HI-LOK Fasteners

HI-LOK is a registered trademark of the Hi-Shear Corporation. The most current version of the drawings below can be found at https://www.lisi-aerospace.com/en/.    HI-LOK pins are commonly used in applications that require high tensile strength in extreme environments.  HI-LOKs pins and HI-LOK collars offer extremely precise dimensions making HI-LOK fasteners commonly used in space, military, and commercial aviation application. HI-LOK pins and HI-LOK collars are both threaded and require common installation tools making HI-LOK Fasteners easy to install and remove.

HI-LOK is a simple two-part fastener engineered to achieve in one all-purpose system the design features suiting many of today’s aerospace assembly needs. Consistent torque on each fastener installed is achieved through the integrated functions of the system working together. A carefully regulated breakoff groove in the self-locking HI-LOK collar provides uniform preload values by separating when the correct torque level is reached. This controlled preload of each HI-LOK^TM in the structure improves the fatigue life of the airframe significantly when compared to other fastening systems, including swaged collar type.

The HI-LOK^TM torqued the collar’s automatic breakoff design assures this and eliminates the need for torque inspection. As a highly efficient and dependable system.  

As a versatile fastener, HI-LOK^TM design does more with less, solving weighty problems and delivering high fatigue resistance without sacrificing strength. The lightweight HI-LOK^TM collar further contributes to weight-saving when compared to conventional nut and bolt systems of equal strength characteristics. Manufactured in a wide range of sizes and material combinations, in terms of versatility the HI-LOK^TM system offers engineering designers a ready solution to a variety of assembly problems.

Standard Configuration HI-LOKTM Pins*
Selection Guide
Minimum Shear Strength**	Material	Suggested Maximum Temperature (subject to finish)**	Head Style		Nominal size shank	1/64″ oversize shank	1/32″ oversize shank
95 Ksi	6Al-4V Titanium	750º F	Protruding Shear		HL10	HL110	HL410
			100º Reduced Flush Shear		HL11	HL111	HL411
			Protruding Tension		HL12 HL1012	HL112 HL1022	HL412 HL1032
			100º Flush MS24694 Tension		HL13 HL1013	HL113 HL1023	HL413 HL1033
95 Ksi	Alloy Steel	450ºF	Protruding Shear		HL18	HL62	HL218
			100º Reduced Flush Shear		HL19 HL34	HL63 HL35	HL219
			Protruding Tension		HL20	HL64	HL220
			100º Flush MS24694 Tension		HL21	HL65	HL221
95 Ksi	A-286 Hi- Temperature  Alloy	1200ºF	Protruding Shear		HL40	HL140	HL240
			100º Reduced Flush Shear		HL41	HL141	HL241
			Protruding Tension		HL48	HL248	HL748
			100º Flush MS24694 Tension		HL49	HL249	HL749
45Ksi	7075 – T6 Aluminum	250ºF	Protruding Shear		HL22	HL122	HL258
			100º Flush MS20426 Shear		HL23	HL123	HL259
125 Ksi	PH13-8Mo	600ºF	Protruding Shear		HL644	HL744	HL844
			100º Reduced Flush Shear		HL645	HL751	HL845
			Protruding Tension		HL 646	HL746	HL846
			100º Flush MS24694 Tension		HL 647	HL753	HL847
125 Ksi	Inconel 718	1200ºF	Protruding Shear		HL754	HL936	HL946
			100º Reduced Flush Shear		HL701	HL937	HL947
			Protruding Tension		HL 730
			100º Flush MS24694 Tension		HL731	HL939	HL949
* Refer to standards pages for recommended mating collars
** Shear strength at room temperature

Other HI-LOK Pins

HL 860

HI-LOK Collars

Standard and Forged Collar Selection Guide:

Collar Configuration	Application	Materials	For use with Nominal Size Shank HL Pins	For use with 1/64″ Oversize Shank HL Pins*	For use with 1/32″ Oversize Shank HL Pins*
Basic:	Shear	2024 Al.	HL70	HL79	HL84
		Stainless Steel	HL94 HL1094**	HL94 HL1094**	HL294
		A-286 CRES	HL97	HL1097**	HL197
		Titanium	HL379	HL379	HL491
	Tension	Stainless Steel	HL86	HL87 HL1087** HL1087A**	HL93
		A-286 CRES	HL78	HL278	HL478
		Titanium	HL198	HL198
		17-4PH CRES	HL73	HL273	HL373
Self-Aligning: for use on 7° max sloped surface	Shear	2024 Al.	HL82	HL82	HL382
		Stainless Steel	HL175	HL175	HL449
		A-286 CRES	HL185 HL297	HL185 HL297
	Tension	Stainless Steel	HL75	HL75	HL375
		A-286 CRES	HL275	HL275
		Titanium		HL280
		17-4PH CRES	HL89	HL89	HL289
Self-sealing:	Shear	2024 Al.	HL374 HL384 HL384A	HL374 HL384 HL384A

Notes: * Oversize collars may be used with lower size shank pins.

** indicates forged-type collar configuration.

HI-LOK collars are manufactured to the requirements of Hi-Shear Specification 345.

All Posted HI-LOK Collars

HL70	HL73	HL75	HL77	HL78	HL79	HL82	HL83	HL84	HL86
HL86FN	HL87	HL89	HL93	HL94	HL95	HL97	HL175	HL182	HL185
HL197	HL198	HL273	HL275	HL278	HL280	HL289	HL294	HL297	HL373
HL374	HL375	HL379	HL382	HL384	HL384A	HL478	HL491	HL570	HL582
HL584	HL585	HL586	HL587	HL593	HL1087	HL1087A	HL1094	HL1097	HL29

HL30	HL31	HL32	HL33	HL43	HL54	HL61	HL109	HL128	HL150
HL151	HL152	HL153	HL156	HL157	HL158	HL159	HL200	HL244	HL330
HL369	HL440	HL441	HL445	HL448	HL510	HL511	HL512	HL513	HL523
HL525	HL657	HL658	HL661	HL720	HL721	HL730	HL754	HL756	HL1034
HL1050	HL1051	HL1061	HLM18	HLM19	HLM32	HLM34	HLM35	HLM36	HLM37

HLM40	HLM48	HLM49	HLM910	HLM911	HLM912	HLM913	HL36	HL37	HL52
HL53	HL66	HL67	HL129	HL442	HL443	HL447	HL452	HL453	HL527
HL537	HL764	HL765	HL856	HL938	HL1052	HL1053	HL1063	HL1158	HL1159
HLM312	HLM313	HLM320	HLM321	HLM335	HLM336	HLM337	HLM348	HLM902	HLM903
HLM904	HLM905	HL820	HL821	HL823	HL851	HL853	HL946	HL948	HL1054

HL1057	HL1065	HL1258	HL1259	HLM610	HLM611	HLM612	HLM613	HLM620	HLM621
HLM636	HL58	HL59	HL136	HL137	HL240	HL255	HL257	HL454	HL455
HL458	HL459	HLM637	HLM641	HLM906	HLM908	HLM909	HL202	HL203	HL204
HL205	HL207	HL702	HL706	HL1056	HL1059	HL1067	HL1203	HL1205

HI-LOK Mechanical Lock Pins

HL227	HL233	HL252
HL349	HL358

HI-LOK Mechanical Lock Collars

HL584

HL585

Metric HI-LOK Pins

HLM10	HLM11	HLM12	HLM13
HLM20	HLM21	HLM29	HLM41
HLM310	HLM311	HLM341	HLM411
HLM419

Metric HI-LOK Collars

HLM70	HLM73	HLM75	HLM78
HLM80	HLM82	HLM86	HLM94
HLM175	HLM370	HLM394