Threaded Grips for Bolt and Nut Testing | NextGen Material Testing

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Standards

Accurate Tensile Testing of Fasteners with NextGen UTM Grips

NextGen Bolt and nut tensile grip - NGA105A

NextGen offers a specialized range of bolt and nut tensile grips designed for accurate tensile testing of threaded fasteners using universal testing machines (UTMs). These fixtures provide secure clamping and axial loading for bolts, studs, and nuts, for reliable testing under standardized procedures. The design accommodates high tensile forces while preventing slippage or thread stripping. All grips are engineered to meet international standards including ASTM F606, ISO 898, and DIN 50125, and are compatible with most industry test configurations.

This equipment is suited to quality control and research applications in sectors such as construction, automotive, aerospace, and manufacturing, where threaded fastener performance must be validated. Whether you are testing according to ISO, ASTM, or DIN protocols, these grips support compliance with precision and repeatability.

Bolt and Nut Tensile Grip Models

Two grips cover the range. They differ in force capacity, in the pin that mounts them and in the thread sizes they accept, so the choice follows the fastener you test and the frame you run it on. Each grip is listed with its own specification table, and the optional bushings, thimbles, wedges and mandrels that go with it follow underneath.

Model NGA105A

Bolt and Nut Tensile Grip

The NGA105A Bolt and Nut Tensile Grip is built for tensile testing of bolts and nuts, for compliance with GB/T 3098.1-2010 standards. With a 100 kN load capacity and compact structure, it’s suited to precision testing of fasteners across various thread sizes. This grip supports M5 to M18 threaded samples and requires a minimum bolt length of ≥2.5d. The unit is lightweight and compatible with Ø18 mm pin-mounted universal testing machines under ambient conditions.

**Table 1.** NGA105A Bolt and Nut Tensile Grip
Parameter	Specification
Application	Tension test for bolts and nuts
Maximum Force Capacity	100 kN
Grip Weight	Upper Grip: 19.8 lbs (9 kg) Lower Grip: 19.8 lbs (9 kg)
Working Temperature	Ambient
Standard	GB/T 3098.1-2010
Overall Height (H)	Upper Grip: 5.6 in (143 mm) Lower Grip: 5.9 in (149 mm)
Grip Width (W)	6.5 in (165 mm)
Connection Type	Upper Grip: Ø18 mm pin Lower Grip: Ø18 mm pin
Thread Specification	M5, M6, M8, M8×1, M10, M10×1.25, M12×1, M12×1.25, M14, M14×1.5, M18, M18×1.5
Minimum Bolt Length	L ≥ 2.5d

Thread bushings match internal thread sizes and are inserted into the grip body to ensure proper specimen alignment and load distribution during testing.

**Table 2.** Optional Thread Bushings - NGA105A Grip
No.	Specification	A (mm)	B (mm)	C (mm)
NGA105A-27	M5	27	53	32
NGA105A-14	M6	27	53	32
NGA105A-09	M8	27	53	32
NGA105A-26	M8×1.0	27	53	32
NGA105A-08	M10	27	53	32
NGA105A-15	M12	27	53	32
NGA105A-17	M12×1.0	27	53	32
NGA105A-18	M12×1.25	27	53	32
NGA105A-16	M14	27	53	32
NGA105A-24	M14×1.5	27	53	32
NGA105A-10	M18×1.5	27	53	32

NextGen Bolt and nut tensile grip - NGA105A - Size 2

Dimensions A, B and C used in Table 2.

Bolt thimbles serve as sleeves to accommodate bolts of varying outer thread diameters, enabling correct axial alignment and consistent loading during tests.

**Table 3.** Optional Thread Bushings - NGA105A Grip
No.	Specification	A (mm)	B (mm)	C (mm)
NGA105A-28	M5	27	53	32
NGA105A-19	M6	27	53	32
NGA105A-20	M8	27	53	32
NGA105A-21	M10	27	53	32
NGA105A-22	M12	27	53	32
NGA105A-23	M14	27	53	32
NGA105A-25	M18	27	53	32

NextGen Bolt and nut tensile grip - NGA105A - Size 3

Dimensions A, B and C used in Table 3.

When the fastener is larger or the break load runs past the capacity of the NGA105A, the second grip takes over. It uses a heavier body and a larger pin, and its accessory sets are listed separately below.

Model NGA305C

Bolt and Nut Tensile Grip

The NGA305C Bolt and Nut Tensile Grip is built for high-force tensile testing of bolts and nuts in compliance with GB/T 3098.1-2010 and GB/T 3098.2-2015 standards. With a rated load capacity of 300 kN and compatibility with many metric thread sizes from M3 to M22, this system is suited to advanced testing environments. The grip operates under ambient conditions and features Ø28 mm pin connections for easy integration with universal testing machines. It accommodates bolts with a minimum length of 2.5 times their nominal diameter.

NextGen Bolt and nut tensile grip - NGA305C

**Table 4.** NGA305C Bolt and Nut Tensile Grip
Parameter	Specification
Application	Tension test for bolts and nuts
Maximum Force Capacity	300 kN
Grip Weight	Upper Grip: 25.6 lbs (11.6 kg) Lower Grip: 25.6 lbs (11.6 kg)
Working Temperature	Ambient
Standard	GB/T 3098.1-2010GB/T 3098.2-2015
Overall Height (H)	Upper Grip: 7.8 in (197 mm) Lower Grip: 7.8 in (197 mm)
Grip Width (W)	4.6 in (118 mm)
Connection Type	Upper Grip: Ø28 mm pin Lower Grip: Ø28 mm pin
Thread Specification	M3, M4, M5, M6, M8, M8×1, M10, M10×1,M10×1.25, M12, M12×1.25, M12×1.5, M14, M14×1.5,M16, M16×1.5, M18, M18×1.5, M20, M20×1.5, M22
Minimum Bolt Length	L ≥ 2.5d

These optional thread bushings allow precise fitment for many bolt sizes and threads. Manufactured to high tolerances, each bushing ensures proper centering and alignment under test load.

**Table 5.** Optional Thread Bushings - NGA305C Grip
No.	Specification	A (mm)	B (mm)	C (mm)
NGA305C-07-01	M3	80	78	74
NGA305C-07-02	M4	80	78	72
NGA305C-07-03	M5	80	78	70
NGA305C-07-04	M6	80	78	68
NGA305C-07-05	M8×1	80	78	64
NGA305C-07-06	M8	80	78	64
NGA305C-07-07	M10×1	80	78	60
NGA305C-07-08	M10×1.25	80	78	60
NGA305C-07-09	M10	80	78	60
NGA305C-07-10	M12×1.25	80	78	58
NGA305C-07-11	M12×1.5	80	78	56
NGA305C-07-12	M12	80	78	56
NGA305C-07-13	M14×1.5	80	78	52
NGA305C-07-14	M14	80	78	52
NGA305C-07-15	M16×1.5	80	78	48
NGA305C-07-16	M16	80	78	48
NGA305C-07-17	M18×1.5	80	78	44
NGA305C-07-18	M18	80	78	44
NGA305C-07-19	M20×1.5	80	78	40
NGA305C-07-20	M20	80	78	40
NGA305C-07-21	M22×1.5	80	78	36
NGA305C-07-22	M22	80	78	36
NGA305C-07-23	M24×2	80	78	32
NGA305C-07-24	M24	80	78	32

These compact bushings offer reduced height and are suited to applications requiring space savings.

**Table 6.** Optional Thread Bushings - NGA305C Grip (Compact/Short Type)
No.	Specification	A (mm)	B (mm)	C (mm)
WLA305C-06-01	M3	22	78	3.5
WLA305C-06-02	M4	22	78	4.5
WLA305C-06-03	M5	22	78	5.5
WLA305C-06-04	M6	22	78	6.6
WLA305C-06-05	M8	22	78	9
NGA305C-06-06	M10	22	78	11
NGA305C-06-07	M12	22	78	13.5
NGA305C-06-08	M14	22	78	15.5
NGA305C-06-09	M16	22	78	17.5
NGA305C-06-10	M18	22	78	20
NGA305C-06-11	M20	22	78	22
NGA305C-06-12	M22	22	78	24
NGA305C-06-13	M24	22	78	26

The optional wedges provide optimal centering and load distribution for specific thread sizes. Each wedge is available in multiple entry angles (4°, 6°, 10°) to suit different test configurations. Manufactured from high-strength materials, these wedges enhance grip performance and prevent slippage during high-force tensile tests.

**Table 7.** Optional Wedges - NGA305C Grip
No.	Specification	A (mm)	B (mm)	C (°)
NGA305C-08-01	M3 - 4°	4	7	4
NGA305C-08-02	M3 - 6°	4	7	6
NGA305C-08-03	M3 - 10°	4	7	10
NGA305C-08-04	M4 - 4°	5	9	4
NGA305C-08-05	M4 - 6°	5	9	6
NGA305C-08-06	M4 - 10°	5	9	10
NGA305C-08-07	M5 - 4°	6	10	4
NGA305C-08-08	M5 - 6°	6	10	6
NGA305C-08-09	M5 - 10°	6	10	10
NGA305C-08-10	M6 - 4°	7	12	4
NGA305C-08-11	M6 - 6°	7	12	6
NGA305C-08-12	M6 - 10°	7	12	10
NGA305C-08-13	M8 - 4°	8	16	4
NGA305C-08-14	M8 - 6°	8	16	6
NGA305C-08-15	M8 - 10°	8	16	10
NGA305C-08-16	M10 - 4°	10	20	4
NGA305C-08-17	M10 - 6°	10	20	6
NGA305C-08-18	M10 - 10°	10	20	10
NGA305C-08-19	M12 - 4°	11	24	4
NGA305C-08-20	M12 - 6°	11	24	6
NGA305C-08-21	M12 - 10°	11	24	10
NGA305C-08-22	M14 - 4°	12	28	4
NGA305C-08-23	M14 - 6°	12	28	6
NGA305C-08-24	M14 - 10°	12	28	10
NGA305C-08-25	M16 - 4°	13	30	4
NGA305C-08-26	M16 - 6°	13	30	6
NGA305C-08-27	M16 - 10°	13	30	10
NGA305C-08-28	M18 - 4°	15	34	4
NGA305C-08-29	M18 - 6°	15	34	6
NGA305C-08-30	M18 - 10°	15	34	10
NGA305C-08-31	M20 - 4°	16	37	4
NGA305C-08-32	M20 - 6°	16	37	6
NGA305C-08-33	M20 - 10°	16	37	10
NGA305C-08-34	M22 - 4°	17	42	4
NGA305C-08-35	M22 - 6°	17	42	6
NGA305C-08-36	M22 - 10°	17	42	10
NGA305C-08-37	M24 - 4°	18	44	4
NGA305C-08-38	M24 - 6°	18	44	6
NGA305C-08-39	M24 - 10°	18	44	10

NextGen Bolt and nut tensile grip - NGA305C - Size 3

NextGen Bolt and nut tensile grip - NGA305C - Size 2

Dimensions A, B and C used in Table 7.

Mandrels are used for clamping bolt samples during tensile testing. These optional accessories match many thread sizes and ensure firm, axial alignment inside the fixture. The NGA305C mandrels are available for metric and fine threads ranging from M3 to M24×2.

**Table 8.** Optional Mandrels - NGA305C Grip
No.	Specification	A (mm)	B (mm)	C (mm)
NGA305C-09-01	M3	77	M16	10
NGA305C-09-02	M4	77	M16	10
NGA305C-09-03	M5	77	M16	16
NGA305C-09-04	M6	77	M16	16
NGA305C-09-05	M8×1	77	M16	20
NGA305C-09-06	M8	77	M16	20
NGA305C-09-07	M10×1	77	M16	25
NGA305C-09-08	M10×1.25	77	M16	25
NGA305C-09-09	M10	77	M16	25
NGA305C-09-10	M12×1.25	77	M16	30
NGA305C-09-11	M12×1.5	77	M16	30
NGA305C-09-12	M12	77	M16	30
NGA305C-10-01	M14×1.5	115	M24	35
NGA305C-10-02	M14	115	M24	35
NGA305C-10-03	M16×1.5	115	M24	35
NGA305C-10-04	M16	115	M24	35
NGA305C-10-05	M18×1.5	115	M24	40
NGA305C-10-06	M18	115	M24	40
NGA305C-11-01	M20×1.5	180	M30	45
NGA305C-11-02	M20	180	M30	45
NGA305C-11-03	M22×1.5	180	M30	45
NGA305C-11-04	M22	180	M30	45
NGA305C-11-05	M24×2	180	M30	45
NGA305C-11-06	M24	180	M30	45

NextGen Bolt and nut tensile grip - NGA305C - Size 5

NextGen Bolt and nut tensile grip - NGA305C - Size 4

Dimensions A, B and C used in Table 8.

NextGen’s bolt and nut tensile grips deliver consistent, accurate, and standard-compliant testing results. Whether you are validating mechanical properties of fasteners for R&D or certifying production batches, these grips integrate with NextGen’s universal testing machines. Contact us today to discuss configuration compatibility and order the right tensile grip set for your application.

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FAQs

How Do I Choose Between the 100 kN and 300 kN Threaded Grips?

Start with the break load of the strongest fastener you test. The NGA105A is rated to 100 kN (22,481 lbf) and the NGA305C to 300 kN (67,443 lbf), and the grip should sit comfortably above the highest load in your test plan.

Thread size narrows the choice. The NGA105A takes fasteners from M5 to M18, while the NGA305C covers M3 to M22, so small screws below M5 and bolts above M18 belong on the larger grip.

The frame settles the rest. The NGA105A connects through Ø18 mm pins and the NGA305C through Ø28 mm pins, so the larger grip needs a frame and load cell rated for 300 kN.

Send the sizes, pitches and property classes you test with a request for a quote, and our team will pair each fastener with the right grip and bushings.

Which Fastener Test Standards Do the Threaded Grips Meet?

Across the range the grips are engineered to meet ASTM F606, ISO 898 and DIN 50125. ASTM F606 covers the mechanical testing of externally and internally threaded fasteners, ISO 898 sets the mechanical properties of carbon and alloy steel fasteners, and DIN 50125 defines tensile test pieces for metallic materials.

Both grips are also built for GB/T 3098.1-2010, the standard for the mechanical properties of bolts, screws and studs, and the NGA305C complies with GB/T 3098.2-2015, its counterpart for nuts.

The tensile tests in these standards pull the specimen along its axis, and the grips are designed to carry high tensile forces without slippage or thread stripping.

They are used in construction, automotive, aerospace and manufacturing, from R&D on a new fastener to certifying production batches.

Which Fine-Pitch Threads Do the Threaded Grips Accept?

Both grips take fine-pitch metric threads as well as coarse ones. The pitch matters in testing because a fine-pitch bolt has a larger tensile stress area than a coarse bolt of the same nominal size, so at the same strength grade it carries a higher load before it breaks.

On the NGA305C the fine pitches run from M8×1 to M20×1.5, with two pitches each at M10 (M10×1 and M10×1.25) and at M12 (M12×1.25 and M12×1.5). The NGA105A covers fine threads such as M8×1, M12×1, M12×1.25, M14×1.5 and M18×1.5.

Each pitch has its own bushing, so an M12×1.25 bolt and a coarse M12 bolt use different bushings even though the nominal size is the same. When you plan a fastener program, list the pitch as well as the diameter for every size.

What Do the Thread Bushings and Bolt Thimbles Do in the 100 kN Threaded Grip?

They let one grip body take many fasteners. Thread bushings carry the internal thread that matches the fastener and fit into the grip body, so the bolt is centered and the load is spread evenly along the engaged thread. For the NGA105A we supply eleven optional bushings covering M5 to M18×1.5.

Bolt thimbles act as sleeves. They take bolts of different outer thread diameters, in seven sizes from M5 to M18, and hold them on the load axis so every bolt in a batch is loaded the same way.

Alignment is the reason for both parts. A fastener pulled off its axis picks up bending on top of tension, and the extra stress on one side of the thread lowers the load at which it fails.

Which Optional Accessories Are Offered for the 300 kN Threaded Grip?

The NGA305C has four optional sets, each listed by thread size. Standard thread bushings center the fastener under load, and a compact, short type with reduced height suits setups where space is tight.

Mandrels clamp bolt samples and hold them firmly on the axis inside the fixture, in metric and fine threads. Wedges help center the fastener, spread the load and prevent slippage at high force, and each size comes in three entry angles: 4°, 6° and 10°.

Angled wedges have a specific role in fastener testing. In the wedge tension test of ASTM F606 and ISO 898, a wedge under the bolt head loads the head at an angle, which checks that the junction between head and shank holds under combined tension and bending. The fastener standard sets the angle to use.

How Much Space Between the Crossheads Do the Threaded Grips Need?

Plan for the height of both grip halves plus the fastener. The NGA105A upper half stands 143 mm tall and the lower half 149 mm, both 165 mm wide, and each weighs 9 kg (19.8 lbs).

The NGA305C is taller and narrower, 197 mm high and 118 mm wide per half, and each half weighs 11.6 kg (25.6 lbs). Both grips work at ambient temperature.

Between the halves sits the fastener, which must be at least two and a half times as long as its nominal diameter on either grip, written L ≥ 2.5d. Add the two grips, the longest bolt and room to thread it in, and check that total against the free space between the crossheads of your universal testing machine.

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