This standard specifies the basic requirements for the position tolerance, material and hardness, appearance and surface roughness, marking and packaging of 60°, 90° and 120° conical countersinks. This standard applies to 60°, 90° and 120° conical countersinks produced in accordance with GB/T1143 and GB/T4258. GB/T 4259-2004 Technical conditions for conical countersinks GB/T4259-2004 Standard download decompression password: www.bzxz.net

ICS 25. 100, 30
National Standard of the People's Republic of China
GB/T.4259—2004
Replaces GB142591984
Conical drill
Technical conditions
Countersinks-Technical requirements2004-02-10 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
2004-08-01 Implementation
From the date of implementation of the standard (14/112.1-19H1 new technical system 3. The standard has the following differences compared with G3123410:
Edition format GB/T1.2 0C℃
Drill material 8 changes\Mos core\:www.bzxz.net
Cancel the performance test one;
The surface roughness in the type size is included in this standard...·Mark compensation.
Remove the standard from China Machinery Industry Federation. 1 This standard is proposed by the National Standardization Technical Committee, and this standard starts from: The recipient and the selected one. This standard is mainly recognized by China, and the previous issuance of the standard replaced by this standard; GR/T 1259-1581.
GD/T4259—2004
1 Scope
Technical conditions for cone surface strontium drill
GR/T 4259—2004
This standard specifies the basic requirements for position tolerance, material and thickness, shape and surface roughness, cutting and packaging of 5120\ cones.
This standard is applicable to 612\ surface drill produced by B/T 143, B/T 258. 2 Normative references
The clauses in the following documents are incorporated into this standard through reference in this standard. For any referenced documents, all subsequent amendments (excluding the inclusion of errors) or revisions are not applicable to this standard. However, any research and development that reaches an agreement based on this standard shall not be considered as the latest version of these documents. The latest version of the reference is applicable to this standard G3/T1146090°120 Civil Dimensional Surface Hot Drill (GB/T1143-2534.1SO3293,1U75.IDT) GB/T42586390\120\ Straight Shank Dimensional Surface Diamond (GB/T4258-20C4.IS0) 3294:197T1T) 3: Position tolerance
The slicing tolerance of the dense station is 0. The material and hardness
4.1 It is made of WG>VinsCMV2 or other materials with equivalent performance. The connecting part is made of 43 or other materials with equivalent performance.
4.2 Hardness of the pin,
working part: TTRCTIRC
. Part or point: 40HRC--55HRC for basic part. 30HRL--25HRC for drilling part.5 Appearance and surface roughness
5.1 The surface of the pin shall not have defects such as cracks, scratches, and chipping that may affect its performance. 5.2 The surface area is: front and back, R.3, handle area, Ranm. 6 Marking and packaging 6.1 Marking 6. 1. 1 The product should be marked with:
Made in China
Self-produced high-speed steel code "HS",
6.1.2 The packaging box should be marked with:
The name of the manufacturer or the seller, the name of the manufacturer, the diameter, angle, standard line number, brand name or number!
GB/T 4259—2004
Number of pieces!
The first manufacturing bucket
The product should be rust-proofed before packaging. The packaging must be firm.
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