Holo-Krome Silicon Bronze Hex Cap Screws

Hex Cap Screws

Holo-Krome
Alloy 651, 655 or 661 Silicon Bronze

Unified National Round Coarse/Fine

H410 — UNRC Silicon Bronze

H420 — UNRF Silicon Bronze

ASME B18.2.1 Fully Threaded

UNRC
Diameter d		1/4-20	5/16-18	3/8-16	7/16-14	1/2-13	5/8-11	3/4-10
Diameter Code		014	016	018	020	024	026	028
S min.		0.428	0.489	0.551	0.612	0.736	0.922	1.1
max.		0.438	0.5	0.562	0.625	0.75	0.938	1.125
k min.		0.15	0.195	0.226	0.272	0.302	0.378	0.455
max.		0.163	0.211	0.243	0.291	0.323	0.403	0.483
Length	Code	* = Available upon request
3/8	0038	*
1/2	0050	*	*	*		*
5/8	0063	*	*	*		*
3/4	0075	*	*	*		*
7/8	0088	*	*	*
1	0100	*	*	*	*	*	*
1 1/4	0125	*	*	*	*	*	*
1 1/2	0150	*	*	*	*	*	*	*
1 3/4	0175	*	*	*		*	*
2	0200	*	*	*	*	*	*	*
2 1/4	0225		*	*		*	*	*
2 1/2	0250	*	*	*	*	*	*	*
2 3/4	0275		*	*		*	*	*
3	0300	*	*	*		*	*	*
3 1/4	0325			*		*	*
3 1/2	0350			*		*	*	*
3 3/4	0375			*		*	*	*
4	0400			*		*	*	*
4 1/2	0450			*		*	*	*
4 3/4	0475			*			*
5	0500			*		*	*	*
5 1/2	0550					*	*	*
6	0600			*		*	*
6 1/2	0650					*
7	0700					*
8	0800					*
8 1/2	0850					*
Order Number -> 1/4 x 2-1/2 = H410-014-0250 (Diameter Code x Length Code)

UNRF
Diameter d		5/16-24	3/8-24	1/2-20
Diameter Code		016	018	024
S min.		0.489	0.551	0.736
max.		0.5	0.562	0.75
k min.		0.195	0.226	0.302
max.		0.211	0.243	0.323
Length	Code	* = * = Available upon request
3/4	0075	*	*
7/8	0088		*
1 1/2	0150		*
2 3/4	0275		*
3	0300			*
Order Number -> 1/2 x 3 = H420-014-0300 (Diameter Code x Length Code)

Mechanical Requirements: Wedge tensile tested in accordance with ASTM F468 to 50,000 psi minimum.

Thread Requirements: ASME B1.1, UNC & UNF, Class 2A. Thread acceptance per 6.5.1.4 of ASTM F788.