螺钉的头

He slowly reaches into his pocket and reveal s a quarter. He inserts the quarter into the slotted head of the bleacher bolt and loosens it.

他把手慢慢地伸进裤兜里拿出了一个二角五分硬币，将硬币插入那个看台螺钉的槽头，开始旋松它。

Side view of fillister head slotted screw with adjustable thread length.

螺纹长度可调整的槽头螺钉的侧面图。

Top view of fillister head screw.

槽头螺钉的俯视图。

What is the bearing surface of a hex head cap screw?

六角头螺钉的支承面叫什么？

METHODS: From June 2007 to March 2009, 8 patients with terrible triad of the elbow were treated. The fracture of the radial head was classified according to the system of Mason, with typeⅠ in 1 patients, type Ⅱ in 6 and type Ⅲ in 1; fracture of the coronoid process was classified according to the system of Regan and Morrey, with type Ⅰin 2 patients, type Ⅱ in 5, and type Ⅲ in 1. The hollow lag screws and Herbert screws were used to fixe coronoid process and radial head fractures, and repair Annular ligament. Lateral collateral ligament was repaired in 1 case. All injured extremities were treated with a posterior plaster splint with the elbow joint held in 90° of flexion and the forearm in neutral rotation for 2-3 weeks followed by elbow rehabilitation training.

于2007-06/2009-03共收治肘关节恐怖三联征患者8例，其中尺骨冠突骨折按 Regan-Morrey法分类：Ⅰ型2例，Ⅱ型5例，Ⅲ型1例；桡骨头骨折按Mason法分类：Ⅰ型1例，Ⅱ型6例，Ⅲ型1例。8例患者均采取了内固定治疗，采用中空拉力螺钉或Herbert螺钉固定冠突和桡骨头骨折，修补环状韧带，1例缝合修复肘外侧副韧带，术后屈肘90°旋前中立位，以塑形良好的高分子管型石膏固定两三周后开始屈伸和旋转康复训练。

The screw entry point was located at the tip of transverse process. The average inclination angle should be 10°-20° headward and 30°-40° toward neutral line respectively. The screw was inserted and entered into the vertebral body along the external cortex of pedicle. The integrity of cortical bone around screws, the distance to segmental blood vessels and the penetration of cortex were observed after operation to evaluate the accuracy and safety of screw placement. Among 160 thoracic pedicle screws that were implanted in 34 cases, 148 screws (92.5%) were accurately inserted inside the costotransverse unit, and 12 screws (7.5%) were misplaced according to the image of X-ray and CT thin-slice scan.

应用椎弓根外内固定技术2004/2007年在中山大学附属第三医院骨科治疗34例患者，固定前采用CT加密扫描测量进钉点、进钉点至椎体前缘的深度、进钉角度和直径，固定中椎弓根钉入点为横突尖，进钉方向为平均向头侧倾斜10°~ 20°、与中线成角30°~40°，顺椎弓根外侧皮质进入椎体，固定后CT加密扫描观察螺钉周围的皮质骨是否完整、是否靠近节段血管、是否穿透皮质骨，评价置入钉的准确性和安全性。34例患者共置入160枚胸椎椎弓根螺钉，固定后CT加密扫描和X射线片观察到148枚(92.5%)螺钉置入准确，12枚(7.5%)螺钉发生错置。

The real-world joints in the aircraft structure usually consist of multi-row fasteners. This thesis builds the 3D FE contact analysis model of a typical aircraft joint with three-row countersunk screws, and studies pin-load distribution and stress characteristics under constant and varied cross-section thicknesses as well as with and without pre-tighten screw conditions for the joint. Many applied pin-load numerical distribution laws for different conditions in the joint are recognized.

本文对典型的多排沉头螺钉接头建立了三维有限元接触分析模型，对螺钉的钉载分布在截面等厚度和变厚度、无预紧力和加预紧力多种情况下进行了数值计算分析，给出了诸多实用化钉载分布规律。

From 2004 to 2007, 34 cases were treated with extrapedicular screw fixation in Department of Orthopaedics, Third Affiliated Hospital of Sun Yat-sen University. The screw entry point, angle, depth and diameter were measured and defined on the thoracic vertebrae pedicle by CT thin-slice scan in standard prone for all cases before operation. The screw entry point was located at the tip of transverse process. The average inclination angle should be 10°-20° headward and 30°-40° toward neutral line respectively. The screw was inserted and entered into the vertebral body along the external cortex of pedicle. The integrity of cortical bone around screws, the distance to segmental blood vessels and the penetration of cortex were observed after operation to evaluate the accuracy and safety of screw placement.

应用椎弓根外内固定技术2004/2007年在中山大学附属第三医院骨科治疗34例患者，固定前采用CT加密扫描测量进钉点、进钉点至椎体前缘的深度、进钉角度和直径，固定中椎弓根钉入点为横突尖，进钉方向为平均向头侧倾斜10°~20°、与中线成角30°~40°，顺椎弓根外侧皮质进入椎体，固定后CT加密扫描观察螺钉周围的皮质骨是否完整、是否靠近节段血管、是否穿透皮质骨，评价置入钉的准确性和安全性。34例患者共置入160枚胸椎椎弓根螺钉，固定后CT加密扫描和X射线片观察到148枚(92.5%)螺钉置入准确，12枚(7.5%)螺钉发生错置。

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We want to buy Socket Screws, Hex Hd Lag Screws, Hex Bolts and Nuts, Hex Hd Cap Screws, Miscellaneous ashers, Flat Washers, Taper Washers, Circlips, E-Clips, Special Parts, Nuts and Bolts1220. Psquare Partners

我们要采购凹头螺钉、六角形的Hd方头螺钉、六角形的螺栓和帽，六角形的Hd有头螺钉，混杂灰粉，平的洗衣机，逐渐变得尖细洗衣机，弹性挡圈， E箝器，特别零件

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐