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Heyco® Lockit™ ST and RDD Strain
Relief Bushings

Table of UL Recognized Round Wire Types

Lockit™ Strain Reliefs for Round Cables

UL Approved for Cable Diameter Range UL Approved for Cable Diameter Range and UL Type
Mounting Hole
Diameter →
11,5 x 13,0 mm 17,5 x 17,5 mm .625" (15,9 mm) Ø Will Fit Electrical Knock-outs 1.250" (31,8 mm) Ø
.875" (22,2 mm) Ø 1.109" (28,2 mm) Ø
LOCKIT
Lockit
Variety
ST 101N ST 201N ST 301N RDD 101
RDD 101-7
RDD 101-90
RDD 201
RDD 201-2
RDD 201-90
RDD 301
RDD 301-2
RDD 301-90
RDD 401
RDD 401-2
RDD 501 RDD 601 RDD 701
UL DIA.
RANGE →
.220" - .290" .290" - .360" .355" - .420" .220" - .290"
5,6 - 7,4 mm
.290" - .385"
7,4 - 9,8 mm
.340" - .430"
8,6 - 10,9 mm
.420" - .450" .525" - .600" .600" - .700" .720" - .830"
UL Type
S X X X X X X X X X X
SE X X X X X X X X X X
SEO X X X X X X X X X X
SEOO                 X  
SEOOW X X X X X X X X X
SEOW X X X X X X X X X
SJ X X X X X X X X X
SJE X
SJEOOW X X X X X X X
SJEOW X X X X X X X
SJO X X X X X X X X X
SJOO X X X X X X X X X X
SJOOW X X X X X X X
SJOW X X X X X X X
SJT X X
SJTEOOW X X X X X X X
SJTEOW X X X X X X X
SJTO X X X X X X X X
SJTOO X X X X X X X X
SJTOOW X X X X X X X
SJTOW X X X X X X X
SJTW X X X X X X X
SO X X X X X X X X X X
SOO X X X X X X X X X X
SOOW X X X X X X X X
SOW X X X X X X X X
SRDT X
ST X
STO X X
STOO X X
STOOW X
STOW X
SV X X X X X X X X
SVE X X X X X X X X
SVEO X X X X X X X X
SVO X X X X X X X X
SVOO X X X X X X X X

Consult Heyco for UL Type designations not shown.
* UL approved for Cable Diameter Range.
** UL approved for Cable Diameter Range and Type.

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