PREFERRED

BIFURCATED TERMINAL

The terminal is properly set, aligned and straight. Tines are straight. No exposed base metal. Flange is swaged sufficiently tight to prevent Z-axis movement, while allowing finger force twisting for adjustment. No damage to the PWB.

PREFERRED

ELLIPTICAL FUNNEL SWAGE

The flange is uniformly shaped and concentric to the hole or termination pad. Strain/Stress marks are minimum, no splits or cracks. Flange is swaged sufficiently tight to prevent Z-axis movement, while allowing finger force twisting for adjustment. No damage to the PWB.

PREFERRED

ROLL FLANGE SWAGE

The flange is uniformly rolled and concentric to the hole or termination pad. Strain/Stress marks are minimum, no splits or cracks. Flange is swaged sufficiently tight to prevent Z-axis movement, while allowing finger force twisting for adjustment. No damage to the PWB.

PREFERRED

TURRET TERMINAL

The terminal is properly set and straight. No exposed base metal. Flange is swaged sufficiently tight to prevent Z-axis movement, while allowing finger force twisting for adjustment. No damage to the PWB.

PREFERRED

V-FUNNEL FLANGE

The flange is uniformly swaged and concentric to the hole/pad, and is sufficiently tight to prevent Z-axis movement, while allowing finger force twisting for adjustment. Minimum stress marks, no splits or cracks. No damage to the PWB.

MANDATORY

ADJUSTABILITY

Terminals shall be swaged such that they can be rotated (twisted) under finger force.

NASA-STD-8739.3 [8.2.4]

MANDATORY

COMPONENT SIDE TERMINATION
ROLL SWAGE

Swage type terminals in non-PTH's, designed to have the terminal shoulder soldered to the printed wiring conductor, shall be secured to the PWB by a roll swage.

NASA-STD-8739.3 [8.2.2]

ACCEPTABLE

PLATED-THROUGH HOLE (PTH) TERM.
V-FUNNEL/ELLIPTICAL SWAGE

Terminals mounted in plated-through holes (PTH) shall be secured with a V-funnel or elliptical funnel swage. The elliptical funnel is preferred.

NASA-STD-8739.3 [8.2.4]

MANDATORY

PLATING

Terminals shall be copper, hot dipped, tin-lead coated or hot reflowed, electrodeposited tin-lead solder. Finish shall be smooth and shiny.

NASA-STD-8739.3 [9.1.12]

UNACCEPTABLE

PLATING DEFECTS

Flaking or peeling plating shall be grounds for rejection.

Best Workmanship Practice

MANDATORY

SOLDER SIDE TERMINATION
V-FUNNEL SWAGE

Designs calling for soldering of the swaged end of the terminal to the printed wiring conductor on a single-sided PWB shall be secured with a V-funnel swage.

NASA-STD-8739.3 [8.2.3]

UNACCEPTABLE

IMPROPER SWAGE USED

Designs calling for soldering of the swaged end of the terminal to the printed wiring conductor on a single-sided PWB shall be secured with a V-funnel swage.

NASA-STD-8739.3 [13.6.2.a.14]

ACCEPTABLE

SWAGE SETTING

The terminal shall be swaged sufficiently tight to prevent Z-axis movement, while allowing finger force twisting for adjustment. Swaging shall not damage the PWB or the termination pad.

NASA-STD-8739.3 [8.2.1.a]

ACCEPTABLE

SMOOTH IMPRESSION MARKS

Smooth impression marks (base metal not exposed) resulting from tool holding forces shall not be cause for rejection.

NASA-STD-8739.3 [7.2.3]

ACCEPTABLE

RADIAL ALIGNMENT
(BIFURCATED TERMINALS ONLY)

The terminal is slightly twisted out of radial alignment, but the alignment will not adversely affect component installation or strain relief.

Best Workmanship Practice

UNACCEPTABLE

IMPROPER ALIGNMENT

Bifurcated terminals shall be aligned to allow the proper termination of leads or conductors.

Best Workmanship Practice

ACCEPTABLE

RADIAL SPLITS/CRACKS

The rolled area or flange may have a maximum of 3 radial splits or cracks, which are separated by at least 90°, and/or which do not extend beyond the coiled or flared area.

NASA-STD-8739.3 [8.2.1.b]

UNACCEPTABLE

RADIAL SPLITS/CRACKS

The rolled area or flange shall not have more than 3 radial splits or cracks, which are separated by less than 90°, and/or which extend beyond the coiled or flared area.

NASA-STD-8739.3 [8.2.1.b], [13.6.2.a.14]

ACCEPTABLE

VERTICAL MISALIGNMENT

The terminal is slightly bent, but the top edge does not extend beyond the base, and alignment will not violate minimum electrical clearance.

Best Workmanship Practice

UNACCEPTABLE

CIRCUMFERENTIAL SPLITS/CRACKS

After swaging or flaring, the rolled area or flange shall be free of circumferential splits or cracks.

NASA-STD-8739.3 [8.2.1.b], [13.6.2.a.14]

UNACCEPTABLE

IMPROPER SWAGE USED

Roll swages shall not be used on plated-through holes.

NASA-STD-8739.3 [8.2.2]

UNACCEPTABLE

INCOMPLETE SWAGE

The flange shall be swaged sufficiently tight to prevent movement in the Z-axis.

Best Workmanship Practice

UNACCEPTABLE

INTERFACIAL CONNECTIONS

Terminals shall not be used as interfacial connections in non-plated through holes.

NASA-STD-8739.3 [8.2.1.a], [13.6.2.a.14]

UNACCEPTABLE

MODIFICATIONS

Terminals shall not be modified to accommodate improper conductor sizes.

NASA-STD-8739.3 [7.3.2], [13.6.2.a.19]

UNACCEPTABLE

NONCONCENTRIC SWAGE

The swage shall be set approximately concentric to the hole and/or termination pad.

Best Workmanship Practice

UNACCEPTABLE

PWB DAMAGE

The terminal has been swaged to the point that the substrate has been fractured and glass fiber is exposed.

NASA-STD-8739.3 [8.2.1.a]

UNACCEPTABLE

TERMINAL DAMAGE

Terminals exhibitng physical damage (i.e.: nicks, gouging, bent/missing tines, reduced cross-section, etc.) shall be rejected.

Best Workmanship Practice