These blind fixing bolts are used in numerous aircraft, they are ordered by the part number followed by two numbers denoting the diameter in thirty-seconds of an inch and then two more numbers (represented by ** in the table) denoting the length in sixteenths of an inch.

For example: 2103-0606 is countersunk, 3/16” diameter and 3/8” long.

Hexagon Head Old AGS3817
Diameter	PH / FH No	Part Number	Price
3/16”	PH190	2101-0602	£4.10
		2101-0603	£4.10
		2101-0604	£4.10
		2101-0605	£4.10
		2101-0606	£4.10
		2101-0607	£4.10
		2101-0608	£4.10
		2101-0609	POA
		2101-0610	POA
		2101-0611	£6.00
		2101-0612	£4.10
		2101-0614	£5.13
		2101-0615	£4.10
		2101-0616	£7.18
1/4”	PH249	2101-0802	POA
		2101-0803	POA
		2101-0804	£4.10
		2101-0805	£4.10
		2101-0806	£4.10
		2101-0807	£4.10
		2101-0808	£4.10
		2101-0809	£4.10
		2101-0810	£4.10
		2101-0811	£4.10
		2101-0812	POA
		2101-0813	£4.10
		2101-0814	POA
		2101-0815	£6.00
5/16”	PH312	2101-1003	£5.50
		2101-1004	£5.50
		2101-1005	£5.50
		2101-1006	£5.50
		2101-1007	£5.50
		2101-1008	£5.50
		2101-1009	£5.50
		2101-1010	POA
		2101-1011	£6.00
		2101-1012	POA
		2101-1013	£6.00
		2101-1014	POA

Hexagon Head Old AGS3818
Diameter	PH / FH No	Part Number	Price
3/16”	100FH190	2103-0602	£4.10
		2103-0603	£4.10
		2103-0604	£4.10
		2103-0605	£4.10
		2103-0607	POA
		2103-0608	£4.10
		2103-0610	£4.10
		2103-0611	£4.10
		2103-0613	£4.10
1/4”	100FH249	2103-0802	£4.10
		2103-0803	£4.10
		2103-0804	£10.00
		2103-0807	£8.20
		2103-0808	£10.25
		2103-0809	£8.20
		2103-0810	£4.10
		2103-0812	£8.20
10/32”	100FH312	2103-1011	£3.08