Dimension Table for Base Holes: Studs, Nuts, and Screws | MachineMFG

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Dimension Table for Base Holes: Studs, Nuts, and Screws

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1. What Are Studs, Nuts, and Screws?

A stud refers to a type of fastener that has no head and is threaded at both ends, such as a double-end stud or a welding stud.

A nut, or a cap nut, is a part that is screwed together with a bolt or screw to serve a fastening function. It is an essential component in all manufacturing machinery. Depending on the material, it can be classified into several types like carbon steel, stainless steel, and non-ferrous metals (such as copper).

A screw, colloquially known as a bolt or screw bolt, usually does not require a nut and directly cooperates with two objects. The tool typically used is a screwdriver; the head often features a straight slot, cross slot, hexagon (internal and external), or plum blossom slot.

2. What Does the Term “Thread Bottom Hole Size” Refer To?

The size of the thread bottom hole refers to the diameter of the internal thread.

Generally, the bottom hole refers to the diameter of the pre-manufactured hole before the tap is used to thread the internal thread. This typically refers to the inner circular hole of the machined part, specifically the circular hole at the very bottom or surface.

During the threading process with a tap, the cutting edge primarily cuts the metal but also exerts pressure on it. This causes the metal to protrude and flow towards the tooth tip. Therefore, before threading, the drilled hole diameter (i.e., the bottom hole) should be larger than the inner diameter of the thread.

The diameter of the bottom hole can be found in the manual or calculated using the following empirical formulas:

  • For brittle materials (such as cast iron, bronze, etc.): Drill hole diameter d0 = d (thread outer diameter) – 1.1p (pitch)
  • For ductile materials (such as steel, copper, etc.): Drill hole diameter d0 = d (thread outer diameter) – p (pitch)

3. Dimension Table for Stud Base Holes

ModelSpecificationBase Hole Dimensions ϕ
B
BS
4404.25
6324.80
8325.45
O326.40
O4208.75
M34.25
M45.45
M56.40
M68.75
CHA
CHC
CFHA
CFHC
4404.40
6325.45
8327.40
O327.95
M34.40
M47.40
M57.95
CSS
CSOS
4405.45
6327.40
8327.95
O328.80
O4209.95
M35.45
M47.95
M58.80
M69.95
SO
SON
SOS
SOA
4404.25
64405.45
6325.45
86327.15
8327.15
O327.15
41164.25
61165.45
61435.45
81437.15
81697.15
81947.15
M34.25
3.5M35.45
M3.55.45
M47.25
M57.25
BSO
BSON
BSOS
BSOA
M34.25
3.5M35.45
M3.55.45
M47.25
M57.25
BSO
BSON
BSOS
BSOA
4404.25
64405.45
6325.45
86327.15
8327.15
O327.15
TSO
TSOS
TSOA
2564.25
62565.45
4404.25
64405.45
6325.45
M2.54.25
6M2.55.45
M34.25
6M35.45
M3.55.45
S
CLS
2564.25
3484.25
4404.25
6324.80
8325.45
SS
CLS
O246.40
O326.40
S
CLS
12247.10
O4208.80
KFE
KFSE
4404.25
6325.45
1164.25
1435.45
M34.25
3.65.45
4.26.40
KFB34404.25
6325.45
M34.25
M46.40
KFH4403.05
6323.60
8324.25
O324.80
M33.05
M44.25
M55.05
KSSBBase Hole A4.00
Base Hole B5.45
SOSG
SOAG
6440/M35.45
86327.15

4. Dimension Table for Nut Base Holes

ModelSpecificationBase Hole Dimensions
AS
AC
LAS
LAC
4407.40
6328.40
8329.40
O2410.35
O3210.35
O42013.10
O42813.10
M37.40
M49.40
M510.35
M613.10
KF2
KFS2
2563.80
4404.25
6325.45
8326.85
O326.95
M23.70
M2.54.20
M34.20
M46.40
M56.90
KPS64404.25
6325.45
8326.40
O326.95
M34.25
M46.40
M56.95
S
SS
CLS
CLSS
CS
2564.25
3484.25
4404.25
6324.80
8325.45
12247.10
O4208.80
O4288.80
O51810.55
O52410.55
O61612.75
O62412.75
O81316.70
O82016.70
M24.30
M2.54.30
M34.30
M3.54.80
M45.45
S
SS
CLS
CLSS
CS
M56.45
M68.80
M810.55
M1014.05
SP4404.25
6324.80
8325.45
O326.40
O4208.80
M34.25
M45.45
M56.40
M68.80
CLA2564.25
4404.80
6325.45
8326.00
O247.55
O327.55
O4208.80
M24.30
M34.80
M3.55.45
M46.05
M57.55
M68.80
NA
HNL
H
HN
O4208.85
O51810.60
O61612.80
M68.85
M810.60
M1012.80
CFN4403.90
M33.90
SLPS120-1723.05
F2564.40
4404.40
6325.45
8327.40
O327.95
O4208.75
M24.40
M2.54.40
M34.40
M47.40
M57.90
M68.75
SS
CLSS
O246.40
O326.40
U
UL
FEOX
FEO
FEX
FE
O802.85
1642.85
2563.70
4404.40
6325.45
8327.40
O327.40
O4208.75
O4288.75
M23.60
M34.40
M47.40
M57.40
M68.75
LK
LKS
LKA
2564.40
4404.80
6325.60
8326.80
O328.00
M2.54.40
M34.80
M46.80
M57.90
WN
WNS
4404.40
6324.95
8325.55
O246.40
O326.40
O4208.05
M34.40
M45.60
M56.40
M68.10
PL
PLC
4405.95
6326.70
8327.50
O327.90
M36.0
M47.5
M58.0

5. Dimension Table for Screw Base Holes

ModelSpecificationBase Hole Dimensions
f33.40
f44.20
FHL
FHLS
2562.20
4402.85
6323.50
8324.15
O324.85
M2.52.50
M33.00
M3.53.50
M44.00
M55.00
 HFH
HFHB
HFHS
O324.95
O4206.45
O5188.05
O6169.65
M55.10
M66.10
M88.10
M1010.10
FH44402.85
6323.55
8324.20
O324.85
M33.05
M44.05
M55.05
CHA
CHC
CFHA
CFHC
4404.35
6325.45
8327.40
O328.00
M34.40
M47.40
M58.00
FH
FHS
FHA
1674.90
2562.20
4402.85
6323.75
8324.20
O244.85
O324.85
O4206.40
O5187.95
M2.52.55
M33.05
M3.53.55
M44.05
M55.05
M66.05
M88.05
TFH
TFHS
2562.20
4402.85
6323.55
8324.20
O244.85
O324.85
M33.05
M44.05
M55.05
TPS1253.70
1875.25
2506.95
33.50
44.50
55.50
66.50
HFEO324.85
O4206.40
O5187.95
M55.00
M66.00
M88.00
PFHV4405.15
6325.60
M35.50
M3.56.00
M46.40
PFS2
PFC2
4406.75
6327.15
8327.95
O3210.35
O42011.90
M36.75
M47.95
M58.75
M610.50
PFC2P4406.75
6327.15
8327.95
O3210.35
O42011.90
M36.75
M47.95
M58.75
M610.50
PF30
PF31
PF32
4405.20
6325.60
8326.40
O327.95
O4209.55
M35.50
M46.40
M58.00
M69.50
PTL2-04Imperial8.35
Metric8.30
PFK4406.75
6327.15
M36.75
PF11
PF12
4405.60
6326.40
8327.95
O327.95
O4209.55
M35.60
M3.56.40
M47.95
M57.95
M69.55
CLR  6-326.50
M35.40
M4*.77.90

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