NOT FOR NEW DESIGN AS OF 2005-09.2005년 09월 이후 신규 설계 적용 금지 Dept/Issued by
KOR A104
Page
Engine team
Kyoung-boum Hwang
Issue
0
Established
2003.06.Hoe-kuen Kim1(2)
The Korean language version is the original and thereference in case of dispute.
내용에 대한 논쟁 발생시 한글본을 기준으로 삼는다.
Position of tap holes and drill holes, and tolerances for distancesbetween hole centers (For metal sheet)
Product, Volvo CE Korea LTD.
Purpose
The purpose of this standard is to make indications simple and standardized on drawings through establishmentof standard of the tolerances between hole centers and nominal diameters for the positions of tap and drill holes.
Contents
1.2.3.
Scope
TolerancesPosition
1. Scope
This standard specifies positions of tap holes of nominal diameters 3~48mm, drill holes of diameter 3.5~55.5mm,and the tolerances for distances between hole centers. This standard, however, is not applied to the followingcases.
(1) Reamer holes
(2) When technical grounds exist.
2. Tolerances
(1) Tolerances for center distances: As per table 1.
Table 1.
Unit: mm
Diameter (d) orTap and drill d ≤ 7 7 < d ≤ 1212 < d ≤ 2020 < d ≤ 3030 < d ≤ 45 d > 45
Tolerances
Tap Diameter ±0.12 ±0.25±0.5±0.5 ±0.75±1.0
Upper Class ±0.12±0.2 ±0.25 ±0.25±0.5 ±0.75
Drill HoleAverage Class
±0.12 ±0.25±0.5±0.5 ±0.75±1.0
Lower Class ±0.25 ±0.45±1.0±1.5±2.0±2.5
Note: Tolerances shall be applied to parts with curved face fabrication, drawing fabrication and weldingfabrication, in the case of metal sheets.
KOR A104
PageVolvo CE Korea Standard
NOT FOR NEW DESIGN AS OF 2005-09.Issue202005년 09월 이후 신규 설계 적용 금지 (2) Tolerances of dimension at end faces: As per table 2.
Table 2.
Dimension (D)at end face D ≤ 6363 < D ≤ 250250 < D ≤ 1000 D > 1000
Tolerances
Cutting Fabrication, Mold ForgingMetal Sheet, Weld Parts
±1.0
Shall follow Standard A 102 (Average±1.5
dimension tolerances for metal Sheets,
±2.0Weldings) ±3.4
(3) Indication on Drawings
① Tap Holes: Not indicated on drawings.
② Drill Holes (Upper class): Shall be indicated on drawings.
③ Drill Holes (For general use, metal sheet): Not indicated on drawings.
3. Position
Holes shall be located where bites are not damaged by side walls, ribs, welding legs, etc., as in Figure 1 andtable 3.
Figure 1.
Table 3. Unit: mm
ClassificationDimension (D)
ASide Wall of Castings, ForgingsD ≥ 3BRib of Matal SheetD ≥ 8
L ≤8D≥ 5
Leg Length of
CL8 < L ≤ 14 D ≥ 5.5
Fillet Welding
L > 14D ≥ 8Reference: 1. Example of metal sheet fabrication is indicated below.
From table 1, A: ±0.45
B: ±0.25 C: ±0.45 D: ±1.0 E: ±0.45
Dimension “E” is common center distance for Ø10 drill and Ø20 drill, and tolerance follows that of smallerdiameter.
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