NextGen’s bending fixtures are precision-engineered to enable accurate flexural testing of various materials, including metals, ceramics, composites, concrete, bricks, and construction products. These accessories are optimized for integration with NG-EML and other universal testing machines in our product line, for compatibility, durability, and repeatable results. All fixtures are compliant with international testing standards such as ASTM C1609, ASTM C78, ASTM C293, ISO 178, and EN 12808, so they are suitable for both R&D and quality control environments.
Each fixture is built for specific bending test applications such as 3-point or 4-point configurations, enabling laboratories to meet the most demanding flexural strength, deformation, and modulus testing requirements.
Eight fixtures split into two groups. The first two do four-point bending, where the load is shared by two rollers and the middle of the specimen sees a constant moment. This one holds 30 kN and is meant for natural stone and ceramics.
The NGB304 Bending Fixture series is built for accurate 4-point bending tests on natural stone, ceramics, and composite materials. With three model variations - NGB304A, NGB304B, and NGB304C - this system accommodates many specimen sizes and load requirements. Each fixture includes adjustable upper and lower spans, precision rollers, and is compatible with standard UTM systems.
| Parameter | NGB304A | NGB304B | NGB304C |
|---|---|---|---|
| Application | - Bending test for natural stone, ceramic, composite materials | ||
| Maximum Force Capacity | ≤ 30 kN | ≤ 30 kN | ≤ 30 kN |
| Upper Grip Weight | 33 lbs (15 kg) | 42 lbs (19 kg) | 49 lbs (22 kg) |
| Lower Grip Weight | 53 lbs (24 kg) | 77 lbs (35 kg) | 105 lbs (47.5 kg) |
| Working Temperature | Ambient | ||
| Connection - Upper Grip | Φ10 mm pin | Φ10 mm pin | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin | Φ10 mm pin | Φ10 mm pin |
| Upper Span (Adjustable) | ≤ 9.8″ (250 mm) | ≤ 15.7″ (400 mm) | ≤ 19.7″ (500 mm) |
| Lower Span (Adjustable) | ≤ 19.7″ (500 mm) | ≤ 31.5″ (800 mm) | ≤ 39.4″ (1000 mm) |
| Maximum Specimen Width | 6.3″ (160 mm) | 6.3″ (160 mm) | 6.3″ (160 mm) |
| Upper Grip Height (A) | 8.6″ (218 mm) | 8.6″ (218 mm) | 8.8″ (223 mm) |
| Lower Grip Height (B) | 7.3″ (185 mm) | 7.7″ (195 mm) | 8.1″ (205 mm) |
| Base Width (C) | 23.6″ (600 mm) | 35.4″ (900 mm) | 43.3″ (1100 mm) |
| Roller Diameter | Φ25 mm | Φ25 mm | Φ25 mm |
The second four-point fixture takes 100 kN, which is concrete territory. Its optional rollers and supports are listed in the two tables after its own.
The NGB105A Bending Fixture is engineered for high-capacity 4-point bending tests on ordinary concrete, metal, ceramic, and composite specimens. With heavy-duty Φ18 mm pin connections and a 100 kN force capacity, this fixture is well-suited for laboratories performing strength analysis on large structural materials. It supports both standard and non-standard specimen sizes.
| Parameter | Specification |
|---|---|
| Application | Bending test for ordinary concrete, metal, ceramic, composite |
| Maximum Force Capacity | ≤ 100 kN |
| Upper Grip Weight | 47 lbs (21.3 kg) |
| Lower Grip Weight | 86 lbs (38.9 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ18 mm pin |
| Connection - Lower Grip | Φ18 mm pin |
| Upper Span (Adjustable) | ≤ 7.9″ (200 mm) |
| Lower Span (Adjustable) | ≤ 18.9″ (480 mm) |
| Maximum Specimen Width | 6.3″ (160 mm) |
| Upper Grip Height (A) | 10.6″ (270 mm) |
| Lower Grip Height (B) | 10.2″ (259 mm) |
| Base Width (C) | 22.8″ (580 mm) |
| Roller Diameter | Φ30 mm |
| Standard Specimen | 5.9″ (150 mm) × 5.9″ (150 mm) × 600/21.7″ (550 mm) |
| Non-standard Specimen | 3.9″ (100 mm) × 3.9″ (100 mm) × 15.7″ (400 mm) |
Accessories, NGB105A Bending FixtureDeformation Measurement Device (Optional) This device allows real-time monitoring of specimen deformation during 4-point bending tests. It collects bending displacement data and enables calculation of the elastic modulus of the specimen for accurate mechanical property evaluation.
Roller (Optional)
| No. | Diameter (mm) | Width A (mm) |
|---|---|---|
| NGB105A-12 | 30 | 160 |
Accessories, NGB105A Bending Fixture
Roller Support (Optional)
| No. | Diameter (mm) | Width A (mm) | Height B (mm) |
|---|---|---|---|
| NGB105A-05 | 3 | 20 | 73 |
The remaining six are three-point fixtures, all rated to 20 kN, and they differ only in what they are set up to hold. Each comes with its own accessory tables. This one is for wall bricks.
The NGD204A 3-Point Bending Fixture is specifically developed for testing wall bricks, metal, ceramics, and composite materials under flexural load. Its compact form and adjustable span up to 7.9″ (200 mm) make it suited to laboratories conducting strength evaluation of structural and brittle materials. The fixture supports both small and medium-sized specimens and operates under ambient temperature.
| Parameter | Specification |
|---|---|
| Application | Bending test for wall bricks, metal, ceramic, composite |
| Maximum Force Capacity | ≤ 20 kN |
| Upper Grip Weight | 7.1 lbs (3.2 kg) |
| Lower Grip Weight | 28 lbs (12.7 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Span (Adjustable) | ≤ 7.9″ (200 mm) |
| Maximum Specimen Width | 90 mm |
| Upper Grip Height (A) | 4.8″ (123 mm) |
| Lower Grip Height (B) | 7.2″ (184 mm) |
| Base Width (C) | 11.8″ (300 mm) |
| Roller Diameter | Φ30 mm |
| Standard Specimen | 7.5″ (190 mm) × 35 mm × 90 mm 9.4″ (240 mm) × 4.5″ (115 mm) × 53 mm |
Roller (Optional)
| No. | Diameter (mm) | Width A (mm) |
|---|---|---|
| WZWD204A-03 | 30 | 120 |
Accessories, NGD204A Bending Fixture
Roller Support (Optional)
| No. | Diameter (mm) | Width A (mm) | Height B (mm) |
|---|---|---|---|
| NGD204A-04 | 30 | 20 | 50 |
The same fixture arranged for precast concrete paving units.
The NGD204B 3-Point Bending Fixture is optimized for testing precast concrete paving bricks as well as metals, ceramics, and composite materials. With a span adjustable up to 15.7″ (400 mm) and a high-strength lower grip, it accommodates larger specimens under medium-load bending. Its structure ensures stability and compatibility with standard UTM systems.
| Parameter | Specification |
|---|---|
| Application | Bending test for precast concrete paving bricks, metal, ceramic, composite |
| Maximum Force Capacity | ≤ 20 kN |
| Upper Grip Weight | 7.1 lbs (3.2 kg) |
| Lower Grip Weight | 44 lbs (20 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Span (Adjustable) | ≤ 15.7″ (400 mm) |
| Maximum Specimen Width | 4.8″ (123 mm) |
| Upper Grip Height (A) | 7.3″ (185 mm) |
| Lower Grip Height (B) | 19.7″ (500 mm) |
| Base Width (C) | 90 mm |
| Roller Diameter | Φ30 mm |
Roller (Optional)
| No. | Diameter (mm) | Width A (mm) |
|---|---|---|
| WZWD204B-02 | 30 | 210 |
Accessories, NGD204B Bending Fixture
Roller Support (Optional)
| No. | Diameter (mm) | Width A (mm) | Height B (mm) |
|---|---|---|---|
| NGD204B-01 | 30 | 20 | 50 |
For gypsum plasterboard, where the specimen is wide, thin and easy to crack.
The NGD204C 3-Point Bending Fixture is built for flexural strength testing of gypsum plasterboard, metal, ceramics, and composite materials. Featuring a wide specimen compatibility (up to 12.2″ (310 mm)) and lightweight upper grip, this fixture is suited to testing fragile and large-format specimens under low to medium force. Its compact roller system and stable base design ensure reliable and repeatable results.
| Parameter | Specification |
|---|---|
| Application | Bending test for gypsum plasterboard, metal, ceramic, composite |
| Maximum Force Capacity | ≤ 20 kN |
| Upper Grip Weight | 7.5 lbs (3.4 kg) |
| Lower Grip Weight | 44 lbs (20 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Span (Adjustable) | ≤ 15.7″ (400 mm) |
| Maximum Specimen Width | 12.2″ (310 mm) |
| Upper Grip Height (A) | 4.5″ (114 mm) |
| Lower Grip Height (B) | 6.9″ (176 mm) |
| Base Width (C) | 13.8″ (350 mm) |
| Roller Diameter | Φ20 mm |
Roller (Optional)
| No. | Diameter (mm) | Width A (mm) |
|---|---|---|
| NGD204C-02 | 20 | 310 |
Accessories, NGD204C Bending Fixture
Roller Support (Optional)
| No. | Diameter (mm) | Width A (mm) | Height B (mm) |
|---|---|---|---|
| NGD204C-01 | 20 | 20 | 50 |
For fibre cement products.
The NGD204D 3-Point Bending Fixture is engineered for testing fiber cement products, metals, ceramics, and composite materials. It supports specimen widths up to 10.2″ (260 mm) and features a compact roller system. With a lightweight upper grip and a strong base, it provides a stable and efficient setup for mid-range bending applications in ambient conditions.
| Parameter | Specification |
|---|---|
| Application | Bending test for fiber cement products, metal, ceramic, composite |
| Maximum Force Capacity | ≤ 20 kN |
| Upper Grip Weight | 5.1 lbs (2.3 kg) |
| Lower Grip Weight | 32 lbs (14.4 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Span (Adjustable) | ≤ 9.4″ (240 mm) |
| Maximum Specimen Width | 10.2″ (260 mm) |
| Upper Grip Height (A) | 4.2″ (106 mm) |
| Lower Grip Height (B) | 6.6″ (168 mm) |
| Base Width (C) | 13.8″ (350 mm) |
| Roller Diameter | Φ10 mm |
Roller (Optional)
| No. | Diameter (mm) | Width A (mm) |
|---|---|---|
| NGD204D-02 | 10 | 260 |
Accessories, NGD204D Bending Fixture
Roller Support (Optional)
| No. | Diameter (mm) | Width A (mm) | Height B (mm) |
|---|---|---|---|
| NGD204D-01 | 10 | 20 | 50 |
For fired roofing tiles, which are curved rather than flat.
The NGD204E 3-Point Bending Fixture is built for testing fired roofing tiles, metals, ceramics, and composite materials. With a wide specimen accommodation of up to 13.8″ (350 mm) and durable Φ10 mm pin-mounted grips, this fixture is suited to evaluating the flexural strength of brittle and structural materials under ambient conditions.
| Parameter | Specification |
|---|---|
| Application | Bending test for fired roofing tiles, metal, ceramic, composite |
| Maximum Force Capacity | ≤ 20 kN |
| Upper Grip Weight | 9.5 lbs (4.3 kg) |
| Lower Grip Weight | 43 lbs (19.5 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Span (Adjustable) | ≤ 11.8″ (300 mm) |
| Maximum Specimen Width | 13.8″ (350 mm) |
| Upper Grip Height (A) | 4.1″ (105 mm) |
| Lower Grip Height (B) | 6.6″ (168 mm) |
| Base Width (C) | 15.7″ (400 mm) |
| Roller Diameter | Φ20 mm |
Roller (Optional)
| No. | Diameter (mm) | Width A (mm) |
|---|---|---|
| NGD204C-04 | 25 | 350 |
Accessories, NGD204E Bending Fixture
Roller Support (Optional)
| No. | Diameter (mm) | Width A (mm) | Height B (mm) |
|---|---|---|---|
| NGD204C-01 | 25 | 20 | 50 |
And the last for inorganic rigid thermal insulation boards.
The NGD204F 3-Point Bending Fixture is optimized for evaluating the flexural behavior of inorganic rigid thermal insulation foam, metals, ceramics, and composite materials. With a medium-width capacity and balanced grip design, it provides accurate and reliable support for low-to-medium force bending tests under ambient conditions.
| Parameter | Specification |
|---|---|
| Application | Bending test for inorganic rigid thermal insulation foam, metal, ceramic, composite |
| Maximum Force Capacity | ≤ 20 kN |
| Upper Grip Weight | 6 lbs (2.7 kg) |
| Lower Grip Weight | 36 lbs (16.3 kg) |
| Working Temperature | Ambient |
| Connection - Upper Grip | Φ10 mm pin |
| Connection - Lower Grip | Φ10 mm pin |
| Span (Adjustable) | ≤ 11.8″ (300 mm) |
| Maximum Specimen Width | 6.3″ (160 mm) |
| Upper Grip Height (A) | 4.8″ (123 mm) |
| Lower Grip Height (B) | 7.3″ (185 mm) |
| Base Width (C) | 15.7″ (400 mm) |
| Roller Diameter | Φ30 mm |
Roller (Optional)
| No. | Diameter (mm) | Width A (mm) |
|---|---|---|
| NGD304A-09 | 30 | 160 |
Accessories, NGD204F Bending Fixture
Roller Support (Optional)
| No. | Diameter (mm) | Width A (mm) | Height B (mm) |
|---|---|---|---|
| NGD304A-06 | 30 | 20 | 50 |
NextGen’s wide array of bending fixtures allows laboratories and manufacturers to conduct standardized flexural testing across a range of materials and specimen geometries. Whether you need a compact solution for classroom training or a heavy-duty fixture for industrial-grade testing, we offer the right product for your universal testing machine. All bending fixtures are precision-calibrated, quality-verified, and available with rapid shipping across North America.
Contact our team today to request a quote, verify compatibility with your system, or schedule a demonstration.
Need Additional Quality Control Equipment to Build Your Laboratory?
Flexural and bend testing 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.
Choose four-point bending when the material is brittle and its strength depends on flaws spread through it, as in natural stone, ceramics and concrete. In three-point bending the peak moment sits under the single loading nose, so the specimen is tested mainly along that one line.
With two loading rollers the load is shared and the middle of the specimen carries a constant moment, so the whole zone between the upper rollers is tested at the same stress and the specimen breaks at its weakest flaw. That result is more representative of the material and usually lower than a three-point value.
In this range the four-point fixtures are the 30 kN series for natural stone and ceramics and the 100 kN fixture for concrete, and six 20 kN three-point fixtures are each set up for one building product. For plastics, see our 3-point bending fixtures for flexural testing.
Each of the six three-point fixtures is rated to 20 kN (4,496 lbf) and set up for one building product, so the product you test decides the model. The wall brick fixture spans up to 200 mm, and the fixture for precast concrete paving units spans up to 400 mm and takes specimens up to 123 mm wide.
For boards and tiles the width matters as much as the span. The gypsum plasterboard fixture spans up to 400 mm and takes boards up to 310 mm wide, the fiber cement fixture 240 mm and 260 mm, and the fixture for curved fired roofing tiles 300 mm and 350 mm.
Inorganic rigid thermal insulation boards go on a fixture that spans up to 300 mm and takes specimens up to 160 mm wide.
List the products you test and their dimensions in a request for quotation, and our team will select the fixtures and optional rollers for your frame.
It runs the third-point loading of ASTM C78 for the flexural strength of concrete, and ASTM C1609 applies the same loading to fiber-reinforced concrete. The fixture is rated to 100 kN (22,481 lbf) and mounts on Ø18 mm pins.
The standard specimen has a 150 × 150 mm cross-section, and a 100 × 100 × 400 mm beam is accepted as a non-standard size. The lower span adjusts up to 480 mm and the upper span up to 200 mm, the rollers are Ø30 mm, and beams up to 160 mm wide fit.
The result is the modulus of rupture. Concrete is far weaker in tension than in compression, and a beam in bending fails from its tension face, so pavement and slab designers work from this flexural strength.
All three NGB304 models carry 30 kN (6,744 lbf) and take specimens up to 160 mm wide on Ø25 mm rollers, so the choice comes down to specimen length. The NGB304A has a lower span of up to 500 mm and an upper span of up to 250 mm, the NGB304B 800 mm and 400 mm, and the NGB304C 1000 mm and 500 mm.
Both spans adjust on every model, so the loading span and support span can be set to the ratio your standard specifies for stone, ceramic or composite specimens.
The fixtures grow with the span: their bases are 600, 900 and 1100 mm wide and their lower halves weigh 24, 35 and 47.5 kg, which is worth checking against the space and lifting arrangements in your laboratory. All three connect on Ø10 mm pins.
The 100 kN four-point fixture accepts an optional deformation measurement device that monitors the specimen in real time during the test. It collects the bending displacement, and from that data the elastic modulus of the specimen can be calculated along with its flexural strength.
Four-point loading suits this measurement. Between the two upper rollers the specimen is in pure bending, with a constant moment and no shear force, so the deflection measured there reflects bending alone and gives the modulus directly.
Measuring on the specimen also keeps the frame, load cell and fixture out of the reading, while crosshead travel includes their compliance and makes the modulus read low. For concrete, ceramics and composites that deflect very little before they break, that difference is a large share of the result.
The roller diameter follows the product being tested. The fiber cement fixture uses Ø10 mm rollers, the gypsum plasterboard fixture Ø20 mm, and the fixtures for wall bricks, concrete paving units and insulation boards Ø30 mm.
Product standards set the roller size for each material. A thick or porous unit needs a larger roller to spread the contact force, so the roller does not crush the surface locally before the specimen breaks in bending, while a thin sheet is loaded well by a smaller roller.
Each fixture also has an optional roller and roller support listed in its own table, with rollers made as wide as the specimen: 310 mm for plasterboard and 260 mm for fiber cement. A roller that covers the full width keeps the line load even across a wide board.
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