NextGen offers a heavy-duty line of specialized grips and fixtures for wood material testing, supporting universal testing machines (UTM) across industrial and academic laboratories. These components are engineered to meet the stringent standards of wood testing such as ASTM D198, ISO 3349, ISO 3340, and GB/T 1936.1, allowing accurate mechanical characterization under tension, shear, bending, and fastener withdrawal modes.
These fixtures are designed for compatibility with NG-EML and NG-SHM series UTMs and cover many sample dimensions and geometries found in engineered wood, structural panels, and fastener assemblies.
Six fixtures cover wood testing, and each answers a different question about the same material. The first is the plain tensile grip: side-action jaws, 10 kN, for pulling wood-based panels and boards apart along the specimen.
The NGB104B Tensile Grip is built for tension testing of wood-based panels and wooden boards. With a symmetrical grip structure, side-action clamping, and Φ10 mm pin compatibility, it offers a secure and reliable setup for low-force testing applications. Its heavy-duty construction supports up to 10 kN of force under ambient conditions.
| Parameter | Specification |
|---|---|
| Application | Tension test for wood-based panels and wooden board |
| Maximum Force Capacity | ≤ 10 kN |
| Upper Grip Weight | 8.4 lbs (3.82 kg) |
| Lower Grip Weight | 8.4 lbs (3.82 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Upper Grip Height (A) | 5.1″ (130 mm) |
| Lower Grip Height (B) | 5.1″ (130 mm) |
| Grip Width (C) | 6.3″ (160 mm) |
| Clamping Mode | Side action |
| Jaw Face | 60 mm × 40 mm |
The second does not pull, it shears. It is rated to 2 kN and is meant for glue lines - layered wood with adhesives, and interlaminar shear in fibreboard.
The NGB203A Shearing Fixture is developed for shearing tests on layered wood with adhesives and for interlaminar shear evaluation of fiber-reinforced plastics. This compact fixture provides stable performance at low force ranges, suited to adhesive bond strength studies and material delamination behavior in wood and composites.
| Parameter | Specification |
|---|---|
| Application | Shearing test for layered wood with adhesives and interlaminar shearing for fiber reinforce plastic |
| Maximum Force Capacity | ≤ 2 kN |
| Grip Weight | 0.56 kg |
| Working Temperature | Ambient |
| Grip Height (A) | 48 mm |
| Grip Height (B) | 54 mm |
| Jaw Face | 60 mm × 40 mm |
Dimensions A and B used in Table 2.The next two both measure bond strength at 10 kN, and the difference is where the bond is. This one takes a 50 x 50 mm specimen and pulls the panel apart through its thickness, which is what internal bond means.
The NGH104A Tensile Fixture is developed for evaluating the internal bond strength of wood specimens. With left and right grip assemblies, it accommodates small wood samples with high accuracy. This fixture is suitable for low-force applications and features compact symmetrical grips for 50 mm × 50 mm samples, tested under ambient conditions.
| Parameter | Specification |
|---|---|
| Application | Tension test for determination of internal bond strength of wood specimen |
| Maximum Force Capacity | ≤ 10 kN |
| Left Grips Weight | 4 lbs (1.8 kg) |
| Right Grips Weight | 3.7 lbs (1.7 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Left and Right Upper Grips Height (A) | 86 mm, 96 mm |
| Left and Right Lower Grips Height (B) | 66 mm, 80 mm |
| Left and Right Grips Width × Height (B) | 66 mm × 80 mm |
| Specimen Size | 50 mm × 50 mm |
Dimensions A and B used in Table 3.The companion fixture works on the surface instead: it measures how firmly the top layer holds, which is what a laminate or a coating fails at first.
The NGH104B Tensile Fixture is built for determining surface bond strength and surface soundness of wood specimens. With symmetrical left and right grips and precise clamping, this fixture supports small-format sample testing with a maximum capacity of 10 kN. It is optimized for ambient conditions and features standard Φ10 mm pin connections.
| Parameter | Specification |
|---|---|
| Application | Tension test for determination of surface bond strength and surface soundness of wood specimen |
| Maximum Force Capacity | ≤ 10 kN |
| Left Grip Weight | 3.4 lbs (1.56 kg) |
| Right Grip Weight | 3.4 lbs (1.56 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Left Grip Height (A) | 7.1″ (180 mm) |
| Right Grip Height (B) | 7.3″ (185 mm) |
| Left Grip Width (C) | 66 mm |
| Right Grip Width (D) | 69 mm |
The fifth is not about the wood at all but about what is driven into it. Rated to 500 N, it withdraws a nail or a screw and reports the force it took.
The NGB502A Tensile Fixture is purpose-built for withdrawing nails and screws from wood specimens. With a low force capacity and precise clamping system, this fixture is suited to testing fastener resistance in wood-based assemblies. Compact and lightweight, it supports accurate testing with a Φ10 mm pin connection in ambient environments.
| Parameter | Specification |
|---|---|
| Application | Used for withdrawing nail/screw from wood |
| Maximum Force Capacity | ≤ 500 N |
| Upper Grip Weight | 0.24 kg |
| Lower Grip Weight | 3.5 lbs (1.6 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Upper Grip Height | 95 mm |
| Lower Grip Height | 5.6″ (141 mm) |
| Grip Width (C) | 90 mm |
The last fixture bends rather than pulls: 10 kN across a specimen up to 90 mm wide. Its optional supports and rollers are listed in the two tables that follow its own.
The NGC104C Bending Fixture is engineered for 3-point and 4-point bending tests on wood-based panels and wooden boards. With a heavy-duty construction and high grip width (44.1″ (1120 mm)), it supports long-span testing with adjustable loading positions and spans. Suited to large-format material testing in ambient conditions.
| Parameter | Specification |
|---|---|
| Application | Bending test for wood-based panels and wooden board |
| Maximum Force Capacity | ≤ 10 kN |
| Weight | 96 lbs (43.5 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Lower Grip Height (A) | 9.1″ (230 mm) |
| Grip Width (B) | 44.1″ (1120 mm) |
| Upper Span (Adjustable) | ≤ 13.4″ (340 mm) |
| Lower Span (Adjustable) | ≤ 39.4″ (1000 mm) |
| Specimen Width | ≤ 90 mm |
Dimensions A and B used in Table 6.Roller (Optional)
| No. | Diameter (mm) | Width A (mm) |
|---|---|---|
| WZWC104C-07 | 10 | 92 |
| WZWC104C-11 | 15 | 92 |
| WZWC104C-13 | 30 | 92 |
Accessories, NGC104C Bending Fixture
Roller Support (Optional)
| No. | Diameter (mm) | Width A (mm) | Height B (mm) |
|---|---|---|---|
| NGC104C-06 | 10 | 45 | 20 |
| NGC104C-10 | 15 | 45 | 20 |
| NGC104C-16 | 30 | 49 | 20 |
Whether you’re testing wood for structural integrity, assessing fastener performance, or evaluating engineered timber properties, NextGen’s range of fixtures ensures maximum testing precision and compliance. All products are compatible with NG universal testing machines and supported by industry standards. Contact our technical team to configure the right setup for your wood testing application or to request a demonstration.
Need Additional Quality Control Equipment to Build Your Laboratory?
Gripping and fixturing is only one part of a complete quality control laboratory. NextGen can help you equip your entire lab with impact testers, notching and broaching systems, cooling chambers, tensile testers, hardness testers, specimen preparation equipment, and other supporting solutions, all coordinated as one complete project.
The wood range has six grips and fixtures, and each answers a different question about the material: tension along a panel or board, shear in glue lines, internal bond through the thickness, surface soundness, the withdrawal resistance of nails and screws, and bending in 3-point or 4-point loading.
The range is engineered to wood test standards such as ASTM D198 for static tests of lumber in structural sizes, ISO 3349 for the modulus of elasticity of wood in static bending and GB/T 1936.1 for its bending strength.
It covers the specimen sizes and geometries found in engineered wood, structural panels and fastener assemblies, in industrial and academic laboratories alike. The fixtures are designed for our NG-EML and NG-SHM series universal testing machines, and the tensile, bond, withdrawal and bending fixtures all connect through Ø10 mm pins.
Tension along wood-based panels and boards runs in the NGB104B tensile grip. It is a side-action grip with a symmetrical structure and 60 × 40 mm jaw faces, rated to 10 kN, with each half 130 mm high and weighing 3.82 kg.
Glue lines are tested in shear on a compact shearing fixture rated to 2 kN and weighing 0.56 kg. It is built for layered wood bonded with adhesives and for interlaminar shear in fiber-reinforced plastics, which suits it to adhesive bond strength studies and to the delamination behavior of wood and composites.
When the specimen is a composite laminate rather than wood, our composite grips and fixtures cover the dedicated shear and delamination methods.
Both measure how well a wood panel holds together in tension, and the difference is where. The NGH104A determines internal bond strength: it pulls a 50 × 50 mm specimen apart through its thickness, so the weakest plane inside the panel is the one that fails. Left and right grip assemblies hold the small sample.
The NGH104B works on the surface instead. It determines surface bond strength and surface soundness, which shows how firmly the top layer is anchored, and that is where a laminate or a coating fails first.
Both fixtures are rated to 10 kN. Panel producers usually check both properties, since internal bond describes the core of a board and surface soundness shows whether its face will hold a laminate or a coating.
The NGB502A withdraws a nail or a screw from a wood specimen and records the force it takes. It is rated to 500 N and built for testing how well fasteners hold in wood-based assemblies.
Withdrawal resistance is the force needed to pull a driven fastener straight out along its axis. It depends on the density and moisture content of the wood, on how deep the fastener goes and on its type, so it is measured on the combination actually used in the product.
The two halves differ: the upper grip weighs 0.24 kg and stands 95 mm high, while the lower grip weighs 1.6 kg and stands 141 mm high, with a width of 90 mm.
It takes boards up to 90 mm wide on a lower span of up to 1000 mm, at forces up to 10 kN. The NGC104C runs 3-point and 4-point bending on wood-based panels and boards, with the upper span adjustable up to 340 mm.
Four-point loading puts a constant bending moment between the two upper loading points, so a board fails at its weakest spot in that zone rather than under a single loading nose. At 1120 mm wide and 43.5 kg (96 lbs), the fixture is built for long-span, large-format testing.
Optional rollers and roller supports come in Ø10, Ø15 and Ø30 mm, so the radius can be matched to the specimen size and to the method you follow.
Share your board sizes and the span your standard specifies in a quote request, and we will list the rollers and supports to order with the fixture.
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