GB/T 4251-2008Machine reamers with carbide tips (English PDF)
硬质合金机用铰刀
This is a limited preview
Buy now to download the full PDF (15 pages)
Need quotation for your management?
Get a formal quotation for GB/T 4251-2008 in 30 minutes.
Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 4, 2008
Implementation date
April 1, 2009
Scope
GB/T 4251-2008 is the English-translated version of 硬质合金机用铰刀.
GB/T 4251-2008 is the Chinese standard "Machine reamers with carbide tips". Its scope clause reads: This standard specifies the carbide straight shank, Morse taper shank machine reamers types and dimensions, position tolerances, material and hardness, and surface appearance Roughness, signs and packaging the basic requirements.
This standard applies to a diameter greater than 5.3mm to 20mm carbide straight shank machine reamers and to a diameter larger than 7.5mm 40mm carbide taper shank machine reamers. Its clauses include tolerance; type and size.
Found what you need?
Document preview — GB/T 4251-2008
National Standard of the People's Republic of China
- ICS
- 25.100.30
- Classification
- J 41
- Replacing
- GB/T 4252-2004
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Tolerance
- 4 type and size
1 Scope
This standard specifies the carbide straight shank, Morse taper shank machine reamers types and dimensions, position tolerances, material and hardness, and surface appearance
Roughness, signs and packaging the basic requirements.
This standard applies to a diameter greater than 5.3mm to 20mm carbide straight shank machine reamers and to a diameter larger than 7.5mm
40mm carbide taper shank machine reamers.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 1443 from machine tools and tool handles with clip cone (GB/T 1443-1996, eqv ISO 296.1991)
GB/T 2075 Classification and use of cutting large groups and groups of application of hard cutting materials classification code (GB/T 2075-
2007, ISO 513.2004, IDT)
GB/T 4246 reamer special tolerances (GB/T 4246-2004, ISO 522. 1975, IDT)
3 Tolerance
3.1 cutting portion
Reamer diameter tolerance referring to GB/T 4246 design, the tolerance position according to the workpiece, cutting conditions and other circumstances may be appropriate to move on.
Appendix A gives the processing H7, H8, H9 tolerance precision reamer diameter hole.
3.2 shank
3.3 length
Reamer length tolerance according to Table 1.
Table 1 length tolerance in millimeters
To more than tolerance
6 30 ± 1.0
30 120 ± 1.5
120 315 ± 2.0
315 1000 ± 3.0
4 type and size
4.1
straight shank machine reamer of the type according to FIG. 1, give priority to the size of the Table 2, the diameter of the segment's size Table 3. Also needed teeth
It can be made into a spiral or helical teeth.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of GB/T 4251
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 4251-2008 | Machine reamers with carbide tips | current edition | Current |
| GB/T 4252-2004 | Machine reamers with carbide tips | previous edition | Superseded |
This page sells the current edition, GB/T 4251-2008. Earlier editions are listed for reference only.
How to Download GB/T 4251-2008
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
GB/T 10003-2026 — Biaxially oriented polypropylene (BOPP) film
GB/T 10004-2026 — Plastic/Plastic laminated films and pouches for packaging
GB/T 10007-2026 — Rigid cellular plastics - Determination of shear properties
Secure payment via Stripe
Payments accepted
GB/T 4251-2008
$135.00