DIN 7991 Flat Head Socket Screw

Socket Cap Screws

UNC/UNF

*Flat Head Countersunk

S325-UNC/UNF Bare Steel

ANSI/ASME B18.3
2003

 

Diameter - UNC #6-32#8-32#10-241/4-205/16-183/8-167/16-141/2-135/8-113/4-107/8-91-8
Diameter Code 006 008 010 014 016 018 020 024 026 028 030 034
t .066 .076 .087 .111 .135 .159 .159 .172 .220 .220 .248 .297
s 5/64 3/32 1/8 5/32 3/16 7/32 1/4 5/16 3/8 1/2 9/16 5/8
.078 .094 .125 .156 .188 .219 .250 .312 .375 .500 .562 .625
k max. .097 .112 .127 .161 .198 .234 .234 .251 .324 .396 .468 .540
d1 max. .307 .359 .411 .531 .656 .781 .844 .938 1.188 1.438 1.688 1.938
R.S. Torque (in-lb) 16.5 30.1 43.7 104 215 382 611 931 1722 3054 4928 7388
Length Code Pkg.
1/4 0025 100 100                    
5/16 0031     100                  
3/8 0038 100 100 100 100 100              
1/2 0050 100 100 100 100 100 100            
5/8 0063 100 100 100 100 100 100            
3/4 0075 100 100 100 100 100 100 100 100        
7/8 0088       100                
1 0100 100 100 100 100 100 100 100 100 50      
1-1/4 0125   100 100 100 100 100 100 100 50 25    
1-1/2 0150   100 100 100 100 100 100 100 50 25    
1-3/4 0175   100 100 100 100 100 100 50 50 25    
2 0200 100 100 100 100 100 100 50 50 50 25    
2-1/4 0225       100 100 100   50 25 25    
2-1/2 0250     100 100 100 100 50 50 25 25    
3 0300       100 100 100 50 50 25 25 25  
3-1/2 0350       100   100 50 50 25 25    
4 0400       100 100 100   50 25 25 25 10
4-1/2 0450           50   50 25 25    
5 0500           50   50 25 25   10
6 0600           50   50 25 25    
Diameter - UNF 10-321/4-285/16-243/8-241/2-20
Diameter Code 010 014 016 018 024
t .087 .111 .135 .159 .172
s 1/8 5/32 3/16 7/32 5/16
.125 .156 .188 .219 .312
k max. .127 .161 .198 .234 .251
d1 max. .411 .531 .656 .781 .938
R.S. Torque (in-lb) 43.7 104 215 382 931
Length Code Pkg.
1/4 0025 100        
3/8 0038 100 100      
1/2 0050 100 100 100    
5/8 0063 100 100 100    
3/4 0075 100 100 100 100 100
1 0100 100 100 100 100 100
1-1/4 0125 100 100 100 100 100
1-1/2 0150 100 100 100 100 100
1-3/4 0175 100 100 100    
2 0200 100 100   100 100
Order Number -> 1/4 x 2-1/2 UNC = S325-014-0250 (Diameter Code x Length Code)(Fine Thread add -F)