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1/4 inch UNF Socket Head Cap Screws ASME B18. 3-2003 in Bright Zinc Plated (BZP) Steel

Also known as an Allen screw or Allen bolt, or simply a cap screw, socket head cap screws are a more modern alternative standard machine fastener to the standard hexagon headed bolt or setscrew, as found on much modern machinery. A hex key (otherwise known as an Allen key) is required to fit these fasteners. Conforming to ASME/ANSI B18.3, the contact surfaces of this screw or bolt are protected from external damage. Generally manufactured with a partial thread beyond a certain length and nominal diameter combination, but occasionally some stock may include a fully threaded shank at the same combination.
Image of UNF Socket Head Cap Screws ASME B18. 3-2003 in BZP image
technical drawing of UNF Socket Head Cap Screws ASME B18. 3-2003
Technical Summary
d nominal diameter 1/4
tpi threads per inch 28
b minimum thread length 1.0
dk head diameter 0.375
k max. maximum head height 0.250
t min. minimum recess depth 0.120
s drive size 3/16
Standard ASME B18.8
all dimensions in inches
Datasheet
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Description Sale Qtys Qty Price Breakdown Despatch Estimate
Socket Head Cap (Allen) Screw UNF 1/4 x 1/2 inch in Zinc Plated Steel
WF28977 - expected in 6 to 9 days
single screw for £1.87
or box of 30 for £14.32
or bulk of 150 for £58.36
£0.00  
Socket Head Cap (Allen) Screw UNF 1/4 x 5/8 inch in Zinc Plated Steel
WF28978 - 122 in stock
single screw for £1.97
or box of 30 for £15.09
or bulk of 150 for £61.17
£0.00  
Socket Head Cap (Allen) Screw UNF 1/4 x 3/4 inch in Zinc Plated Steel
WF28979 - 88 in stock
single screw for £2.53
or box of 30 for £21.75
or bulk of 150 for £84.97
£0.00  
Socket Head Cap (Allen) Screw UNF 1/4 x 1 inch in Zinc Plated Steel
WF28981 - 31 in stock
sachet of 2 for £3.53
or box of 80 for £54.19
or bulk of 400 for £240.09
£0.00  
Socket Cap (Allen) Screw UNF 1/4 x 1-1/4 inch in Zinc Plated Steel
WF28982 - 100 in stock
single screw for £2.81
or box of 20 for £19.61
or bulk of 100 for £77.29
£0.00  
Socket Cap (Allen) Screw UNF 1/4 x 1-1/2 inch in Zinc Plated Steel
WF28983 - 68 in stock
single screw for £3.12
or box of 15 for £19.03
or bulk of 75 for £75.18
£0.00  
Socket Head Cap (Allen) Screw UNF 1/4 x 2 inch in Zinc Plated Steel
WF28985 - 54 in stock
single screw for £3.35
or box of 15 for £22.21
or bulk of 75 for £86.61
£0.00  
single screw for £1.87
or box of 30 for £14.32
or bulk of 150 for £58.36
£0.00
 
single screw for £1.97
or box of 30 for £15.09
or bulk of 150 for £61.17
£0.00
 
single screw for £2.53
or box of 30 for £21.75
or bulk of 150 for £84.97
£0.00
 
sachet of 2 for £3.53
or box of 80 for £54.19
or bulk of 400 for £240.09
£0.00
 
single screw for £2.81
or box of 20 for £19.61
or bulk of 100 for £77.29
£0.00
 
single screw for £3.12
or box of 15 for £19.03
or bulk of 75 for £75.18
£0.00
 
single screw for £3.35
or box of 15 for £22.21
or bulk of 75 for £86.61
£0.00
 
Prices are subject to quantity discounts based on a sliding scale. Enter the desired quantity in the relevant box in the table above. This will automatically calculate a line price indicating the applicable rate for the quantities selected. All prices shown exclude VAT.
technical drawing of UNF Socket Head Cap Screws ASME B18. 3-2003
Technical Summary
d nominal diameter 1/4
tpi threads per inch 28
b minimum thread length 1.0
dk head diameter 0.375
k max. maximum head height 0.250
t min. minimum recess depth 0.120
s drive size 3/16
Standard ASME B18.8
all dimensions in inches
Datasheet
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