Imperial Socket Cap Screw

Coarse Thread Fine Thread

Socket Cap Screws

1960 Series

Unified National Coarse

S310 - UNC Bare Steel

ANSI/ASME B18.3

1986

Socket Cap Screw Technical Drawing
#4" - 7/16" 1/2" - 1 1/2"
Diameter d #4-40 #6-32 #8-32 #10-24 1/4-20 5/16-18 3/8-16 7/16-14
Diameter Code 004 006 008 010 014 016 018 020
t min. .051 .064 .077 .090 .120 .151 .182 .213
s 3/32 7/64 9/64 5/32 3/16 1/4 5/16 3/8
.094 .109 .141 .156 .188 .250 .312 .375
k max. .112 .138 .164 .190 .250 .312 .375 .438
d1 max. .183 .226 .270 .312 .375 .469 .562 .656
Order Number -> 1/4 x 2-1/2 = S310-014-0250 (Diameter Code x Length Code)
Length Code Pkg.
1/4 0025 100 100 100 100     
5/16 0031 100  100      
3/8 0038 100 100 100 100 100 100   
1/2 0050 100 100 100 100 100 100 100 100
5/8 0063 100 100 100 100 100 100 100  
3/4 0075 100 100 100 100 100 100 100 100
7/8 0088   100 100 100 100 100  
1 0100 100 100 100 100 100 100 100 100
1-1/4 0125  100 100 100 100 100 100 100
1-1/2 0150  100 100 100 100 100 100 100
1-3/4 0175   100 100 100 100 100 100
2 0200  100 100 100 100 100 100 50
2-1/4 0225    100 100 100 50 50
2-1/2 0250    100 100 100 50 50
2-3/4 0275     100 100 50 50
3 0300    100 100 100 50 50
3-1/4 0325     100 100 50 50
3-1/2 0350    100 100 100 50 50
3-3/4 0375     100 100 50 50
4 0400    100 100 100 50 50
4-1/4 0425     100 100 50  
4-1/2 0450    100 100 100 50 25
4-3/4 0475     100 100 50  
5 0500     100 100 50 25
5-1/2 0550     100 100 50  
6 0600     100 100 25  
6-1/2 0650      100 25  
7 0700      100 25  
7-1/2 0750       25  
8 0800      100 25  

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Diameter d 1/2-13 5/8-11 3/4-10 7/8-9 1-8 1 1/4-7 1 1/2-6
Diameter Code 024 026 028 030 034 038 044
t min. .245 .307 3.70 .432 .495 .620 .745
s 3/8 ½ 5/8 3/4 3/4 7/8 1
.375 .500 .625 .750 .750 .875 1.000
k max. .500 .625 .750 .875 1 1.250 1.500
d1 max. .750 .938 1.125 1.312 1.5 1.875 2.250
Order Number -> 1/4 x 2-1/2 = S310-014-0250 (Diameter Code x Length Code)
Length Code Pkg.
1/2 0050 50       
5/8 0063 50       
3/4 0075 50       
7/8 0088 50       
1 0100 50 50 25     
1-1/4 0125 50 50 25     
1-1/2 0150 50 50 25 10 10   
1-3/4 0175 50 50 25 10    
2 0200 50 50 25 10 10   
2-1/4 0225 50 25 25 10 10   
2-1/2 0250 50 25 25 10 10 1  
2-3/4 0275 50 25 25 10 10   
3 0300 50 25 25 10 10 1  
3-1/4 0325 25 25 25 10 10   
3-1/2 0350 25 25 25 10 10 1 1
3-3/4 0375 25 25 25  10 1  
4 0400 25 25 25 10 10 1 1
4-1/4 0425 25 25 25  10   
4-1/2 0450 25 25 25 10 10 1 1
4-3/4 0475 25 25 25  10   
5 0500 25 25 25 10 10 1 1
5-1/2 0550 25 10 10 10 10 1 1
6 0600 25 10 10 10 10 1 1
6-1/2 0650 10 10 10 10 10 1 1
7 0700 10 10 10 10 10 1 1
7-1/2 0750 10 10 10  10   
8 0800 10 10 10 10 10 1 1
8-1/2 0850 1 1 1  1   
9 0900 1 1 1 1 1 1 1
9-1/2 0950 1 1 1  1   
10 1000 1 1 1 1 1 1 1
11 1100 1 1 1  1  1
12 1200 1 1 1  1 1 1
14 1400     1  1
16 1600       1

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Socket Cap Screws

1960 Series

Unified National Fine

S313 - UNF Bare Steel

ANSI/ASME B18.3

1986

Socket Cap Screw Technical Drawing
Diameter d #10-32 1/4-28 5/16-24 3/8-24 7/16-20 1/2-20 5/8-18 3/4-16 1-14
Diameter Code 010 014 016 018 020 024 026 028 034
t min. .090 .120 .151 .182 .213 .245 .307 3.70 .495
s 5/32 3/16 1/4 5/16 3/8 3/8 ½ 5/8 3/4
.156 .188 .250 .312 .375 .375 .500 .625 .750
k max. .190 .250 .312 .375 .438 .500 .625 .750 1
d1 max. .312 .375 .469 .562 .656 .750 .938 1.125 1.5
Order Number -> 1/4 x 2-1/2 = S313-014-0250 (Diameter Code x Length Code)
Length Code Pkg.
3/8 0038 100         
1/2 0050 100 100 100 100      
5/8 0063 100 100  100      
3/4 0075 100 100 100 100      
7/8 0088 100  100 100      
1 0100 100 100 100 100 100 50 50   
1-1/4 0125 100 100 100 100 100 50 50   
1-1/2 0150 100 100 100 100 100 50 50   
1-3/4 0175 100 100 100 100  50 50 25  
2 0200 100 100 100 100 50 50 50 25  
2-1/4 0225   100 50  50 25   
2-1/2 0250 100 100 100 50  50 25 25 25
2-3/4 0275    50   25   
3 0300  100 100 50 50 50 25 25  
3-1/2 0350  100 100 50  25 25 25  
4 0400  100 100 50  25 25 25  
4-1/2 0450      25  25  
5 0500      25  25  
6 0600      25    

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