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MODEL T31648
METAL SHRINKER/
STRETCHER SET
INSTRUCTIONS
For questions or help with this product contact Tech Support at (570) 546-9663 or techsupport@grizzly.com
Introduction
The Model T31648 Metal Shrinker/Stretcher Set
is a handy pair of tools for sheet metal fabricators
who need custom, curve-shaped metal straps,
trim, and flanges for auto body repair and general
sheet metal work.
Specifications
Max Thickness, Aluminum ...................16 Gauge
Max Thickness, Mild Steel
Max Thickness, Stainless Steel
Smallest Radius Bend
Jaw Depth......................................................... 1"
Bolt Pattern
Mounting Bolt Hole Size
...................................21/2" on Center
...................18 Gauge
.......... 20 Gauge
...................................... 3"
3
/8"-16.......................... 2
Inventory
Description Qty
A. Shrinker Body w/Dies ................................. 1
Stretcher Body w/Dies ................................ 1
B.
Levers ......................................................... 2
C.
Damage to your eyes and fingers could
result from using this item without proper
protective gear, such as safety glasses and
leather gloves. Be sure to use these items
for personal safety.
Assembly
The Shrinker/Stretcher Set comes from the factory almost completely assembled. To finalize
assembly, install one lever in each tool body (see
Figure 2) and secure with pre-installed M5-.8 x 8
set screws.
Tools Needed Qty
Hex Wrench 3mm .............................................. 1
A
C
Figure 1. Inventory.
NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
Set
Screw
B
C
Figure 2. Levers installed in shrinker and
stretcher.
COPYRIGHT © OCTOBER, 2019 BY GRIZZLY INDUSTRIAL, INC.
(FOR MODELS MFD. SINCE 10/19) #MN20682 PRINTED IN CHINA
Levers
Set
Screw
V1.10.19
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Mounting
The shrinker and stretcher are portable and can
be clamped in a vise for use. However, to take full
advantage of the set and to get 360° access to
your workpiece, you can mount these tools to a
stand intended for a bench grinder. To prevent tipping, be sure to fasten the grinder stand to the floor.
. Lay out die components, as shown in Figure 4.
3
Stretcher
To mount shrinker and stretcher:
. Clean and lubricate shrinker and stretcher as
1
outlined in Setup.
Determine where you want to mount the tools.
2
. At mounting location, center punch two points
3
1
/2" apart, and drill two 3/8" diameter holes at
2
these locations.
. Secure shrinker/stretcher to workbench or
4
grinder stand with two
3
/8"-16 bolts or cap
screws of appropriate length to ensure that
1
the fasteners thread into casting at least
/2".
Setup
1. Raise handle, loosen (4) knob bolts, unclip
die retainer from pressure arm, and slide die
assembly away from casting (see Figure 3).
Shrinker
Figure 4. Die and jaw assembly order.
4. Clean grease, metal shavings, and debris off
tool and dies, then lightly oil.
Note: Never use a wire wheel, buffer, sand
blaster, or sandpaper on jaw teeth. Otherwise,
tooth damage may occur. It is better to let
jaws soak in mineral spirits overnight, then
use a wire brush or a fine dental pick to
remove debris.
. Use Figures 4–5 as a guide to arrange die
5
parts in correct order and reassemble.
Knob
Bolts
Figure 3. Removing die retainer.
. Grasp die retainer clip and pull upper jaw
2
from die housing.
Note: Be careful not to lose any springs.
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ShrinkerStretcher
Figure 5. Assembled dies.
6. Shrinker/stretcher are ready for operation.
Model T31648 (Mfd. Since 10/19)
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When the tools are not in use or will be
placed in storage for a period of time, we
highly recommend removing the dies from
the tools. If the lever is accidently used
and the die jaws clamp down against one
another instead of a workpiece, the gripping
jaw teeth may be damaged.
Operation
The Model T31648 Shrinker/Stretcher Set is
designed to create long, compound-curved metal
pieces out of a single strip of metal without multiple splice points. Operation consists of inserting a
piece of metal in the tool and pulling down on the
lever to compress or expand the metal at various
points along the length of the metal strip, creating
the bend or shape needed.
During the bending process, as you work along
the strip of metal, the clamping pressure exerted
by the lever can be adjusted to create curves
with a nice smooth arch. The lever stop bolt (see
Figure 6) can be adjusted with a 14mm wrench to
allow the clamping lever to stop at the same location each time the lever is pulled down.
To use shrinker/stretcher:
. Verify jaw teeth are free of debris.
1
. Determine job requirements:
2
— Using the shrinker, a curve in the metal is
created by compressing the inside radius
of a curve (see Figure 7).
— Using the stretcher, a curve in the metal is
created by expanding the outside radius of
the curve (see Figure 8).
Note: Shrinking/stretching will create small
teeth marks from the jaws and cannot be
avoided. Limit depth of teeth marks by making
more, lighter pulls with the lever.
Compression
Area
Lever
Stop Bolt
Figure 6. Location of lever stop bolt.
Note: If metal splits during shrinking/stretching
procedure, it is typically because too much bend
is trying to be achieved with just a few heavy pulls
of the lever. To avoid splitting, make pulls lighter
and increase number of pulls on lever. If metal still
splits, radius of desired bend may be too small for
the metal, or the metal is of the incorrect type.
Figure 7. Shrinking a workpiece into a bend.
Stretching
Area
Figure 8. Stretching a workpiece into a bend.
Model T31648 (Mfd. Since 10/19)
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22
Please Note: We do our best to stock replacement parts whenever possible, but we cannot guarantee that all parts shown here
are available for purchase. Call (800) 523-4777 or visit our online parts store at www.grizzly.com to check for availability.
21
34
20
T31648 Parts Breakdown & List
7
8
9
1
2
3
38
4
32
31
19
39
Specifications
Max Thickness:
Aluminum: 16 Ga.
Mild Steel: 18 Ga.
Stainless Steel: 20 Ga.
Jaw Depth: 1"
Weight: 26 lbs.
Mfd. for Grizzly in China
T31648
Damage to your eyes and fingers
could result from using this item
without proper protective gear,
such as safety glasses and
leather gloves. Be sure to use
these items for personal safety.
T31648 METAL
SHRINKER/STRETCHER SET
WARNING!
To reduce risk of serious injury:
1. Read manual before using tool.
2. Wear eye protection during use.
3. Wear gloves during use.
4. Do not modify tool in any way.
5. Do not exceed rated capacity.
6. Mount tool to stable workbench.
37
36
35
14
15
16
17
18
6
5
10
33
13
12
11
25
26
15
27
23
24
23
24
28
29
30
REF PART # DES CRIP TION REF PART # DES CRIP TION
1 PT31648001 STRETCHER BODY (BLACK) 21 PT31648021 RETAI NER CLI P (S HRI NKER)
2 PT31648002 FULCRUM ARM PI N 22 PT31648022 DIE RETAI NER (S HRI NKER)
3 PT31648003 EXT RETA I NI NG RI NG 10MM 23 PT31648023 FLAT WA SHE R 4MM
4 PT31648004 EXT RETA I NI NG RI NG 12MM 24 PT31648024 PHLP HD SCR M4-.7 X 12
5 PT31648005 KNOB BOLT M5-.8 X 8, D12, ROUND KD 25 PT31648025 UPPER V-BLOCK (STRETCHER)
6 PT31648006 PRESSURE ARM PIN 26 PT31648026 UPPE R J AW (RI G HT, STRETCHER)
7 PT31648007 CLEVIS PIN 5 X 30 27 PT31648027 PHLP HD SCR M4-.7 X 30
8 PT31648008 PRESSURE ARM 28 PT31648028 LOWE R J AW (RI GHT, STRETCHER)
9 PT31648009 EXTENSION SPRING 29 PT31648029 LOWER J A W (LEFT, STRE TCHER)
10 PT31648010 HEX BOLT M8-1.25 X 35 30 PT31648030 LOWER V-BLOCK (STRETCHER)
11 PT31648011 SET SCREW M5-.8 X 8 31 PT31648031 DIE RETAI NER (S TRETCHE R)
12 PT31648012 FULCRUM ARM 32 PT31648032 RETAI NER CLI P (S TRETCHER)
13 PT31648013 LEVER 33 PT31648033 UPPE R J AW (LEFT, S TRETCHER)
14 PT31648014 UPPER V-BLOCK (SHRINKER) 34 PT31648034 SHRINKER BODY (GREEN)
15 PT31648015 COMPRESSION SPRING 35 PT31648035 MACHINE ID LABEL
16 PT31648016 UPPE R J AW (RI G HT, SHRINKER) 36 PT31648036 EYE/HAND WARNING LABEL
17 PT31648017 LOWE R J AW (RI GHT, SHRINKER) 37 PT31648037 QR CODE LABEL
18 PT31648018 LOWER V-BLOCK (SHRINKER) 38 PT31648038 TOUCH-UP PA I NT, GRI ZZLY GREEN
19 PT31648019 UPPE R J AW (LEFT, S HRI NKER) 39 PT31648039 TOUCH-UP PA I NT, GRI ZZLY BLACK
20 PT31648020 LOWE R J AW (LEFT, S HRI NKER)
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Model T31648 (Mfd. Since 10/19)
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