7421	0.7767	0.7767
		4.5	0.177	6.020	36.120	1.835	1.189	0.6856	0.6856	0.6956	0.6956	0.7349	0.7349	0.8555	0.8555

65 x 65	2 1/2 x 2 1/2	2.3	0.091	4.420	26.520	1.347	0.873	0.9093	0.9093	0.7106	0.7106	1.0084	1.0084	0.8280	0.8280
		3.0	0.120	5.660	33.960	1.725	1.117	1.1479	1.1479	0.8971	0.8971	0.9977	0.9977	1.0564	1.0564
		4.0	0.156	7.340	44.040	2.237	1.449	1.4605	1.4605	1.1414	1.1414	0.9825	0.9825	0.3644	0.3644
		4.5	0.177	8.140	48.840	2.481	1.607	1.6049	1.6049	1.2543	1.2543	0.9751	0.9751	1.5105	1.5105
		5.0	0.197	8.920	53.520	2.719	1.760	1.7418	1.7418	1.3613	1.3613	0.9677	0.9677	1.6515	1.6515
		6.0	0.236	10.400	62.400	3.170	2.051	1.9941	1.9941	1.5585	1.5585	0.9532	0.9532	1.9184	0.9184

75 x 75	3×3	1.9	0.075	4.290	25.740	1.308	0.847	1.1895	1.1895	0.8057	0.8057	1.1753	1.1753	0.9296	0.9296
		2.3	0.091	5.140	30.840	1.567	1.016	1.4169	1.4169	0.9597	0.9597	1.1691	1.1691	1.1131	1.1131
		3.0	0.120	6.600	39.600	2.012	1.303	1.7966	1.7966	1.2169	1.2169	1.1582	1.1582	1.4244	1.4244
		4.0	0.156	8.600	51.600	2.621	1.697	2.3003	2.3003	1.5581	1.5581	1.1430	1.1430	1.8477	1.8477
		4.5	0.177	9.550	57.300	2.911	1.886	2.5358	2.5358	1.7176	1.7176	1.1354	1.1354	2.0501	2.0501
		5.0	0.197	10.500	63.000	3.200	2.070	2.7609	2.7609	1.8700	1.8700	1.1280	1.1280	2.2464	2.2464
		6.0	0.236	12.300	73.800	3.749	2.423	3.1809	3.1809	2.1545	2.1545	1.1132	1.1132	2.6214	2.6214

90 x 90	3 1/2 x 3 1/2	2.3	0.091	6.230	37.380	1.899	1.229	2.4866	2.4866	1.4035	1.4035	1.4101	1.4101	1.6196	1.6196
		3.0	0.120	8.010	48.060	2.441	1.582	3.1679	3.1679	1.7881	1.7881	1.3992	1.3992	2.0793	2.0793
		4.0	0.156	10.500	63.000	3.200	2.069	4.0838	4.0838	2.3051	2.3051	1.3838	1.3838	2.7099	2.7099
		4.5	0.177	11.700	70.200	3.566	2.305	4.5174	4.5174	2.5498	2.5498	1.3761	1.3761	3.0139	3.0139
		5.0	0.197	12.800	76.800	3.901	2.535	4.9352	4.9352	2.7856	2.7856	1.3685	1.3685	3.3105	3.3105
		6.0	0.236	15.100	90.600	4.602	2.981	5.7250	5.7250	3.2314	3.2314	1.3536	1.3536	3.8818	3.8818

100 x 100	4×4	2.3	0.091	6.950	41.700	2.118	1.372	3.4374	3.4374	1.7462	1.7462	1.5707	1.5707	2.2100	2.2100
		3.0	0.120	8.960	53.760	2.731	1.768	4.3896	4.3896	2.2299	2.2299	1.5598	1.5598	2.5846	2.5846
		4.0	0.156	11.700	70.200	3.566	2.317	5.6781	5.6781	2.8845	2.8845	1.5443	1.5443	3.3763	3.3763
		4.5	0.177	13.100	78.600	3.993	2.584	6.2916	6.2916	3.1961	3.1961	1.5367	1.5367	3.7595	3.7595
		5.0	0.197	14.400	86.400	4.389	2.845	6.8852	6.8852	3.4977	3.4977	1.5290	1.5290	4.1344	4.1344
		6.0	0.236	17.000	102.000	5.181	3.353	8.0145	8.0145	4.0713	4.0713	1.5139	1.5139	4.8594	4.8594

125 x 125	5×5	3.0	0.120	11.300	67.800	3.444	2.233	8.7305	8.7305	3.5481	3.5481	1.9615	1.9615	4.0881	4.0881
		4.0	0.156	14.900	89.400	4.541	2.937	11.3622	11.3622	4.6176	4.6176	1.9459	1.9459	5.3626	5.3626
		4.5	0.177	16.600	99.600	5.059	3.281	12.6285	12.6285	5.1322	5.1322	1.9381	1.9381	5.9838	5.9838
		5.0	0.197	18.300	109.800	5.578	3.620	13.8625	13.8625	5.6337	5.6337	1.9304	1.9304	6.5944	6.5944
		6.0	0.236	38.200	130.200	6.614	4.283	16.2356	16.2356	6.5982	6.5982	1.9151	1.9151	7.7840	7.7840

150 x 150	6×6	4.0	0.156	18.000	108.000	5.486	3.557	19.9535	19.9535	6.7576	6.7576	2.3475	2.3475	7.8066	7.8066
		4.5	0.177	20.200	121.200	6.157	3.979	22.2224	22.2224	7.5260	7.5260	2.3397	2.3397	8.7230	8.7230
		5.0	0.197	22.300	133.800	6.797	4.395	24.4435	24.4435	8.2782	8.2782	2.3319	2.3319	9.6265	9.6265
		6.0	0.236	26.400	158.400	8.046	5.213	28.7452	28.7452	9.7351	9.7351	2.3165	2.3165	11.3951	11.3951
		9.0	0.354	38.200	229.200	11.643	7.545	40.5732	40.5732	13.7408	13.7408	2.2709	2.2709	16.4006	16.4006

175 x 175	7×7	4.5	0.177	23.700	142.200	7.223	4.676	35.7488	35.7488	10.3774	10.3774	2.7414	2.7414	11.9771	11.9771
		6.0	0.236	31.100	186.600	9.479	6.143	46.4443	46.4443	13.4821	13.4821	2.7180	2.7180	15.6927	15.6927
		9.0	0.354	45.300	271.800	13.808	8.940	66.1326	66.1326	19.1973	19.1973	2.6720	2.6720	22.7234	22.7234
		12.0	0.472	58.500	351.000	17.830	11.553	83.6884	83.6884	24.2936	24.2936	2.6270	2.6270	29.2368	29.2368

200 x 200	8×8	4.5	0.177	27.200	163.200	8.290	5.374	53.8836	53.8836	13.6864	13.6864	3.1431	3.1431	15.7461	15.7461
		6.0	0.236	35.800	214.800	10.911	7.073	70.2337	70.2337	17.8394	17.8394	3.1196	3.1196	20.6768	20.6768
		9.0	0.354	52.300	314.800	15.940	10.335	100.6653	100.6653	25.5690	25.5690	3.0733	3.0733	30.0760	30.0760
		12.0	0.472	67.900	407.400	20.695	13.413	128.2314	128.2314	32.5708	32.5708	3.0278	3.0278	38.8755	38.8755

250 x 250	10×10	6.0	0.236	45.200	271.200	13.776	8.933	139.6874	139.6874	28.3845	28.3845	3.9229	3.9229	32.7046	32.7046
		9.0	0.354	66.500	399.000	20.268	13.125	202.0565	202.0565	41.0579	41.0579	3.8762	3.8762	47.8706	47.8706
		12.0	0.472	86.800	520.800	26.455	17.133	259.7698	259.7698	52.7852	52.7852	3.8302	3.8302	62.2720	62.2720

FAQ Section

QUESTION 1: What hollow section is recommended for high-wind coastal projects in Terengganu?

ANSWER 1: For coastal environments like Terengganu, Galvanized Iron (GI) Hollow Sections are the primary recommendation. The specialized zinc-coated barrier is engineered to withstand high humidity and saline (salt-laden) air, preventing the rapid oxidation and structural failure common in non-galvanized steel.

QUESTION 2: Can Besi Hollow GI be used for structural roof purlins?

ANSWER 2: Yes. Besi Hollow GI is a high-tensile structural alternative to traditional timber or mild steel purlins (Rangka Bumbung). Its high strength-to-weight ratio and inherent rust resistance make it ideal for long-span roofing systems in Malaysia’s tropical climate.

QUESTION 3: Does Kee Maju Jaya provide custom cutting for GI pipes and sections?

ANSWER 3: While our standard stock length is 6 meters (20 feet), Kee Maju Jaya provides precision custom cutting services tailored to specific project blueprints. This logistical support reduces on-site wastage and optimizes installation timelines for contractors.

QUESTION 4: Why should I choose GI Hollow over Mild Steel for outdoor fencing?

ANSWER 4: GI Hollow sections (Besi Kotak GI) feature a “Tahan Karat” (rust-resistant) finish that Mild Steel lacks. For outdoor fencing exposed to heavy monsoon rainfall, GI ensures superior aesthetic longevity and structural integrity without the need for frequent, costly repainting.

SOALAN 1: Apakah jenis besi hollow yang disyorkan untuk projek kawasan pantai di Terengganu?

JAWAPAN 1: Untuk kawasan pesisir pantai seperti Terengganu, Besi Hollow GI (Galvanized Iron) adalah pilihan utama. Lapisan zink khasnya direka untuk menahan kelembapan tinggi dan udara masin, sekaligus menghalang karat pantas yang biasanya berlaku pada besi hitam biasa.

SOALAN 2: Bolehkah Besi Hollow GI digunakan sebagai “purlin” rangka bumbung?

JAWAPAN 2: Ya. Besi Hollow GI sering digunakan sebagai purlin struktur (Rangka Bumbung) kerana kekuatan tensilnya yang tinggi dan sifat tahan karat. Ia merupakan alternatif yang lebih tahan lama berbanding kayu tradisional atau besi hitam (mild steel).

SOALAN 3: Adakah Kee Maju Jaya menyediakan perkhidmatan potong mengikut saiz untuk paip GI?

JAWAPAN 3: Walaupun saiz standard kami adalah 6 meter (20 kaki), Kee Maju Jaya menyediakan perkhidmatan pemotongan custom mengikut keperluan spesifik projek. Ini membantu kontraktor mengurangkan pembaziran bahan di tapak bina.

SOALAN 4: Mengapa perlu memilih GI Hollow berbanding Mild Steel untuk pagar luar?

JAWAPAN 4: Besi Hollow GI (Besi Kotak GI) mempunyai kemasan “Tahan Karat” yang tidak ada pada Mild Steel. Untuk pagar yang terdedah kepada hujan lebat di Malaysia, penggunaan GI menjamin ketahanan struktur dan rupa paras yang kemas tanpa perlu kerap mengecat semula.

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Galvanized Iron (GI) Hollow Section — Structural Rust Resistance | Besi Hollow GI

Galvanized Iron (GI) Hollow Section — Structural Rust Resistance | Besi Hollow GI

ASTM 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

12 x 12

1/2 x 1/2

1.0

0.039

0.341

2.046

0.104

0.064

0.0021

0.0021

0.0091

0.0091

0.1775

0.1775

0.0111

0.0111

1.2

0.047

0.397

2.382

0.121

0.075

0.0025

0.0025

0.0104

0.0104

0.1747

0.1747

0.0129

0.0129

1.5

0.059

0.473

2.838

0.144

0.089

0.0028

0.0028

0.0120

0.0120

0.1705

0.1705

0.0152

0.0152

12
x
12

1/2
x
1/2

16
x
16

5/8
x
5/8

19
x
19

3/4
x
3/4