BS EN 3709:2006 pdf free.Wrenches and sockets,bi-hexagonal — Technical specification.
BS EN 3709 This standard specifies the requirements to be complied with by wrenches and double-hex sockets intendedfor aerospace products.
The following referenced documents are indispensable for the application of this document.For datedreferences,only the edition cited applies. For undated references,the latest edition of the referenceddocument (including any amendments) applies.
ISO 1174(all parts)，Assembly tools for screws and nuts — Driving squares.
ISO 4095,Aerospace — Bihexagonal drives — Wrenching configuration —Metric series.
EN 9133，Aerospace series — Quality management systems — Qualification procedure for aerospacestandard parts.
For the purposes of this standard, the following terms and definitions apply.
lot a lot is composed of wrenches or sockets of the same type, originating from the same material defined by thesame standard.
The materials shall meet the required properties specified in the product standard.
The wrenches and sockets shall be free from pits, deposits,forging burrs, cracks,splits, flashes and otherdefects likely to modify their properties and endurance or to injure users.
The wrench handle shall allow an easy handling and its shape shall permit a correct guiding of the box end.The wrenches and the outer surface of the sockets shall have a polished，brushed or satin-finishedappearance with a uniform bright or dull finish.
Surface coating The surface treatment shall be as specified in the product standard.
The tooth quality shall allow an optimum efficiency of the bearing faces. The whole tooth (top, flank andbearing faces) shall be free from burrs and high metal.
Mechanical properties The integrity and endurance of various types of wrenches are tried by torsional tests whose conditions aredefined in Clause 5.
On completion of integrity and endurance tests, the wrenches and sockets shall not show the deteriorationsand distortions defined below:
— The tooth shall not be rounded and shall comply with, the requirements specified in 4.2.3;—The wrench or the socket shall be free from crack;
— The general surface condition shall comply with the requirements of 4.2.1;
— The distortion of the socket and wrench outer diameter shall not exceed 0,05 mm;-The permanent distortion on the wrench handle shall not exceed 5;
— ARockwell hardness test shall show values complying with the values specified in the product standard.BS EN 3709 pdf download.