MIL-DTL-15659J
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein
and in accordance with the applicable specification sheet. In the event of any conflict between
the requirements of this specification and the specification sheet, the latter shall govern.
3.2 Material.
3.2.1 Class 1 material. The Class 1 lug terminals shall be fabricated of electrolytic copper
strip or sheet, alloy C11000, temper O60 in accordance with ASTM B 152/B 152M.
3.2.2 Class 2 material. The Class 2 lug terminals shall be fabricated of electrolytic
copper tubing, alloy C11000, temper O60 in accordance with ASTM B 188.
3.2.3 Class 3 material. The Class 3 lug terminals shall be fabricated of phosphor bronze strip
(1.3 percent tin), alloy C50500, with a minimum temper of H02 in accordance with ASTM B 508.
As an alternative material, copper strip, alloy C42500, with a minimum temper of H02, in accordance
with ASTM B 591 may be used.
3.3 Design and fabrication. All lug terminals shall be designed for attachment to their
appropriate conductor size as shown on the applicable specification sheets (see 6.2).
3.3.1 Dimensions. Dimensions and tolerances shall be in accordance with the applicable
specification sheet.
3.3.2 Finish. Lug terminals shall be tinned over their entire surface by electrodepositing
process in accordance with ASTM B 545.
3.3.2.1 Thickness of plating. The minimum thickness of electrodeposited tin plating
shall be 0.0005 inch.
3.3.3 Tooth construction for locking type lug terminals. The number of teeth, length of teeth,
and the free height (thickness of the lug over the teeth) shall be optional for the manufacturer. The
teeth shall be uniform in number and symmetrical with respect to the size, shape, and angle of the
twist or of the bent edges.
3.4 Performance.
3.4.1 Solderability. The lug terminal electrodeposited finish shall be considered solderable
when 95 percent of the total length of the fillet between the standard wrap wire and the terminal are
tangent to the surface of the terminal free of pinholes and voids. There shall not be a ragged or
interrupted line at the point of tangency between the fillet and terminal (see 4.4.1).
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