Centalic PQ75-B-4GG Test Probe, Needle Tip, 75mil

The Centalic PQ75-B-4GG is a spring-loaded in-circuit test probe for fixtures laid out on 1.91 mm (75 mil) centres. It runs in an RQ75 receptacle pressed into the probe plate, so a worn probe is pulled and replaced by hand without touching the wiring.

The 75 mil (1.91 mm) size is the usual compromise in a bed-of-nails fixture: a sturdier barrel and higher contact reliability than 50 mil (1.27 mm) probes, in a pitch most test-point maps can accommodate. The B head is a needle (spear) point on a 0.64 mm plunger, concentrating all the spring load on one point so it penetrates no-clean residue on small pads and vias. At 4 oz (112 gf) the spring is the lightest of the three PQ75 options.

• Needle (spear) tip; plunger diameter 0.64 mm, barrel diameter 1.02 mm
• Recommended minimum centre spacing 1.91 mm (75 mil); mounting hole Ø1.35 mm
• Rated stroke 4.30 mm, full stroke 6.35 mm
• Spring force 112 gf (4 oz)
• Current rating 3 A continuous; contact resistance 40 mΩ
• Receptacle brass and barrel bronze, both gold plated; plunger BeCu; spring music wire, gold plated
• Used with RQ75 series receptacles