Guard Wire Stud Terminal Dimensions

Swage studs are an excellent versatile option for terminating guard wires because they can accommodate a wide variety of end fittings:

  • Turnbuckles, also referred to as guardrail adjusters or rigging screws
  • Adjustable Forks
  • Lanyard Eyes, also referred to as guardrail eyes
  • Pelican Hooks

The bonus is that all these end fittings can be removed (unthreaded) for the wire to be passed through a yacht’s stanchion holes to facilitate installation and removal.

It is advisable to check the existing stanchion holes before ordering your new guard wires.

Use a set of digital vernier calipers to make the results easy to read and record.

For 4mm and 5mm guard wires the holes in the stanchions normally need to be a minimum 8mm clearance diameter.

8mm Clearance means large enough to allow an 8mm diameter fitting to pass through without getting stuck or meeting any resistance in the process.

A swage short stud is normally used in conjunction with a lanyard eye:

Swage Short Stud

A swage closed body stud is normally used in conjunction with an adjustable fork, a guardrail adjuster or other turnbuckle/rigging screw with a complete barrel (body). The adjustment is secured with a locking nut rather than a split pin:

Swage closed body stud

A swage open body stud is normally used in conjunction with a turnbuckle/rigging screw which has a barrel with the sides cut away so that you can see the threads.
The adjustment is secured with a split pin through the hole on the end of the stud.
Open body studs are more commonly used for standing rigging, but they may be the only option to meet your specific guard wire requirements if the specification is a little out of the ordinary:

Swage Open Body Stud

The dimensions in the tables below have been compiled by the Jimmy Green Rigging Team from the manufacturer specifications to determine the minimum clearance hole diameter required for each type of stud.

The table also includes the thread length for assessing the scope of adjustment.

Ø = diameter
MCSHR = Absolute Minimum Clearance Stanchion Hole Required

Short Swage Stud Terminal Dimensions for Sta-Lok and Petersen

Sta-Lok Short Stud
Sta-LokWire ØTerminal ØThreadThread DirectionThread LengthMCSHR
051-04-SH4mm7.4mm5/16" UNFRight Hand11.1mm8mm
051-04M8-SH4mm7.4mmM8Right Hand11.1mm8mm
051-05-SH5mm9.0mm5/16" UNFRight Hand11.1mm9.5mm
051-05M8-SH5mm9.0mmM8Right Hand11.1mm9.5mm
051-06-SH6mm12.4mm5/16" UNFRight Hand11.1mm13mm
051-06M8-SH6mm12.4mmM8Right Hand11.1mm13mm

Petersen Short Stud
PetersenWire ØTerminal ØThreadThread DirectionThread LengthMCSHR
GRS5/16X4L4mm7.5mm5/16" UNFLeft Handx8mm
GRS5/16X5L5mm9.1mm5/16" UNFLeft Handx9.5mm

Closed Body Stud Terminal Dimensions for Sta-Lok and Petersen

Sta-Lok Closed Body Stud
Sta-LokWire ØTerminal ØThreadThread DirectionThread LengthMCSHR
061-04-M6L4mm7.4mmM6Left Hand56mm8mm
061-04-M6R4mm7.4mmM6Right Hand56mm8mm
061-04-M8L4mm7.4mmM8Left Hand60mm8mm
061-04-M8R4mm7.4mmM8Right Hand60mm8mm
061-05-M8L5mm9.0mmM8Left Hand60mm9.5mm
061-05-M8R5mm9.0mmM8Right Hand60mm9.5mm
061-05-M10L5mm9.0mmM10Left Hand67mm9.5mm
061-05-M10R5mm9.0mmM10Right Hand67mm9.5mm
061-06-M10L6mm12.4mmM10Left Hand67mm13mm
061-06-M10R6mm12.4mmM10Right Hand67mm13mm
061-06-M12L6mm12.4mmM12Left Hand81mm13mm
061-06-M12R6mm12.4mmM12Right Hand81mm13mm

Petersen Closed Body Stud
PetersenWire ØTerminal ØThreadThread DirectionThread LengthMSHR
SC5/16x44mm7.5mm5/16" UNFRight Hand54mm8mm
SC5/16x55mm9.1mm5/16" UNFRight Hand54mm9.5mm
SC3/8x55mm9.1mm3/8" UNFRight Hand68mm9.5mm
SC3/8x66mm12.5mm3/8" UNFRight Hand68mm13mm
SC7/16x66mm12.5mm7/16" UNFRight Hand75mm13mm

Open Body Stud Terminal Dimensions for Sta-Lok and Petersen

** N.B. the thread length dimension includes the short extra part that accommodates the split pin hole

open body swage stud thread length explained

Sta-Lok Open Body Stud
Sta-LokWire ØTerminal ØThreadThread DirectionThread Length**MCSHR
051-04-1/44mm7.4mm1/4" UNFRight Hand56mm8mm
051-044mm7.4mm5/16" UNFRight Hand60mm8mm
051-05-5/165mm9.0mm5/16" UNFRight Hand60mm9.5mm
051-055mm9.0mm3/8" UNFRight Hand67mm9.5mm
051-06-3/86mm12.4mm3/8" UNFRight Hand67mm13mm
051-066mm12.4mm7/16" UNFRight Hand75mm13mm

Petersen Open Body Stud
PetersenWire ØTerminal ØThreadThread DirectionThread Length **MSHR
SO5/16x44mm7.5mm5/16" UNFRight Hand49mm8mm
SO5/16x55mm9.1mm5/16" UNFRight Hand49mm9.5mm
SO3/8x55mm9.1mm3/8" UNFRight Hand63mm9.5mm
SO3/8x66mm12.5mm3/8" UNFRight Hand63mm13mm
SO7/16x66mm12.5mm7/16" UNFRight Hand68mm13mm