This standard specifies the types, dimensions and tolerances of straight shank reamer and Morse taper shank reamer. This standard lists two tables for each type of reamer: - preferred dimensions; - dimensions divided by diameter range. This standard only recommends metric dimensions, and will only recommend metric dimensions for this type of reamer in the future. Unless otherwise specified, this type of reamer is made right-hand cutting. GB/T 4256-2004 Straight shank and Morse taper shank reamer GB/T4256-2004 standard download decompression password: www.bzxz.net

ICS 25,. 100. 30
National Standard of the People's Republic of China
GB/T4256—2004
Replace GB/T2561984.GB/11411934
Core drills with parallel shanks and with Murse: taper shanks(1S 7079:198],M01))
2004-02-10 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
2004-08-01 Implementation
Wood standard revised and adopted 157:79, 12813 straight orange and wood handle drilling English version) This standard has the following effective technical differences and editorial corrections compared with 15707%:19F1: GA/T 4256--2CG4
The non-referenced document GB/T 4256--2CG4 is replaced by GB/T 4435 machine tools and 1 tooling.一 Use the symbol " " to represent some small points, "this standard" to replace "international standard"; except for those that do not conform to the international standard (H112CG, this standard will replace B/T425-1981 and H/411984 from now on, such as the following changes: G/T1=2561981 and GB114128. Size: The size range of G3/T4256-934 and GB/1141-1184 is the same as the size range of GB/T4256-934 and GB/1141-1184, the difference is that the diameter of the point is different: GT/T42 —19M1 and G/T:11—19H1 in TS07079. Adjusted to Table 1. Table 2 is preferred. Table 2 is divided into sections and the standard for drilling is cancelled. Example:
Local state \ standard \|tt|| Added, "Specification as reference document \;
Cross-add "pre-processing expansion station"
Wood standard penalty proposed by the Joint Machinery Industry Corporation: This standard is under the jurisdiction of the National Technical Committee for Standardization, and the drafting unit of this standard is: Chengdu Import and Export Co., Ltd.: This standard! The main drafter is Huang Huaxin.
The standard represents the market situation of the standard: G3 3I41 1$7H,GB/T 1111-:93.1T 226194
1 Scope
Straight shank and taper shank reamer
This standard specifies the types, dimensions and tolerances of straight shank reamer and taper shank reamer. The standard specifies two dimensions for each type of reamer: the first dimension and the second dimension. The dimensions are divided into sections according to the diameter.
This standard only recommends metric dimensions, but only the metric dimensions are used in the following sections. Unless otherwise specified, this reamer is made of right-cutting, 2 Normative references
CB/T 4256--2004
The following documents have become the revisions of this standard through the use of this standard. For any dated reference, the subsequent amendments (including errors) are not applicable to this standard. However, the latest revision of this document can be used according to the agreement reached in this standard. For undated references, their updated versions are applicable to this standard. / and use/
3 Type and size
3.1 Drill length tolerance
One diameter is not included in the total length! And cutting The maximum limit value of the production is equal to the length specified in the two adjacent upper and lower diameter ranges. For example, when the diameter is 15mm, the nominal value of the cutting length is 114mm, which can be specified between 108t and 130m: the nominal position of the total length is 169 yuanm, and the ratio is between: 50mm and 73mm. 3.2 Reamer diameter tolerance
The diameter tolerance of the reamer is hs, measured near the tip of the reamer. 3.3 Straight shank reamer
Point expansion my type and size function 1 and table: Table 2, circumference 1
GB/T 4256—2C04
Baixian modified field
Mo Min cone reamer
Table 1 Preferred dimensions
12, 50
12, TE
Table 2 Dimensions of segments by diameter
Medium in mm
Medium in m
Bottom length
True group hole section type and dimensions Figure 2 and Table 3. Table 4. Steam handle size and % difference connection T1113 provisions 2.85
-F, r5
25, 74
Table 3 Preferred dimensions
29, 70
Mo Gui Neng Ya
(:B/T 4256—2004bzxZ.net
of the certificate is meter
GB/T4256—2004
Pre-processing reamer
Size divided by diameter range
Light pressure
Armored tree number
According to the same processing allowance, production and sales diameter is calculated according to the table
25, 00
23, 00
Unit: meter
Compared to the bottom of the long crossing
Armored number
The middle welcome is the technique
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