Sealed aviation connectors
Circular screw-lock connectors for outdoor lighting, control cabinets, marine and vehicle harnesses. Six shell sizes share one coupling system, so the shell diameter and the contact count decide the part.
Six shell sizes, one coupling system
SP13, SP16, SP17, SP20, SP21 and SP28 run from a 13 mm to a 28 mm shell. Each size takes its own set of contact counts — up to 9 on SP13, SP16 and SP17, up to 12 on SP21, up to 14 on SP20 and up to 26 on SP28 — and every size locks with the same bayonet-free screw collar, so a harness can change shell diameter without changing the way it couples.
Mounting decides the part number
The same shell is sold as a rear-nut panel socket, a four-hole flange socket, a round flange socket, or a straight inline pair for cable-to-cable joints, with right-angle versions of the larger shells. The plug and the panel socket are matched components: choose the panel cut-out first, then the plug body that mates with it.
What the listings publish
Ingress protection is IP68 on the sealed range, housings are PA66, and contacts are copper, gold-plated on the variants that state it. Rated current and voltage are printed per contact count rather than per family, so a quote is fixed against the exact variant you order.
Parts in this family

SP13-IN inline aviation connector — IP68

SP13-IN inline aviation connector — IP68

SP13-IN inline aviation connector — IP68

SP13-IN inline aviation connector — IP68

SP13-RA right-angle aviation connector — IP68

SP13-RA right-angle aviation connector — IP68

SP13-RN rear-nut aviation connector — IP68

SP13-RN rear-nut aviation connector — IP68

SP16-FL flange aviation connector — IP68

SP16-IN inline aviation connector — IP68

SP16-IN inline aviation connector — IP68

SP16-RN rear-nut aviation connector — IP68

SP16-STD straight aviation connector — IP68

SP17-IN inline aviation connector — IP68

SP17-RN rear-nut aviation connector — IP68

SP20-FL flange aviation connector — IP68

SP20-RA right-angle aviation connector — IP68

SP20-RN rear-nut aviation connector — IP68

SP20-SQ 4-hole flange aviation connector — IP68

SP21-FL flange aviation connector — IP68

SP21-IN inline aviation connector — IP68

SP21-RN rear-nut aviation connector — IP68

SP28-RA right-angle aviation connector — IP68

SP28-RA right-angle aviation connector — IP68

SP28-RA right-angle aviation connector — IP68

SP28-RN rear-nut aviation connector — IP68

SP28-SQ 4-hole flange aviation connector — IP68

SP28-STD straight aviation connector — IP68
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Open familyNeed a variant that is not listed?
Cable size, mount and current rating are the three things that change an ordering code. Send them with the model number and the closest variant can be confirmed.