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GB /T 4388 - 2008

Two-head Open-end Wrench

GB /T 4388 - 2008 双头呆扳手

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Dimensional Specifications — GB /T 4388 - 2008 (mm)

Size	P	k_max	s_max	s_min	k_nominal
4	5.5	99	7	4.5	89
5	7	111	8	4.5	99
7	10	135	13	7	120
8	12	159	14	7	134
(6)	10	135	11	6	120
(8)	12	151	13	7	134
3.2	4	87	5

Related Standards

GB /T 3390.1 - 2013— Hand Operated Socket Wrenches - Socket, Series 6.3 GB /T 3390.1 - 2013— Hand Operated Socket Wrenches - Socket, Series 10 GB /T 3390.1 - 2013— Hand Operated Socket Wrenches - Socket, Series 12.5 GB /T 3390.1 - 2013— Hand Operated Socket Wrenches - Socket, Series 20 GB /T 3390.1 - 2013— Hand Operated Socket Wrenches - Socket, Series 25 GB /T 14765 - 2008— Four-way Socket Wrenches GB /T 4388 - 2008— Two-head Box Wrenches GB /T 4388 - 2008— Deep-Offset Box Wrench

Technical Specifications & Availability

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Custom Specifications

Size	P	k_max	s_max	s_min	k_nominal
4	5.5	99	7	4.5	89
5	7	111	8	4.5	99
7	10	135	13	7	120
8	12	159	14	7	134
(6)	10	135	11	6	120
(8)	12	151	13	7	134
3.2	4	87	5

Size	P	k_max	s_max	s_min	k_nominal
4	5.5	99	7	4.5	89
5	7	111	8	4.5	99
7	10	135	13	7	120
8	12	159	14	7	134
(6)	10	135	11	6	120
(8)	12	151	13	7	134
3.2	4	87	5

Size	P	k_max	s_max	s_min	k_nominal
4	5.5	99	7	4.5	89
5	7	111	8	4.5	99
7	10	135	13	7	120
8	12	159	14	7	134
(6)	10	135	11	6	120
(8)	12	151	13	7	134
3.2	4	87	5