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QB/T 1888-1993 English PDF (QBT1888-1993)

QB/T 1888-1993 English PDF (QBT1888-1993)

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QB/T 1888-1993: Spokes and nipples for bicycles

This standard specifies the product classification, technical requirements, test methods, inspection rules, markings, packaging, transportation, storage of spokes and nipples for bicycles. This standard is applicable to the spokes and nipples of different materials for bicycles, which are specified in QB 1714 and quot;Bike - Naming preparation methods and models and quot;.
QB/T 1888-1993
QB
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
QB/T 1888-93
Spokes and nipples for bicycles
ISSUED ON: JANUARY 06, 1994
IMPLEMENTED ON: AUGUST 01, 1994
Issued by: Ministry of Light Industry of PRC
Table of Contents
1 Subject content and scope of application ... 3
2 Normative references ... 3
3 Product classification ... 3
4 Technical requirements ... 6
5 Test method ... 8
6 Inspection rules ... 10
7 Marking, packaging, transportation, storage ... 12
Appendix A Special tensile rod (Supplementary) ... 14
Additional information ... 15
Spokes and nipples for bicycles
1 Subject content and scope of application
This standard specifies the product classification, technical requirements, test methods, inspection rules, markings, packaging, transportation, storage of spokes and nipples for bicycles (hereinafter referred to as "spokes and nipples"). This standard is applicable to the spokes and nipples of different materials for bicycles, which are specified in QB 1714 "Bike - Naming preparation methods and models".
2 Normative references
GB 238 Metallic materials-wire-reverse bend test
GB 2828 Sampling procedures and tables for lot-by-lot inspection by
attributes (Apply to inspection of successive lots or batches)
GB 2829 Sampling procedures and tables for periodic inspection by
attributes (Apply to inspection of stability for productive process)
GB 5929 Thickness testing method of the metal deposits and conversion
coatings for the light industrial products - Metallographic microscopic method GB 12743 Plant quarantine rules for producing areas of soybean seeds
QB/T 1217 Technical specification for bicycle electroplating
QB 1714 Bike - Naming preparation methods and models
3 Product classification
3.1 See Table 1 and Table 2 for types and codes.
measurement error due to the out-of-roundness of spoke).
5.9.1.3 Use hydrochloric acid to remove the zinc layer on the nipple (at the diameter a) (it is OK when there is no violent bubbling).
5.9.1.4 After wiping clean the corroded surface, use a micrometer to measure the diameter (b) at the same location.
Calculate the thickness of the zinc layer of the spoke:
Where:
δ - The thickness of the zinc layer, µm;
a - The diameter of spoke after plating, mm;
b - The diameter of spoke after removing plating, mm.
5.9.2 Where there is a dispute, it can be arbitrated in accordance with the metallurgical microscope method in GB 5929.
6 Inspection rules
6.1 Products must pass the inspection of the quality inspection department of the manufacturer AND be accompanied by a certificate, before they can leave the factory.
6.2 The unit product, at the time of sampling inspection, is a pair (that is, the spoke and the nipple form a pair).
6.3 Exit-factory inspection
Adopt GB 2828.
6.3.1 Adopt general inspection level I and sub-sampling plan.
6.3.2 Inspection items, unqualified classifications, acceptance quality levels are as shown in Table 11.
7 Marking, packaging, transportation, storage
7.1 Marking
The outer packaging shall have the following signs:
a. Manufacturer name;
b. Product trademark;
c. Product name;
d. Product marking;
e. Quantity;
f. Gross weight and net weight;
g. Date of manufacture;
h. Box size (length x width x height) or volume:
i. Standard code, serial number, name (it may not be marked, if it has been marked in the product manual);
j. Avoid getting wet;
k. Stacking height.
7.2 Packaging
7.2.1 The structure of the outer packaging box shall be firm and dry. The box shall be lined with moisture-proof paper OR take other moisture-proof
measures.
7.2.2 After the products are packed in the specified inner packaging, they shall be neatly arranged in the box AND must not be shaken.
7.2.3 The product packaging shall be accompanied by a certificate of conformity. 7.3 Transportation
The packaging box, which contains the product, shall be loaded, unloaded, transported, in accordance with the pictorial signs on packaging, storage, transportation. It shall be handled with care, without throwing. During transportation, it is not allowed to be exposed to the sun or rain; it is strictly forbidden to mix it with flammable products and active chemicals.

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