Information on the most widely used ASTM standards within the materials testing industry
Model: UT1050-1, ASTM F543, ISO 6475 torsional, pullout, self-tapping, driving torque
Screw fatigue tester is a multi-functional composite test equipment according customer different test requirements, which can be used for screw rotary torque testing, self-tapping testing and other bone screw-related performance tests.
Measure the maximum fracture torque and break torque angle of the metal joint screw.
Fixture: The screw test fixture should be customized according to the customer's product According to the sample type, the front end uses a special chuck clamping specimen outer circle, the rear design fixture top rod shape and specimen center hole consistent (configuration of non-standard chuck tooling); Depending on the type and size of specimen, the top bar of the fixture is designed in different sizes.
General Introduction
Screw fatigue tester is a multi-functional composite test equipment according customer different test requirements, which can be used for screw rotary torque testing, self-tapping testing and other bone screw-related performance tests.
Measure the maximum fracture torque and break torque angle of the metal joint screw.
Fixture: The screw test fixture should be customized according to the customer's product According to the sample type, the front end uses a special chuck clamping specimen outer circle, the rear design fixture top rod shape and specimen center hole consistent (configuration of non-standard chuck tooling); Depending on the type and size of specimen, the top bar of the fixture is designed in different sizes.
Bone screws are the most common internal fixation device and used more then any other type of implant. Bone screws have various applications including driving various designs and sizes of screws. Manufacturers are required to perform device testing in accordance with ASTM F543 and ISO 6475 to determine the mechanical properties of the screw. The ASTM F543 test procedure outlines 4 tests that helps determine different characteristics of the metallic bone screw. Including the TORSIONAL PROPERTIES (A1), the insertion/removal torque (A2), the pullout strength (A3), and the axial compression load force of self-tapping bone screws (A4).

There are four primary testing methods outlined in the ASTM F543 testing standard, as follows:
A1(TORSIONAL PROPERTIES) – This test method is designed to find the breaking angle, maximum torque, and torsional yield strength of the Metallic Medical Bone Screw. The screw will be secured using a collet, and then a drill will be used to drive the specimen screw at the rate outlined in the ASTM F543 medical bone screw testing standard. The results of the test will be measured and cataloged.
A2( DRIVING TORQUE OF MEDICAL BONE SCREWS) – The A2 test is used to measure the insertion depth, insertion troque, axial load, and removal torque of a Metallic Medical Bone Screw. A test block is placed in a specialized clamping device, and a bone screw is lowered by a spindle into a pilot hole on the test block. Then, the bone screw is driven into the test block using torsional force. The maximum torque during these revolutions will be recorded. Next, the process is reversed. After this, the screw will be rotated in the opposite direction to remove it, and the maximum torque during these revolutions will be recorded.
A3 (AXIAL PULLOUT STRENGTH ) – This test is used to determine insertion depth and axial pullout strength. The bone screw is inserted into a test block that is secured into a frame as outlined in ASTM F543 standards. The head of the screw is gripped and subjected to a tensile load of 5 mm per minute. This will only stop once the screw is pulled out of the block or fails completely.
A4 (SELF-TAPPING PERFORMANCE) – This test provides information about axial load, maximum self-tap force, axial displacement, and maximum torque. A test block is clamped in place, and the Metallic Medical Bone Screw is lowered into a pilot hole on the test block and driven at a specified rotational rate. The compression force of the spindle driving the screw will continue to grow until the self-tapping feature of the screw engages and it begins driving into the test block. This load will then be maintained, and the screw will continue to be driven into the test block until a specified number of complete rotations has been achieved.
As experts in ASTM F543 testing, Empirical Technologies Corp simplifies the process of testing for Metallic Medical Bone Screws. At our testing facility, we can perform medical bone screw testing quickly and efficiently, which helps you bring your new products to market with fewer delays.
Key Features
1. ergonomic design, pleasant, suitable for human-machine, in line with the human-machine-environment system, efficient, healthy, comfortable and safe.
2. high rigidity, high stability, no vibration shock, streamlined load rack, rack size can be customized.
3. high-precision symmetrical torque sensor, linear width, good stability, to ensure the accuracy of torque load test.
4. high-speed, low vibration, maintenance-free, silent AC servo motor drive system.
5. built-in Ethernet interface, that is, stop-and-go function, flexible operation, free to switch.
6. circuit board adopts photoelectric isolation design, strong anti-jamming ability.
7. has a wide range of complete test fixtures for quick replacement, optional environmental systems and strain torsometers.
8. a wide range of torsion test speeds, choose from within 1r/min to 30r/min.
For bone screw torque performance, bone screw fracture twisting angle, bone screw axial pressure performance testing and research (metal bone screws, absorbable bone screws, self-attacking bone screws, myelin nails, etc.).
Torque performance tests and studies of different threaded bone screws (deep and light threads, full and semi-threaded, symmetrical and asymmetric threads).
Torque performance tests and studies of different thread codes and nominal diameter bone screws (HA/HB/HC/HD1.5-8.0mm).
Test and study of the performance of bone screws for different purposes (cortical bone screws, pine bone screws, V-shaped myelin nails, trilobular myelin nails, hollow screws).
Test and study of the performance of bone screw moments in different rotary forms (one-word groove, cross groove, inner hexagon, quad slot, inner triangle, plum shape).
Test and study of the performance of different head type bone screws (cone head, spherical head, semi-circular head, quad square head).
Testing and research on the torque performance of bone screws in different materials (stainless steel bone screws, absorbable bone screws, polytehride copolymers, L-propylene ester resins, ethyl ester resins, L-lactic acid resins, rigid polyurethane foams, hydrolyzed and degraded polymer resins, copolymers).
Built-in full digital closed-loop, multi-channel, multi-functional, easy-to-manipulate Bab103 twist test and control software , Russian standard, French standard, Australian standard, European standard, etc./GB, GJB, ISO, JIS, ASTM, DIN, BS, NF, EN, AS, NBR, IEC, GOST, CNS).
Automatic control of torque loads, automatic hold, cycle control and self-programming control.
maximum torque and maximum fracture torsional angle test, rot torque test, bone screw fracture position test, bone screw torsion yield strength test.
automatic tracking measurement of torque and torsional angle, showing test curves, torque values, torsional angles, and torsional speeds in real time.
automatic control of the test process, torque, stress, deformation, torsion angle full closed loop control, display, full keyboard input operation and control mode intelligent setup system.
control mode intelligent settings, control between the control mode without impact, smooth switching, loading, unloading smooth.
Process reproduction and data reanalysis, curve amplification, comparison, traversal, curves can be freely enlarged and reduced.
multi-curve display (torque-time curve, torque-torque angle curve, angle-time curve, etc.), coordinates are self-contained, fullness self-adjusting.
control software, modular, open programming, personalized design, can be adjusted.
standard modules: rights management module, test module, control module, analysis module, query module, output module, etc.
flexible Excel or Word reporting format to select, specify, sort, individually, merge, and multi-type output.
action tips and wizards.
network database management, can be directly linked with a number of networking companies.
automatic return at the end of the experiment, intelligent, efficient and fast.
ISO 6475:1989
Implants for surgery — Metal bone screws with asymmetrical thread and spherical under-surface — Mechanical requirements and test methods
ISO 5835:1991
Implants for surgery — Metal bone screws with hexagonal drive connection, spherical under-surface of head, asymmetrical thread — Dimensions
ISO 9268
Implants for surgery -- Metal bone screws with conical under-surface of head -- Dimensions
ASTM F543
Test Methods for Metallic Medical Bone Screws
ASTM F116
Standard Specification for Medical Screwdriver Bits
YY 0605.12-2016, YY 0605.9-2015, YY/T0605.5, YY/T0605.6, YY/T0605.7, YY 0605.12-2016, YY 0605.9-2015, YY/T0605.5, YY/T0605.6, YY/T0605.7, GB/T13810-2017, GB/T19701.2-2016, GB 4234.1-2017, ISO 5832, ISO 9268, ISO 5833, ISO 6475, ASTM F2502, ASTM F543, ASTM F116,
Test force overload protection, overcurrent, overpressure protection, safety protection when the specimen breaks,
operation prompt guide protection,
automatic protection at the end of the test, etc.
Stipulated the torque required to measure when a metal bone screw is screwed in and out of the standard material to confirm the consistency of the product under test. The constant force is maintained at 11.17N, at a rate of 3r/min, first screwed in 4 turns, then 4 turns out.
Test procedure:
Bone screws are inserted into and removed from a test block (may be predrilled); specifications to ASTM F1839; clamping via specimen grips.
Screw bits are mounted via a quick-acting chuck and the screw is driven at a test speed of 1 to 5 rpm in accordance with the standard. If required, a constant axial preload can be applied.
A minimum of four screw revolutions are required.
Result:
Insertion/removal torque versus angle for the entire duration of the test
Axial load force versus travel for entire duration of test
Insertion Depth
The test specifies a test method for measuring the axial force required for the extraction or failure of a metal bone screw from a specified material.
Test Procedure:
1, The bone screw should be inserted into the test block as specified in the standard (design to ASTM F1839) at an insertion speed of 3 rpm for 20 mm or 60% of the thread length.
2, While the test block is secured to the base of the frame, the screw head shall be gripped and a tensile load shall be applied at a rate of 5 mm/min until the screw fails or releases from the test block.
Result:
Insertion Depth
Axial Pullout Strength
The test specifies the axial pressure required to measure metal bone screws with self-tapping properties when screwing into the standard material to confirm the consistency of the product under test or to compare the relevant properties of different products of similar size.
Test Procedure:
1, Put the test block in the block clamp device. Load the bone screw specimen onto the driver. The specimen and driver are then lowered by the spindle into the pilot hole.
2, Conduct the test by driving the specimen using a rotational rate (the rotational speed of 30 rpm) .
3, The axial force is increased by 2.0 N/s during the insertion process until the torque or the axial travel increases significantly. At this point increasing axial-force shall conclude and the system should maintain the axial compressive force at which the self-tap was first noted.
4, Continue the rotation while maintaining axial load until the specified number of complete rotations have been achieved, thereby concluding that the specimen encompasses valid self-tap properties.
Result:
Axial Load
Maximum Self-Tap Force
Maximum Torque
Axial Displacement
Main Technical Specification
| Torque measuring range | 0-5N.m (10N.m optional) |
| Resolution | 0.001N.m |
| Torque sensor accuracy | Less than 0.5%F.S. |
| Speed accuracy | ±0.01mm/min |
| Axial force load cell | 200N/1000N (fulfill axial pull-out test) |
| Load cell accuracy | Less than 0.5%F.S. |
| Load cell resolution | 0.001N |
| Linear displacement sensor range | More than 50m |
| Displacement sensor accuracy level | Less than 0.5%F.S. |
| Displacement sensor resolution | 0.01mm |
| Torsion angle sensor | 99999 degrees |
| Torsional angle accuracy | ±0.2 degree |
| Torsion speed | 1r/min to 30r/min free adjusting |
| Effective travel | 400±10mm (can be increased on demand) |
| The coaxiality of the two chucks | ≤ 0.2mm |
| Standard Power | 220V, 50HZ, 1 phase, 0.4Kw |
| Working system | MS Win10 |
Main Accessories
| High Stiffness Frame | 1 set | |
| Servo motor/driver (Japan Panasonic) | 2 sets | |
| Torsion/tensile sensor (5Nm/200N) | 1 set | |
| Loadcel 1000N: (USA Vishay Celtron) | 1 set | |
| LVDT (Japan Tamagawa liner displacement sensor) | 1 set | |
| Test fixture (sample clamping fixture; V chuck; flat chuck) can left/right adjust position | 1 set | |
| Torsion test fixture | 1 set | |
| Data collection system | 2 sets | |
| Professional torsion testing software | 1 set | |
| Computer | 1 set | |
| Printer | 1 set | |
| Documents (Manual, packing list, certificate) | ||
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