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Threaded fasteners

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001660
EISBN: 978-1-62708-236-5
...Abstract Abstract Failure analysis was performed on threaded Ti-6Al-4V fasteners that had fractured in the threads during installation. Scanning electron microscopy (SEM) and optical metallography revealed that the fractures initiated in circumferential shear bands present at the thread roots...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
...Abstract Abstract This article discusses different types of mechanical fasteners, including threaded fasteners, rivets, blind fasteners, pin fasteners, special-purpose fasteners, and fasteners used with composite materials. It describes the origins and causes of fastener failures...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001842
EISBN: 978-1-62708-241-9
... analysis, microhardness and tensile testing, stress calculations, and vibration measurements. Based on the results, the roll fracture was attributed to high-cycle fatigue associated with a plug weld over one of the five threaded fasteners added to secure a balance weight inside the roll. The balance weight...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001582
EISBN: 978-1-62708-233-4
... until the rod broke by overload. Changing the tolerance on the threads virtually eliminated the fatigue problem. Threaded fasteners Tolerance 4140 UNS G41400 Fatigue fracture Background The Failure The Evaluation Conclusions References References 1. IS 4218 (Part 4...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001649
EISBN: 978-1-62708-234-1
.... The macroscale appearance of the fracture is quasi-helical, suggesting some degree of torsional loading (common for a threaded fastener). Fig. 2 Higher magnification photograph of the fracture surface shown in Fig. 1 Stereoscopic examination of the fracture surfaces under oblique lighting...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001383
EISBN: 978-1-62708-215-0
...). The zinc plating exacerbated the situation by providing a strong local corrosion cell in the form of a sacrificial anode region adjacent to the cracked thread. The enhanced generation of hydrogen in a corrosive environment subsequently lead to HASC of the wheel studs. Case-hardened fasteners...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001678
EISBN: 978-1-62708-218-1
... one of several grades of carbon or alloy steels. Fatigue is the most common mechanism of failure in fasteners but sometimes more than one cause is involved in fracture, whether it is ductile or brittle. The most common locations for threaded fasteners to fracture are either in the head-to-shank-fillet...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0048596
EISBN: 978-1-62708-221-1
...Abstract Abstract SAE grade 5 U-bolts were used to fasten auxiliary dual wheels to the axles on a farm tractor. Under typical farm usage, the bolts are expected to have infinite life. However, several U-bolts made of 29 mm diam rod broke after less than 100 h of service. The bolt legs in which...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006432
EISBN: 978-1-62708-217-4
...Abstract Abstract A failed 25 x 32 mm (1 x 1 in.) cadmium-plated 1040 carbon steel countersunk head type nose gear door securing bolt with a common screwdriver slot was examined. Fracture originated at a thread root and propagated across the cross section. The topography of the fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0048592
EISBN: 978-1-62708-218-1
... of failure. Specifications for the threaded fasteners in the assembly called for 3 8 -24 UNF, SAE, grade 8, hexagon-head cap screws made of medium-carbon alloy steel, quenched and tempered to a hardness of 32 to 38 HRC and a minimum tensile strength of 1034 MPa (150 ksi). Fig. 1 Drive-line...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001306
EISBN: 978-1-62708-215-0
... Specifications The wheel studs were specified to be Grade 8.1 under SAE Standard J429, “Mechanical and Material Requirements for Externally Threaded Fasteners.” Medium-carbon alloy steels in general and alloy 1541 in particular meet the requirements of this standard. The torque requirement for both...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001824
EISBN: 978-1-62708-241-9
... an aggressive chemistry is allowed to develop and attack local surfaces. threaded fasteners corrosion chemical exposure stainless steel improper materials SEM analysis composition A193-B8S (manganese-silicon austenitic stainless steel) UNS S21800 A194 (chromium-molybdenum alloy steel...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001835
EISBN: 978-1-62708-241-9
... comes. It is also suggested that the bolt material should be changed to material with larger low-temperature fracture toughness, and thread-adhesive materials could be used on the fasteners to prevent loosening during service. Acknowledgment This study was supported by the Fundamental Research...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001703
EISBN: 978-1-62708-227-3
... , pp. 1091 – 1098 . 5. Blake A. , “Threaded Fasteners - Materials and Design” , Marcel Dekker Inc. , 1986 . 6. Brown B.F. , “Stress Corrosion Cracking Control Measures” , NBS Monograph 156 , 1977 . Selected Reference Selected Reference • Forms of Corrosion...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001830
EISBN: 978-1-62708-241-9
..., suggesting that the effects of fatigue-assisted corrosion had advanced to the point where one of the bolts fractured and broke free. The inertial unbalance produced excessive vibration, subjecting the remaining bolts to overload failure. threaded fasteners fracture corrosion fatigue chromium alloy...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001098
EISBN: 978-1-62708-214-3
... to the final fracture area were indicative of unidirectional, bending fatigue. The multiple origin sites indicated a high stress concentration. Fatigue is one of the most common failure mechanisms of threaded fasteners. It usually occurs in the first fully engaged thread root on the load side of the screw...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006784
EISBN: 978-1-62708-295-2
... stress due to assembly, consider externally threaded fasteners. When a bolt is threaded through holes in two pieces of sheet metal, it must be tightened to hold the components securely in place. While most threaded fastener installation specifications still call out a minimum torque, it is the tensile...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003552
EISBN: 978-1-62708-180-1
... and early-service fractures of commodity-grade steel components. In certain applications, where steels are processed so that their yield strength is a high percentage of their tensile strength (such as springs, spring clips, and externally threaded high-strength or self-tapping fasteners), hydrogen...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0090929
EISBN: 978-1-62708-236-5
... was sufficient to fracture the screws. No recommendations were made. Fasteners Installing Screw threads High-strength steel Ductile fracture One lot of size M5 × 0.8 mm, class 8.8 metric screws with a proprietary head design were failing during application. The screws were reportedly failing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001178
EISBN: 978-1-62708-235-8
...Abstract Abstract Eight cylinderhead screws cracked after a short running time in motors. They were made of Fe-0.45C-1Cr steel, had rolled threads, were heat treated to 110 kg/sq mm tensile strength, and were electrolytically galvanized. All fractured at the root of the thread. The surfaces...