You are here: Home » Blog » Industry Solutions » Strapping Size Chart And Guide: Steel, PET And PP Widths, Thicknesses And Matching Seal Sizes

Strapping Size Chart And Guide: Steel, PET And PP Widths, Thicknesses And Matching Seal Sizes

Views: 0 Author: Sunny Publish Time: 2026-10-14 Origin: Site

We make steel, PET and PP strapping, and the seals that join them, at our factory in Changzhou, China. This strapping size chart lists the sizes we produce for the three main types of strapping, with break strengths in pounds and newtons and the seals that fit each width.

It covers strapping for industrial packaging only, not wood furring strips or perforated building straps.

Steel strapping, PET strapping, strapping seals and tools from JUHONG displayed together

Strapping Size Charts by Strapping Material

Inches and millimeters are simply different units of measurement. Different people use different units—some use millimeters while others use inches. It is purely a matter of unit conversion.

Steel Strapping Widths, Thicknesses and Break Strength

We sell steel strapping in five tensile classes: Terra (650 N/mm²), Ridge (750 N/mm²), Pivot (830 N/mm²), Duro (930 N/mm²) and Nexa (980 N/mm²). UltiMax is our high tensile, high elongation line, made to ASTM and EN requirements. Strengths below are average values. The full range is on our steel strapping page. We also make stainless steel strapping, sold as stainless steel banding with its own buckles and tools.

Coil winding: M = mini coil, R = ribbon wound, O = oscillated wound, J = jumbo coil.

Black painted steel strapping coils stacked on pallets in the JUHONG warehouse

Regular to High Tensile Steel Strapping: Terra, Ridge, Pivot, Duro and Nexa

Terra, Ridge, Pivot and Duro are what most customers use for palletizing, unitizing and crate work. We recommend Nexa (980 N/mm²), our high tensile series, to secure steel coils, pipe bundles, heavy machinery and loads going by rail transportation. Nexa covers 1/2 in through 2 in and is our only series in 2 in width. Each row is one size, with its average break strength in every series we make it in. A slash means that size is not made in that series. Product details are on our regular duty steel strapping page.

Width, in	Width, mm	Thickness, in	Thickness, mm	Terra 650 N/mm², lbs	Terra 650 N/mm², N	Ridge 750 N/mm², lbs	Ridge 750 N/mm², N	Pivot 830 N/mm², lbs	Pivot 830 N/mm², N	Duro 930 N/mm², lbs	Duro 930 N/mm², N	Nexa 980 N/mm², lbs	Nexa 980 N/mm², N	Length/weight, ft/lb	Length/weight, m/kg	Coil winding
1/2	12.7	0.015	0.38	706	3,137	/	/	/	/	/	/	/	/	39.2	26.5	M/R
1/2	12.7	0.020	0.51	947	4,210	1,093	4,858	1,209	5,376	1,355	6,024	1,428	6,347	29.4	19.8	M/R/O/J
1/2	12.7	0.023	0.58	1,077	4,788	1,243	5,525	1,375	6,114	1,541	6,850	1,624	7,219	25.6	17.2	M/R/O/J
5/8	16	0.015	0.38	889	3,952	/	/	/	/	/	/	/	/	29.6	20.0	M/R
5/8	16	0.020	0.51	1,193	5,304	1,377	6,120	1,524	6,773	1,707	7,589	1,799	7,997	23.6	15.9	M/R/O/J
5/8	16	0.023	0.58	1,357	6,032	1,566	6,960	1,733	7,702	1,941	8,630	2,046	9,094	20.5	13.8	M/R/O/J
3/4	19	0.020	0.51	1,417	6,299	1,635	7,268	1,809	8,043	2,027	9,012	2,136	9,496	19.6	13.2	M/R/O/J
3/4	19	0.023	0.58	1,611	7,163	1,859	8,265	2,058	9,147	2,306	10,249	2,429	10,800	17.1	11.5	M/R/O/J
3/4	19	0.028	0.71	1,973	8,769	2,276	10,118	2,519	11,197	2,822	12,546	2,974	13,220	14.2	9.6	M/R/O/J
3/4	19	0.031	0.79	2,195	9,757	2,532	11,258	2,803	12,458	3,140	13,959	3,309	14,710	12.5	8.4	M/R/O/J
3/4	19	0.035	0.89	2,473	10,992	2,853	12,683	3,157	14,035	3,538	15,726	3,728	16,572	11.1	7.5	M/R/O/J
1	25	0.031	0.79	2,888	12,838	3,332	14,813	3,688	16,393	4,132	18,368	4,354	19,355	9.5	6.4	M/R/J
1	25	0.035	0.89	3,253	14,463	3,754	16,688	4,154	18,468	4,655	20,693	4,905	21,805	8.5	5.7	M/R/J
1-1/4	31.75 (32)	0.028	0.71	3,296	14,653	3,803	16,907	4,209	18,710	4,716	20,965	4,970	22,092	8.5	5.7	M/R/J
1-1/4	31.75 (32)	0.031	0.79	3,668	16,304	4,232	18,812	4,683	20,818	5,248	23,327	5,530	24,581	7.4	5.0	M/R/J
1-1/4	31.75 (32)	0.035	0.89	4,132	18,367	4,768	21,193	5,276	23,454	5,912	26,279	6,230	27,692	6.7	4.5	M/R/J
1-1/4	31.75 (32)	0.040	1.00	/	/	5,357	23,813	5,928	26,353	6,642	29,528	7,000	31,115	5.9	4.0	R/J
1-1/4	31.75 (32)	0.044	1.10	/	/	5,893	26,194	6,521	28,988	7,307	32,480	7,700	34,227	5.3	3.6	R/J
2	50	0.047	1.20	/	/	/	/	/	/	/	/	8,400	37,338	3.1	2.1	R/J

UltiMax High Tensile, High Elongation Steel Strapping

UltiMax comes in 3/4 in and 1-1/4 in, in a 1,000 N/mm² grade with at least 10% elongation and a 900 N/mm² grade with 6.5–12% minimum elongation. The extra elongation lets the strap absorb shock in transit. See high tensile steel strapping.

Width, in	Width, mm	Thickness, in	Thickness, mm	Strength, lbs	Strength, N	Strength, N/mm²	Elongation	Length/weight, ft/lb	Length/weight, m/kg	Coil winding	Standard
3/4	19	0.031	0.79	3,377	15,010	1,000	≥ 10%	12.5	8.4	R/O/J	ASTM & EN
1-1/4	31.75	0.031	0.79	5,643	25,083	1,000	≥ 10%	7.4	5.0	R/O/J	ASTM & EN
3/4	19	0.031	0.79	3,039	13,509	900	6.5–12% min	12.5	8.4	R/O/J	ASTM & EN
1-1/4	31.75	0.031	0.79	5,078	22,574	900	6.5–12% min	7.4	5.0	R/O/J	ASTM & EN

UltiMax elongation is measured to the US and European methods that our export buyers specify. The three standards use different gauge lengths, and a shorter gauge length gives a higher percentage for the same strap. An elongation figure only means something next to its gauge length.

Standard	Gauge length for elongation
ASTM D3953-15 (US)	6 in (150 mm)
EN 13246 (Europe)	100 mm
GB/T 25820-2025 (China)	30 mm

SGS tested two of our high elongation samples to EN 13246 in May 2025. A 19 × 0.79 mm sample reached 1,082 MPa with 14.5% elongation over 100 mm, and a 31.75 × 0.80 mm sample reached 1,040 MPa with 19.5%.

Two sizes, 3/4 × 0.031 in and 1-1/4 × 0.031 in high tensile strap with notch-type joints, are verified under the AAR Open Top Loading Rules (AAR ID 124, LR 1.17.069). The verification covers those two sizes only. See AAR steel strapping and how our high tensile strap compares with ASTM requirements.

Polyester (PET) Strapping Widths, Thicknesses and Break Strength

We make PET strapping (polyester strapping) from 9 mm to 32 mm wide. Each width covers a range of thicknesses and grades, so the strength is given as a range. The last column shows the sizes customers order from us most. Inch thicknesses are rounded trade equivalents.

Width, in	Width, mm	Thickness range, in (min–max)	Thickness range, mm (min–max)	Break range, kg (min–max)	Break range, N (min–max)	Best-selling dimensions, mm
3/8	9	0.021–0.024	0.5–0.8	157–360	1,540–3,550	9 × 0.6
1/2	10	0.021–0.024	0.5–0.8	175–400	1,715–3,920	10 × 0.5
1/2	11	0.021–0.040	0.5–0.8	192–440	1,880–4,300	11 × 0.6
1/2	12	0.021–0.040	0.5–1.0	210–600	2,050–5,880	12 × 0.6/0.7
1/2	13	0.021–0.040	0.5–1.0	227–650	2,230–6,370	13 × 0.6
5/8	15	0.021–0.040	0.5–1.0	210–750	2,000–7,350	15 × 0.8
5/8	16	0.021–0.050	0.5–1.2	225–960	2,200–9,400	16 × 0.8/0.9/1.0
3/4	19	0.031–0.055	0.8–1.4	420–1,330	4,170–13,030	19 × 0.8/1.0/1.2
1	25	0.031–0.055	0.8–1.4	700–1,750	6,860–17,150	25 × 1.0/1.2
1-1/4	32/31.75	0.031–0.055	0.8–1.4	880–2,240	8,710–21,950	32 × 1.0/1.2

Green, black, white and red PET strapping coils

In June 2025, SGS tested our 16 × 0.8 mm PET strap (measured 0.86 mm thick) at 368 MPa tensile stress at break and 8.9% elongation over a 100 mm gauge length. In March 2026, our 19 × 1.0 mm embossed strap broke at 7,490 N in a third-party test, above the 7,410 N required, with 10% elongation.

Three PET sizes are verified under the AAR Open Top Loading Rules: 5/8 × 0.035 in, 5/8 × 0.040 in and 3/4 × 0.040 in, smooth and embossed, with friction welds (LR 1.19.375, valid to November 2028). See AAR PET strapping.

Hand grade and machine grade come in the same widths. Hand grade is for strap applied by hand with manual or battery tools. Machine grade has to run through a strap track without wandering, so straightness and even thickness matter more. Consistent strap keeps an automatic line efficient. We make both: hand grade PET strapping and machine grade polyester strapping.

PP Strapping Widths, Thicknesses and Tensile Strength

Our polypropylene strapping (PP strapping) is for cartons and lightweight bundles. Each row is one model, and you can order by model code or by width and thickness. Tensile strength is for a single strap. The strength of a sealed joint depends on the strapping machine that makes it, so we don't list it.

Model	Width, mm	Thickness, mm	Meter weight, g/m	Net weight, kg	Gross weight, kg	Length, m	Tensile strength, kg	Elongation	Bend (camber)	Paper tube diameter, mm	Paper tube height, mm
05045-6000-13.5	4.5–5.1	0.40–0.50	1.35	8.1	8.6	6,000	50	< 20%	< 60 mm/1 m	200	188
05047-7000-14	4.5–5.1	0.42–0.52	1.4	9.8	10.3	7,000	56	< 20%	< 60 mm/1 m	200	188
05055-6000-15	4.5–5.1	0.50–0.60	1.5	9	9.5	6,000	60	< 20%	< 60 mm/1 m	200	188
0506-16	4.5–5.1	0.55–0.65	1.6	9	9.5	5,620	61	< 20%	< 60 mm/1 m	200	188
08035-4000-15	7.5–8.1	0.30–0.40	1.5	6	6.5	4,000	60	< 20%	< 50 mm/1 m	200	188
08045-4000-18	7.5–8.1	0.40–0.50	1.8	7.2	7.7	4,000	75	< 20%	< 50 mm/1 m	200	188
08045-4000-20	7.5–8.1	0.40–0.50	2	8	8.5	4,000	80	< 20%	< 50 mm/1 m	200	188
0805-4000-22	7.5–8.1	0.45–0.55	2.2	8.8	9.3	4,000	85	< 20%	< 50 mm/1 m	200	188
09055-3800-25	8.5–9.3	0.50–0.60	2.5	9.5	10	3,800	100	< 20%	< 40 mm/1 m	200	188
0907-27	8.5–9.3	0.65–0.75	2.7	9.5	10	3,500	102	< 20%	< 40 mm/1 m	200	188
11035-3000-20	10.5–11.3	0.30–0.40	2	6	6.5	3,000	75	< 20%	< 40 mm/1 m	200	188
11045up-3000-22	10.5–11.3	0.40–0.50	2.2	6.6	7.1	3,000	80	< 20%	< 40 mm/1 m	200	188
11045-3000-25	10.5–11.3	0.40–0.50	2.5	7.5	8	3,000	90	< 20%	< 40 mm/1 m	200	188
1105-3000-30	10.5–11.3	0.45–0.55	3	9	9.5	3,000	108	< 20%	< 40 mm/1 m	200	188
1206up-3000-27	11.2–12.0	0.50–0.60	2.7	8.1	8.6	3,000	105	< 20%	< 40 mm/1 m	200	188
1206-3000-31	11.5–12.3	0.55–0.65	3.1	9.3	9.8	3,000	122	< 20%	< 30 mm/1 m	200	188
12063-3000-33	11.5–12.3	0.58–0.68	3.3	9.9	10.4	3,000	132	< 20%	< 30 mm/1 m	200	188
12068-2500-40	11.5–12.3	0.63–0.73	4	10	10.5	2,500	150	< 20%	< 30 mm/1 m	200	188
1208-2000-50	11.5–12.3	0.75–0.85	5	10	10.5	2,000	180	< 20%	< 30 mm/1 m	200	188
13065-2500-40	12.5–13.3	0.60–0.70	4	10	10.5	2,500	150	< 20%	< 40 mm/2 m	200	188
1307-2000-50	12.5–13.3	0.65–0.75	5	10	10.5	2,000	180	< 20%	< 30 mm/1 m	200	188
1309-65	12.5–13.3	0.85–0.95	6.5	9.5	10	1,460	220	< 20%	< 30 mm/1 m	200	188
1506-2500-40	14.5–15.3	0.55–0.65	4	10	10.5	2,500	150	< 20%	< 30 mm/1 m	200	188
1508-75	14.5–15.3	0.75–0.85	7.5	10	10.5	1,330	240	< 20%	< 30 mm/1 m	200	188
1908-1500-85	18.5–19.3	0.75–0.85	8.5	12.75	13.25	1,500	260	< 20%	< 30 mm/1 m	200	188

All models are wound on a paper tube 200 mm in diameter and 188 mm high, with net roll weights of 6 to 12.75 kg. Meter weight is held to ±0.1 g, roll weight to +0.2/−0.15 kg and roll length to ±1%. Width, thickness, elongation and bend (camber) are checked to Chinese national standards.

How to Read Strapping Dimensions

"3/4 in × 0.031 in, 980 N/mm², oscillated" and "19 × 0.8 mm" can describe the same steel strap.

Width in Inches and Millimeters: Exact Conversions vs. Nominal Sizes

Strap widths are trade sizes, so the millimeter figure is usually rounded.

Nominal width, in	Exact conversion, mm	Usually written as, mm
3/8	9.53	9.5
1/2	12.70	12.7 or 13
5/8	15.88	16
3/4	19.05	19
1	25.40	25
1-1/4	31.75	32 or 31.75
2	50.80	50

That rounding is why a 32 mm seal fits 1-1/4 in strap, and why we list 10, 11, 12 and 13 mm PET under 1/2 in. China's seal standard, GB/T 39040-2020, pairs 32 mm seals with 31.75 mm strap and 25 mm seals with 25.4 mm strap in the same way. Put the trade size on the purchase order and use the millimeter figure as a cross-check.

Measuring the width of green embossed PET strapping with a vernier caliper

Measuring the thickness of PET strapping with a micrometer

Thickness in Inches, and Millimeters

0.020 in, and 0.51 mm are the same thickness.

Inch	Mil	Millimeter
0.015	15	0.38
0.020	20	0.51
0.023	23	0.58
0.028	28	0.71
0.031	31	0.79
0.035	35	0.89
0.040	40	1.00
0.047	47	1.20

How Much Weight Can Strapping Hold?

A strap's break strength is the force that snaps it in a tensile test. The load, the number of straps, handling and the joint determine how much weight it can secure.

Many packaging suppliers use this rule of thumb to determine how much strapping strength a pallet needs.

Required break strength per strap = pallet weight × 1.5 ÷ number of straps

A 1,200 lb pallet with two straps needs about 900 lbs per strap. Our 1/2 × 0.020 in steel strap starts at 947 lbs, and 12 mm PET from the upper half of its 210–600 kg range also clears it. Tall or rigid loads need more margin, and so do long sea or rail shipping routes and loads lifted by the straps, often with more straps. Use protective edge boards where strap crosses a sharp corner. Oversized strap only adds cost and waste. Run a trial shipment for each application before you standardize a size.

The joint is the weak point. In ASTM D3953-15, extra-heavy-duty 1-1/4 × 0.044 in steel strap has a minimum break strength of 8,500 lbf but a minimum seal-joint strength of 7,650 lbf. With PP, joint strength depends on the machine that makes the weld.

For plastic strap on specific loads, see how to choose PET strapping.

Matching Seal Sizes to Your Strapping

Select the seal width first: it matches the strap width. Then the style, which depends on your tool and the shape of the load. Then the length and thickness: wider, thicker, higher-tensile strap needs a longer, thicker seal. We make our seals in the same factory as our strap, so one order can cover both. See all our strapping seals.

Snap-on, push type, thread-on, open-flange, magazine and serrated strapping seals

Steel Strapping and Compatible Steel Seals

Seal sizes are written length × thickness, in inches (1.77 × .031 means 1.77 in long and 0.031 in thick) and in millimeters. The table also covers our serrated seals for PET strapping and our magazine seals for machines, described below.

Seal type	Strap width, in	Seal L × T, in	Strap width, mm	Seal L × T, mm
Push type (closed)	1/2	0.86 × .023	12.7	22 × 0.6
Push type (closed)	5/8	0.86 × .023	16	22 × 0.6
Push type (closed)	5/8	0.98 × .023	16	25 × 0.6
Push type (closed)	3/4	0.86 × .023	19	22 × 0.6
Push type (closed)	3/4	0.98 × .023	19	25 × 0.6
Push type (closed)	3/4	1.26 × .023	19	32 × 0.6
Push type (closed)	3/4	1.57 × .023	19	40 × 0.6
Push type (closed)	3/4	1.57 × .028	19	40 × 0.7
Push type (closed)	3/4	1.77 × .028	19	45 × 0.7
Push type (closed)	3/4	1.77 × .031	19	45 × 0.8
Push type (closed)	3/4	1.77 × .035	19	45 × 0.9
Push type (closed)	3/4	1.89 × .031	19	48 × 0.8
Push type (closed)	3/4	1.89 × .035	19	48 × 0.9
Push type (closed)	3/4	2 × .035	19	50 × 0.9
Push type (closed)	3/4	2.16 × .035	19	55 × 0.9
Push type (closed)	3/4	2.24 × .035	19	57 × 0.9
Push type (closed)	1	1.89 × .031	25	48 × 0.8
Push type (closed)	1	1.89 × .035	25	48 × 0.9
Push type (closed)	1	2 × .035	25	50 × 0.9
Push type (closed)	1-1/4	1.5 × .035	32/31.75	38 × 0.9
Push type (closed)	1-1/4	1.57 × .028	32/31.75	40 × 0.7
Push type (closed)	1-1/4	1.77 × .028	32/31.75	45 × 0.7
Push type (closed)	1-1/4	1.77 × .031	32/31.75	45 × 0.8
Push type (closed)	1-1/4	1.77 × .035	32/31.75	45 × 0.9
Push type (closed)	1-1/4	1.89 × .028	32/31.75	48 × 0.7
Push type (closed)	1-1/4	1.89 × .031	32/31.75	48 × 0.8
Push type (closed)	1-1/4	1.89 × .035	32/31.75	48 × 0.9
Push type (closed)	1-1/4	2 × .035	32/31.75	50 × 0.9
Push type (closed)	1-1/4	2.16 × .028	32/31.75	55 × 0.7
Push type (closed)	1-1/4	2.08 × .035	32/31.75	53 × 0.9
Push type (closed)	1-1/4	2.16 × .035	32/31.75	55 × 0.9
Push type (closed)	1-1/4	2.24 × .035	32/31.75	57 × 0.9
Push type (closed)	1-1/4	2.95 × .035	32/31.75	75 × 0.9
Serrated	3/4	1.02 × .028	19	26 × 0.7
Serrated	3/4	1.10 × .023	19	28 × 0.6
Serrated	5/8	1.02 × .028	16	26 × 0.7
Serrated	5/8	1.10 × .023	16	28 × 0.6
Serrated	1/2	1.02 × .028	12.7	26 × 0.7
Serrated	1/2	1.10 × .023	12.7	28 × 0.6
Open-flange (semi-closed)	1	2.16 × .035	25	55 × 0.9
Open-flange (semi-closed)	1-1/4	2.16 × .035	32/31.75	55 × 0.9
Thread-on (semi-open)	3/4	2.16 × .035	19	55 × 0.9
Thread-on (semi-open)	1-1/4	1.57 × .028	32/31.75	40 × 0.7
Thread-on (semi-open)	1-1/4	1.77 × .031	32/31.75	45 × 0.8
Thread-on (semi-open)	1-1/4	1.77 × .028	32/31.75	45 × 0.7
Thread-on (semi-open)	1-1/4	1.89 × .035	32/31.75	48 × 0.9
Thread-on (semi-open)	1-1/4	2 × .035	32/31.75	50 × 0.9
Snap-on (open)	1/2	1.26 × .023	12.7	32 × 0.6
Snap-on (open)	5/8	1.26 × .023	16	32 × 0.6
Snap-on (open)	3/4	1.26 × .023	19	32 × 0.6
Magazine	3/4	1.10 × .023	19	28 × 0.6
Magazine	1-1/4	1.5 × .031	32/31.75	38 × 0.8
Magazine	1-1/4	1.5 × .040	32/31.75	38 × 1.0
Magazine	1-1/4	1.57 × .040	32/31.75	40 × 1.0
Magazine	1-1/4	2 × .040	32/31.75	50 × 1.0
Magazine	1-1/4	2 × .043	32/31.75	51 × 1.1
Magazine	2	2.95 × .040	50	75 × 1.0
Magazine	2	2.95 × .05	50	75 × 1.2
Cross-shaped	1-1/4	5.8 × .035	32/31.75	148 × 0.9
Right-angle	1-1/4	0.035 thick	32/31.75	0.7 thick

Snap-On Seals

snap on seal(1)

Snap-on seals are open on one side and go over the strap ends during or after tensioning. Most pallet, crate and package strapping done with a separate tensioner and sealer uses them.

Push Type Seals

Push Type Seal(2)

Push type seals, also called closed or overlap seals, go onto the strap before tensioning, and the tensioner pushes against the seal. They hold well on coils, pipe and other round or irregular loads. We make more lengths of this style than any other, up to 75 mm for 1-1/4 in strap.

Thread-On Seals

Thread-on Seal

Thread-on seals are semi-open and are fed onto the strap before the tool goes on. We make them mostly for 1-1/4 in strap on heavy bundles, plus a 55 mm size for 3/4 in strap.

Open-Flange Seals

Open-flange seal

Open-flange seals are semi-closed. Their flanges fold around the strap during crimping. We make one size, 55 × 0.9 mm, for 1 in and 1-1/4 in strap.

PET Strapping and Compatible Serrated Seals

serrated seals(1)(1)(2)

PET is smoother and softer than steel, so a plain steel seal can slip. Serrated seals have teeth inside that bite into the strap. Ours fit 1/2, 5/8 and 3/4 in strap (12.7, 16 and 19 mm) in two sizes, 26 × 0.7 mm and 28 × 0.6 mm, for use with a manual tensioner and sealer. A friction-weld or heat-weld tool needs no seal, because it melts the two strap layers together.

Green embossed PET strapping joined with a serrated steel seal

PP Strapping: Seals, Buckles and Machine Sealing

Most PP is heat-sealed on a strapping machine as part of the packing process, with no seal. By hand, PP is closed with metal seals or buckles. Our serrated seals are made for plastic strap; pick the width closest to your PP and try a sample in your own sealer first. The steps are in how to use plastic strapping with metal clips.

Seal Width, Length and Thickness: What Each Dimension Means

Dimension	What it means	How it is chosen
Width	The strap width the seal fits	Same as the strap width. The inside is a little wider so both strap ends pass through: GB/T 39040-2020 gives 22.5 mm inside for a 19 mm seal and 35.5 mm for a 31.75 mm seal.
Length	How much of the strap overlap the seal grips	Longer for wider, thicker, higher-tensile strap. Our 3/4 in seals run from 22 mm to 57 mm.
Thickness	Steel thickness of the seal itself, not of the strap	Goes up with strap strength: 0.6 mm on our light 12.7–19 mm seals, up to 1.1 mm on 1-1/4 in magazine seals and 1.2 mm on 2 in.

GB/T 39040-2020, China's national standard for steel seals and edge protectors, writes a seal as style code + thickness × width × length. "P0.8×19×45" is a push type seal, 0.8 mm thick, for 19 mm strap, 45 mm long. We helped draft it: under our former company name, Jiangsu Juhong Strapping Manufacturing Co., Ltd., we are listed among its drafting organizations, together with steel producers, other strapping manufacturers and a metallurgical standards institute. For choosing a seal type, see how to choose the right strapping seal.

Diagram of strapping seal marked with length, width and thickness

Magazine Seals for Automatic Strapping Machines

Magazine seal

Magazine seals are stacked in strips and loaded into the seal magazine of a combination tool or an automatic steel strapping machine, so no one hand-feeds each seal and line efficiency goes up. Ours are 28 × 0.6 mm for 3/4 in strap; 38 × 0.8, 38 × 1.0, 40 × 1.0, 50 × 1.0 and 51 × 1.1 mm for 1-1/4 in; and 75 × 1.0 and 75 × 1.2 mm for 2 in. The seal has to feed through the machine, so tell us the machine brand and model along with the strap width when you order magazine seals.

When Does Strapping Need No Separate Seal?

Close-up of a friction-welded joint on green PET strapping Heat-Sealed Hot Knife

Steel with a sealless tool. The tool cuts interlocking notches into the two strap ends and locks them together. No seals to stock. Check that the tool is rated for your strap width, thickness and class. See our manual sealless steel strapping tools.
PET with a friction-weld or heat-weld tool. Battery and pneumatic tools melt the two layers together. Our AAR-verified PET sizes (5/8 × 0.035, 5/8 × 0.040 and 3/4 × 0.040 in) were verified with friction welds.
PP on a machine. Semi-automatic and automatic machines heat-seal the joint.

Manual tensioner-and-sealer sets and seal-feed steel tools still need seals. Our strapping tools are listed by joint type.

Will the Strap and Seal Fit Your Existing Equipment?

When a buyer changes strap size or supplier, the tools and machines already on the floor usually decide what will work. Check three things.

Strap Width and Thickness Limits

Every tensioner, sealer and strapping head is designed for a set range of widths and thicknesses. Outside it, the tool may slip, under-tension or jam. The range is in the manual or on the nameplate. Ask us for samples and run them in your own tools before switching a line. Tool types are covered in our steel strapping tools guide.

Seal Profile, Sealer Jaws and Joint Type

A sealer is built for one seal width and profile. The right width in the wrong style or length may not sit in the jaws, and a seal that is not properly crimped is a common reason straps fail under tension. Send us your sealer model with the seal order. If your strap breaks at the joint, read why steel strapping breaks during tensioning.

Coil Core and Winding Compatibility

Plastic strap has to fit your dispenser or machine spindle. Steel coils have to fit your dispenser's winding type.

Strap	Core or winding we supply	Note
Hand grade PET	406 × 150 mm (16 × 6 in) paper core, or coreless; 200 mm (8 in) core as an option	About 20 kg per coil is usual for manual work
Machine grade PET	406 mm inside diameter; core width 76 to 1,000 mm depending on coil weight (10 kg to 1,000 kg jumbo)	Match core width and coil weight to the uncoiler
PP	200 mm inside diameter × 188 mm paper core	Check the spindle size
Steel	Mini, ribbon, oscillated or jumbo coils	Oscillated coils hold more strap and need an oscillated-coil dispenser

US suppliers often list plastic strap cores as 16 × 6, 16 × 3, 8 × 8 or 9 × 8 in (inside diameter × core width). Compare your current core before ordering. More detail is in steel strapping winding methods, PET strapping roll specifications and strapping dispensers.

Ribbon wound, oscillated and jumbo steel strapping coil sizes with inner and outer diameters

Common Strapping Size Mistakes to Avoid

Assuming the Same Width Makes Steel, PET and PP Interchangeable

Steel, PET and PP strap in 1/2 in share a width and little else. Our 1/2 × 0.020 in steel strap averages 947 to 1,428 lbs depending on class, while our 12 mm PP tops out at 180 kg (397 lbs). They also need different seals and tools. Check strength, joint method and tools before switching strapping material. The material choice itself is covered in PET vs PP strapping.

Comparing Smooth and Embossed Strap by Thickness Alone

Embossing presses a pattern into PET or PP. It helps the strap resist splitting, but an embossed strap also measures thicker than a smooth strap with the same amount of material. Two straps listed at the same thickness can break at different loads. Compare plastic strap by width and break strength, and treat thickness as a second check. See smooth vs embossed PET strapping.

Smooth and Embossed plastic strapping

What to Specify When Ordering Strapping and Seals

With these details in your first message, we can quote strap and seals without going back and forth.

Item	What to state	Example
Material and grade	Steel series or tensile class, or PET / PP	Steel, Nexa 980 N/mm²
Width and thickness	Trade size, in inches or mm	3/4 in × 0.031 in (19 × 0.8 mm)
Finish	Steel: painted and waxed, blued and waxed, or zinc coated (galvanized steel), which is more corrosion resistant and adds durability in outdoor storage. Plastic: smooth or embossed, color	Black painted and waxed
Seals	Style, strap width, seal length × thickness, quantity	Push type, 19 mm, 45 × 0.8 mm
Tool or machine	Brand and model of tensioner, sealer or strapping machine	Your sealer model
Coil format	Steel winding, or plastic core size and coil weight	Oscillated; or 406 × 150 mm core, 20 kg
Certification	AAR, ASTM or EN requirement	AAR Open Top Loading Rules for rail
Destination and quantity	Port, monthly volume, how much strapping you need per shipment, packing	Containers per month

A photo of your current strap label or seal box is often the quickest way to confirm a size. You can check our certificates, ask for free samples to run in your tools, or send us your current specification and packaging needs, and we will match strap and seals to them.

FAQ

What Are the Standard Widths of Steel Strapping?

ASTM D3953-15 lists steel strapping widths of 3/8, 1/2, 5/8, 3/4, 1, 1-1/4 and 2 in. Palletizing and bundling mostly use 1/2, 5/8 and 3/4 in; steel coils and other heavy loads use 1-1/4 in. We produce 1/2 in to 2 in (12.7 to 50 mm).

How Thick Is Steel Strapping?

Most steel strapping is 0.015 to 0.035 in (0.38 to 0.89 mm) thick, and ASTM D3953-15 lists heavy-duty sizes up to 0.050 in (1.27 mm). 0.020 in and 0.023 in are the usual thicknesses for regular work, 0.028 to 0.035 in for heavier loads. Ours go up to 0.044 in on 1-1/4 in strap and 0.047 in (1.20 mm) on 2 in strap.

How Strong Is Poly Strapping?

In the US, "poly strapping" usually means PP. Our PP runs from about 50 kg (110 lbs) single-strap strength at 5 mm to 260 kg (573 lbs) at 19 mm. If you mean polyester (PET), it is much stronger: our PET runs from 157 kg (346 lbs) at 9 mm to 2,240 kg (4,938 lbs) at 32 mm.

What Sizes Does PP Strapping Come In?

We make PP strapping 5, 8, 9, 11, 12, 13, 15 and 19 mm wide and 0.30 to 0.95 mm thick, on rolls of about 1,330 to 7,000 m. In inches, that is roughly 3/16 in to 3/4 in.

What Is the Difference Between PET and PP Strapping?

PET is stronger, stretches less and has better retained tension. That strength and durability is why it goes on heavy pallets, bricks, timber and metal products, and is an alternative to steel on many loads. PP is lighter, weaker and lower in cost, and is used for cartons and light bundles. Our 12 mm PET is rated at 210–600 kg, against 105–180 kg for our 12 mm PP. More in PET vs PP strapping.
juhong-pet-strapping-brochure.pdf

juhong-steel-strapping-brochure.pdf

juhong-strapping-seals-brochure.pdf

PP strapping.pdf

Table of Content list

Sunny

Industrial Packaging Content Team | Technical Review by JUHONG Product Team

The JUHONG Industrial Packaging Content Team prepares practical packaging guides for overseas B2B buyers, distributors, factories, procurement managers, and packaging engineers. The content is based on JUHONG Packing Materials’ manufacturing experience since 1997 and reviewed with product knowledge covering steel strapping, PET strapping, stretch film, steel strapping seals, and related tools. Our goal is to help buyers understand specifications, compare materials, solve packaging problems, and