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Terminals, Kits and Tools
Glossary of Product Terminology
Terminals
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Kits
Tools
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81
Terminals, Kits and Tools
F
or more than 30 years, 3M has been a leading supplier
of Scotchlok terminals, disconnects, connectors and tools for
use in the assembly and maintenance of electrical systems.
Thousands of satisfied customers know our products for:
• Effective and reliable performance, being UL Listed
and CSA Certified, where appropriate;
• A variety of types, sizes and materials meeting a broad
application range, including the demands of temperature
and weather;
• Design features assuring easy installation of 3M
products — positive and easy wire insertion,
elimination of strand hang-ups and wire twisting,
and easy insulation entry.
These are a few of the characteristics that make the
installer’s job easier.
?
Frequently Asked Questions
What does the insulation grip do?
The insulation grip provides a “second” crimp on the wire
insulation. It provides additional wire strain relief. It’s
excellent for high-vibration applications.
The handy reference guide on page 81 gives you
a variety of choices of tools to use with 3M terminals.
Insulated disconnects have barrel insulation only, and fully-
insulated disconnects are insulated from the barrel to the
receptacle/tab.
Non-insulated 3M terminals withstand temperatures up to
347°F (175°C). Insulated 3M terminals withstand
temperatures up to 221°F (105°C).
Which 3M tools can I use with
3M terminals?
What’s the difference between insulated
and fully-insulated disconnects?
What temperatures do 3M terminals
withstand?
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Phone 800/472 1
190 Fax 800/262 6329
Glossary of Product Terminology
Adapters
- To interconnect two connectors already attached
to wires.
Block Fork
- Designed to use in terminal block because
sides lie flat against barrier portion of terminal block.
Bullet Style
- Similar advantages as disconnects but are
rounded. Gives reliable in-line connection because parts
are made to have holding friction when joined. Usually
for automotive use.
Butt
- Uses chamfered barrel ends to provide fast, easy wire
insertion from both ends and a built-in wire stop for correct
positioning. Must be crimped at both ends.
Closed-End
- Used in situations requiring pigtail of two
or more wires.
Flanged Fork
- Gives the benefit of both the block and
locking forks. Stays secure should screw loosen. Has
tipped-up ends.
Fork
- Allows rapid connection of wire. Usually used
on free-standing studs.
Heavy-Duty
- Products of heavier than normal gauge
material. Commonly used by railroads.
Hook
- Combines the security of the ring with the
convenience of the forks.
Locking Fork
- The spring-like tongue locks in place
around the stud even when mount screw is not tightened.
Extra force is required to remove from stud.
Parallel
- Similar to butt with overlapped wires and single
crimp in center of connector. Used where space is limited.
Pins
- For installation in compression blocks. Used in
Europe for terminating stranded wire.
Quick Connect (Disconnect)
- Attached to mating part
by tongue of female part slipping over male tab. Use of
dents and rolled edges on female part provides excellent
holding force, while allowing easy and quick disconnect.
They are flat.
Ring
- The standard style of tongue; the safest and
most reliable. It cannot be removed unless mounting
screw is removed.
Tab
- Uses mounting hole for rivet or screw.
Tap
- No wire stripping is necessary; just lay wire
in connector and crimp. Connection is made.
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Standard Terminal Construction
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Barrel Styles
Non-insulated butted seam
The most economical terminal, it is
used where special performance or
installation characteristics are not
needed. Beveled mouth facilitates wire insertion.
Maximum temperature for bare terminals: 347°F (175°C).
Non-insulated brazed seam
Beveled mouth facilitates wire
insertion. Can be crimped anywhere
on barrel surface. Silver brazed seam
will not open under crimping pressure
or operating stresses. Unlike butted seam parts, stranded
wire cannot escape barrel confines during, or after, crimping.
Maximum temperature for bare terminals: 347°F (175°C).
Vinyl insulated brazed and butted seams
Used where insulated barrel
is necessary and desirable.
Terminal consists of brazed
or butted part with flared,
rigid molded polyvinyl
chloride sleeve, securely attached and funneled for easy wire
entry. Wire insulation positions itself against funnel portion
of vinyl sleeve, eliminating strand hang-up. Crimping barrel
and flared portion of sleeve provide excellent electrical
contact plus mechanical stress relief at junction of insulation
and barrel. Insulation has a non-slip ridge for ease of
positioning crimping tool.
Industry standard color coding indicates wire range.
Insulators are rated at a continuous operating temperature
range from -40°F to 221°F (-40°C to 105°C).
UL Listed and CSA Certified for 600V building wire
and 1,000V signs and lighting fixtures (luminaries).
Nylon insulated butted seam
with insulation grip
Used where insulated barrel
and positive insulation grip
are necessary or desirable.
Terminal consists of butted
seam part with flared, seamless brass sleeve securely
attached and covered with flared, molded nylon sleeve. Wire
insulation positions itself against funnel portion of brass
sleeve. Crimping barrel and flared portion of sleeve provide
excellent electrical contact plus mechanical stress relief at
junction of insulation and barrel. Positioning crimp tool is
nearly mistake proof due to a “step” in nylon insulation.
Industry standard color coding indicates wire range.
Insulators are rated at a continuous operating temperature
range from -40°F to 221°F (-40°C to 105°C).
UL Listed and CSA Certified for 600V building wire
and 1,000V signs and lighting fixtures (luminaries).
Terminals, Kits and Tools
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4
6
8
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3
Vinyl
Insulated
5
2
4
6
8
7
3
Nylon Insulated
with Insulation
Grip
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9
10
10
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3M Terminals provide a variety of design features assuring
consistently effective, reliable performance and easy
installation.
Please refer to the illustrations at the numbered locations
for the attributes described below.
1. One-piece, burr-free construction provides maximum
electrical conductivity. Electrical bright-tin plating gives
maximum corrosion resistance. Annealing relieves stress
points and assures maximum installed strength.
2. Barrel-to-pad transition design minimizes flexing
and bending.
3. Open-end design permits visual inspection of wire
location before and after crimping.
4. Maximum hold on wire comes from multiple “V”
grooves in #26-4 AWG parts, resulting in excellent
current flow.
5. Injection-molded insulations on terminals are the highest
quality in the industry.
• 221°F (105°C) rated, tough, resistant electrical
grade materials
• Molding ensures consistent wall thickness for
maximum reliability after crimping
• Molding allows funnel barrel construction for
easier installation
• Molding offers the crimp ridge and non-slip ridge
6. Crimp ridge designed for positive location of tool on
terminal barrel, resulting in few miscrimps.
7. Funnel barrel construction provides:
• Positive, easy wire insertion
• No hang-ups of wire strands
• Wire twisting not necessary
8. Nylon-insulated terminals, with grip, feature a brass
sleeve. Sleeve provides optimum grip on insulation,
strain relief and vibration protection. Brass sleeve is
recessed, which provides excellent flash-over protection.
9. Non-slip ridge so tool slides to correct position for a
proper crimp and better workmanship.
10.Beveled leading edge for easy wire insulation entry.
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Installation Procedure
Funnel Barrel Feature
provides an excellent electrical
and mechanical connection.
Phone 800/472 1
190 Fax 800/262 6329
• Funnel design guides wire into position.
tubing effectively resists abrasion, scoring, cut-through,
and the effects of long term aging.
Versatile and Easy to Use
– 3M heat shrink terminals,
splices and disconnects are available in wire sizes 22–10
AWG, and can be installed easily with a recommended tool
and heat source. The connectors are color-coded for wire
range identification, and the transparent tubing allows for
visual inspection.
• No wire strand hang-up as the wire is inserted, giving
a fast, positive installation.
High Temperature Terminals
and Connectors
3M high temperature terminals and connectors are
constructed of steel with a nickel plating. Their temperature
rating for continuous use at 900°F (482°C) makes them
perfect for use in ovens, motors, light fixtures and other
applications where other connectors would corrode or melt.
There is no applicable UL or CSA standard for high
temperature steel parts.
Application Procedure for
Heat Shrink Products:
1. Strip wires to appropriate
length as indicated on package
label.
2. Insert wire into terminal
and crimp with correct
station of a recommended tool.
3. Apply heat with a
recommended heat source.
• Wire is in place, ready for crimping.
For maximum crimping performance, barrel of connector
must be properly indexed in the crimp tool station.
Correct crimping is important
to assure a strong connection
Standard Crimp Terminal
and Connector Specifications
Electrical Crimp
Mechanical
Crimp
Insulated Terminals and
Connectors:
Non-Insulated Terminals
and Connectors:
Indent should be opposite
the barrel seam.
Correct
Incorrect
Materials
Crimp terminals and connectors are to be burr-free, annealed
and bright-tin plated ETP copper. Barrels shall be 0.25" long
with brazed seams where specified. Insulation grip sleeves
are to be tin-plated brass and attached securely to the barrel.
Terminal insulators are to be
molded
polyvinyl chloride or
nylon, UL Listed and CSA Certified for 600V in building
wire and 1,000V in signs and lighting fixtures (luminaries).
Connector insulators are to be
extruded
polyvinyl chloride
or nylon with a temperature rating of 221°F (105°C).
Construction
All insulated terminals are to have funnel entry construction
to prevent strand hang-up and a crimp ridge for proper tool
location. Nylon insulated terminals and connectors are to
have butted seam barrels with insulation grip sleeves. All
terminal barrels are to have multiple “V” grooves for
maximum conductor retention.
Length
“L”
Stud Size
Barrel I.D.
Heat Shrink Terminals, Connectors
and Disconnects
3M Heat Shrink pre-insulated terminals, connectors
and disconnects protect against the most challenging
of environments, making the best moisture protection
available. They offer several advantages over conventional
unsealed products.
Corrosion Resistance
– The adhesive-lined heat shrink
material, when properly crimped and shrunk, provides a seal
that is resistant to water, salt, steam and other related
contaminants.
Improved Mechanical Performance
– The adhesive-
lined heat shrink tubing adheres, when shrunk, to both the
connector and the wire insulation, providing improved
pullout strength and strain relief.
Durable Heat Shrink Tubing
– Tough heat shrink
Width
“W”
Clearance
“C”
Barrel
Length
“E”
Note:
All dimensions are measured in inches.
Maximum Insulation
Diameter
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3M
™
Terminal Numbering System
Terminal Numbering System
Features
Prefix
—
Terminal
Style
1
2
3
4
5
6
7
=
=
=
=
=
=
=
Ring Tongue
Flanged Fork
Fork or 3-Way
Hook or 4-Way
Flag Ring
Butt
Disconnect
or Closed End
Bullet Style
or Pin
Parallel
Ring Tongue
Tab
Disconnect
Flag
Multi-Stack
Wire Gauge
0 = #26–24 AWG,
Yellow
1 = #22–18 AWG,
Red
2 = #16–14 AWG,
Blue
3 = #12–10 AWG,
Yellow
4 = #8 AWG, Red
5 = #6 AWG, Blue
6 = #4 AWG,
Yellow
12 = #12–10, Yellow
16 = #16–14, Blue
18 = #18–10,
White
22 = #22–18, Red
or #22–14, White
23 = #16–12 AWG,
Yellow
or #14–12 AWG,
Red
0-3 = #16–14, 0.156
diameter
Additions
—
Stud
Size
0
2
4
6
8
10
14
26
38
56
58
75
500
610
716
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
#0
#2
#4
#6
#8
#10
#1/4"
#2, 4, 6
#3/8"
#5/16
#5/8"
#3/4"
#1/2"
#6, 8, 10
#7/16"
Pattern
S = Small
Diameter or
Blade Size
—
Terminal
Construction
No
Code = Butted
Seam
B = Insulation
Grip
L = Fully
Insulated
M = Moisture
Resistant
N = Nylon
Insulation
NS = Nylon
w/Steel
Sleeve
P = Vinyl
Insulated
S = Seamless
SN = Seamless
Nylon
SP = Seamless
Vinyl
W = Brazed
Seam
Terminals, Kits and Tools
BS = Block Fork
HT = High
Temperature
L = Long Neck
SS = Snap Fork
T = T-Tap
8 =
9 =
17 =
75 =
77 =
C = Locking
Clip
F = Female
FF = Double
Female
I = Interlock
Barrel
M = Male
MF = Male
Female
MM = Double
Male
O = Open
Barrel
SC = Semi-
Closed
WN = Brazed
Seam
Nylon
WP = Brazed
Seam
Vinyl
110-20 = 0.110 Blade
0.020 Stock
110-32 = 0.110 Blade
0.032 Stock
156 = 0.156 Bullet
Diameter
180 = 0.180 Bullet
Diameter
187-20 = 0.187 Blade
0.020 Stock
187-32 = 0.187 Blade
0.032 Stock
250-32 = 0.250 Blade
0.032 Stock
375-50 = 0.375 Blade
0.050 Stock
Map of Numbering System
Examples:
Catalog Number: BS-31-4S-W
Non-Insulated Brazed Seam Block Fork
Catalog Number: 71F-187-20-NBL
Nylon Insulated with Insulation Grip Female Disconnect
BS - 31 - 4S - W
Block Fork
Fork
Stud Size
Small
Brazed Seam
#22–18 AWG
72F - 187-20 - NBL
Disconnect
Female
Diameter
Nylon
Fully Insulated
#16–14 AWG
Insulation Grip
Insulator Color Coding
• Yellow (26-24 AWG)
• Red (22-18 AWG)
• Blue (16-14 AWG)
• Yellow (12-10 AWG)
• Red (8 AWG)
• Blue (6 AWG)
• Yellow (4 AWG)
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