CN104963927A - Flanging and riveting self-locking nut and machining method thereof - Google Patents
Flanging and riveting self-locking nut and machining method thereof Download PDFInfo
- Publication number
- CN104963927A CN104963927A CN201510302005.4A CN201510302005A CN104963927A CN 104963927 A CN104963927 A CN 104963927A CN 201510302005 A CN201510302005 A CN 201510302005A CN 104963927 A CN104963927 A CN 104963927A
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- Prior art keywords
- locking nut
- cone
- riveting self
- self
- locking
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- Pending
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000003754 machining Methods 0.000 title abstract 3
- 238000005242 forging Methods 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims abstract description 9
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 230000007306 turnover Effects 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 8
- 238000003672 processing method Methods 0.000 claims description 8
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000010962 carbon steel Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 229910001339 C alloy Inorganic materials 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000007747 plating Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
- F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
- F16B37/06—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
- F16B37/062—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting
- F16B37/068—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting by deforming the material of the support, e.g. the sheet or plate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/284—Locking by means of elastic deformation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a flanging and riveting self-locking nut and a machining method thereof. The flanging and riveting self-locking nut is a reducing cylinder body in appearance. The middle section of the reducing cylinder body is a large cylinder 1. A cone 2 is arranged at one end of the large cylinder, and a small cylinder 3 is arranged at the other end of the large cylinder. A reducing hole is formed in the middle of the reducing cylinder body. A large hole 4 is formed in the small cylinder. A small threaded hole 5 is formed in the large cylinder and the cone. The large hole and the small threaded hole are in transition through a chamfer 6. Locking grooves 7 evenly distributed along the circumference are formed in the cone. According to the flanging and riveting self-locking nut and the machining method thereof, an important new product is added to the field of fastening connecting pieces, threaded connecting and riveting are integrated through the structure of the flanging and riveting self-locking nut, threaded screwing can be conducted without the cooperation of external force during assembling, materials are saved in the application of the automatic locking and die forging technology, time is saved, high efficiency is achieved, the safe reliability is high, the mechanical performance is stable, and maintenance is convenient.
Description
Technical field
the present invention relates to one and turn over riveting self-locking nut and processing method thereof, belong to fastening piece processing technique field.
Technical background
along with the raising gradually of Performance of Mechanical Products, the requirement of fastening piece is also more and more higher.Not only require that fastening piece possesses several functions, and the volume of fastening piece, weight, intensity all had higher requirements, also in some engineering goods, for fastening piece require can not with Product jointing, and require to possess good locking property.The processing of existing this kind of fastening piece mainly adopts machined into complete, and machined into is got up cumbersome, and efficiency is low, the high needs that cannot meet develop rapidly of cost.
Summary of the invention
goal of the invention of the present invention is: provide one to turn over riveting self-locking nut and processing method thereof, and get up cumbersome to solve prior art processing, efficiency is low, the high problem that cannot meet develop rapidly needs of cost, thus overcomes the deficiencies in the prior art.
technological scheme of the present invention is achieved in that
one of the present invention turns over riveting self-locking nut, described in turn over riveting self-locking nut profile be reducing cylindrical body, the cylindrical stage casing of reducing is big column, and big column one end is cone, and the big column the other end is small column; Being provided with reducing hole in the middle of reducing cylindrical body, is macropore in small column, and being minor thread hole in big column and cone, is chamfered transition between macropore and minor thread hole; Cone is provided with the locking slot be uniformly distributed along the circumference.
aforementionedly turn in riveting self-locking nut, the connection of described big column and cone and small column is that arc transition connects.
aforementionedly turn in riveting self-locking nut, described minor thread hole is metric thread, inch screw thread, U.S. standard screw thread, whitworth thread or MJ screw thread.
aforementionedly turn in riveting self-locking nut, described cone is that end is little, the closing in circular cone that root is large, and conical surface gradient gets 3 ~ 5 °; The distance closed up at the bottom of end cylindrical and minor thread hole between footpath is 0.5 ~ 0.8mm.
aforementionedly turn in riveting self-locking nut, the distance ≮ 6mm at the bottom of described big column cylindrical and minor thread hole between footpath.
aforementionedly turn in riveting self-locking nut, the wall thickness of described roundlet styletable is 1 ~ 1.5mm.
aforementionedly turn in riveting self-locking nut, the distance at the bottom of described macropore inwall and minor thread hole between footpath is 0.5 ~ 1.5mm.
for above-mentioned of the present invention a kind of processing method of turning over the processing of riveting self-locking nut be, the method adopts the direct die-forging forming blank of metal bar that plasticity is good, metal grain does not rupture after die-forging forming, crystal grain is the linear alignment along its length, then turns over riveting self-locking nut through machine flinishing and shaping the making of cold deformation; Described plasticity is good, metal grain does not rupture after die-forging forming, the metal bar of crystal grain along its length in the linear alignment is structural carbon steel or Alloy Constructional Steel.
in foregoing process, above-mentioned structural carbon steel comprises ML30 and ML35 bar; Above-mentioned Alloy Constructional Steel comprises 30CrMnSiA, 40CrNiMoA and 40Cr bar.
in foregoing process, described through machine flinishing with cold deformation is shaping refers to that the semi-finished product after machine flinishing after heat treatment adopt cold pressing technology, make to be positioned at the locking slot turned on riveting self-locking nut cone and produce larger contraction deformation.
owing to have employed technique scheme, compared with prior art, the present invention is provided with locking slot on cone in the present invention, and locking slot is determined by the locking torque turning over the requirement of riveting self-locking nut, and groove depth, groove width increase and corresponding increase with locking torque.During riveted joint, be riveted on riveted plating, produce anti-torque while playing riveted joint effect by small column upset, carry out screw thread screw during assembling without the need to external force cooperation, therefore without the need to twisting space, the present invention will turn over riveting technology and be applied to locking class fastener areas.The present invention makes the locking slot size adduction on cone by cold pressurizing and deformation, locking slot groove width narrows, and the point substituting prior art closes up, and the larger locking property of area of contact is good compared with a closing in.Improve elastic properties of materials through heat treatment after closing in, utilize elasticity to reach locking object, change conventional dependence deformation of products generation magnitude of interference and reach locking effect, scientific and reasonable the making full use of of the resilient property of material own.
therefore the present invention is that fastening connection piece field increases again an important new product.The structure of turning over riveting self-locking nut achieved be threaded and rivet integrated, coordinating without the need to external force during assembling and carry out screw thread and screw, realize auto lock, the application of swaging technique saves material, time-saving and efficiency, safety reliability is high, stable mechanical performance, easy to maintenance.
figure of description
fig. 1 is structural representation of the present invention;
fig. 2 is size requirement schematic diagram of the present invention;
fig. 3 is application example schematic diagram of the present invention.
being labeled as in accompanying drawing: 1-big column; 2-cone; 3-small column; 4-macropore; 5-minor thread hole; 6-chamfering; 7-locking slot; 8-circular arc; 9-riveted plating; 10-turns over riveting self-locking nut; 11-bolt.
Embodiment
below in conjunction with drawings and Examples, the present invention is described in further detail, but not as any limitation of the invention.
one of the present invention turns over riveting self-locking nut, and as illustrated in fig. 1 and 2, this profile of turning over riveting self-locking nut is reducing cylindrical body, and the cylindrical stage casing of reducing is big column 1, and big column 1 one end is cone 2, and big column 1 the other end is small column 3; Being provided with reducing hole in the middle of reducing cylindrical body, is macropore 4 in small column 3, and being minor thread hole 5 in big column 1 and cone 2, is chamfering 6 transition between macropore 4 and minor thread hole 5; Cone 2 is provided with the locking slot 7 be uniformly distributed along the circumference.Big column 1 is that circular arc 8 transition connects with the connection of cone 2 and small column 3.Minor thread hole 5 is metric thread, inch screw thread, U.S. standard screw thread, whitworth thread or MJ screw thread.Cone 2 is that end is little, the closing in circular cone that root is large, and conical surface gradient gets 3 ~ 5 °; The distance closed up between end cylindrical and footpath, the end, minor thread hole 5 is 0.5 ~ 0.8mm.Distance ≮ 6mm between big column 1 cylindrical and footpath, the end, minor thread hole 5.The wall thickness of small column 3 end is 1 ~ 1.5mm.Distance between macropore 4 inwall and footpath, the end, minor thread hole 5 is 0.5 ~ 1.5mm.
for above-mentioned of the present invention a kind of processing method of turning over the processing of riveting self-locking nut be, the method adopts plasticity good, metal grain does not rupture after die-forging forming, crystal grain along its length in the direct die-forging forming blank of metal bar of the linear alignment, then through machine flinishing with cold deformation is shaping makes.Described plasticity is good, and metal grain does not rupture after die-forging forming, and the metal bar of crystal grain along its length in the linear alignment comprises structural carbon steel and Alloy Constructional Steel; Structural carbon steel comprises ML30 and ML35 bar; Alloy Constructional Steel comprises 30CrMnSiA, 40CrNiMoA and 40Cr bar.Through machine flinishing with cold deformation is shaping refers to that the semi-finished product after machine flinishing after heat treatment adopt cold pressing technology, the locking slot be positioned on cone is made to produce larger contraction deformation.
Embodiment
manufacture method of the present invention is the application direct die forging of bar molded blank, shaping through machine flinishing, cold deformation.Its theoretical foundation adopts plasticity good, and its crystal grain does not rupture after die-forging forming, and crystal grain is the linear alignment, i.e. the material of the even full height orientation of grain flow line, and this type of material upsetting is good, can obtain arbitrary shape blank.Common used material has structural carbon steel (as: ML30, ML35), Alloy Constructional Steel (as: 30CrMnSiA, 40CrNiMoA) etc.
what the present invention processed turns over riveting self-locking nut, and as illustrated in fig. 1 and 2, the profile of turning over riveting self-locking nut is reducing cylindrical body, and the cylindrical stage casing of reducing is big column 1, and big column 1 one end is cone 2, and big column 1 the other end is small column 3; Being provided with reducing hole in the middle of reducing cylindrical body, is macropore 4 in small column 3, and being minor thread hole 5 in big column 1 and cone 2, is chamfering 6 transition between macropore 4 and minor thread hole 5; Cone 2 is provided with the locking slot 7 be uniformly distributed along the circumference.
specifically add man-hour, in Fig. 1, big column 1 diameter dimension is determined according to the core diameter of thread in minor thread hole 5, and big column 1 diameter should be greater than the core diameter of thread at least 6mm in minor thread hole 5.Cone 2 gradient is 3 ° ~ 5 °.Cone 2 closes up conical surface self-assembling formation.The closing in end wall of cone 2 is thick is 0.5 ~ 0.8mm, and requires that smooth surface is attractive in appearance.Locking slot 7 is determined by the locking torque turning over the requirement of riveting self-locking nut, and groove depth, groove width increase and corresponding increase with locking torque.Locking slot 7 makes closing in conical surface size adduction by cold pressurizing and deformation, and locking slot groove width narrows, and after heat treatment, elastic properties of materials increases, and utilizes elasticity to reach the object of locking, and change conventional point and close up, the larger locking property of area of contact is good compared with a closing in.Circular arc 8 transition in Fig. 1 only otherwise produce wedge angle, in order to avoid stress is concentrated and ftracture during heat treatment.Minor thread hole 5 can adopt any one specification in metric thread, inch screw thread, U.S. standard screw thread, whitworth thread and MJ screw thread.The wall thickness that small column is 3 sections is good with 1 ~ 1.5mm, and the too thin riveting intensity of wall thickness is inadequate, and the too thick riveting manufacturability difference of turning over of wall thickness is easy to crack.Diameter macropores in Fig. 1 is just greater than the core diameter of thread 1 ~ 3mm in minor thread hole 5, not affect the smooth assembling of bolt after guaranteeing to turn over riveting.
the length that small column is 3 sections is determined according to the thickness of riveted plating and riveting intensity, when riveted plating is thicker, requires the corresponding lengthening of length dimension of the higher then small column of riveting intensity 3 sections.
fig. 3 is application example figure of the present invention, as seen from Figure 3, of the present invention turn over riveting self-locking nut 10 assemble time without the need to twisting space: outwards overturn by small column and rivet with riveted plating 9, anti-torque can be produced after riveting is good, carry out bolt 11 without the need to external force cooperation during assembling to screw, therefore without the need to twisting space.Method of the present invention makes locking slot size adduction by cold pressurizing and deformation, and locking slot groove width narrows, and after heat treatment, elastic properties of materials increases, and utilizes elasticity to reach the object of locking, and change conventional point and close up, the larger locking property of area of contact is good compared with a closing in.
Claims (10)
1. turn over a riveting self-locking nut, it is characterized in that: described in turn over riveting self-locking nut profile be reducing cylindrical body, the cylindrical stage casing of reducing is big column (1), and big column (1) one end is cone (2), and big column (1) the other end is small column (3); Being provided with reducing hole in the middle of reducing cylindrical body, is macropore (4) in small column (3), and being minor thread hole (5) in big column (1) and cone (2), is chamfering (6) transition between macropore (4) and minor thread hole (5); Cone (2) is provided with the locking slot (7) be uniformly distributed along the circumference.
2. turn over riveting self-locking nut according to claim 1, it is characterized in that: described big column (1) is that circular arc (8) transition connects with the connection of cone (2) and small column (3).
3. turn over riveting self-locking nut according to claim 1, it is characterized in that: described minor thread hole (5) is metric thread, inch screw thread, U.S. standard screw thread, whitworth thread or MJ screw thread.
4. turn over riveting self-locking nut described in claim 1, it is characterized in that: described cone (2) is that end is little, the closing in circular cone that root is large, conical surface gradient gets 3 ~ 5 °; The distance closed up between end cylindrical and minor thread hole (5) footpath, the end is 0.5 ~ 0.8mm.
5. turn over riveting self-locking nut according to claim 1, it is characterized in that: the distance ≮ 6mm between described big column (1) cylindrical and minor thread hole (5) footpath, the end.
6. turn over riveting self-locking nut according to claim 1, it is characterized in that: the wall thickness that described small column (3) is held is 1 ~ 1.5mm.
7. turn over riveting self-locking nut according to claim 1, it is characterized in that: the distance between described macropore (4) inwall and minor thread hole (5) footpath, the end is 0.5 ~ 1.5mm.
8. one kind for the processing method of turning over riveting self-locking nut described in the arbitrary claim of claim 1 ~ 7, it is characterized in that: the method adopts the direct die-forging forming blank of metal bar that plasticity is good, metal grain does not rupture after die-forging forming, crystal grain is the linear alignment along its length, then turns over riveting self-locking nut through machine flinishing and shaping the making of cold deformation; Described plasticity is good, metal grain does not rupture after die-forging forming, the metal bar of crystal grain along its length in the linear alignment is structural carbon steel or Alloy Constructional Steel.
9. processing method according to claim 8, is characterized in that: structural carbon steel comprises ML30 and ML35 bar; Alloy Constructional Steel comprises 30CrMnSiA, 40CrNiMoA and 40Cr bar.
10. processing method according to claim 8, it is characterized in that: described through machine flinishing with cold deformation is shaping refers to that the semi-finished product after machine flinishing after heat treatment adopt cold pressing technology, make to be positioned at the locking slot turned on riveting self-locking nut cone and produce larger contraction deformation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510302005.4A CN104963927A (en) | 2015-06-05 | 2015-06-05 | Flanging and riveting self-locking nut and machining method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510302005.4A CN104963927A (en) | 2015-06-05 | 2015-06-05 | Flanging and riveting self-locking nut and machining method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104963927A true CN104963927A (en) | 2015-10-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510302005.4A Pending CN104963927A (en) | 2015-06-05 | 2015-06-05 | Flanging and riveting self-locking nut and machining method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN104963927A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179431A (en) * | 2015-10-12 | 2015-12-23 | 贵州航天精工制造有限公司 | Riveting self-locking nut assembly and application method thereof |
| CN105179428A (en) * | 2015-10-16 | 2015-12-23 | 贵州航天精工制造有限公司 | Multi-functional two-lug high-locking nut and fabrication method thereof |
| CN110541880A (en) * | 2019-09-11 | 2019-12-06 | 上海纳特汽车标准件有限公司 | Rivet turning nut and combination of rivet turning nut and plate |
| CN113863569A (en) * | 2021-08-24 | 2021-12-31 | 宁波中鼎建筑设计有限公司 | Assembled building wall structure |
| CN115415754A (en) * | 2022-10-12 | 2022-12-02 | 中航动力株洲航空零部件制造有限公司 | Machining process for lock nut lathe |
| WO2023024357A1 (en) * | 2021-08-23 | 2023-03-02 | 航天精工股份有限公司 | New-type support plate self-locking nut having excellent locking performance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB846185A (en) * | 1957-07-30 | 1960-08-24 | Simmonds Sa | Swivel-action nut |
| US5020950A (en) * | 1990-03-06 | 1991-06-04 | Multifastener Corporation | Riveting fastener with improved torque resistance |
| CN201866056U (en) * | 2010-11-26 | 2011-06-15 | 青特集团有限公司 | Locking nut for automobile front axle hub bearings |
| CN202545518U (en) * | 2012-01-30 | 2012-11-21 | 湖北博士隆科技有限公司 | Automotive metal plate pressure riveting nut |
| CN103464976A (en) * | 2013-09-10 | 2013-12-25 | 崔严 | Nut machining method |
| CN204716710U (en) * | 2015-06-05 | 2015-10-21 | 贵州航天精工制造有限公司 | One turns over riveting self-locking nut |
-
2015
- 2015-06-05 CN CN201510302005.4A patent/CN104963927A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB846185A (en) * | 1957-07-30 | 1960-08-24 | Simmonds Sa | Swivel-action nut |
| US5020950A (en) * | 1990-03-06 | 1991-06-04 | Multifastener Corporation | Riveting fastener with improved torque resistance |
| CN201866056U (en) * | 2010-11-26 | 2011-06-15 | 青特集团有限公司 | Locking nut for automobile front axle hub bearings |
| CN202545518U (en) * | 2012-01-30 | 2012-11-21 | 湖北博士隆科技有限公司 | Automotive metal plate pressure riveting nut |
| CN103464976A (en) * | 2013-09-10 | 2013-12-25 | 崔严 | Nut machining method |
| CN204716710U (en) * | 2015-06-05 | 2015-10-21 | 贵州航天精工制造有限公司 | One turns over riveting self-locking nut |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179431A (en) * | 2015-10-12 | 2015-12-23 | 贵州航天精工制造有限公司 | Riveting self-locking nut assembly and application method thereof |
| CN105179428A (en) * | 2015-10-16 | 2015-12-23 | 贵州航天精工制造有限公司 | Multi-functional two-lug high-locking nut and fabrication method thereof |
| CN110541880A (en) * | 2019-09-11 | 2019-12-06 | 上海纳特汽车标准件有限公司 | Rivet turning nut and combination of rivet turning nut and plate |
| CN110541880B (en) * | 2019-09-11 | 2021-11-02 | 上海纳特汽车标准件有限公司 | Rivet turning nut and combination of rivet turning nut and plate |
| WO2023024357A1 (en) * | 2021-08-23 | 2023-03-02 | 航天精工股份有限公司 | New-type support plate self-locking nut having excellent locking performance |
| CN113863569A (en) * | 2021-08-24 | 2021-12-31 | 宁波中鼎建筑设计有限公司 | Assembled building wall structure |
| CN115415754A (en) * | 2022-10-12 | 2022-12-02 | 中航动力株洲航空零部件制造有限公司 | Machining process for lock nut lathe |
| CN115415754B (en) * | 2022-10-12 | 2024-04-26 | 湖南星途航空航天器制造有限公司 | Lathing process for lock nut |
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| C06 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20151007 |