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6 材料
6.1 材料技术条件
材料牌号、化学成分、铁素体晶粒度和力学性能等材料技术条件，应符合附录A的规定。
6.2 适用的紧固件
细晶非调质钢线材适用的紧固件产品、规格和性能等级应符合表2的规定。
表2 适用的紧固件产品、规格和性能等级
材料牌号 | 螺纹公称直径 | 性能等级 | 适用的产品 |
MFT8 | 5～16 | 8.8F、08.8F | 螺栓、螺钉、螺柱和螺杆 |
MFT9 | 5～16 | 9.8F、09.8F | |
MFT10 | 5～16 | 10.9F、010.9F | 螺柱和螺杆 |
6.3 推荐的工艺
为保证冷加工成形的螺栓、螺钉、螺柱和螺杆的性能，应进行稳定化处理。推荐的细晶非调质钢热轧盘条加工紧固件的使用准则，见附录B。
7 机械和物理性能
在环境温度为10℃～35℃（夏比摆锤冲击试验为-20℃）的条件下，按第9章规定的试验方法进行试验时，紧固件产品应符合表3的规定。
第8章规定了各种型式尺寸紧固件可适用的试验方法。
注：即使紧固件的材料性能符合表2和表3的规定，但由于尺寸原因，某些型式的紧固件也会降低承载能力（见8.2和9.3）。
表3 螺栓、螺钉和螺柱的机械和物理性能
分项条号 | 机械和物理性能 | 性能等级 | |||
8.8F | 9.8F | 10.9F | |||
1 | 抗拉强度Rm/MPa | 公称a | 800 | 900 | 1000 |
min | 800 | 900 | 1040 | ||
2 | 规定非比例伸长0.2%的应力，RP0.2/MPa | 公称a | 640 | 720 | 900 |
min | 640 | 720 | 940 | ||
3 | 保证应力SPb/MPa | 公称 | 580 | 650 | 830 |
保证应力比SP,公称/RP0.2 min | 0.91 | 0.90 | 0.88 | ||
4 | 机械加工试件的断后伸长率A/% | min | 12 | 10 | 9 |
5 | 机械加工试件的断面收缩率Z/% | min | 52 | 48 | 48 |
6 | 头部坚固性 | 不得断裂 | |||
7 | 维氏硬度 HV F≥98N | min | 250 | 290 | 320 |
max | 320 | 360 | 380 | ||
8 | 布氏硬度 HBW F=30D2 | min | 238 | 276 | 304 |
max | 304 | 342 | 361 | ||
9 | 洛氏硬度 HRC | min | 22 | 28 | 32 |
max | 32 | 37 | 39 | ||
10 | 破坏扭矩MB/Nm | min | 见GB/T 3098.13 | ||
11 | 吸收能量KVc,d/J | min | 27 | ||
12 | 表面缺陷 | GB/T 5779.1e | |||
a 性能等级的标记制度仅要求规定公称值，见第5章。 b 表5和表7规定了保证载荷。 C 在-20℃试验温度下测定的数值。 d 适用于d=l6mm。 e 如用GB/T 5779.3 代替，应由供需双方协议。 | |||||
表4～表7规定了最小拉力载荷和保证载荷。
表4 最小拉力载荷——粗牙螺纹
螺纹规格a d | 公称应力截面积 AS,公称b/mm2 | 性能等级 | ||
8.8F | 9.8F | 10.9F | ||
最小拉力载荷，Fm,min（AS,公称×Rm,min）/N | ||||
M5 | 14.2 | 11350 | 12800 | 14800 |
M6 | 20.1 | 16100 | 18100 | 20900 |
M7 | 28.9 | 23100 | 26000 | 30100 |
M8 | 36.6 | 29200c | 32900 | 38100c |
M10 | 58 | 46400c | 52200 | 60300c |
M12 | 84.3 | 67400 | 75900 | 87700 |
M14 | 115 | 92000 | 104000 | 120000 |
M16 | 157 | 125000 | 141000 | 163000 |
a 在螺纹标记中不标记螺距者，应为粗牙螺距。 b AS,公称的计算见9.1.6.1。 C 用于热浸镀锌的6az螺纹紧固件，可按GB/T 5267.3附录A降低数值。 | ||||
表5 保证载荷——粗牙螺纹
螺纹规格a d | 公称应力截面积 AS,公称b/mm2 | 性能等级 | ||
8.8F | 9.8F | 10.9F | ||
最小拉力载荷，Fm,min（AS,公称×Rm,min）/N | ||||
M5 | 14.2 | 8230 | 9230 | 11800 |
M6 | 20.1 | 11600 | 13100 | 16700 |
M7 | 28.9 | 16800 | 18800 | 24000 |
M8 | 36.6 | 21200c | 23800 | 30400c |
M10 | 58 | 33700c | 37700 | 48100c |
M12 | 84.3 | 48900 | 54800 | 70000 |
M14 | 115 | 66700 | 74800 | 95500 |
M16 | 157 | 91000 | 102000 | 130000 |
a 在螺纹标记中不标记螺距者，应为粗牙螺距。 b AS,公称的计算见9.1.6.1。 c 用于热浸镀锌的6az螺纹紧固件，可按GB/T 5267.3附录A降低数值。 | ||||
表6 最小拉力载荷——细牙螺纹
螺纹规格 d×P | 公称应力截面积 AS,公称a/mm2 | 性能等级 | ||
8.8F | 9.8F | 10.9F | ||
最小拉力载荷，Fm,min（AS,公称×Rm,min）/N | ||||
M8×1 | 39.2 | 31360 | 35300 | 40800 |
M10×1 | 64.5 | 51600 | 58100 | 67100 |
M10×1.25 | 61.2 | 49000 | 55100 | 63600 |
M12×1.25 | 92.1 | 73700 | 82900 | 95800 |
M12×1.5 | 88.1 | 70500 | 79300 | 91600 |
M14×1.5 | 125 | 100000 | 112000 | 130000 |
M16×1.5 | 167 | 134000 | 150000 | 174000 |
a AS,公称的计算见9.1.6.1。 | ||||
表7 保证载荷一细牙螺纹
螺纹规格 d×P | 公称应力截面积 AS,公称a/mm2 | 性能等级 | ||
8.8F | 9.8F | 10.9F | ||
保证载荷，FP（AS,公称×SP）/N | ||||
M8×1 | 39.2 | 22700 | 25500 | 32500 |
M10×1 | 64.5 | 37400 | 41900 | 53500 |
M10×1.25 | 61.2 | 35500 | 39800 | 50800 |
M12×1.25 | 92.1 | 53400 | 59900 | 76400 |
M12×1.5 | 88.1 | 51100 | 57300 | 73100 |
M14×1.5 | 125 | 72500 | 81200 | 104000 |
M16×1.5 | 167 | 96900 | 109000 | 139000 |
a AS,公称的计算见9.1.6.1。 | ||||
Mechanical properties of fasteners - Stainless steel Bolts, screws and studs
Mechanical properties of fasteners-Stainless steel and nickel alloys bolts, screws, studs and nuts for high temperature applications
Mechanical properties of fasteners-Guidance for the selection of stainless steels and nickel alloys for fasteners
Mechanical Properties of Fasteners - Prevailing Torque Type Steel Nuts
Mechanical properties of fasteners-Set screws
Mechanical properties of fasteners-nuts with coarse thread
High-strength structural bolting assemblies for preloading - Part2: Suitability for preloading
Mechanical properties of fasteners - Stainless steel nuts
Mechanical properties of fasteners - Stainless steel set screws
Mechanical properties of fasteners - Stainless steel Bolts, screws and studs
Mechanical properties of fasteners-Bolts、screws and studs
Mechanical properties of fasteners Parts for bolted connections for use at temperatures from -200 ℃～+700 ℃
Spring washer technical conditions
Mechanical properties of fasteners-Blind rivets
Mechanical properties of fasteners. Wing nuts with specified proof torque
Mechanical properties of fasteners-Drilling screws with tapping screws thread
Mechanical properties of fasteners. Prevailing torque type steel hexagon nuts
Mechanical properties of fasteners-Nuts-Fine pitch thread
Mechanical propretles of fasteners tapping screws
Mechanical properties of fasteners-Bolts、screws and studs made of stainless-steel
Machanical properties of fasteners-Thread rolling screws
Mechanical properties of fasteners Bolts,scrows,studs and nuts made of non-ferrous metals
Specification for revit
Mechanical Properties of Fasteners 一 Tapping Screws
Fasteners - Mechanical properties of corrosion-resistant stainless steel fasteners - Part 7: Flat washers with specified grades and property classes
Heat treated tapping screws - Mechanical and physical properties
Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts with specified property classes
Mechanical properties of corrosion-resistant stainless steel fasteners - Nuts with specified grades and property classes bsi.
Mechanical properties of fasteners made of carbon steel and alloy steel – Part 3: Flat washers with specified property classes
Mechanical Properties of Fasteners - Prevailing Torque Type Steel Nuts
Mechanical properties of fasteners made of carbon steel and alloy steel. Part 1:Bolts,screws and studs with specified property classes. Coarse thread
Mechanical properties of fasteners made of carbon steel and alloy steel - Part 2: Nuts with specifed property classes - Coarse thread and fne pitch thread
Mechanical properties—Set screw and similar threaded fasteners with specified hardness classes
Heat-treated steel tapping screws - Mechanical properties
Mechanical properties of corrosion resistant stainless steel fasteners—Part 1:Nuts
Mechanical properties of corrosion resistant stainless steel fasteners— Part 3:Set screws and similar fasteners not under tensile stress
Mechanical properties of corrosion resistant stainless steel fasteners— Part 4:Tapping screws
Drilling screws with tapping screw thread— Mechanical and functional properties
Mechanical and performance requirements of case hardened and tempered metric thread rolling screws
Mechanical properties of fasteners - Part 6: Nuts with specified proof load values - Fine pitch thread
Torsional test and minimum torques for bolts and screws
Mechanical properties of fasteners—Bolts,screws,studs and nuts made of non-ferrous metals
Heat-treated steel tapping screws - Mechanical properties
Test methods of tightening torque for bolts
Maximum Drive Torque for Type TRS Tapping Screws
Torsional Strength Requirements for Tapping Screws
Nylon Insert Locknuts (Inch Series)
Aerospace series - Bolts, MJ threads, in heat resisting steel FE-PA2601 (A286) - Classification: 900 MPa (at ambient temperature)/650℃ - Technical specification
Non-preloaded structural bolting assemblies - Part 1: General requirements
High-strength structural bolting assemblies for preloading - Part 2: Suitability for preloading
Mechanical properties of fasteners - Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm
Mechanical properties of fasteners - Part 2: Nuts with specified proof load values - Coarse thread
Mechanical properties of fasteners - Part 6: Nuts with specified proof load values - Fine pitch thread
Mechanical properties of fasteners - Part 1: Bolts, screws and studs
Mechanical Properties of Fasteners - Bolts, Screws, Studs and Nuts
Suppliers(1)
Carbon Steel Bolts, Studs, and Threaded Rod 6000 PSI Tensile Strength
Carbon steels、alloy steels and stainless materials for bolts and nuts
Mechanical properties of fasteners made of carbon steel and alloy steel Part 2: Nuts with specified property classes - Coarse thread and fine pitch thread
Mechanical properties of fasteners made of carbon steel and alloy steel. Part 1:Bolts,screws and studs
Self-drilling screws for the building and construction industries Part 1: General requirements and mechanical properties
Thread Rolling Screws
Maximum Drive Torque for Type TRS Tapping Screws
Torsional Strength Requirements for Tapping Screws
