The balls covered in this specification are intended for use in bearings, bearing applications, check valves and other components utilizing balk. This specification covers the acquisition requirements for specification sheets /1 through /6.

Acquisition documents should specify the following:

a. Title, number and date of this specification.

b. Applicable specification sheet dash number(s) (see 2.1).

c. Non-standard balls when required (see 3.1.1). When non-standard balls are ordered, cite:

(1) Composition number required (see 3.3.1).

(2) AFBMA Grade required.

(3) Diameter required.

d. First article when required (see 3.2)

e. Inspection conditions if other than as specified (see 4.3).

f. Sampling when required (see 4.6. I).

g. Rejection criteria for visual and dimensional inspections (for Compositions 1 thru 12 balls) (see 4.7.1.1 and 6.3).

h. Tests when required (see 4.9).

i. Traceability records when required (for Composition 13 balls only) (see 4. 10).

j. Material records when required (for Composition 13 balls only) (see 4.11 and 6.2.1.1).

k. Eddy current inspection records when required (for Composition 13 balls only) (see 4.12 and 6.2.1.1).

l. Ultrasonic inspection records when required (for Composition 13 material only) (see 4.13 and 6.2.1.1).

m. Quantity required (see 5.2).

n. Applicable levels of preservation and packing (see 5.1 and 5.2).

o. Special marking if required (see 5.3).

Acquisition documents should specify that the Composition 13 material, eddy current and ultrasonic inspection records (see 4.11, 4.12 and 4.13) are to be maintained for fifteen years from the date of contract or purchase order completion. Acquisition documents should also specify that the records, when requested by the Government (see 6.2.2), are to be available for delivery within three working days.

When this specification is used in an acquisition and data are required to be delivered, the data requirements identified below shall be developed as specified by an approved Data Item Description (DD Form 1664) and delivered in accordance with the approved Contract Data Requirements list (CDRL), incorporated into the contract. When the provisions of DOD FAR Supplement, Part 27, Sub-Part 27.475-1 (DD Form 1423) are invoked and the DD Form 1423 is not used, the data specified below shall be delivered by the contractor in accordance with the contract or purchase order requirements. Deliverable data required by this specification are cited in the following paragraphs.

Paragraph no. Data requirement title Applicable DID no. 4.6.6, 4.7.4.2, and 4.9.1 Certificate of conformance 4.11 Material identification record 4.12 Eddy current inspection record 4.13 Ultrasonic inspection record

(Data item descriptions related to this specification, and identified in Section 6, will be approved and listed as such in DOD 5010.12-L., AMSDL. Copies of data item descriptions required by the contractors in connection with specific acquisition functions should be obtained from the Naval Publications and Forms Center or as directed by the contracting officer.)

When a first article inspection is required, the item shall be tested as specified in 3.2, 4.4, 4.8 and 4.9. The contracting officer should include specific instructions in acquisition documents regarding arrangements for examinations and test approval of the documents' first article.

One example of rejection criteria for visual and dimensional examinations is shown in Table 'X. Corresponding values and provisions for rejection are provided in MIL-STD-105. TABLE X. Rejection criteria.

Inspection Inspection level Rejection level ------------------------------------------------------------------------------ Visual Major Defects II 1.0 Minor Defects II 6.5 Dimensional Examination: Diameter tolerance per ball S-1 2.5 Ball diameter variation S-1 2.5 Measurement of deviation from S-1 2.5 spherical form Tolerances by grade for lots of balls S-1 2.5 Specific diameter marking S-1 2.5

When used in connection with this specification, the following terms shall be defined herein.

The grade designation indicates the allowable out-of-roundness expressed in micrometers (μm).

The size which is used for the purpose of general identification, e.g., 0.3, 0.4, etc.

The size ordered which is the basis to which the basic diameter tolerances apply. The basic diameter is specified in millimeters (mm) , decimal form.

The diameter marked on the unit container and expressed in the grade standard marking increment nearest to the average diameter of the balls in that container.

Out-of-roundness is defined by the following characteristics and each characteristic is measured independently of the other: Diameter tolerance per ball is the difference between the largest diameter and the smallest diameter measured on the same ball.

The greatest radial distance in any radial plane between a sphere circumscribed around the ball surface and any point on the bail surface.

The maximum allowable deviation from the specified basic diameter for the indicated grade.

A container identified as containing balls from the same manufacturing lot of the same composition, grade and basic diameter, and within the allowable diameter variation per unit container for the specified grade.

The standard unit steps to express the specific diameter (see 4.8.5).

The thickness measured radially from the surface of the hardened case to a point where carbon content or hardness becomes the same as the ball core.

A treatment for corrosion resistant steel to eliminate corrodible surface impurities and provide a protective film.

The difference between the lot mean diameter and the sum of the nominal diameter and the ball gage.

An acronym derived from "vacuum induction melt - vacuum arc remelt."

Asterisks are not used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes.