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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 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...
Image
Published: 30 August 2021
Fig. 5 Section through the forged head of a threaded fastener. The uniform grain flow minimizes stress raisers and unfavorable shear planes. Source: Ref 7 More
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 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 and with illustrative...
Image
Published: 30 August 2021
Fig. 1 Types of failures in threaded and blind fasteners and in fastened sheet. Source: Ref 3 More
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006805
EISBN: 978-1-62708-329-4
... environmental effects, manufacturing discrepancies, improper use, or incorrect installation. Next, it describes fastener failure origins and fretting. Types of corrosion in threaded fasteners and their preventive measures are then covered. The performance of fasteners at elevated temperatures is addressed...
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
... threaded fasteners added to secure a balance weight inside the roll. The balance weight was installed to compensate for variations in wall thickness (i.e., weight distribution) of the pipe product used to make the roll. According to the investigation, resonance and vibration, which were initially...
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
... broke by overload. Changing the tolerance on the threads virtually eliminated the fatigue problem. Threaded fasteners Tolerance 4140 UNS G41400 Fatigue fracture Background Cylinder clamping rods, Fig. 1 , are used or clamping the cylinder block to the piston assembly in a single...
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
... 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 Fasteners Stress-corrosion...
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
... of changes in the thread surface condition (i.e., thread compounds, mechanical damage) was discernable. 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...
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
... 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 the inner and outer...
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.usage.c0090929
EISBN: 978-1-62708-236-5
... 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 at the normal installation...
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
... , 1977 . 4. Singbeil D. , and Tromans D. , Met Trans A , 13A , June 1982 , 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...
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 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 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 was excessively...
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
... 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 assembly that failed because...
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 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
... 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) ...
Image
Published: 01 June 2019
Fig. 1 Fracturing of high-strength screws. (a) Two grade 8 high-strength steel fasteners that failed on installation. (b) Necking and stretching between adjacent thread crests are evident on a cross section. Unetched. 8.9× More
Image
Published: 01 January 2002
Fig. 2 Fracturing of high-strength screws ( example 1 ). (a) Two grade 8 high-strength steel fasteners that failed on installation. (b) Necking and stretching between adjacent thread crests are evident on a cross section. Unetched. 8.9× More