11
Rev. 12/12
NOSE ASSEMBLIES:
Nose assemblies are not furnished with the tool and must be purchased separately. In ordering heads
be sure to specify the shank diameter and head style (universal or countersunk) of the rivets to be in-
stalled.
The following pulling heads will fit directly on the GB784 Riveter. (NOTE: Cherry
®
681 series pulling
heads fit directly on the GB784).
681 PULLING HEADS
FOR 2000 SERIES CHERRYLOCK RIVETS
CONFORMING TO NAS 1400 & NAS 1740
2.570
.780 Ø
A Ø
B
.600
RIVET
NOSE
DIAMETER ASSEMBLY
A
B
3/32"
3U-681-25
.188
.348
3/32"
3C-681-25
.163
.332
1/8"
4U-681-25
.250
.341
1/8"
4C-681-25
.208
.377
5/32"
5U-681-25
.313
.377
5/32"
5C-681-25
.269
.352
3/16"
6U-681-25
.375
.418
3/16"
6C-681-25
.335
.386
1/4"
8U-681-25
.500
.452
1/4"
8C-681-25
.458
.398
DIMENSION
INSTALLING 681 PULLING HEAD ON RIVETER
A
B
C
1. Remove knurled cap from front of riveter head.
2. Place jaw assembly (C) inside collet (B).
3. Insert spring end of jaw assembly into hole of head piston. Apply enough pressure to engage
collet threads. Turn until collet bottoms on shoulder of piston and collet lock snaps into slot in
piston. Hand tight is sufficient.
NOTE: To remove collet, push collet lock back into collet (using a blunt pointed tool) turning the
collet clockwise.
4. Place sleeve assembly (A) over collet and head piston. Slip knurled cap over the sleeve
assembly and hand tighten onto end of riveter head.
