RR-F-191/4F
4.4.2.3.1 Measurements. Determine the thickness by taking half of the difference between the diameter of the aluminum-coated wire and the diameter of the wire after stripping the aluminum, or determined microscopically in accordance with ASTM B487. Use the mean of two measurements at right angles to each other when determining the diameter of the coated or the stripped wire, or use the mean of the coating thickness taken at right angles to each other when determined microscopically.
4.4.2.3.2 Magnetic. Determine thickness of aluminum coating magnetically in accordance with ASTM E376.
4.4.3 Barbed wire support arms. Clamp the base of the arm securely. Apply a vertical
250-lb load where the outer strand of barbed wire connects to the arm, permanent deflection of the arm is cause for rejection (see 3.5).
5. PREPARATION FOR DELIVERY (See RR-F-191/GEN).
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Ordering Data. Purchasers should select the preferred options permitted herein and include the following information in acquisition documents:
a. Title, number, and date of this specification. b. Item required (see 1.2).
c. Material for accessories if other than specified (see 3.1). d. Zinc or Zn-5Al-MM coating if other than specified (see 3.2).
e. Color coating material if other than specified and color required (see 3.3). f. Type of tension wire required (see 3.4.7).
g. When wire ties and clips are to be other than required (see 3.4.4).
h. When tension wire is to be other than 7 gage and gage required (see 3.4.7).
i. Zinc coating for steel tension wire if other than specified (see 3.4.7.1). j. Type of barbed wire required (see 3.4.9).
k. Type of barbed wire support arms required (see 3.5).
l. When miscellaneous accessories are not the manufacturer's option and the accessories specified (see 3.6).
6.2 Accessories. Consult manufacturers or suppliers when ordering accessories since some accessories are furnished with all chain-link fencing.
6.3 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where changes (additions, modifications, and corrections) from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue.
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