螺栓、螺母、墊圈的性能等級和推薦材料按表1的規定。
表1
類 别 | 性能等級 | 推薦材料 | 材料标準号 |
螺栓 | 10.9S | 20MnTiB | GB 3077 |
螺母 | 10H | 45、35 | GB 699 |
15MnVB | GB 3077 | ||
墊圈 | HRC 35~45 | 45、35 | GB 699 |
試件機械性能：制造者應對螺栓原材料取樣進行拉力試驗，其結果應符合表2的規定。根據用戶要求可進行材料的常溫沖擊韌性試驗，其結果應符合表２的規定。
表2
抗拉強度σb | 屈服強度σ0.2 | 伸長率δ5 | 收縮率ψ | 沖擊值αk | |
max | min | min | min | min | min |
1240 | 1040 | 940 | 10 | 42 | 59 |
實物機械性能：對螺栓實物進行楔負載試驗時，當拉力載荷在表3規定的範圍内，斷裂應發生在螺紋部分或螺紋與螺杆交接處。
表3
螺紋規格 d | 公稱應力截面積 As | 性能等級 10.9S | |
拉力載荷（As×σb），N | |||
min | max | ||
M16 | 157 | 163000 | 195000 |
M20 | 245 | 255000 | 304000 |
M22 | 303 | 315000 | 376000 |
M24 | 353 | 367000 | 438000 |
硬度：當螺栓Ｌ/ｄ≤３時，如不能做楔負載試驗，應進行芯部硬度試驗。芯部硬度值應符合表４的規定。
表4
性能等級 | 硬 度 | |||
洛氏 HRC | 維氏 HV30 | |||
min | max | min | max | |
10.9S | 33 | 39 | 312 | 367 |
螺栓的脫碳層按GB 3098.1表3的有關規定。
表5 螺母的保證載荷
螺紋規格 D | 公稱應力截面積As mm2 | 性能等級 10H | |
保證應力 Sp | 保證載荷（As×Sp） | ||
M16 | 157 | 1040 | 183000 |
M20 | 245 | 1040 | 255000 |
M22 | 303 | 1040 | 315000 |
M24 | 353 | 1040 | 367000 |
表6 螺母硬度
性能等級 | 硬度 | |||
洛氏 HRB | 洛氏 HRC | 維氏HV30 | ||
min | max | min | max | |
10.9S | 98 | 28 | 222 | 274 |
墊圈的硬度應為HV30329~436（HRC 35~45）。
表7 連接副緊固軸力
螺紋規格 | M16 | M20 | M22 | M24 | |
每批緊固軸力的 平均值（KN） | 公稱 | 109 | 170 | 211 | 245 |
min | 99 | 154 | 191 | 222 | |
max | 120 | 186 | 231 | 270 | |
緊固軸力标準偏差σ≤ | 1.01 | 1.57 | 1.95 | 2.27 | |
當L小于表8數值時，可不進行緊固軸力試驗。
表8
螺紋規格 | M16 | M20 | M22 | M24 |
L | 60 | 60 | 65 | 70 |
螺紋的基本尺寸按GB 196粗牙普通螺紋的規定。螺栓螺紋公差帶按GB 197的6ｇ，螺母螺紋公差帶按GB 197的6Ｈ。
螺紋牙側表面粗糙度Ｒa的最大值為12.5μｍ。
螺栓、螺母的表面缺陷分别按GB 5779.1、GB5779.2的規定。
墊圈表面不允許有裂紋、毛刺、浮鏽和影響使用的凹痕、劃傷。
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