Nock guide
How the nock fits onto the string is very important. When you order a string you'll need to specify which nocks you are using so the center serving can be fit to them. If you are unsure which nocks you have, here's where you can figure that out.
They are organized by how they attach to your arrows. There are 4 main types:

Click each type above to learn more
Nocks by type
AAE IP4

Maker
AAE
Marks
None
Throat
0.111"
Slot
0.098"
Weight
7.38 gn
Insert
0.169"
Notes
Altra .204

Maker
Altra
Marks
None
Throat
.117
Slot
.085
Weight
8.68
Insert
.204
Notes
Bearpaw Slimline

Maker
Bearpaw
Marks
Bearpaw Logo
Throat
0.107"
Slot
0.098"
Weight
6.06 gn
Insert
0.175"
Notes
Beiter Insert #2

Maker
Beiter
Marks
Beiter, #/2
Throat
0.118"
Slot
0.098"
Weight
Insert
Notes
Asymmetrical
Black Eagle - M-ST

Maker
Black Eagle
Marks
None
Throat
0.093"
Slot
0.081"
Weight
5.74 gn
Insert
0.168"
Notes
Black Eagle - Std (old)

Maker
Black Eagle
Marks
None
Throat
0.120"
Slot
0.088"
Weight
10.06 gn
Insert
0.246"
Notes
Bohning F

Maker
Bohning
Marks
Bohning Logo
Throat
0.117"
Slot
0.096"
Weight
6.50 gn
Insert
0.166"
Notes
Carbon Express - Launchpad

Maker
Carbon Express
Marks
None
Throat
0.099"
Slot
0.074"
Weight
8.96 gn
Insert
0.235"
Notes
Easton 3D Super

Maker
Easton
Marks
None
Throat
0.112"
Slot
0.103"
Weight
11.78 gn
Insert
0.247"
Notes
Easton Microlite 4mm

Maker
Easton
Marks
None
Throat
0.107"
Slot
0.090"
Weight
5.80 gn
Insert
0.169"
Notes
Easton Super

Maker
Easton
Marks
Easton Logo
Throat
0.107"
Slot
0.081"
Weight
12.82 gn
Insert
0.248"
Notes
Gold Tip Accu-Lite

Maker
Gold Tip
Marks
Gold Tip Logo
Throat
0.112"
Slot
0.100"
Weight
8.74 gn
Insert
0.246"
Notes
QAD Tune-a-nock

Maker
QAD
Marks
F/S
Throat
0.116"
Slot
0.095"
Weight
5.60 gn
Insert
0.249"
Notes
Victory R

Maker
Victory
Marks
None
Throat
0.119"
Slot
0.110"
Weight
16.92 gn
Insert
0.205"
Notes
AAE IP5

Maker
AAE
Marks
None
Throat
0.113"
Slot
0.099"
Weight
8.18 gn
Insert
0.207"
Notes
Altra Std .246

Maker
Altra
Marks
None
Throat
.120
Slot
.090
Weight
10.28
Insert
.247
Notes
Bearpaw Speed

Maker
Bearpaw
Marks
Bearpaw Logo
Throat
0.117"
Slot
0.100"
Weight
12.00 gn
Insert
0.250"
Notes
Beiter Insert H

Maker
Beiter
Marks
Beiter, #, Hunter
Throat
0.117"
Slot
0.099"
Weight
Insert
Notes
Symmetrical
Black Eagle - R (new)

Maker
Black Eagle
Marks
None
Throat
0.114"
Slot
0.103"
Weight
7.12 gn
Insert
0.206"
Notes
Bohning A

Maker
Bohning
Marks
None
Throat
0.117"
Slot
0.095"
Weight
6.80 gn
Insert
0.204"
Notes
Bohning HE

Maker
Bohning
Marks
Bohning Logo
Throat
0.113"
Slot
0.090"
Weight
8.80 gn
Insert
0.230"
Notes
Carbon Impact Internal

Maker
Carbon Impact
Marks
None
Throat
0.097"
Slot
0.086"
Weight
5.20 gn
Insert
0.172"
Notes
Easton G - Large

Maker
Easton
Marks
None
Throat
0.110"
Slot
0.098"
Weight
6.86 gn
Insert
0.167"
Notes
Easton Microlite 6.5mm

Maker
Easton
Marks
None
Throat
0.110"
Slot
0.085"
Weight
7.88 gn
Insert
0.249"
Notes
Easton X

Maker
Easton
Marks
X
Throat
0.112"
Slot
0.097"
Weight
8.58 gn
Insert
0.208"
Notes
Gold Tip Accu-Tough

Maker
Gold Tip
Marks
Gold Tip Logo
Throat
0.115"
Slot
0.104"
Weight
11.22 gn
Insert
0.206"
Notes
Skylon G

Maker
Skylon
Marks
Skylon Chevron, G
Throat
0.093"
Slot
0.087"
Weight
5.76 gn
Insert
0.170"
Notes
Victory V

Maker
Victory
Marks
None
Throat
0.120"
Slot
0.108"
Weight
16.56 gn
Insert
0.205"
Notes
AAE IP6

Maker
AAE
Marks
None
Throat
0.111"
Slot
0.097"
Weight
9.94 gn
Insert
0.250"
Notes
Avalon G

Maker
Avalon
Marks
None
Throat
0.097"
Slot
0.091"
Weight
5.74 gn
Insert
0.168"
Notes
Copy of Easton G small
Beiter Insert #1

Maker
Beiter
Marks
Beiter
Throat
0.106"
Slot
0.088"
Weight
Insert
Notes
Asymmetrical
Black Eagle - M (new)

Maker
Black Eagle
Marks
None
Throat
0.114"
Slot
0.103"
Weight
6.16 gn
Insert
0.167"
Notes
Black Eagle - R (old)

Maker
Black Eagle
Marks
None
Throat
0.117"
Slot
0.084"
Weight
8.52 gn
Insert
0.208"
Notes
Bohning B (Signature)

Maker
Bohning
Marks
B (on both sides)
Throat
0.111"
Slot
0.103"
Weight
11.80 gn
Insert
0.245"
Notes
Bohning Smooth Release

Maker
Bohning
Marks
Bohning Logo
Throat
0.117"
Slot
0.094"
Weight
7.62 gn
Insert
0.250"
Notes
Cross-X 4.2 Uni L

Maker
Cross-X
Marks
None
Throat
0.111"
Slot
0.091"
Weight
5.84 gn
Insert
0.172"
Notes
Copy of Easton G large
Easton G - Small

Maker
Easton
Marks
None
Throat
0.098"
Slot
0.088"
Weight
6.54 gn
Insert
0.167"
Notes
Easton N

Maker
Easton
Marks
N
Throat
0.100"
Slot
0.081"
Weight
7.58 gn
Insert
0.168"
Notes
Essentials Tactical

Maker
Essentials
Marks
None
Throat
0.108"
Slot
0.100"
Weight
6.46 gn
Insert
0.244"
Notes
Gold Tip GT

Maker
Gold Tip
Marks
Gold Tip Logo
Throat
0.115"
Slot
0.101"
Weight
12.00 gn
Insert
0.242"
Notes
Skylon S

Maker
Skylon
Marks
Skylon Chevron, S
Throat
0.107"
Slot
0.097"
Weight
11.96 gn
Insert
0.248"
Notes
Altra .166

Maker
Altra
Marks
None
Throat
.111
Slot
.099
Weight
6.92
Insert
.166
Notes
Bearpaw Penthalon Hunter

Maker
Bearpaw
Marks
Bearpaw Logo
Throat
0.118"
Slot
0.105"
Weight
11.80 gn
Insert
0.240"
Notes
Beiter Insert #1H

Maker
Beiter
Marks
Beiter
Throat
0.104"
Slot
0.084"
Weight
Insert
Notes
Symmetrical
Black Eagle - M (old)

Maker
Black Eagle
Marks
None
Throat
0.111"
Slot
0.095"
Weight
6.8 gn
Insert
0.168"
Notes
Black Eagle - Std (new)

Maker
Black Eagle
Marks
None
Throat
0.115"
Slot
0.104"
Weight
7.70 gn
Insert
0.245"
Notes
Bohning Blazer

Maker
Bohning
Marks
Bohning Logo
Throat
0.118"
Slot
0.095"
Weight
8.64 gn
Insert
0.246"
Notes
Carbon Express - Amped

Maker
Carbon Express
Marks
CX
Throat
0.099"
Slot
0.075"
Weight
10.68 gn
Insert
0.244"
Notes
Cross-X 4.2 Uni S

Maker
Cross-X
Marks
None
Throat
0.098"
Slot
0.091"
Weight
5.66 gn
Insert
0.167"
Notes
Copy of Esston G small
Easton H

Maker
Easton
Marks
H
Throat
0.111"
Slot
0.096"
Weight
9.82 gn
Insert
0.229"
Notes
Easton S

Maker
Easton
Marks
S
Throat
0.112"
Slot
0.085"
Weight
13.14 gn
Insert
0.249"
Notes
Fivics In Nock

Maker
Fivics
Marks
None
Throat
0.098"
Slot
0.090"
Weight
5.66 gn
Insert
0.170"
Notes
Gold Tip GTO

Maker
Gold Tip
Marks
Gold Tip Logo
Throat
0.114"
Slot
0.102"
Weight
5.10 gn
Insert
0.166"
Notes
Skylon X

Maker
Skylon
Marks
Skylon Chevron, X
Throat
0.107"
Slot
0.097"
Weight
8.06 gn
Insert
0.208"
Notes